zig/lib/std / os/linux.zig

//! This file provides the system interface functions for Linux matching those
//! that are provided by libc, whether or not libc is linked. The following
//! abstractions are made:
//! * Work around kernel bugs and limitations. For example, see sendmmsg.
//! * Implement all the syscalls in the same way that libc functions will
//!   provide `rename` when only the `renameat` syscall exists.
//! * Does not support POSIX thread cancellation.
const std = @import("../std.zig");
const builtin = @import("builtin");
const assert = std.debug.assert;
const maxInt = std.math.maxInt;
const elf = std.elf;
const vdso = @import("linux/vdso.zig");
const dl = @import("../dynamic_library.zig");
const native_arch = builtin.cpu.arch;
const native_endian = native_arch.endian();
const is_mips = native_arch.isMIPS();
const is_ppc = native_arch.isPPC();
const is_ppc64 = native_arch.isPPC64();
const is_sparc = native_arch.isSPARC();
const iovec = std.os.iovec;
const iovec_const = std.os.iovec_const;

test {
    if (builtin.os.tag == .linux) {
        _ = @import("linux/test.zig");
    }

}

const syscall_bits = switch (native_arch) {
    .thumb => @import("linux/thumb.zig"),
    else => arch_bits,
};

const arch_bits = switch (native_arch) {
    .x86 => @import("linux/x86.zig"),
    .x86_64 => @import("linux/x86_64.zig"),
    .aarch64, .aarch64_be => @import("linux/arm64.zig"),
    .arm, .thumb => @import("linux/arm-eabi.zig"),
    .riscv64 => @import("linux/riscv64.zig"),
    .sparc64 => @import("linux/sparc64.zig"),
    .mips, .mipsel => @import("linux/mips.zig"),
    .mips64, .mips64el => @import("linux/mips64.zig"),
    .powerpc, .powerpcle => @import("linux/powerpc.zig"),
    .powerpc64, .powerpc64le => @import("linux/powerpc64.zig"),
    else => struct {},
};
pub const syscall0 = syscall_bits.syscall0;
pub const syscall1 = syscall_bits.syscall1;
pub const syscall2 = syscall_bits.syscall2;
pub const syscall3 = syscall_bits.syscall3;

pub const syscall4 = syscall_bits.syscall4;

pub const syscall5 = syscall_bits.syscall5;

pub const syscall6 = syscall_bits.syscall6;

pub const syscall7 = syscall_bits.syscall7;

pub const restore = syscall_bits.restore;

pub const restore_rt = syscall_bits.restore_rt;

pub const socketcall = syscall_bits.socketcall;

pub const syscall_pipe = syscall_bits.syscall_pipe;

pub const syscall_fork = syscall_bits.syscall_fork;

pub const ARCH = arch_bits.ARCH;

pub const Elf_Symndx = arch_bits.Elf_Symndx;

pub const F = arch_bits.F;

pub const Flock = arch_bits.Flock;

pub const HWCAP = arch_bits.HWCAP;

pub const LOCK = arch_bits.LOCK;

pub const MMAP2_UNIT = arch_bits.MMAP2_UNIT;

pub const REG = arch_bits.REG;

pub const SC = arch_bits.SC;

pub const Stat = arch_bits.Stat;

pub const VDSO = arch_bits.VDSO;

pub const blkcnt_t = arch_bits.blkcnt_t;

pub const blksize_t = arch_bits.blksize_t;

pub const clone = arch_bits.clone;

pub const dev_t = arch_bits.dev_t;

pub const ino_t = arch_bits.ino_t;

pub const mcontext_t = arch_bits.mcontext_t;

pub const mode_t = arch_bits.mode_t;

pub const msghdr = arch_bits.msghdr;

pub const msghdr_const = arch_bits.msghdr_const;

pub const nlink_t = arch_bits.nlink_t;

pub const off_t = arch_bits.off_t;

pub const time_t = arch_bits.time_t;

pub const timeval = arch_bits.timeval;

pub const timezone = arch_bits.timezone;

pub const ucontext_t = arch_bits.ucontext_t;

pub const user_desc = arch_bits.user_desc;

pub const getcontext = arch_bits.getcontext;

pub const tls = @import("linux/tls.zig");

pub const pie = @import("linux/start_pie.zig");

pub const BPF = @import("linux/bpf.zig");

pub const IOCTL = @import("linux/ioctl.zig");

pub const SECCOMP = @import("linux/seccomp.zig");

pub const syscalls = @import("linux/syscalls.zig");

pub const SYS = switch (@import("builtin").cpu.arch) {
    .x86 => syscalls.X86,
    .x86_64 => syscalls.X64,
    .aarch64, .aarch64_be => syscalls.Arm64,
    .arm, .thumb => syscalls.Arm,
    .riscv64 => syscalls.RiscV64,
    .sparc64 => syscalls.Sparc64,
    .mips, .mipsel => syscalls.Mips,
    .mips64, .mips64el => syscalls.Mips64,
    .powerpc, .powerpcle => syscalls.PowerPC,
    .powerpc64, .powerpc64le => syscalls.PowerPC64,
    else => @compileError("The Zig Standard Library is missing syscall definitions for the target CPU architecture"),
};

pub const MAP = struct {
    pub usingnamespace arch_bits.MAP;

    /// Share changes
    pub const SHARED = 0x01;
    /// Changes are private

    pub const PRIVATE = 0x02;
    /// share + validate extension flags

    pub const SHARED_VALIDATE = 0x03;
    /// Mask for type of mapping

    pub const TYPE = 0x0f;
    /// Interpret addr exactly

    pub const FIXED = 0x10;
    /// don't use a file

    pub const ANONYMOUS = if (is_mips) 0x800 else 0x20;
    // MAP_ 0x0100 - 0x4000 flags are per architecture
    /// populate (prefault) pagetables

    pub const POPULATE = if (is_mips) 0x10000 else 0x8000;
    /// do not block on IO

    pub const NONBLOCK = if (is_mips) 0x20000 else 0x10000;
    /// give out an address that is best suited for process/thread stacks

    pub const STACK = if (is_mips) 0x40000 else 0x20000;
    /// create a huge page mapping

    pub const HUGETLB = if (is_mips) 0x80000 else 0x40000;
    /// perform synchronous page faults for the mapping

    pub const SYNC = 0x80000;
    /// MAP_FIXED which doesn't unmap underlying mapping

    pub const FIXED_NOREPLACE = 0x100000;
    /// For anonymous mmap, memory could be uninitialized

    pub const UNINITIALIZED = 0x4000000;
};

pub const O = struct {
    pub usingnamespace arch_bits.O;

    pub const RDONLY = 0o0;

    pub const WRONLY = 0o1;

    pub const RDWR = 0o2;
};

pub usingnamespace @import("linux/io_uring.zig");

/// Set by startup code, used by `getauxval`.
pub var elf_aux_maybe: ?[*]std.elf.Auxv = null;

/// See `std.elf` for the constants.
pub fn getauxval(index: usize) usize {
    const auxv = elf_aux_maybe orelse return 0;
    var i: usize = 0;
    while (auxv[i].a_type != std.elf.AT_NULL) : (i += 1) {
        if (auxv[i].a_type == index)
            return auxv[i].a_un.a_val;
    }
    return 0;

}

// Some architectures (and some syscalls) require 64bit parameters to be passed
// in a even-aligned register pair.
const require_aligned_register_pair =
    builtin.cpu.arch.isPPC() or
    builtin.cpu.arch.isMIPS() or
    builtin.cpu.arch.isARM() or
    builtin.cpu.arch.isThumb();

// Split a 64bit value into a {LSB,MSB} pair.
// The LE/BE variants specify the endianness to assume.
fn splitValueLE64(val: i64) [2]u32 {
    const u: u64 = @bitCast(val);
    return [2]u32{
        @as(u32, @truncate(u)),
        @as(u32, @truncate(u >> 32)),
    };

}
fn splitValueBE64(val: i64) [2]u32 {
    const u: u64 = @bitCast(val);
    return [2]u32{
        @as(u32, @truncate(u >> 32)),
        @as(u32, @truncate(u)),
    };

}
fn splitValue64(val: i64) [2]u32 {
    const u: u64 = @bitCast(val);
    switch (native_endian) {
        .Little => return [2]u32{
            @as(u32, @truncate(u)),
            @as(u32, @truncate(u >> 32)),
        },
        .Big => return [2]u32{
            @as(u32, @truncate(u >> 32)),
            @as(u32, @truncate(u)),
        },
    }

}

/// Get the errno from a syscall return value, or 0 for no error.
pub fn getErrno(r: usize) E {
    const signed_r = @as(isize, @bitCast(r));
    const int = if (signed_r > -4096 and signed_r < 0) -signed_r else 0;
    return @as(E, @enumFromInt(int));

}

pub fn dup(old: i32) usize {
    return syscall1(.dup, @as(usize, @bitCast(@as(isize, old))));

}

pub fn dup2(old: i32, new: i32) usize {
    if (@hasField(SYS, "dup2")) {
        return syscall2(.dup2, @as(usize, @bitCast(@as(isize, old))), @as(usize, @bitCast(@as(isize, new))));
    } else {
        if (old == new) {
            if (std.debug.runtime_safety) {
                const rc = syscall2(.fcntl, @as(usize, @bitCast(@as(isize, old))), F.GETFD);
                if (@as(isize, @bitCast(rc)) < 0) return rc;
            }
            return @as(usize, @intCast(old));
        } else {
            return syscall3(.dup3, @as(usize, @bitCast(@as(isize, old))), @as(usize, @bitCast(@as(isize, new))), 0);
        }
    }

}

pub fn dup3(old: i32, new: i32, flags: u32) usize {
    return syscall3(.dup3, @as(usize, @bitCast(@as(isize, old))), @as(usize, @bitCast(@as(isize, new))), flags);

}

pub fn chdir(path: [*:0]const u8) usize {
    return syscall1(.chdir, @intFromPtr(path));

}

pub fn fchdir(fd: fd_t) usize {
    return syscall1(.fchdir, @as(usize, @bitCast(@as(isize, fd))));

}

pub fn chroot(path: [*:0]const u8) usize {
    return syscall1(.chroot, @intFromPtr(path));

}

pub fn execve(path: [*:0]const u8, argv: [*:null]const ?[*:0]const u8, envp: [*:null]const ?[*:0]const u8) usize {
    return syscall3(.execve, @intFromPtr(path), @intFromPtr(argv), @intFromPtr(envp));

}

pub fn fork() usize {
    if (comptime native_arch.isSPARC()) {
        return syscall_fork();
    } else if (@hasField(SYS, "fork")) {
        return syscall0(.fork);
    } else {
        return syscall2(.clone, SIG.CHLD, 0);
    }

}

/// This must be inline, and inline call the syscall function, because if the
/// child does a return it will clobber the parent's stack.
/// It is advised to avoid this function and use clone instead, because
/// the compiler is not aware of how vfork affects control flow and you may
/// see different results in optimized builds.
pub inline fn vfork() usize {
    return @call(.always_inline, syscall0, .{.vfork});

}

pub fn futimens(fd: i32, times: *const [2]timespec) usize {
    return utimensat(fd, null, times, 0);

}

pub fn utimensat(dirfd: i32, path: ?[*:0]const u8, times: *const [2]timespec, flags: u32) usize {
    return syscall4(.utimensat, @as(usize, @bitCast(@as(isize, dirfd))), @intFromPtr(path), @intFromPtr(times), flags);

}

pub fn fallocate(fd: i32, mode: i32, offset: i64, length: i64) usize {
    if (usize_bits < 64) {
        const offset_halves = splitValue64(offset);
        const length_halves = splitValue64(length);
        return syscall6(
            .fallocate,
            @as(usize, @bitCast(@as(isize, fd))),
            @as(usize, @bitCast(@as(isize, mode))),
            offset_halves[0],
            offset_halves[1],
            length_halves[0],
            length_halves[1],
        );
    } else {
        return syscall4(
            .fallocate,
            @as(usize, @bitCast(@as(isize, fd))),
            @as(usize, @bitCast(@as(isize, mode))),
            @as(u64, @bitCast(offset)),
            @as(u64, @bitCast(length)),
        );
    }

}

pub fn futex_wait(uaddr: *const i32, futex_op: u32, val: i32, timeout: ?*const timespec) usize {
    return syscall4(.futex, @intFromPtr(uaddr), futex_op, @as(u32, @bitCast(val)), @intFromPtr(timeout));

}

pub fn futex_wake(uaddr: *const i32, futex_op: u32, val: i32) usize {
    return syscall3(.futex, @intFromPtr(uaddr), futex_op, @as(u32, @bitCast(val)));

}

pub fn getcwd(buf: [*]u8, size: usize) usize {
    return syscall2(.getcwd, @intFromPtr(buf), size);

}

pub fn getdents(fd: i32, dirp: [*]u8, len: usize) usize {
    return syscall3(
        .getdents,
        @as(usize, @bitCast(@as(isize, fd))),
        @intFromPtr(dirp),
        @min(len, maxInt(c_int)),
    );

}

pub fn getdents64(fd: i32, dirp: [*]u8, len: usize) usize {
    return syscall3(
        .getdents64,
        @as(usize, @bitCast(@as(isize, fd))),
        @intFromPtr(dirp),
        @min(len, maxInt(c_int)),
    );

}

pub fn inotify_init1(flags: u32) usize {
    return syscall1(.inotify_init1, flags);

}

pub fn inotify_add_watch(fd: i32, pathname: [*:0]const u8, mask: u32) usize {
    return syscall3(.inotify_add_watch, @as(usize, @bitCast(@as(isize, fd))), @intFromPtr(pathname), mask);

}

pub fn inotify_rm_watch(fd: i32, wd: i32) usize {
    return syscall2(.inotify_rm_watch, @as(usize, @bitCast(@as(isize, fd))), @as(usize, @bitCast(@as(isize, wd))));

}

pub fn readlink(noalias path: [*:0]const u8, noalias buf_ptr: [*]u8, buf_len: usize) usize {
    if (@hasField(SYS, "readlink")) {
        return syscall3(.readlink, @intFromPtr(path), @intFromPtr(buf_ptr), buf_len);
    } else {
        return syscall4(.readlinkat, @as(usize, @bitCast(@as(isize, AT.FDCWD))), @intFromPtr(path), @intFromPtr(buf_ptr), buf_len);
    }

}

pub fn readlinkat(dirfd: i32, noalias path: [*:0]const u8, noalias buf_ptr: [*]u8, buf_len: usize) usize {
    return syscall4(.readlinkat, @as(usize, @bitCast(@as(isize, dirfd))), @intFromPtr(path), @intFromPtr(buf_ptr), buf_len);

}

pub fn mkdir(path: [*:0]const u8, mode: u32) usize {
    if (@hasField(SYS, "mkdir")) {
        return syscall2(.mkdir, @intFromPtr(path), mode);
    } else {
        return syscall3(.mkdirat, @as(usize, @bitCast(@as(isize, AT.FDCWD))), @intFromPtr(path), mode);
    }

}

pub fn mkdirat(dirfd: i32, path: [*:0]const u8, mode: u32) usize {
    return syscall3(.mkdirat, @as(usize, @bitCast(@as(isize, dirfd))), @intFromPtr(path), mode);

}

pub fn mknod(path: [*:0]const u8, mode: u32, dev: u32) usize {
    if (@hasField(SYS, "mknod")) {
        return syscall3(.mknod, @intFromPtr(path), mode, dev);
    } else {
        return mknodat(AT.FDCWD, path, mode, dev);
    }

}

pub fn mknodat(dirfd: i32, path: [*:0]const u8, mode: u32, dev: u32) usize {
    return syscall4(.mknodat, @as(usize, @bitCast(@as(isize, dirfd))), @intFromPtr(path), mode, dev);

}

pub fn mount(special: [*:0]const u8, dir: [*:0]const u8, fstype: ?[*:0]const u8, flags: u32, data: usize) usize {
    return syscall5(.mount, @intFromPtr(special), @intFromPtr(dir), @intFromPtr(fstype), flags, data);

}

pub fn umount(special: [*:0]const u8) usize {
    return syscall2(.umount2, @intFromPtr(special), 0);

}

pub fn umount2(special: [*:0]const u8, flags: u32) usize {
    return syscall2(.umount2, @intFromPtr(special), flags);

}

pub fn mmap(address: ?[*]u8, length: usize, prot: usize, flags: u32, fd: i32, offset: i64) usize {
    if (@hasField(SYS, "mmap2")) {
        // Make sure the offset is also specified in multiples of page size
        if ((offset & (MMAP2_UNIT - 1)) != 0)
            return @as(usize, @bitCast(-@as(isize, @intFromEnum(E.INVAL))));

        return syscall6(
            .mmap2,
            @intFromPtr(address),
            length,
            prot,
            flags,
            @as(usize, @bitCast(@as(isize, fd))),
            @as(usize, @truncate(@as(u64, @bitCast(offset)) / MMAP2_UNIT)),
        );
    } else {
        return syscall6(
            .mmap,
            @intFromPtr(address),
            length,
            prot,
            flags,
            @as(usize, @bitCast(@as(isize, fd))),
            @as(u64, @bitCast(offset)),
        );
    }

}

pub fn mprotect(address: [*]const u8, length: usize, protection: usize) usize {
    return syscall3(.mprotect, @intFromPtr(address), length, protection);

}

pub const MSF = struct {
    pub const ASYNC = 1;
    pub const INVALIDATE = 2;
    pub const SYNC = 4;
};

pub fn msync(address: [*]const u8, length: usize, flags: i32) usize {
    return syscall3(.msync, @intFromPtr(address), length, @as(u32, @bitCast(flags)));

}

pub fn munmap(address: [*]const u8, length: usize) usize {
    return syscall2(.munmap, @intFromPtr(address), length);

}

pub fn poll(fds: [*]pollfd, n: nfds_t, timeout: i32) usize {
    if (@hasField(SYS, "poll")) {
        return syscall3(.poll, @intFromPtr(fds), n, @as(u32, @bitCast(timeout)));
    } else {
        return syscall5(
            .ppoll,
            @intFromPtr(fds),
            n,
            @intFromPtr(if (timeout >= 0)
                &timespec{
                    .tv_sec = @divTrunc(timeout, 1000),
                    .tv_nsec = @rem(timeout, 1000) * 1000000,
                }
            else
                null),
            0,
            NSIG / 8,
        );
    }

}

pub fn ppoll(fds: [*]pollfd, n: nfds_t, timeout: ?*timespec, sigmask: ?*const sigset_t) usize {
    return syscall5(.ppoll, @intFromPtr(fds), n, @intFromPtr(timeout), @intFromPtr(sigmask), NSIG / 8);

}

pub fn read(fd: i32, buf: [*]u8, count: usize) usize {
    return syscall3(.read, @as(usize, @bitCast(@as(isize, fd))), @intFromPtr(buf), count);

}

pub fn preadv(fd: i32, iov: [*]const iovec, count: usize, offset: i64) usize {
    const offset_u: u64 = @bitCast(offset);
    return syscall5(
        .preadv,
        @as(usize, @bitCast(@as(isize, fd))),
        @intFromPtr(iov),
        count,
        // Kernel expects the offset is split into largest natural word-size.
        // See following link for detail:
        // https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=601cc11d054ae4b5e9b5babec3d8e4667a2cb9b5
        @as(usize, @truncate(offset_u)),
        if (usize_bits < 64) @as(usize, @truncate(offset_u >> 32)) else 0,
    );

}

pub fn preadv2(fd: i32, iov: [*]const iovec, count: usize, offset: i64, flags: kernel_rwf) usize {
    const offset_u: u64 = @bitCast(offset);
    return syscall6(
        .preadv2,
        @as(usize, @bitCast(@as(isize, fd))),
        @intFromPtr(iov),
        count,
        // See comments in preadv
        @as(usize, @truncate(offset_u)),
        if (usize_bits < 64) @as(usize, @truncate(offset_u >> 32)) else 0,
        flags,
    );

}

pub fn readv(fd: i32, iov: [*]const iovec, count: usize) usize {
    return syscall3(.readv, @as(usize, @bitCast(@as(isize, fd))), @intFromPtr(iov), count);

}

pub fn writev(fd: i32, iov: [*]const iovec_const, count: usize) usize {
    return syscall3(.writev, @as(usize, @bitCast(@as(isize, fd))), @intFromPtr(iov), count);

}

pub fn pwritev(fd: i32, iov: [*]const iovec_const, count: usize, offset: i64) usize {
    const offset_u: u64 = @bitCast(offset);
    return syscall5(
        .pwritev,
        @as(usize, @bitCast(@as(isize, fd))),
        @intFromPtr(iov),
        count,
        // See comments in preadv
        @as(usize, @truncate(offset_u)),
        if (usize_bits < 64) @as(usize, @truncate(offset_u >> 32)) else 0,
    );

}

pub fn pwritev2(fd: i32, iov: [*]const iovec_const, count: usize, offset: i64, flags: kernel_rwf) usize {
    const offset_u: u64 = @bitCast(offset);
    return syscall6(
        .pwritev2,
        @as(usize, @bitCast(@as(isize, fd))),
        @intFromPtr(iov),
        count,
        // See comments in preadv
        @as(usize, @truncate(offset_u)),
        if (usize_bits < 64) @as(usize, @truncate(offset_u >> 32)) else 0,
        flags,
    );

}

pub fn rmdir(path: [*:0]const u8) usize {
    if (@hasField(SYS, "rmdir")) {
        return syscall1(.rmdir, @intFromPtr(path));
    } else {
        return syscall3(.unlinkat, @as(usize, @bitCast(@as(isize, AT.FDCWD))), @intFromPtr(path), AT.REMOVEDIR);
    }

}

pub fn symlink(existing: [*:0]const u8, new: [*:0]const u8) usize {
    if (@hasField(SYS, "symlink")) {
        return syscall2(.symlink, @intFromPtr(existing), @intFromPtr(new));
    } else {
        return syscall3(.symlinkat, @intFromPtr(existing), @as(usize, @bitCast(@as(isize, AT.FDCWD))), @intFromPtr(new));
    }

}

pub fn symlinkat(existing: [*:0]const u8, newfd: i32, newpath: [*:0]const u8) usize {
    return syscall3(.symlinkat, @intFromPtr(existing), @as(usize, @bitCast(@as(isize, newfd))), @intFromPtr(newpath));

}

pub fn pread(fd: i32, buf: [*]u8, count: usize, offset: i64) usize {
    if (@hasField(SYS, "pread64") and usize_bits < 64) {
        const offset_halves = splitValue64(offset);
        if (require_aligned_register_pair) {
            return syscall6(
                .pread64,
                @as(usize, @bitCast(@as(isize, fd))),
                @intFromPtr(buf),
                count,
                0,
                offset_halves[0],
                offset_halves[1],
            );
        } else {
            return syscall5(
                .pread64,
                @as(usize, @bitCast(@as(isize, fd))),
                @intFromPtr(buf),
                count,
                offset_halves[0],
                offset_halves[1],
            );
        }
    } else {
        // Some architectures (eg. 64bit SPARC) pread is called pread64.
        const syscall_number = if (!@hasField(SYS, "pread") and @hasField(SYS, "pread64"))
            .pread64
        else
            .pread;
        return syscall4(
            syscall_number,
            @as(usize, @bitCast(@as(isize, fd))),
            @intFromPtr(buf),
            count,
            @as(u64, @bitCast(offset)),
        );
    }

}

pub fn access(path: [*:0]const u8, mode: u32) usize {
    if (@hasField(SYS, "access")) {
        return syscall2(.access, @intFromPtr(path), mode);
    } else {
        return syscall4(.faccessat, @as(usize, @bitCast(@as(isize, AT.FDCWD))), @intFromPtr(path), mode, 0);
    }

}

pub fn faccessat(dirfd: i32, path: [*:0]const u8, mode: u32, flags: u32) usize {
    return syscall4(.faccessat, @as(usize, @bitCast(@as(isize, dirfd))), @intFromPtr(path), mode, flags);

}

pub fn pipe(fd: *[2]i32) usize {
    if (comptime (native_arch.isMIPS() or native_arch.isSPARC())) {
        return syscall_pipe(fd);
    } else if (@hasField(SYS, "pipe")) {
        return syscall1(.pipe, @intFromPtr(fd));
    } else {
        return syscall2(.pipe2, @intFromPtr(fd), 0);
    }

}

pub fn pipe2(fd: *[2]i32, flags: u32) usize {
    return syscall2(.pipe2, @intFromPtr(fd), flags);

}

pub fn write(fd: i32, buf: [*]const u8, count: usize) usize {
    return syscall3(.write, @as(usize, @bitCast(@as(isize, fd))), @intFromPtr(buf), count);

}

pub fn ftruncate(fd: i32, length: i64) usize {
    if (@hasField(SYS, "ftruncate64") and usize_bits < 64) {
        const length_halves = splitValue64(length);
        if (require_aligned_register_pair) {
            return syscall4(
                .ftruncate64,
                @as(usize, @bitCast(@as(isize, fd))),
                0,
                length_halves[0],
                length_halves[1],
            );
        } else {
            return syscall3(
                .ftruncate64,
                @as(usize, @bitCast(@as(isize, fd))),
                length_halves[0],
                length_halves[1],
            );
        }
    } else {
        return syscall2(
            .ftruncate,
            @as(usize, @bitCast(@as(isize, fd))),
            @as(usize, @bitCast(length)),
        );
    }

}

pub fn pwrite(fd: i32, buf: [*]const u8, count: usize, offset: i64) usize {
    if (@hasField(SYS, "pwrite64") and usize_bits < 64) {
        const offset_halves = splitValue64(offset);

        if (require_aligned_register_pair) {
            return syscall6(
                .pwrite64,
                @as(usize, @bitCast(@as(isize, fd))),
                @intFromPtr(buf),
                count,
                0,
                offset_halves[0],
                offset_halves[1],
            );
        } else {
            return syscall5(
                .pwrite64,
                @as(usize, @bitCast(@as(isize, fd))),
                @intFromPtr(buf),
                count,
                offset_halves[0],
                offset_halves[1],
            );
        }
    } else {
        // Some architectures (eg. 64bit SPARC) pwrite is called pwrite64.
        const syscall_number = if (!@hasField(SYS, "pwrite") and @hasField(SYS, "pwrite64"))
            .pwrite64
        else
            .pwrite;
        return syscall4(
            syscall_number,
            @as(usize, @bitCast(@as(isize, fd))),
            @intFromPtr(buf),
            count,
            @as(u64, @bitCast(offset)),
        );
    }

}

pub fn rename(old: [*:0]const u8, new: [*:0]const u8) usize {
    if (@hasField(SYS, "rename")) {
        return syscall2(.rename, @intFromPtr(old), @intFromPtr(new));
    } else if (@hasField(SYS, "renameat")) {
        return syscall4(.renameat, @as(usize, @bitCast(@as(isize, AT.FDCWD))), @intFromPtr(old), @as(usize, @bitCast(@as(isize, AT.FDCWD))), @intFromPtr(new));
    } else {
        return syscall5(.renameat2, @as(usize, @bitCast(@as(isize, AT.FDCWD))), @intFromPtr(old), @as(usize, @bitCast(@as(isize, AT.FDCWD))), @intFromPtr(new), 0);
    }

}

pub fn renameat(oldfd: i32, oldpath: [*]const u8, newfd: i32, newpath: [*]const u8) usize {
    if (@hasField(SYS, "renameat")) {
        return syscall4(
            .renameat,
            @as(usize, @bitCast(@as(isize, oldfd))),
            @intFromPtr(oldpath),
            @as(usize, @bitCast(@as(isize, newfd))),
            @intFromPtr(newpath),
        );
    } else {
        return syscall5(
            .renameat2,
            @as(usize, @bitCast(@as(isize, oldfd))),
            @intFromPtr(oldpath),
            @as(usize, @bitCast(@as(isize, newfd))),
            @intFromPtr(newpath),
            0,
        );
    }

}

pub fn renameat2(oldfd: i32, oldpath: [*:0]const u8, newfd: i32, newpath: [*:0]const u8, flags: u32) usize {
    return syscall5(
        .renameat2,
        @as(usize, @bitCast(@as(isize, oldfd))),
        @intFromPtr(oldpath),
        @as(usize, @bitCast(@as(isize, newfd))),
        @intFromPtr(newpath),
        flags,
    );

}

pub fn open(path: [*:0]const u8, flags: u32, perm: mode_t) usize {
    if (@hasField(SYS, "open")) {
        return syscall3(.open, @intFromPtr(path), flags, perm);
    } else {
        return syscall4(
            .openat,
            @as(usize, @bitCast(@as(isize, AT.FDCWD))),
            @intFromPtr(path),
            flags,
            perm,
        );
    }

}

pub fn create(path: [*:0]const u8, perm: mode_t) usize {
    return syscall2(.creat, @intFromPtr(path), perm);

}

pub fn openat(dirfd: i32, path: [*:0]const u8, flags: u32, mode: mode_t) usize {
    // dirfd could be negative, for example AT.FDCWD is -100
    return syscall4(.openat, @as(usize, @bitCast(@as(isize, dirfd))), @intFromPtr(path), flags, mode);

}

/// See also `clone` (from the arch-specific include)
pub fn clone5(flags: usize, child_stack_ptr: usize, parent_tid: *i32, child_tid: *i32, newtls: usize) usize {
    return syscall5(.clone, flags, child_stack_ptr, @intFromPtr(parent_tid), @intFromPtr(child_tid), newtls);

}

/// See also `clone` (from the arch-specific include)
pub fn clone2(flags: u32, child_stack_ptr: usize) usize {
    return syscall2(.clone, flags, child_stack_ptr);

}

pub fn close(fd: i32) usize {
    return syscall1(.close, @as(usize, @bitCast(@as(isize, fd))));

}

pub fn fchmod(fd: i32, mode: mode_t) usize {
    return syscall2(.fchmod, @as(usize, @bitCast(@as(isize, fd))), mode);

}

pub fn chmod(path: [*:0]const u8, mode: mode_t) usize {
    if (@hasField(SYS, "chmod")) {
        return syscall2(.chmod, @intFromPtr(path), mode);
    } else {
        return syscall4(
            .fchmodat,
            @as(usize, @bitCast(@as(isize, AT.FDCWD))),
            @intFromPtr(path),
            mode,
            0,
        );
    }

}

pub fn fchown(fd: i32, owner: uid_t, group: gid_t) usize {
    if (@hasField(SYS, "fchown32")) {
        return syscall3(.fchown32, @as(usize, @bitCast(@as(isize, fd))), owner, group);
    } else {
        return syscall3(.fchown, @as(usize, @bitCast(@as(isize, fd))), owner, group);
    }

}

pub fn fchmodat(fd: i32, path: [*:0]const u8, mode: mode_t, flags: u32) usize {
    return syscall4(.fchmodat, @as(usize, @bitCast(@as(isize, fd))), @intFromPtr(path), mode, flags);

}

/// Can only be called on 32 bit systems. For 64 bit see `lseek`.
pub fn llseek(fd: i32, offset: u64, result: ?*u64, whence: usize) usize {
    // NOTE: The offset parameter splitting is independent from the target
    // endianness.
    return syscall5(
        ._llseek,
        @as(usize, @bitCast(@as(isize, fd))),
        @as(usize, @truncate(offset >> 32)),
        @as(usize, @truncate(offset)),
        @intFromPtr(result),
        whence,
    );

}

/// Can only be called on 64 bit systems. For 32 bit see `llseek`.
pub fn lseek(fd: i32, offset: i64, whence: usize) usize {
    return syscall3(.lseek, @as(usize, @bitCast(@as(isize, fd))), @as(usize, @bitCast(offset)), whence);

}

pub fn exit(status: i32) noreturn {
    _ = syscall1(.exit, @as(usize, @bitCast(@as(isize, status))));
    unreachable;

}

pub fn exit_group(status: i32) noreturn {
    _ = syscall1(.exit_group, @as(usize, @bitCast(@as(isize, status))));
    unreachable;

}

/// flags for the `reboot' system call.
pub const LINUX_REBOOT = struct {
    /// First magic value required to use _reboot() system call.
    pub const MAGIC1 = enum(u32) {
        MAGIC1 = 0xfee1dead,
        _,
    };

    /// Second magic value required to use _reboot() system call.
    pub const MAGIC2 = enum(u32) {
        MAGIC2 = 672274793,
        MAGIC2A = 85072278,
        MAGIC2B = 369367448,
        MAGIC2C = 537993216,
        _,
    };

    /// Commands accepted by the _reboot() system call.
    pub const CMD = enum(u32) {
        /// Restart system using default command and mode.
        RESTART = 0x01234567,

        /// Stop OS and give system control to ROM monitor, if any.
        HALT = 0xCDEF0123,

        /// Ctrl-Alt-Del sequence causes RESTART command.
        CAD_ON = 0x89ABCDEF,

        /// Ctrl-Alt-Del sequence sends SIGINT to init task.
        CAD_OFF = 0x00000000,

        /// Stop OS and remove all power from system, if possible.
        POWER_OFF = 0x4321FEDC,

        /// Restart system using given command string.
        RESTART2 = 0xA1B2C3D4,

        /// Suspend system using software suspend if compiled in.
        SW_SUSPEND = 0xD000FCE2,

        /// Restart system using a previously loaded Linux kernel
        KEXEC = 0x45584543,

        _,
    };
};

pub fn reboot(magic: LINUX_REBOOT.MAGIC1, magic2: LINUX_REBOOT.MAGIC2, cmd: LINUX_REBOOT.CMD, arg: ?*const anyopaque) usize {
    return std.os.linux.syscall4(
        .reboot,
        @intFromEnum(magic),
        @intFromEnum(magic2),
        @intFromEnum(cmd),
        @intFromPtr(arg),
    );

}

pub fn getrandom(buf: [*]u8, count: usize, flags: u32) usize {
    return syscall3(.getrandom, @intFromPtr(buf), count, flags);

}

pub fn kill(pid: pid_t, sig: i32) usize {
    return syscall2(.kill, @as(usize, @bitCast(@as(isize, pid))), @as(usize, @bitCast(@as(isize, sig))));

}

pub fn tkill(tid: pid_t, sig: i32) usize {
    return syscall2(.tkill, @as(usize, @bitCast(@as(isize, tid))), @as(usize, @bitCast(@as(isize, sig))));

}

pub fn tgkill(tgid: pid_t, tid: pid_t, sig: i32) usize {
    return syscall3(.tgkill, @as(usize, @bitCast(@as(isize, tgid))), @as(usize, @bitCast(@as(isize, tid))), @as(usize, @bitCast(@as(isize, sig))));

}

pub fn link(oldpath: [*:0]const u8, newpath: [*:0]const u8, flags: i32) usize {
    if (@hasField(SYS, "link")) {
        return syscall3(
            .link,
            @intFromPtr(oldpath),
            @intFromPtr(newpath),
            @as(usize, @bitCast(@as(isize, flags))),
        );
    } else {
        return syscall5(
            .linkat,
            @as(usize, @bitCast(@as(isize, AT.FDCWD))),
            @intFromPtr(oldpath),
            @as(usize, @bitCast(@as(isize, AT.FDCWD))),
            @intFromPtr(newpath),
            @as(usize, @bitCast(@as(isize, flags))),
        );
    }

}

pub fn linkat(oldfd: fd_t, oldpath: [*:0]const u8, newfd: fd_t, newpath: [*:0]const u8, flags: i32) usize {
    return syscall5(
        .linkat,
        @as(usize, @bitCast(@as(isize, oldfd))),
        @intFromPtr(oldpath),
        @as(usize, @bitCast(@as(isize, newfd))),
        @intFromPtr(newpath),
        @as(usize, @bitCast(@as(isize, flags))),
    );

}

pub fn unlink(path: [*:0]const u8) usize {
    if (@hasField(SYS, "unlink")) {
        return syscall1(.unlink, @intFromPtr(path));
    } else {
        return syscall3(.unlinkat, @as(usize, @bitCast(@as(isize, AT.FDCWD))), @intFromPtr(path), 0);
    }

}

pub fn unlinkat(dirfd: i32, path: [*:0]const u8, flags: u32) usize {
    return syscall3(.unlinkat, @as(usize, @bitCast(@as(isize, dirfd))), @intFromPtr(path), flags);

}

pub fn waitpid(pid: pid_t, status: *u32, flags: u32) usize {
    return syscall4(.wait4, @as(usize, @bitCast(@as(isize, pid))), @intFromPtr(status), flags, 0);

}

pub fn wait4(pid: pid_t, status: *u32, flags: u32, usage: ?*rusage) usize {
    return syscall4(
        .wait4,
        @as(usize, @bitCast(@as(isize, pid))),
        @intFromPtr(status),
        flags,
        @intFromPtr(usage),
    );

}

pub fn waitid(id_type: P, id: i32, infop: *siginfo_t, flags: u32) usize {
    return syscall5(.waitid, @intFromEnum(id_type), @as(usize, @bitCast(@as(isize, id))), @intFromPtr(infop), flags, 0);

}

pub fn fcntl(fd: fd_t, cmd: i32, arg: usize) usize {
    return syscall3(.fcntl, @as(usize, @bitCast(@as(isize, fd))), @as(usize, @bitCast(@as(isize, cmd))), arg);

}

pub fn flock(fd: fd_t, operation: i32) usize {
    return syscall2(.flock, @as(usize, @bitCast(@as(isize, fd))), @as(usize, @bitCast(@as(isize, operation))));

}

var vdso_clock_gettime = @as(?*const anyopaque, @ptrCast(&init_vdso_clock_gettime));

// We must follow the C calling convention when we call into the VDSO
const vdso_clock_gettime_ty = *align(1) const fn (i32, *timespec) callconv(.C) usize;

pub fn clock_gettime(clk_id: i32, tp: *timespec) usize {
    if (@hasDecl(VDSO, "CGT_SYM")) {
        const ptr = @atomicLoad(?*const anyopaque, &vdso_clock_gettime, .Unordered);
        if (ptr) |fn_ptr| {
            const f = @as(vdso_clock_gettime_ty, @ptrCast(fn_ptr));
            const rc = f(clk_id, tp);
            switch (rc) {
                0, @as(usize, @bitCast(-@as(isize, @intFromEnum(E.INVAL)))) => return rc,
                else => {},
            }
        }
    }
    return syscall2(.clock_gettime, @as(usize, @bitCast(@as(isize, clk_id))), @intFromPtr(tp));

}

fn init_vdso_clock_gettime(clk: i32, ts: *timespec) callconv(.C) usize {
    const ptr = @as(?*const anyopaque, @ptrFromInt(vdso.lookup(VDSO.CGT_VER, VDSO.CGT_SYM)));
    // Note that we may not have a VDSO at all, update the stub address anyway
    // so that clock_gettime will fall back on the good old (and slow) syscall
    @atomicStore(?*const anyopaque, &vdso_clock_gettime, ptr, .Monotonic);
    // Call into the VDSO if available
    if (ptr) |fn_ptr| {
        const f = @as(vdso_clock_gettime_ty, @ptrCast(fn_ptr));
        return f(clk, ts);
    }
    return @as(usize, @bitCast(-@as(isize, @intFromEnum(E.NOSYS))));

}

pub fn clock_getres(clk_id: i32, tp: *timespec) usize {
    return syscall2(.clock_getres, @as(usize, @bitCast(@as(isize, clk_id))), @intFromPtr(tp));

}

pub fn clock_settime(clk_id: i32, tp: *const timespec) usize {
    return syscall2(.clock_settime, @as(usize, @bitCast(@as(isize, clk_id))), @intFromPtr(tp));

}

pub fn gettimeofday(tv: *timeval, tz: *timezone) usize {
    return syscall2(.gettimeofday, @intFromPtr(tv), @intFromPtr(tz));

}

pub fn settimeofday(tv: *const timeval, tz: *const timezone) usize {
    return syscall2(.settimeofday, @intFromPtr(tv), @intFromPtr(tz));

}

pub fn nanosleep(req: *const timespec, rem: ?*timespec) usize {
    return syscall2(.nanosleep, @intFromPtr(req), @intFromPtr(rem));

}

pub fn setuid(uid: uid_t) usize {
    if (@hasField(SYS, "setuid32")) {
        return syscall1(.setuid32, uid);
    } else {
        return syscall1(.setuid, uid);
    }

}

pub fn setgid(gid: gid_t) usize {
    if (@hasField(SYS, "setgid32")) {
        return syscall1(.setgid32, gid);
    } else {
        return syscall1(.setgid, gid);
    }

}

pub fn setreuid(ruid: uid_t, euid: uid_t) usize {
    if (@hasField(SYS, "setreuid32")) {
        return syscall2(.setreuid32, ruid, euid);
    } else {
        return syscall2(.setreuid, ruid, euid);
    }

}

pub fn setregid(rgid: gid_t, egid: gid_t) usize {
    if (@hasField(SYS, "setregid32")) {
        return syscall2(.setregid32, rgid, egid);
    } else {
        return syscall2(.setregid, rgid, egid);
    }

}

pub fn getuid() uid_t {
    if (@hasField(SYS, "getuid32")) {
        return @as(uid_t, @intCast(syscall0(.getuid32)));
    } else {
        return @as(uid_t, @intCast(syscall0(.getuid)));
    }

}

pub fn getgid() gid_t {
    if (@hasField(SYS, "getgid32")) {
        return @as(gid_t, @intCast(syscall0(.getgid32)));
    } else {
        return @as(gid_t, @intCast(syscall0(.getgid)));
    }

}

pub fn geteuid() uid_t {
    if (@hasField(SYS, "geteuid32")) {
        return @as(uid_t, @intCast(syscall0(.geteuid32)));
    } else {
        return @as(uid_t, @intCast(syscall0(.geteuid)));
    }

}

pub fn getegid() gid_t {
    if (@hasField(SYS, "getegid32")) {
        return @as(gid_t, @intCast(syscall0(.getegid32)));
    } else {
        return @as(gid_t, @intCast(syscall0(.getegid)));
    }

}

pub fn seteuid(euid: uid_t) usize {
    // We use setresuid here instead of setreuid to ensure that the saved uid
    // is not changed. This is what musl and recent glibc versions do as well.
    //
    // The setresuid(2) man page says that if -1 is passed the corresponding
    // id will not be changed. Since uid_t is unsigned, this wraps around to the
    // max value in C.
    comptime assert(@typeInfo(uid_t) == .Int and @typeInfo(uid_t).Int.signedness == .unsigned);
    return setresuid(std.math.maxInt(uid_t), euid, std.math.maxInt(uid_t));

}

pub fn setegid(egid: gid_t) usize {
    // We use setresgid here instead of setregid to ensure that the saved uid
    // is not changed. This is what musl and recent glibc versions do as well.
    //
    // The setresgid(2) man page says that if -1 is passed the corresponding
    // id will not be changed. Since gid_t is unsigned, this wraps around to the
    // max value in C.
    comptime assert(@typeInfo(uid_t) == .Int and @typeInfo(uid_t).Int.signedness == .unsigned);
    return setresgid(std.math.maxInt(gid_t), egid, std.math.maxInt(gid_t));

}

pub fn getresuid(ruid: *uid_t, euid: *uid_t, suid: *uid_t) usize {
    if (@hasField(SYS, "getresuid32")) {
        return syscall3(.getresuid32, @intFromPtr(ruid), @intFromPtr(euid), @intFromPtr(suid));
    } else {
        return syscall3(.getresuid, @intFromPtr(ruid), @intFromPtr(euid), @intFromPtr(suid));
    }

}

pub fn getresgid(rgid: *gid_t, egid: *gid_t, sgid: *gid_t) usize {
    if (@hasField(SYS, "getresgid32")) {
        return syscall3(.getresgid32, @intFromPtr(rgid), @intFromPtr(egid), @intFromPtr(sgid));
    } else {
        return syscall3(.getresgid, @intFromPtr(rgid), @intFromPtr(egid), @intFromPtr(sgid));
    }

}

pub fn setresuid(ruid: uid_t, euid: uid_t, suid: uid_t) usize {
    if (@hasField(SYS, "setresuid32")) {
        return syscall3(.setresuid32, ruid, euid, suid);
    } else {
        return syscall3(.setresuid, ruid, euid, suid);
    }

}

pub fn setresgid(rgid: gid_t, egid: gid_t, sgid: gid_t) usize {
    if (@hasField(SYS, "setresgid32")) {
        return syscall3(.setresgid32, rgid, egid, sgid);
    } else {
        return syscall3(.setresgid, rgid, egid, sgid);
    }

}

pub fn getgroups(size: usize, list: *gid_t) usize {
    if (@hasField(SYS, "getgroups32")) {
        return syscall2(.getgroups32, size, @intFromPtr(list));
    } else {
        return syscall2(.getgroups, size, @intFromPtr(list));
    }

}

pub fn setgroups(size: usize, list: [*]const gid_t) usize {
    if (@hasField(SYS, "setgroups32")) {
        return syscall2(.setgroups32, size, @intFromPtr(list));
    } else {
        return syscall2(.setgroups, size, @intFromPtr(list));
    }

}

pub fn getpid() pid_t {
    return @as(pid_t, @bitCast(@as(u32, @truncate(syscall0(.getpid)))));

}

pub fn gettid() pid_t {
    return @as(pid_t, @bitCast(@as(u32, @truncate(syscall0(.gettid)))));

}

pub fn sigprocmask(flags: u32, noalias set: ?*const sigset_t, noalias oldset: ?*sigset_t) usize {
    return syscall4(.rt_sigprocmask, flags, @intFromPtr(set), @intFromPtr(oldset), NSIG / 8);

}

pub fn sigaction(sig: u6, noalias act: ?*const Sigaction, noalias oact: ?*Sigaction) usize {
    assert(sig >= 1);
    assert(sig != SIG.KILL);
    assert(sig != SIG.STOP);

    var ksa: k_sigaction = undefined;
    var oldksa: k_sigaction = undefined;
    const mask_size = @sizeOf(@TypeOf(ksa.mask));

    if (act) |new| {
        const restorer_fn = if ((new.flags & SA.SIGINFO) != 0) &restore_rt else &restore;
        ksa = k_sigaction{
            .handler = new.handler.handler,
            .flags = new.flags | SA.RESTORER,
            .mask = undefined,
            .restorer = @ptrCast(restorer_fn),
        };
        @memcpy(@as([*]u8, @ptrCast(&ksa.mask))[0..mask_size], @as([*]const u8, @ptrCast(&new.mask)));
    }

    const ksa_arg = if (act != null) @intFromPtr(&ksa) else 0;
    const oldksa_arg = if (oact != null) @intFromPtr(&oldksa) else 0;

    const result = switch (native_arch) {
        // The sparc version of rt_sigaction needs the restorer function to be passed as an argument too.
        .sparc, .sparc64 => syscall5(.rt_sigaction, sig, ksa_arg, oldksa_arg, @intFromPtr(ksa.restorer), mask_size),
        else => syscall4(.rt_sigaction, sig, ksa_arg, oldksa_arg, mask_size),
    };
    if (getErrno(result) != .SUCCESS) return result;

    if (oact) |old| {
        old.handler.handler = oldksa.handler;
        old.flags = @as(c_uint, @truncate(oldksa.flags));
        @memcpy(@as([*]u8, @ptrCast(&old.mask))[0..mask_size], @as([*]const u8, @ptrCast(&oldksa.mask)));
    }

    return 0;

}

const usize_bits = @typeInfo(usize).Int.bits;

pub fn sigaddset(set: *sigset_t, sig: u6) void {
    const s = sig - 1;
    // shift in musl: s&8*sizeof *set->__bits-1
    const shift = @as(u5, @intCast(s & (usize_bits - 1)));
    const val = @as(u32, @intCast(1)) << shift;
    (set.*)[@as(usize, @intCast(s)) / usize_bits] |= val;

}

pub fn sigismember(set: *const sigset_t, sig: u6) bool {
    const s = sig - 1;
    return ((set.*)[@as(usize, @intCast(s)) / usize_bits] & (@as(usize, @intCast(1)) << (s & (usize_bits - 1)))) != 0;

}

pub fn getsockname(fd: i32, noalias addr: *sockaddr, noalias len: *socklen_t) usize {
    if (native_arch == .x86) {
        return socketcall(SC.getsockname, &[3]usize{ @as(usize, @bitCast(@as(isize, fd))), @intFromPtr(addr), @intFromPtr(len) });
    }
    return syscall3(.getsockname, @as(usize, @bitCast(@as(isize, fd))), @intFromPtr(addr), @intFromPtr(len));

}

pub fn getpeername(fd: i32, noalias addr: *sockaddr, noalias len: *socklen_t) usize {
    if (native_arch == .x86) {
        return socketcall(SC.getpeername, &[3]usize{ @as(usize, @bitCast(@as(isize, fd))), @intFromPtr(addr), @intFromPtr(len) });
    }
    return syscall3(.getpeername, @as(usize, @bitCast(@as(isize, fd))), @intFromPtr(addr), @intFromPtr(len));

}

pub fn socket(domain: u32, socket_type: u32, protocol: u32) usize {
    if (native_arch == .x86) {
        return socketcall(SC.socket, &[3]usize{ domain, socket_type, protocol });
    }
    return syscall3(.socket, domain, socket_type, protocol);

}

pub fn setsockopt(fd: i32, level: u32, optname: u32, optval: [*]const u8, optlen: socklen_t) usize {
    if (native_arch == .x86) {
        return socketcall(SC.setsockopt, &[5]usize{ @as(usize, @bitCast(@as(isize, fd))), level, optname, @intFromPtr(optval), @as(usize, @intCast(optlen)) });
    }
    return syscall5(.setsockopt, @as(usize, @bitCast(@as(isize, fd))), level, optname, @intFromPtr(optval), @as(usize, @intCast(optlen)));

}

pub fn getsockopt(fd: i32, level: u32, optname: u32, noalias optval: [*]u8, noalias optlen: *socklen_t) usize {
    if (native_arch == .x86) {
        return socketcall(SC.getsockopt, &[5]usize{ @as(usize, @bitCast(@as(isize, fd))), level, optname, @intFromPtr(optval), @intFromPtr(optlen) });
    }
    return syscall5(.getsockopt, @as(usize, @bitCast(@as(isize, fd))), level, optname, @intFromPtr(optval), @intFromPtr(optlen));

}

pub fn sendmsg(fd: i32, msg: *const msghdr_const, flags: u32) usize {
    const fd_usize = @as(usize, @bitCast(@as(isize, fd)));
    const msg_usize = @intFromPtr(msg);
    if (native_arch == .x86) {
        return socketcall(SC.sendmsg, &[3]usize{ fd_usize, msg_usize, flags });
    } else {
        return syscall3(.sendmsg, fd_usize, msg_usize, flags);
    }

}

pub fn sendmmsg(fd: i32, msgvec: [*]mmsghdr_const, vlen: u32, flags: u32) usize {
    if (@typeInfo(usize).Int.bits > @typeInfo(@typeInfo(mmsghdr).Struct.fields[1].type).Int.bits) {
        // workaround kernel brokenness:
        // if adding up all iov_len overflows a i32 then split into multiple calls
        // see https://www.openwall.com/lists/musl/2014/06/07/5
        const kvlen = if (vlen > IOV_MAX) IOV_MAX else vlen; // matches kernel
        var next_unsent: usize = 0;
        for (msgvec[0..kvlen], 0..) |*msg, i| {
            var size: i32 = 0;
            const msg_iovlen = @as(usize, @intCast(msg.msg_hdr.msg_iovlen)); // kernel side this is treated as unsigned
            for (msg.msg_hdr.msg_iov[0..msg_iovlen]) |iov| {
                if (iov.iov_len > std.math.maxInt(i32) or @addWithOverflow(size, @as(i32, @intCast(iov.iov_len)))[1] != 0) {
                    // batch-send all messages up to the current message
                    if (next_unsent < i) {
                        const batch_size = i - next_unsent;
                        const r = syscall4(.sendmmsg, @as(usize, @bitCast(@as(isize, fd))), @intFromPtr(&msgvec[next_unsent]), batch_size, flags);
                        if (getErrno(r) != 0) return next_unsent;
                        if (r < batch_size) return next_unsent + r;
                    }
                    // send current message as own packet
                    const r = sendmsg(fd, &msg.msg_hdr, flags);
                    if (getErrno(r) != 0) return r;
                    // Linux limits the total bytes sent by sendmsg to INT_MAX, so this cast is safe.
                    msg.msg_len = @as(u32, @intCast(r));
                    next_unsent = i + 1;
                    break;
                }
            }
        }
        if (next_unsent < kvlen or next_unsent == 0) { // want to make sure at least one syscall occurs (e.g. to trigger MSG.EOR)
            const batch_size = kvlen - next_unsent;
            const r = syscall4(.sendmmsg, @as(usize, @bitCast(@as(isize, fd))), @intFromPtr(&msgvec[next_unsent]), batch_size, flags);
            if (getErrno(r) != 0) return r;
            return next_unsent + r;
        }
        return kvlen;
    }
    return syscall4(.sendmmsg, @as(usize, @bitCast(@as(isize, fd))), @intFromPtr(msgvec), vlen, flags);

}

pub fn connect(fd: i32, addr: *const anyopaque, len: socklen_t) usize {
    const fd_usize = @as(usize, @bitCast(@as(isize, fd)));
    const addr_usize = @intFromPtr(addr);
    if (native_arch == .x86) {
        return socketcall(SC.connect, &[3]usize{ fd_usize, addr_usize, len });
    } else {
        return syscall3(.connect, fd_usize, addr_usize, len);
    }

}

pub fn recvmsg(fd: i32, msg: *msghdr, flags: u32) usize {
    const fd_usize = @as(usize, @bitCast(@as(isize, fd)));
    const msg_usize = @intFromPtr(msg);
    if (native_arch == .x86) {
        return socketcall(SC.recvmsg, &[3]usize{ fd_usize, msg_usize, flags });
    } else {
        return syscall3(.recvmsg, fd_usize, msg_usize, flags);
    }

}

pub fn recvfrom(
    fd: i32,
    noalias buf: [*]u8,
    len: usize,
    flags: u32,
    noalias addr: ?*sockaddr,
    noalias alen: ?*socklen_t,
) usize {
    const fd_usize = @as(usize, @bitCast(@as(isize, fd)));
    const buf_usize = @intFromPtr(buf);
    const addr_usize = @intFromPtr(addr);
    const alen_usize = @intFromPtr(alen);
    if (native_arch == .x86) {
        return socketcall(SC.recvfrom, &[6]usize{ fd_usize, buf_usize, len, flags, addr_usize, alen_usize });
    } else {
        return syscall6(.recvfrom, fd_usize, buf_usize, len, flags, addr_usize, alen_usize);
    }

}

pub fn shutdown(fd: i32, how: i32) usize {
    if (native_arch == .x86) {
        return socketcall(SC.shutdown, &[2]usize{ @as(usize, @bitCast(@as(isize, fd))), @as(usize, @bitCast(@as(isize, how))) });
    }
    return syscall2(.shutdown, @as(usize, @bitCast(@as(isize, fd))), @as(usize, @bitCast(@as(isize, how))));

}

pub fn bind(fd: i32, addr: *const sockaddr, len: socklen_t) usize {
    if (native_arch == .x86) {
        return socketcall(SC.bind, &[3]usize{ @as(usize, @bitCast(@as(isize, fd))), @intFromPtr(addr), @as(usize, @intCast(len)) });
    }
    return syscall3(.bind, @as(usize, @bitCast(@as(isize, fd))), @intFromPtr(addr), @as(usize, @intCast(len)));

}

pub fn listen(fd: i32, backlog: u32) usize {
    if (native_arch == .x86) {
        return socketcall(SC.listen, &[2]usize{ @as(usize, @bitCast(@as(isize, fd))), backlog });
    }
    return syscall2(.listen, @as(usize, @bitCast(@as(isize, fd))), backlog);

}

pub fn sendto(fd: i32, buf: [*]const u8, len: usize, flags: u32, addr: ?*const sockaddr, alen: socklen_t) usize {
    if (native_arch == .x86) {
        return socketcall(SC.sendto, &[6]usize{ @as(usize, @bitCast(@as(isize, fd))), @intFromPtr(buf), len, flags, @intFromPtr(addr), @as(usize, @intCast(alen)) });
    }
    return syscall6(.sendto, @as(usize, @bitCast(@as(isize, fd))), @intFromPtr(buf), len, flags, @intFromPtr(addr), @as(usize, @intCast(alen)));

}

pub fn sendfile(outfd: i32, infd: i32, offset: ?*i64, count: usize) usize {
    if (@hasField(SYS, "sendfile64")) {
        return syscall4(
            .sendfile64,
            @as(usize, @bitCast(@as(isize, outfd))),
            @as(usize, @bitCast(@as(isize, infd))),
            @intFromPtr(offset),
            count,
        );
    } else {
        return syscall4(
            .sendfile,
            @as(usize, @bitCast(@as(isize, outfd))),
            @as(usize, @bitCast(@as(isize, infd))),
            @intFromPtr(offset),
            count,
        );
    }

}

pub fn socketpair(domain: i32, socket_type: i32, protocol: i32, fd: *[2]i32) usize {
    if (native_arch == .x86) {
        return socketcall(SC.socketpair, &[4]usize{ @as(usize, @intCast(domain)), @as(usize, @intCast(socket_type)), @as(usize, @intCast(protocol)), @intFromPtr(fd) });
    }
    return syscall4(.socketpair, @as(usize, @intCast(domain)), @as(usize, @intCast(socket_type)), @as(usize, @intCast(protocol)), @intFromPtr(fd));

}

pub fn accept(fd: i32, noalias addr: ?*sockaddr, noalias len: ?*socklen_t) usize {
    if (native_arch == .x86) {
        return socketcall(SC.accept, &[4]usize{ fd, addr, len, 0 });
    }
    return accept4(fd, addr, len, 0);

}

pub fn accept4(fd: i32, noalias addr: ?*sockaddr, noalias len: ?*socklen_t, flags: u32) usize {
    if (native_arch == .x86) {
        return socketcall(SC.accept4, &[4]usize{ @as(usize, @bitCast(@as(isize, fd))), @intFromPtr(addr), @intFromPtr(len), flags });
    }
    return syscall4(.accept4, @as(usize, @bitCast(@as(isize, fd))), @intFromPtr(addr), @intFromPtr(len), flags);

}

pub fn fstat(fd: i32, stat_buf: *Stat) usize {
    if (@hasField(SYS, "fstat64")) {
        return syscall2(.fstat64, @as(usize, @bitCast(@as(isize, fd))), @intFromPtr(stat_buf));
    } else {
        return syscall2(.fstat, @as(usize, @bitCast(@as(isize, fd))), @intFromPtr(stat_buf));
    }

}

pub fn stat(pathname: [*:0]const u8, statbuf: *Stat) usize {
    if (@hasField(SYS, "stat64")) {
        return syscall2(.stat64, @intFromPtr(pathname), @intFromPtr(statbuf));
    } else {
        return syscall2(.stat, @intFromPtr(pathname), @intFromPtr(statbuf));
    }

}

pub fn lstat(pathname: [*:0]const u8, statbuf: *Stat) usize {
    if (@hasField(SYS, "lstat64")) {
        return syscall2(.lstat64, @intFromPtr(pathname), @intFromPtr(statbuf));
    } else {
        return syscall2(.lstat, @intFromPtr(pathname), @intFromPtr(statbuf));
    }

}

pub fn fstatat(dirfd: i32, path: [*:0]const u8, stat_buf: *Stat, flags: u32) usize {
    if (@hasField(SYS, "fstatat64")) {
        return syscall4(.fstatat64, @as(usize, @bitCast(@as(isize, dirfd))), @intFromPtr(path), @intFromPtr(stat_buf), flags);
    } else {
        return syscall4(.fstatat, @as(usize, @bitCast(@as(isize, dirfd))), @intFromPtr(path), @intFromPtr(stat_buf), flags);
    }

}

pub fn statx(dirfd: i32, path: [*]const u8, flags: u32, mask: u32, statx_buf: *Statx) usize {
    if (@hasField(SYS, "statx")) {
        return syscall5(
            .statx,
            @as(usize, @bitCast(@as(isize, dirfd))),
            @intFromPtr(path),
            flags,
            mask,
            @intFromPtr(statx_buf),
        );
    }
    return @as(usize, @bitCast(-@as(isize, @intFromEnum(E.NOSYS))));

}

pub fn listxattr(path: [*:0]const u8, list: [*]u8, size: usize) usize {
    return syscall3(.listxattr, @intFromPtr(path), @intFromPtr(list), size);

}

pub fn llistxattr(path: [*:0]const u8, list: [*]u8, size: usize) usize {
    return syscall3(.llistxattr, @intFromPtr(path), @intFromPtr(list), size);

}

pub fn flistxattr(fd: usize, list: [*]u8, size: usize) usize {
    return syscall3(.flistxattr, fd, @intFromPtr(list), size);

}

pub fn getxattr(path: [*:0]const u8, name: [*:0]const u8, value: [*]u8, size: usize) usize {
    return syscall4(.getxattr, @intFromPtr(path), @intFromPtr(name), @intFromPtr(value), size);

}

pub fn lgetxattr(path: [*:0]const u8, name: [*:0]const u8, value: [*]u8, size: usize) usize {
    return syscall4(.lgetxattr, @intFromPtr(path), @intFromPtr(name), @intFromPtr(value), size);

}

pub fn fgetxattr(fd: usize, name: [*:0]const u8, value: [*]u8, size: usize) usize {
    return syscall4(.lgetxattr, fd, @intFromPtr(name), @intFromPtr(value), size);

}

pub fn setxattr(path: [*:0]const u8, name: [*:0]const u8, value: *const void, size: usize, flags: usize) usize {
    return syscall5(.setxattr, @intFromPtr(path), @intFromPtr(name), @intFromPtr(value), size, flags);

}

pub fn lsetxattr(path: [*:0]const u8, name: [*:0]const u8, value: *const void, size: usize, flags: usize) usize {
    return syscall5(.lsetxattr, @intFromPtr(path), @intFromPtr(name), @intFromPtr(value), size, flags);

}

pub fn fsetxattr(fd: usize, name: [*:0]const u8, value: *const void, size: usize, flags: usize) usize {
    return syscall5(.fsetxattr, fd, @intFromPtr(name), @intFromPtr(value), size, flags);

}

pub fn removexattr(path: [*:0]const u8, name: [*:0]const u8) usize {
    return syscall2(.removexattr, @intFromPtr(path), @intFromPtr(name));

}

pub fn lremovexattr(path: [*:0]const u8, name: [*:0]const u8) usize {
    return syscall2(.lremovexattr, @intFromPtr(path), @intFromPtr(name));

}

pub fn fremovexattr(fd: usize, name: [*:0]const u8) usize {
    return syscall2(.fremovexattr, fd, @intFromPtr(name));

}

pub fn sched_yield() usize {
    return syscall0(.sched_yield);

}

pub fn sched_getaffinity(pid: pid_t, size: usize, set: *cpu_set_t) usize {
    const rc = syscall3(.sched_getaffinity, @as(usize, @bitCast(@as(isize, pid))), size, @intFromPtr(set));
    if (@as(isize, @bitCast(rc)) < 0) return rc;
    if (rc < size) @memset(@as([*]u8, @ptrCast(set))[rc..size], 0);
    return 0;

}

pub fn epoll_create() usize {
    return epoll_create1(0);

}

pub fn epoll_create1(flags: usize) usize {
    return syscall1(.epoll_create1, flags);

}

pub fn epoll_ctl(epoll_fd: i32, op: u32, fd: i32, ev: ?*epoll_event) usize {
    return syscall4(.epoll_ctl, @as(usize, @bitCast(@as(isize, epoll_fd))), @as(usize, @intCast(op)), @as(usize, @bitCast(@as(isize, fd))), @intFromPtr(ev));

}

pub fn epoll_wait(epoll_fd: i32, events: [*]epoll_event, maxevents: u32, timeout: i32) usize {
    return epoll_pwait(epoll_fd, events, maxevents, timeout, null);

}

pub fn epoll_pwait(epoll_fd: i32, events: [*]epoll_event, maxevents: u32, timeout: i32, sigmask: ?*const sigset_t) usize {
    return syscall6(
        .epoll_pwait,
        @as(usize, @bitCast(@as(isize, epoll_fd))),
        @intFromPtr(events),
        @as(usize, @intCast(maxevents)),
        @as(usize, @bitCast(@as(isize, timeout))),
        @intFromPtr(sigmask),
        @sizeOf(sigset_t),
    );

}

pub fn eventfd(count: u32, flags: u32) usize {
    return syscall2(.eventfd2, count, flags);

}

pub fn timerfd_create(clockid: i32, flags: u32) usize {
    return syscall2(.timerfd_create, @as(usize, @bitCast(@as(isize, clockid))), flags);

}

pub const itimerspec = extern struct {
    it_interval: timespec,
    it_value: timespec,
};

pub fn timerfd_gettime(fd: i32, curr_value: *itimerspec) usize {
    return syscall2(.timerfd_gettime, @as(usize, @bitCast(@as(isize, fd))), @intFromPtr(curr_value));

}

pub fn timerfd_settime(fd: i32, flags: u32, new_value: *const itimerspec, old_value: ?*itimerspec) usize {
    return syscall4(.timerfd_settime, @as(usize, @bitCast(@as(isize, fd))), flags, @intFromPtr(new_value), @intFromPtr(old_value));

}

// Flags for the 'setitimer' system call
pub const ITIMER = enum(i32) {
    REAL = 0,
    VIRTUAL = 1,
    PROF = 2,
};

pub fn getitimer(which: i32, curr_value: *itimerspec) usize {
    return syscall2(.getitimer, @as(usize, @bitCast(@as(isize, which))), @intFromPtr(curr_value));

}

pub fn setitimer(which: i32, new_value: *const itimerspec, old_value: ?*itimerspec) usize {
    return syscall3(.setitimer, @as(usize, @bitCast(@as(isize, which))), @intFromPtr(new_value), @intFromPtr(old_value));

}

pub fn unshare(flags: usize) usize {
    return syscall1(.unshare, flags);

}

pub fn capget(hdrp: *cap_user_header_t, datap: *cap_user_data_t) usize {
    return syscall2(.capget, @intFromPtr(hdrp), @intFromPtr(datap));

}

pub fn capset(hdrp: *cap_user_header_t, datap: *const cap_user_data_t) usize {
    return syscall2(.capset, @intFromPtr(hdrp), @intFromPtr(datap));

}

pub fn sigaltstack(ss: ?*stack_t, old_ss: ?*stack_t) usize {
    return syscall2(.sigaltstack, @intFromPtr(ss), @intFromPtr(old_ss));

}

pub fn uname(uts: *utsname) usize {
    return syscall1(.uname, @intFromPtr(uts));

}

pub fn io_uring_setup(entries: u32, p: *io_uring_params) usize {
    return syscall2(.io_uring_setup, entries, @intFromPtr(p));

}

pub fn io_uring_enter(fd: i32, to_submit: u32, min_complete: u32, flags: u32, sig: ?*sigset_t) usize {
    return syscall6(.io_uring_enter, @as(usize, @bitCast(@as(isize, fd))), to_submit, min_complete, flags, @intFromPtr(sig), NSIG / 8);

}

pub fn io_uring_register(fd: i32, opcode: IORING_REGISTER, arg: ?*const anyopaque, nr_args: u32) usize {
    return syscall4(.io_uring_register, @as(usize, @bitCast(@as(isize, fd))), @intFromEnum(opcode), @intFromPtr(arg), nr_args);

}

pub fn memfd_create(name: [*:0]const u8, flags: u32) usize {
    return syscall2(.memfd_create, @intFromPtr(name), flags);

}

pub fn getrusage(who: i32, usage: *rusage) usize {
    return syscall2(.getrusage, @as(usize, @bitCast(@as(isize, who))), @intFromPtr(usage));

}

pub fn tcgetattr(fd: fd_t, termios_p: *termios) usize {
    return syscall3(.ioctl, @as(usize, @bitCast(@as(isize, fd))), T.CGETS, @intFromPtr(termios_p));

}

pub fn tcsetattr(fd: fd_t, optional_action: TCSA, termios_p: *const termios) usize {
    return syscall3(.ioctl, @as(usize, @bitCast(@as(isize, fd))), T.CSETS + @intFromEnum(optional_action), @intFromPtr(termios_p));

}

pub fn tcgetpgrp(fd: fd_t, pgrp: *pid_t) usize {
    return syscall3(.ioctl, @as(usize, @bitCast(@as(isize, fd))), T.IOCGPGRP, @intFromPtr(pgrp));

}

pub fn tcsetpgrp(fd: fd_t, pgrp: *const pid_t) usize {
    return syscall3(.ioctl, @as(usize, @bitCast(@as(isize, fd))), T.IOCSPGRP, @intFromPtr(pgrp));

}

pub fn tcdrain(fd: fd_t) usize {
    return syscall3(.ioctl, @as(usize, @bitCast(@as(isize, fd))), T.CSBRK, 1);

}

pub fn ioctl(fd: fd_t, request: u32, arg: usize) usize {
    return syscall3(.ioctl, @as(usize, @bitCast(@as(isize, fd))), request, arg);

}

pub fn signalfd(fd: fd_t, mask: *const sigset_t, flags: u32) usize {
    return syscall4(.signalfd4, @as(usize, @bitCast(@as(isize, fd))), @intFromPtr(mask), NSIG / 8, flags);

}

pub fn copy_file_range(fd_in: fd_t, off_in: ?*i64, fd_out: fd_t, off_out: ?*i64, len: usize, flags: u32) usize {
    return syscall6(
        .copy_file_range,
        @as(usize, @bitCast(@as(isize, fd_in))),
        @intFromPtr(off_in),
        @as(usize, @bitCast(@as(isize, fd_out))),
        @intFromPtr(off_out),
        len,
        flags,
    );

}

pub fn bpf(cmd: BPF.Cmd, attr: *BPF.Attr, size: u32) usize {
    return syscall3(.bpf, @intFromEnum(cmd), @intFromPtr(attr), size);

}

pub fn sync() void {
    _ = syscall0(.sync);

}

pub fn syncfs(fd: fd_t) usize {
    return syscall1(.syncfs, @as(usize, @bitCast(@as(isize, fd))));

}

pub fn fsync(fd: fd_t) usize {
    return syscall1(.fsync, @as(usize, @bitCast(@as(isize, fd))));

}

pub fn fdatasync(fd: fd_t) usize {
    return syscall1(.fdatasync, @as(usize, @bitCast(@as(isize, fd))));

}

pub fn prctl(option: i32, arg2: usize, arg3: usize, arg4: usize, arg5: usize) usize {
    return syscall5(.prctl, @as(usize, @bitCast(@as(isize, option))), arg2, arg3, arg4, arg5);

}

pub fn getrlimit(resource: rlimit_resource, rlim: *rlimit) usize {
    // use prlimit64 to have 64 bit limits on 32 bit platforms
    return prlimit(0, resource, null, rlim);

}

pub fn setrlimit(resource: rlimit_resource, rlim: *const rlimit) usize {
    // use prlimit64 to have 64 bit limits on 32 bit platforms
    return prlimit(0, resource, rlim, null);

}

pub fn prlimit(pid: pid_t, resource: rlimit_resource, new_limit: ?*const rlimit, old_limit: ?*rlimit) usize {
    return syscall4(
        .prlimit64,
        @as(usize, @bitCast(@as(isize, pid))),
        @as(usize, @bitCast(@as(isize, @intFromEnum(resource)))),
        @intFromPtr(new_limit),
        @intFromPtr(old_limit),
    );

}

pub fn mincore(address: [*]u8, len: usize, vec: [*]u8) usize {
    return syscall3(.mincore, @intFromPtr(address), len, @intFromPtr(vec));

}

pub fn madvise(address: [*]u8, len: usize, advice: u32) usize {
    return syscall3(.madvise, @intFromPtr(address), len, advice);

}

pub fn pidfd_open(pid: pid_t, flags: u32) usize {
    return syscall2(.pidfd_open, @as(usize, @bitCast(@as(isize, pid))), flags);

}

pub fn pidfd_getfd(pidfd: fd_t, targetfd: fd_t, flags: u32) usize {
    return syscall3(
        .pidfd_getfd,
        @as(usize, @bitCast(@as(isize, pidfd))),
        @as(usize, @bitCast(@as(isize, targetfd))),
        flags,
    );

}

pub fn pidfd_send_signal(pidfd: fd_t, sig: i32, info: ?*siginfo_t, flags: u32) usize {
    return syscall4(
        .pidfd_send_signal,
        @as(usize, @bitCast(@as(isize, pidfd))),
        @as(usize, @bitCast(@as(isize, sig))),
        @intFromPtr(info),
        flags,
    );

}

pub fn process_vm_readv(pid: pid_t, local: []iovec, remote: []const iovec_const, flags: usize) usize {
    return syscall6(
        .process_vm_readv,
        @as(usize, @bitCast(@as(isize, pid))),
        @intFromPtr(local.ptr),
        local.len,
        @intFromPtr(remote.ptr),
        remote.len,
        flags,
    );

}

pub fn process_vm_writev(pid: pid_t, local: []const iovec_const, remote: []const iovec_const, flags: usize) usize {
    return syscall6(
        .process_vm_writev,
        @as(usize, @bitCast(@as(isize, pid))),
        @intFromPtr(local.ptr),
        local.len,
        @intFromPtr(remote.ptr),
        remote.len,
        flags,
    );

}

pub fn fadvise(fd: fd_t, offset: i64, len: i64, advice: usize) usize {
    if (comptime builtin.cpu.arch.isMIPS()) {
        // MIPS requires a 7 argument syscall

        const offset_halves = splitValue64(offset);
        const length_halves = splitValue64(len);

        return syscall7(
            .fadvise64,
            @as(usize, @bitCast(@as(isize, fd))),
            0,
            offset_halves[0],
            offset_halves[1],
            length_halves[0],
            length_halves[1],
            advice,
        );
    } else if (comptime builtin.cpu.arch.isARM()) {
        // ARM reorders the arguments

        const offset_halves = splitValue64(offset);
        const length_halves = splitValue64(len);

        return syscall6(
            .fadvise64_64,
            @as(usize, @bitCast(@as(isize, fd))),
            advice,
            offset_halves[0],
            offset_halves[1],
            length_halves[0],
            length_halves[1],
        );
    } else if (@hasField(SYS, "fadvise64_64") and usize_bits != 64) {
        // The extra usize check is needed to avoid SPARC64 because it provides both
        // fadvise64 and fadvise64_64 but the latter behaves differently than other platforms.

        const offset_halves = splitValue64(offset);
        const length_halves = splitValue64(len);

        return syscall6(
            .fadvise64_64,
            @as(usize, @bitCast(@as(isize, fd))),
            offset_halves[0],
            offset_halves[1],
            length_halves[0],
            length_halves[1],
            advice,
        );
    } else {
        return syscall4(
            .fadvise64,
            @as(usize, @bitCast(@as(isize, fd))),
            @as(usize, @bitCast(offset)),
            @as(usize, @bitCast(len)),
            advice,
        );
    }

}

pub fn perf_event_open(
    attr: *perf_event_attr,
    pid: pid_t,
    cpu: i32,
    group_fd: fd_t,
    flags: usize,
) usize {
    return syscall5(
        .perf_event_open,
        @intFromPtr(attr),
        @as(usize, @bitCast(@as(isize, pid))),
        @as(usize, @bitCast(@as(isize, cpu))),
        @as(usize, @bitCast(@as(isize, group_fd))),
        flags,
    );

}

pub fn seccomp(operation: u32, flags: u32, args: ?*const anyopaque) usize {
    return syscall3(.seccomp, operation, flags, @intFromPtr(args));

}

pub fn ptrace(
    req: u32,
    pid: pid_t,
    addr: usize,
    data: usize,
    addr2: usize,
) usize {
    return syscall5(
        .ptrace,
        req,
        @as(usize, @bitCast(@as(isize, pid))),
        addr,
        data,
        addr2,
    );

}

pub const E = switch (native_arch) {
    .mips, .mipsel => @import("linux/errno/mips.zig").E,
    .sparc, .sparcel, .sparc64 => @import("linux/errno/sparc.zig").E,
    else => @import("linux/errno/generic.zig").E,
};

pub const pid_t = i32;
pub const fd_t = i32;
pub const uid_t = u32;
pub const gid_t = u32;
pub const clock_t = isize;

pub const NAME_MAX = 255;
pub const PATH_MAX = 4096;
pub const IOV_MAX = 1024;

/// Largest hardware address length
/// e.g. a mac address is a type of hardware address
pub const MAX_ADDR_LEN = 32;

pub const STDIN_FILENO = 0;
pub const STDOUT_FILENO = 1;
pub const STDERR_FILENO = 2;

pub const AT = struct {
    /// Special value used to indicate openat should use the current working directory
    pub const FDCWD = -100;

    /// Do not follow symbolic links
    pub const SYMLINK_NOFOLLOW = 0x100;

    /// Remove directory instead of unlinking file
    pub const REMOVEDIR = 0x200;

    /// Follow symbolic links.
    pub const SYMLINK_FOLLOW = 0x400;

    /// Suppress terminal automount traversal
    pub const NO_AUTOMOUNT = 0x800;

    /// Allow empty relative pathname
    pub const EMPTY_PATH = 0x1000;

    /// Type of synchronisation required from statx()
    pub const STATX_SYNC_TYPE = 0x6000;

    /// - Do whatever stat() does
    pub const STATX_SYNC_AS_STAT = 0x0000;

    /// - Force the attributes to be sync'd with the server
    pub const STATX_FORCE_SYNC = 0x2000;

    /// - Don't sync attributes with the server
    pub const STATX_DONT_SYNC = 0x4000;

    /// Apply to the entire subtree
    pub const RECURSIVE = 0x8000;
};

pub const FALLOC = struct {
    /// Default is extend size
    pub const FL_KEEP_SIZE = 0x01;

    /// De-allocates range
    pub const FL_PUNCH_HOLE = 0x02;

    /// Reserved codepoint
    pub const FL_NO_HIDE_STALE = 0x04;

    /// Removes a range of a file without leaving a hole in the file
    pub const FL_COLLAPSE_RANGE = 0x08;

    /// Converts a range of file to zeros preferably without issuing data IO
    pub const FL_ZERO_RANGE = 0x10;

    /// Inserts space within the file size without overwriting any existing data
    pub const FL_INSERT_RANGE = 0x20;

    /// Unshares shared blocks within the file size without overwriting any existing data
    pub const FL_UNSHARE_RANGE = 0x40;
};

pub const FUTEX = struct {
    pub const WAIT = 0;
    pub const WAKE = 1;
    pub const FD = 2;
    pub const REQUEUE = 3;
    pub const CMP_REQUEUE = 4;
    pub const WAKE_OP = 5;
    pub const LOCK_PI = 6;
    pub const UNLOCK_PI = 7;
    pub const TRYLOCK_PI = 8;
    pub const WAIT_BITSET = 9;
    pub const WAKE_BITSET = 10;
    pub const WAIT_REQUEUE_PI = 11;
    pub const CMP_REQUEUE_PI = 12;

    pub const PRIVATE_FLAG = 128;

    pub const CLOCK_REALTIME = 256;
};

pub const PROT = struct {
    /// page can not be accessed
    pub const NONE = 0x0;
    /// page can be read
    pub const READ = 0x1;
    /// page can be written
    pub const WRITE = 0x2;
    /// page can be executed
    pub const EXEC = 0x4;
    /// page may be used for atomic ops
    pub const SEM = switch (native_arch) {
        // TODO: also xtensa
        .mips, .mipsel, .mips64, .mips64el => 0x10,
        else => 0x8,
    };
    /// mprotect flag: extend change to start of growsdown vma
    pub const GROWSDOWN = 0x01000000;
    /// mprotect flag: extend change to end of growsup vma
    pub const GROWSUP = 0x02000000;
};

pub const FD_CLOEXEC = 1;

pub const F_OK = 0;
pub const X_OK = 1;
pub const W_OK = 2;
pub const R_OK = 4;

pub const W = struct {
    pub const NOHANG = 1;
    pub const UNTRACED = 2;
    pub const STOPPED = 2;
    pub const EXITED = 4;
    pub const CONTINUED = 8;
    pub const NOWAIT = 0x1000000;

    pub fn EXITSTATUS(s: u32) u8 {
        return @as(u8, @intCast((s & 0xff00) >> 8));
    }
    pub fn TERMSIG(s: u32) u32 {
        return s & 0x7f;
    }
    pub fn STOPSIG(s: u32) u32 {
        return EXITSTATUS(s);
    }
    pub fn IFEXITED(s: u32) bool {
        return TERMSIG(s) == 0;
    }
    pub fn IFSTOPPED(s: u32) bool {
        return @as(u16, @truncate(((s & 0xffff) *% 0x10001) >> 8)) > 0x7f00;
    }
    pub fn IFSIGNALED(s: u32) bool {
        return (s & 0xffff) -% 1 < 0xff;
    }
};

// waitid id types
pub const P = enum(c_uint) {
    ALL = 0,
    PID = 1,
    PGID = 2,
    PIDFD = 3,
    _,
};

pub const SA = if (is_mips) struct {
    pub const NOCLDSTOP = 1;
    pub const NOCLDWAIT = 0x10000;
    pub const SIGINFO = 8;
    pub const RESTART = 0x10000000;
    pub const RESETHAND = 0x80000000;
    pub const ONSTACK = 0x08000000;
    pub const NODEFER = 0x40000000;
    pub const RESTORER = 0x04000000;
} else if (is_sparc) struct {
    pub const NOCLDSTOP = 0x8;
    pub const NOCLDWAIT = 0x100;
    pub const SIGINFO = 0x200;
    pub const RESTART = 0x2;
    pub const RESETHAND = 0x4;
    pub const ONSTACK = 0x1;
    pub const NODEFER = 0x20;
    pub const RESTORER = 0x04000000;
} else struct {
    pub const NOCLDSTOP = 1;
    pub const NOCLDWAIT = 2;
    pub const SIGINFO = 4;
    pub const RESTART = 0x10000000;
    pub const RESETHAND = 0x80000000;
    pub const ONSTACK = 0x08000000;
    pub const NODEFER = 0x40000000;
    pub const RESTORER = 0x04000000;
};

pub const SIG = if (is_mips) struct {
    pub const BLOCK = 1;
    pub const UNBLOCK = 2;
    pub const SETMASK = 3;

    pub const HUP = 1;
    pub const INT = 2;
    pub const QUIT = 3;
    pub const ILL = 4;
    pub const TRAP = 5;
    pub const ABRT = 6;
    pub const IOT = ABRT;
    pub const BUS = 7;
    pub const FPE = 8;
    pub const KILL = 9;
    pub const USR1 = 10;
    pub const SEGV = 11;
    pub const USR2 = 12;
    pub const PIPE = 13;
    pub const ALRM = 14;
    pub const TERM = 15;
    pub const STKFLT = 16;
    pub const CHLD = 17;
    pub const CONT = 18;
    pub const STOP = 19;
    pub const TSTP = 20;
    pub const TTIN = 21;
    pub const TTOU = 22;
    pub const URG = 23;
    pub const XCPU = 24;
    pub const XFSZ = 25;
    pub const VTALRM = 26;
    pub const PROF = 27;
    pub const WINCH = 28;
    pub const IO = 29;
    pub const POLL = 29;
    pub const PWR = 30;
    pub const SYS = 31;
    pub const UNUSED = SIG.SYS;

    pub const ERR = @as(?Sigaction.handler_fn, @ptrFromInt(maxInt(usize)));
    pub const DFL = @as(?Sigaction.handler_fn, @ptrFromInt(0));
    pub const IGN = @as(?Sigaction.handler_fn, @ptrFromInt(1));
} else if (is_sparc) struct {
    pub const BLOCK = 1;
    pub const UNBLOCK = 2;
    pub const SETMASK = 4;

    pub const HUP = 1;
    pub const INT = 2;
    pub const QUIT = 3;
    pub const ILL = 4;
    pub const TRAP = 5;
    pub const ABRT = 6;
    pub const EMT = 7;
    pub const FPE = 8;
    pub const KILL = 9;
    pub const BUS = 10;
    pub const SEGV = 11;
    pub const SYS = 12;
    pub const PIPE = 13;
    pub const ALRM = 14;
    pub const TERM = 15;
    pub const URG = 16;
    pub const STOP = 17;
    pub const TSTP = 18;
    pub const CONT = 19;
    pub const CHLD = 20;
    pub const TTIN = 21;
    pub const TTOU = 22;
    pub const POLL = 23;
    pub const XCPU = 24;
    pub const XFSZ = 25;
    pub const VTALRM = 26;
    pub const PROF = 27;
    pub const WINCH = 28;
    pub const LOST = 29;
    pub const USR1 = 30;
    pub const USR2 = 31;
    pub const IOT = ABRT;
    pub const CLD = CHLD;
    pub const PWR = LOST;
    pub const IO = SIG.POLL;

    pub const ERR = @as(?Sigaction.handler_fn, @ptrFromInt(maxInt(usize)));
    pub const DFL = @as(?Sigaction.handler_fn, @ptrFromInt(0));
    pub const IGN = @as(?Sigaction.handler_fn, @ptrFromInt(1));
} else struct {
    pub const BLOCK = 0;
    pub const UNBLOCK = 1;
    pub const SETMASK = 2;

    pub const HUP = 1;
    pub const INT = 2;
    pub const QUIT = 3;
    pub const ILL = 4;
    pub const TRAP = 5;
    pub const ABRT = 6;
    pub const IOT = ABRT;
    pub const BUS = 7;
    pub const FPE = 8;
    pub const KILL = 9;
    pub const USR1 = 10;
    pub const SEGV = 11;
    pub const USR2 = 12;
    pub const PIPE = 13;
    pub const ALRM = 14;
    pub const TERM = 15;
    pub const STKFLT = 16;
    pub const CHLD = 17;
    pub const CONT = 18;
    pub const STOP = 19;
    pub const TSTP = 20;
    pub const TTIN = 21;
    pub const TTOU = 22;
    pub const URG = 23;
    pub const XCPU = 24;
    pub const XFSZ = 25;
    pub const VTALRM = 26;
    pub const PROF = 27;
    pub const WINCH = 28;
    pub const IO = 29;
    pub const POLL = 29;
    pub const PWR = 30;
    pub const SYS = 31;
    pub const UNUSED = SIG.SYS;

    pub const ERR = @as(?Sigaction.handler_fn, @ptrFromInt(maxInt(usize)));
    pub const DFL = @as(?Sigaction.handler_fn, @ptrFromInt(0));
    pub const IGN = @as(?Sigaction.handler_fn, @ptrFromInt(1));
};

pub const kernel_rwf = u32;

pub const RWF = struct {
    /// high priority request, poll if possible
    pub const HIPRI: kernel_rwf = 0x00000001;

    /// per-IO O.DSYNC
    pub const DSYNC: kernel_rwf = 0x00000002;

    /// per-IO O.SYNC
    pub const SYNC: kernel_rwf = 0x00000004;

    /// per-IO, return -EAGAIN if operation would block
    pub const NOWAIT: kernel_rwf = 0x00000008;

    /// per-IO O.APPEND
    pub const APPEND: kernel_rwf = 0x00000010;
};

pub const SEEK = struct {
    pub const SET = 0;
    pub const CUR = 1;
    pub const END = 2;
};

pub const SHUT = struct {
    pub const RD = 0;
    pub const WR = 1;
    pub const RDWR = 2;
};

pub const SOCK = struct {
    pub const STREAM = if (is_mips) 2 else 1;
    pub const DGRAM = if (is_mips) 1 else 2;
    pub const RAW = 3;
    pub const RDM = 4;
    pub const SEQPACKET = 5;
    pub const DCCP = 6;
    pub const PACKET = 10;
    pub const CLOEXEC = if (is_sparc) 0o20000000 else 0o2000000;
    pub const NONBLOCK = if (is_mips) 0o200 else if (is_sparc) 0o40000 else 0o4000;
};

pub const TCP = struct {
    /// Turn off Nagle's algorithm
    pub const NODELAY = 1;
    /// Limit MSS
    pub const MAXSEG = 2;
    /// Never send partially complete segments.
    pub const CORK = 3;
    /// Start keeplives after this period, in seconds
    pub const KEEPIDLE = 4;
    /// Interval between keepalives
    pub const KEEPINTVL = 5;
    /// Number of keepalives before death
    pub const KEEPCNT = 6;
    /// Number of SYN retransmits
    pub const SYNCNT = 7;
    /// Life time of orphaned FIN-WAIT-2 state
    pub const LINGER2 = 8;
    /// Wake up listener only when data arrive
    pub const DEFER_ACCEPT = 9;
    /// Bound advertised window
    pub const WINDOW_CLAMP = 10;
    /// Information about this connection.
    pub const INFO = 11;
    /// Block/reenable quick acks
    pub const QUICKACK = 12;
    /// Congestion control algorithm
    pub const CONGESTION = 13;
    /// TCP MD5 Signature (RFC2385)
    pub const MD5SIG = 14;
    /// Use linear timeouts for thin streams
    pub const THIN_LINEAR_TIMEOUTS = 16;
    /// Fast retrans. after 1 dupack
    pub const THIN_DUPACK = 17;
    /// How long for loss retry before timeout
    pub const USER_TIMEOUT = 18;
    /// TCP sock is under repair right now
    pub const REPAIR = 19;
    pub const REPAIR_QUEUE = 20;
    pub const QUEUE_SEQ = 21;
    pub const REPAIR_OPTIONS = 22;
    /// Enable FastOpen on listeners
    pub const FASTOPEN = 23;
    pub const TIMESTAMP = 24;
    /// limit number of unsent bytes in write queue
    pub const NOTSENT_LOWAT = 25;
    /// Get Congestion Control (optional) info
    pub const CC_INFO = 26;
    /// Record SYN headers for new connections
    pub const SAVE_SYN = 27;
    /// Get SYN headers recorded for connection
    pub const SAVED_SYN = 28;
    /// Get/set window parameters
    pub const REPAIR_WINDOW = 29;
    /// Attempt FastOpen with connect
    pub const FASTOPEN_CONNECT = 30;
    /// Attach a ULP to a TCP connection
    pub const ULP = 31;
    /// TCP MD5 Signature with extensions
    pub const MD5SIG_EXT = 32;
    /// Set the key for Fast Open (cookie)

    pub const FASTOPEN_KEY = 33;
    /// Enable TFO without a TFO cookie

    pub const FASTOPEN_NO_COOKIE = 34;

    pub const ZEROCOPY_RECEIVE = 35;
    /// Notify bytes available to read as a cmsg on read

    pub const INQ = 36;

    pub const CM_INQ = INQ;
    /// delay outgoing packets by XX usec

    pub const TX_DELAY = 37;

    pub const REPAIR_ON = 1;

    pub const REPAIR_OFF = 0;
    /// Turn off without window probes

    pub const REPAIR_OFF_NO_WP = -1;
};

pub const PF = struct {

    pub const UNSPEC = 0;

    pub const LOCAL = 1;

    pub const UNIX = LOCAL;

    pub const FILE = LOCAL;

    pub const INET = 2;

    pub const AX25 = 3;

    pub const IPX = 4;

    pub const APPLETALK = 5;

    pub const NETROM = 6;

    pub const BRIDGE = 7;

    pub const ATMPVC = 8;

    pub const X25 = 9;

    pub const INET6 = 10;

    pub const ROSE = 11;

    pub const DECnet = 12;

    pub const NETBEUI = 13;

    pub const SECURITY = 14;

    pub const KEY = 15;

    pub const NETLINK = 16;

    pub const ROUTE = PF.NETLINK;

    pub const PACKET = 17;

    pub const ASH = 18;

    pub const ECONET = 19;

    pub const ATMSVC = 20;

    pub const RDS = 21;

    pub const SNA = 22;

    pub const IRDA = 23;

    pub const PPPOX = 24;

    pub const WANPIPE = 25;

    pub const LLC = 26;

    pub const IB = 27;

    pub const MPLS = 28;

    pub const CAN = 29;

    pub const TIPC = 30;

    pub const BLUETOOTH = 31;

    pub const IUCV = 32;

    pub const RXRPC = 33;

    pub const ISDN = 34;

    pub const PHONET = 35;

    pub const IEEE802154 = 36;

    pub const CAIF = 37;

    pub const ALG = 38;

    pub const NFC = 39;

    pub const VSOCK = 40;

    pub const KCM = 41;

    pub const QIPCRTR = 42;

    pub const SMC = 43;

    pub const XDP = 44;

    pub const MAX = 45;
};

pub const AF = struct {

    pub const UNSPEC = PF.UNSPEC;

    pub const LOCAL = PF.LOCAL;

    pub const UNIX = AF.LOCAL;

    pub const FILE = AF.LOCAL;

    pub const INET = PF.INET;

    pub const AX25 = PF.AX25;

    pub const IPX = PF.IPX;

    pub const APPLETALK = PF.APPLETALK;

    pub const NETROM = PF.NETROM;

    pub const BRIDGE = PF.BRIDGE;

    pub const ATMPVC = PF.ATMPVC;

    pub const X25 = PF.X25;

    pub const INET6 = PF.INET6;

    pub const ROSE = PF.ROSE;

    pub const DECnet = PF.DECnet;

    pub const NETBEUI = PF.NETBEUI;

    pub const SECURITY = PF.SECURITY;

    pub const KEY = PF.KEY;

    pub const NETLINK = PF.NETLINK;

    pub const ROUTE = PF.ROUTE;

    pub const PACKET = PF.PACKET;

    pub const ASH = PF.ASH;

    pub const ECONET = PF.ECONET;

    pub const ATMSVC = PF.ATMSVC;

    pub const RDS = PF.RDS;

    pub const SNA = PF.SNA;

    pub const IRDA = PF.IRDA;

    pub const PPPOX = PF.PPPOX;

    pub const WANPIPE = PF.WANPIPE;

    pub const LLC = PF.LLC;

    pub const IB = PF.IB;

    pub const MPLS = PF.MPLS;

    pub const CAN = PF.CAN;

    pub const TIPC = PF.TIPC;

    pub const BLUETOOTH = PF.BLUETOOTH;

    pub const IUCV = PF.IUCV;

    pub const RXRPC = PF.RXRPC;

    pub const ISDN = PF.ISDN;

    pub const PHONET = PF.PHONET;

    pub const IEEE802154 = PF.IEEE802154;

    pub const CAIF = PF.CAIF;

    pub const ALG = PF.ALG;

    pub const NFC = PF.NFC;

    pub const VSOCK = PF.VSOCK;

    pub const KCM = PF.KCM;

    pub const QIPCRTR = PF.QIPCRTR;

    pub const SMC = PF.SMC;

    pub const XDP = PF.XDP;

    pub const MAX = PF.MAX;
};

pub const SO = struct {
    pub usingnamespace if (is_mips) struct {

        pub const DEBUG = 1;

        pub const REUSEADDR = 0x0004;

        pub const KEEPALIVE = 0x0008;

        pub const DONTROUTE = 0x0010;

        pub const BROADCAST = 0x0020;

        pub const LINGER = 0x0080;

        pub const OOBINLINE = 0x0100;

        pub const REUSEPORT = 0x0200;

        pub const SNDBUF = 0x1001;

        pub const RCVBUF = 0x1002;

        pub const SNDLOWAT = 0x1003;

        pub const RCVLOWAT = 0x1004;

        pub const RCVTIMEO = 0x1006;

        pub const SNDTIMEO = 0x1005;

        pub const ERROR = 0x1007;

        pub const TYPE = 0x1008;

        pub const ACCEPTCONN = 0x1009;

        pub const PROTOCOL = 0x1028;

        pub const DOMAIN = 0x1029;

        pub const NO_CHECK = 11;

        pub const PRIORITY = 12;

        pub const BSDCOMPAT = 14;

        pub const PASSCRED = 17;

        pub const PEERCRED = 18;

        pub const PEERSEC = 30;

        pub const SNDBUFFORCE = 31;

        pub const RCVBUFFORCE = 33;

        pub const SECURITY_AUTHENTICATION = 22;

        pub const SECURITY_ENCRYPTION_TRANSPORT = 23;

        pub const SECURITY_ENCRYPTION_NETWORK = 24;

        pub const BINDTODEVICE = 25;

        pub const ATTACH_FILTER = 26;

        pub const DETACH_FILTER = 27;

        pub const GET_FILTER = ATTACH_FILTER;

        pub const PEERNAME = 28;

        pub const TIMESTAMP_OLD = 29;

        pub const PASSSEC = 34;

        pub const TIMESTAMPNS_OLD = 35;

        pub const MARK = 36;

        pub const TIMESTAMPING_OLD = 37;

        pub const RXQ_OVFL = 40;

        pub const WIFI_STATUS = 41;

        pub const PEEK_OFF = 42;

        pub const NOFCS = 43;

        pub const LOCK_FILTER = 44;

        pub const SELECT_ERR_QUEUE = 45;

        pub const BUSY_POLL = 46;

        pub const MAX_PACING_RATE = 47;

        pub const BPF_EXTENSIONS = 48;

        pub const INCOMING_CPU = 49;

        pub const ATTACH_BPF = 50;

        pub const DETACH_BPF = DETACH_FILTER;

        pub const ATTACH_REUSEPORT_CBPF = 51;

        pub const ATTACH_REUSEPORT_EBPF = 52;

        pub const CNX_ADVICE = 53;

        pub const MEMINFO = 55;

        pub const INCOMING_NAPI_ID = 56;

        pub const COOKIE = 57;

        pub const PEERGROUPS = 59;

        pub const ZEROCOPY = 60;

        pub const TXTIME = 61;

        pub const BINDTOIFINDEX = 62;

        pub const TIMESTAMP_NEW = 63;

        pub const TIMESTAMPNS_NEW = 64;

        pub const TIMESTAMPING_NEW = 65;

        pub const RCVTIMEO_NEW = 66;

        pub const SNDTIMEO_NEW = 67;

        pub const DETACH_REUSEPORT_BPF = 68;
    } else if (is_ppc or is_ppc64) struct {

        pub const DEBUG = 1;

        pub const REUSEADDR = 2;

        pub const TYPE = 3;

        pub const ERROR = 4;

        pub const DONTROUTE = 5;

        pub const BROADCAST = 6;

        pub const SNDBUF = 7;

        pub const RCVBUF = 8;

        pub const KEEPALIVE = 9;

        pub const OOBINLINE = 10;

        pub const NO_CHECK = 11;

        pub const PRIORITY = 12;

        pub const LINGER = 13;

        pub const BSDCOMPAT = 14;

        pub const REUSEPORT = 15;

        pub const RCVLOWAT = 16;

        pub const SNDLOWAT = 17;

        pub const RCVTIMEO = 18;

        pub const SNDTIMEO = 19;

        pub const PASSCRED = 20;

        pub const PEERCRED = 21;

        pub const ACCEPTCONN = 30;

        pub const PEERSEC = 31;

        pub const SNDBUFFORCE = 32;

        pub const RCVBUFFORCE = 33;

        pub const PROTOCOL = 38;

        pub const DOMAIN = 39;

        pub const SECURITY_AUTHENTICATION = 22;

        pub const SECURITY_ENCRYPTION_TRANSPORT = 23;

        pub const SECURITY_ENCRYPTION_NETWORK = 24;

        pub const BINDTODEVICE = 25;

        pub const ATTACH_FILTER = 26;

        pub const DETACH_FILTER = 27;

        pub const GET_FILTER = ATTACH_FILTER;

        pub const PEERNAME = 28;

        pub const TIMESTAMP_OLD = 29;

        pub const PASSSEC = 34;

        pub const TIMESTAMPNS_OLD = 35;

        pub const MARK = 36;

        pub const TIMESTAMPING_OLD = 37;

        pub const RXQ_OVFL = 40;

        pub const WIFI_STATUS = 41;

        pub const PEEK_OFF = 42;

        pub const NOFCS = 43;

        pub const LOCK_FILTER = 44;

        pub const SELECT_ERR_QUEUE = 45;

        pub const BUSY_POLL = 46;

        pub const MAX_PACING_RATE = 47;

        pub const BPF_EXTENSIONS = 48;

        pub const INCOMING_CPU = 49;

        pub const ATTACH_BPF = 50;

        pub const DETACH_BPF = DETACH_FILTER;

        pub const ATTACH_REUSEPORT_CBPF = 51;

        pub const ATTACH_REUSEPORT_EBPF = 52;

        pub const CNX_ADVICE = 53;

        pub const MEMINFO = 55;

        pub const INCOMING_NAPI_ID = 56;

        pub const COOKIE = 57;

        pub const PEERGROUPS = 59;

        pub const ZEROCOPY = 60;

        pub const TXTIME = 61;

        pub const BINDTOIFINDEX = 62;

        pub const TIMESTAMP_NEW = 63;

        pub const TIMESTAMPNS_NEW = 64;

        pub const TIMESTAMPING_NEW = 65;

        pub const RCVTIMEO_NEW = 66;

        pub const SNDTIMEO_NEW = 67;

        pub const DETACH_REUSEPORT_BPF = 68;
    } else if (is_sparc) struct {

        pub const DEBUG = 1;

        pub const REUSEADDR = 4;

        pub const TYPE = 4104;

        pub const ERROR = 4103;

        pub const DONTROUTE = 16;

        pub const BROADCAST = 32;

        pub const SNDBUF = 4097;

        pub const RCVBUF = 4098;

        pub const KEEPALIVE = 8;

        pub const OOBINLINE = 256;

        pub const NO_CHECK = 11;

        pub const PRIORITY = 12;

        pub const LINGER = 128;

        pub const BSDCOMPAT = 1024;

        pub const REUSEPORT = 512;

        pub const PASSCRED = 2;

        pub const PEERCRED = 64;

        pub const RCVLOWAT = 2048;

        pub const SNDLOWAT = 4096;

        pub const RCVTIMEO = 8192;

        pub const SNDTIMEO = 16384;

        pub const ACCEPTCONN = 32768;

        pub const PEERSEC = 30;

        pub const SNDBUFFORCE = 4106;

        pub const RCVBUFFORCE = 4107;

        pub const PROTOCOL = 4136;

        pub const DOMAIN = 4137;

        pub const SECURITY_AUTHENTICATION = 20481;

        pub const SECURITY_ENCRYPTION_TRANSPORT = 20482;

        pub const SECURITY_ENCRYPTION_NETWORK = 20484;

        pub const BINDTODEVICE = 13;

        pub const ATTACH_FILTER = 26;

        pub const DETACH_FILTER = 27;

        pub const GET_FILTER = 26;

        pub const PEERNAME = 28;

        pub const TIMESTAMP_OLD = 29;

        pub const PASSSEC = 31;

        pub const TIMESTAMPNS_OLD = 33;

        pub const MARK = 34;

        pub const TIMESTAMPING_OLD = 35;

        pub const RXQ_OVFL = 36;

        pub const WIFI_STATUS = 37;

        pub const PEEK_OFF = 38;

        pub const NOFCS = 39;

        pub const LOCK_FILTER = 40;

        pub const SELECT_ERR_QUEUE = 41;

        pub const BUSY_POLL = 48;

        pub const MAX_PACING_RATE = 49;

        pub const BPF_EXTENSIONS = 50;

        pub const INCOMING_CPU = 51;

        pub const ATTACH_BPF = 52;

        pub const DETACH_BPF = 27;

        pub const ATTACH_REUSEPORT_CBPF = 53;

        pub const ATTACH_REUSEPORT_EBPF = 54;

        pub const CNX_ADVICE = 55;

        pub const MEMINFO = 57;

        pub const INCOMING_NAPI_ID = 58;

        pub const COOKIE = 59;

        pub const PEERGROUPS = 61;

        pub const ZEROCOPY = 62;

        pub const TXTIME = 63;

        pub const BINDTOIFINDEX = 65;

        pub const TIMESTAMP_NEW = 70;

        pub const TIMESTAMPNS_NEW = 66;

        pub const TIMESTAMPING_NEW = 67;

        pub const RCVTIMEO_NEW = 68;

        pub const SNDTIMEO_NEW = 69;

        pub const DETACH_REUSEPORT_BPF = 71;
    } else struct {

        pub const DEBUG = 1;

        pub const REUSEADDR = 2;

        pub const TYPE = 3;

        pub const ERROR = 4;

        pub const DONTROUTE = 5;

        pub const BROADCAST = 6;

        pub const SNDBUF = 7;

        pub const RCVBUF = 8;

        pub const KEEPALIVE = 9;

        pub const OOBINLINE = 10;

        pub const NO_CHECK = 11;

        pub const PRIORITY = 12;

        pub const LINGER = 13;

        pub const BSDCOMPAT = 14;

        pub const REUSEPORT = 15;

        pub const PASSCRED = 16;

        pub const PEERCRED = 17;

        pub const RCVLOWAT = 18;

        pub const SNDLOWAT = 19;

        pub const RCVTIMEO = 20;

        pub const SNDTIMEO = 21;

        pub const ACCEPTCONN = 30;

        pub const PEERSEC = 31;

        pub const SNDBUFFORCE = 32;

        pub const RCVBUFFORCE = 33;

        pub const PROTOCOL = 38;

        pub const DOMAIN = 39;

        pub const SECURITY_AUTHENTICATION = 22;

        pub const SECURITY_ENCRYPTION_TRANSPORT = 23;

        pub const SECURITY_ENCRYPTION_NETWORK = 24;

        pub const BINDTODEVICE = 25;

        pub const ATTACH_FILTER = 26;

        pub const DETACH_FILTER = 27;

        pub const GET_FILTER = ATTACH_FILTER;

        pub const PEERNAME = 28;

        pub const TIMESTAMP_OLD = 29;

        pub const PASSSEC = 34;

        pub const TIMESTAMPNS_OLD = 35;

        pub const MARK = 36;

        pub const TIMESTAMPING_OLD = 37;

        pub const RXQ_OVFL = 40;

        pub const WIFI_STATUS = 41;

        pub const PEEK_OFF = 42;

        pub const NOFCS = 43;

        pub const LOCK_FILTER = 44;

        pub const SELECT_ERR_QUEUE = 45;

        pub const BUSY_POLL = 46;

        pub const MAX_PACING_RATE = 47;

        pub const BPF_EXTENSIONS = 48;

        pub const INCOMING_CPU = 49;

        pub const ATTACH_BPF = 50;

        pub const DETACH_BPF = DETACH_FILTER;

        pub const ATTACH_REUSEPORT_CBPF = 51;

        pub const ATTACH_REUSEPORT_EBPF = 52;

        pub const CNX_ADVICE = 53;

        pub const MEMINFO = 55;

        pub const INCOMING_NAPI_ID = 56;

        pub const COOKIE = 57;

        pub const PEERGROUPS = 59;

        pub const ZEROCOPY = 60;

        pub const TXTIME = 61;

        pub const BINDTOIFINDEX = 62;

        pub const TIMESTAMP_NEW = 63;

        pub const TIMESTAMPNS_NEW = 64;

        pub const TIMESTAMPING_NEW = 65;

        pub const RCVTIMEO_NEW = 66;

        pub const SNDTIMEO_NEW = 67;

        pub const DETACH_REUSEPORT_BPF = 68;
    };
};

pub const SCM = struct {

    pub const WIFI_STATUS = SO.WIFI_STATUS;

    pub const TIMESTAMPING_OPT_STATS = 54;

    pub const TIMESTAMPING_PKTINFO = 58;

    pub const TXTIME = SO.TXTIME;
};

pub const SOL = struct {

    pub const SOCKET = if (is_mips or is_sparc) 65535 else 1;

    pub const IP = 0;

    pub const IPV6 = 41;

    pub const ICMPV6 = 58;

    pub const RAW = 255;
    pub const DECNET = 261;
    pub const X25 = 262;

    pub const PACKET = 263;

    pub const ATM = 264;

    pub const AAL = 265;

    pub const IRDA = 266;

    pub const NETBEUI = 267;

    pub const LLC = 268;

    pub const DCCP = 269;

    pub const NETLINK = 270;

    pub const TIPC = 271;

    pub const RXRPC = 272;

    pub const PPPOL2TP = 273;

    pub const BLUETOOTH = 274;

    pub const PNPIPE = 275;

    pub const RDS = 276;

    pub const IUCV = 277;

    pub const CAIF = 278;

    pub const ALG = 279;

    pub const NFC = 280;

    pub const KCM = 281;

    pub const TLS = 282;

    pub const XDP = 283;
};

pub const SOMAXCONN = 128;

pub const IP = struct {

    pub const TOS = 1;

    pub const TTL = 2;

    pub const HDRINCL = 3;

    pub const OPTIONS = 4;

    pub const ROUTER_ALERT = 5;

    pub const RECVOPTS = 6;

    pub const RETOPTS = 7;

    pub const PKTINFO = 8;

    pub const PKTOPTIONS = 9;

    pub const PMTUDISC = 10;

    pub const MTU_DISCOVER = 10;

    pub const RECVERR = 11;

    pub const RECVTTL = 12;

    pub const RECVTOS = 13;

    pub const MTU = 14;

    pub const FREEBIND = 15;

    pub const IPSEC_POLICY = 16;

    pub const XFRM_POLICY = 17;

    pub const PASSSEC = 18;

    pub const TRANSPARENT = 19;

    pub const ORIGDSTADDR = 20;

    pub const RECVORIGDSTADDR = IP.ORIGDSTADDR;

    pub const MINTTL = 21;

    pub const NODEFRAG = 22;

    pub const CHECKSUM = 23;

    pub const BIND_ADDRESS_NO_PORT = 24;

    pub const RECVFRAGSIZE = 25;

    pub const MULTICAST_IF = 32;

    pub const MULTICAST_TTL = 33;

    pub const MULTICAST_LOOP = 34;

    pub const ADD_MEMBERSHIP = 35;

    pub const DROP_MEMBERSHIP = 36;

    pub const UNBLOCK_SOURCE = 37;

    pub const BLOCK_SOURCE = 38;

    pub const ADD_SOURCE_MEMBERSHIP = 39;

    pub const DROP_SOURCE_MEMBERSHIP = 40;

    pub const MSFILTER = 41;

    pub const MULTICAST_ALL = 49;

    pub const UNICAST_IF = 50;

    pub const RECVRETOPTS = IP.RETOPTS;

    pub const PMTUDISC_DONT = 0;

    pub const PMTUDISC_WANT = 1;

    pub const PMTUDISC_DO = 2;

    pub const PMTUDISC_PROBE = 3;

    pub const PMTUDISC_INTERFACE = 4;

    pub const PMTUDISC_OMIT = 5;

    pub const DEFAULT_MULTICAST_TTL = 1;
    pub const DEFAULT_MULTICAST_LOOP = 1;

    pub const MAX_MEMBERSHIPS = 20;
};

/// IPv6 socket options
pub const IPV6 = struct {

    pub const ADDRFORM = 1;

    pub const @"2292PKTINFO" = 2;

    pub const @"2292HOPOPTS" = 3;

    pub const @"2292DSTOPTS" = 4;

    pub const @"2292RTHDR" = 5;

    pub const @"2292PKTOPTIONS" = 6;

    pub const CHECKSUM = 7;

    pub const @"2292HOPLIMIT" = 8;

    pub const NEXTHOP = 9;

    pub const AUTHHDR = 10;

    pub const FLOWINFO = 11;

    pub const UNICAST_HOPS = 16;

    pub const MULTICAST_IF = 17;

    pub const MULTICAST_HOPS = 18;

    pub const MULTICAST_LOOP = 19;

    pub const ADD_MEMBERSHIP = 20;

    pub const DROP_MEMBERSHIP = 21;

    pub const ROUTER_ALERT = 22;

    pub const MTU_DISCOVER = 23;

    pub const MTU = 24;

    pub const RECVERR = 25;

    pub const V6ONLY = 26;

    pub const JOIN_ANYCAST = 27;

    pub const LEAVE_ANYCAST = 28;

    // IPV6.MTU_DISCOVER values
    pub const PMTUDISC_DONT = 0;

    pub const PMTUDISC_WANT = 1;

    pub const PMTUDISC_DO = 2;

    pub const PMTUDISC_PROBE = 3;

    pub const PMTUDISC_INTERFACE = 4;

    pub const PMTUDISC_OMIT = 5;

    // Flowlabel
    pub const FLOWLABEL_MGR = 32;

    pub const FLOWINFO_SEND = 33;

    pub const IPSEC_POLICY = 34;

    pub const XFRM_POLICY = 35;

    pub const HDRINCL = 36;

    // Advanced API (RFC3542) (1)
    pub const RECVPKTINFO = 49;

    pub const PKTINFO = 50;

    pub const RECVHOPLIMIT = 51;

    pub const HOPLIMIT = 52;

    pub const RECVHOPOPTS = 53;

    pub const HOPOPTS = 54;

    pub const RTHDRDSTOPTS = 55;

    pub const RECVRTHDR = 56;

    pub const RTHDR = 57;

    pub const RECVDSTOPTS = 58;

    pub const DSTOPTS = 59;

    pub const RECVPATHMTU = 60;

    pub const PATHMTU = 61;

    pub const DONTFRAG = 62;

    // Advanced API (RFC3542) (2)
    pub const RECVTCLASS = 66;

    pub const TCLASS = 67;

    pub const AUTOFLOWLABEL = 70;

    // RFC5014: Source address selection
    pub const ADDR_PREFERENCES = 72;

    pub const PREFER_SRC_TMP = 0x0001;

    pub const PREFER_SRC_PUBLIC = 0x0002;

    pub const PREFER_SRC_PUBTMP_DEFAULT = 0x0100;

    pub const PREFER_SRC_COA = 0x0004;

    pub const PREFER_SRC_HOME = 0x0400;

    pub const PREFER_SRC_CGA = 0x0008;

    pub const PREFER_SRC_NONCGA = 0x0800;

    // RFC5082: Generalized Ttl Security Mechanism
    pub const MINHOPCOUNT = 73;

    pub const ORIGDSTADDR = 74;

    pub const RECVORIGDSTADDR = IPV6.ORIGDSTADDR;

    pub const TRANSPARENT = 75;

    pub const UNICAST_IF = 76;

    pub const RECVFRAGSIZE = 77;

    pub const FREEBIND = 78;
};

pub const MSG = struct {

    pub const OOB = 0x0001;

    pub const PEEK = 0x0002;

    pub const DONTROUTE = 0x0004;

    pub const CTRUNC = 0x0008;

    pub const PROXY = 0x0010;

    pub const TRUNC = 0x0020;

    pub const DONTWAIT = 0x0040;

    pub const EOR = 0x0080;

    pub const WAITALL = 0x0100;

    pub const FIN = 0x0200;

    pub const SYN = 0x0400;

    pub const CONFIRM = 0x0800;

    pub const RST = 0x1000;

    pub const ERRQUEUE = 0x2000;

    pub const NOSIGNAL = 0x4000;

    pub const MORE = 0x8000;

    pub const WAITFORONE = 0x10000;

    pub const BATCH = 0x40000;

    pub const ZEROCOPY = 0x4000000;

    pub const FASTOPEN = 0x20000000;

    pub const CMSG_CLOEXEC = 0x40000000;
};

pub const DT = struct {

    pub const UNKNOWN = 0;

    pub const FIFO = 1;

    pub const CHR = 2;

    pub const DIR = 4;

    pub const BLK = 6;

    pub const REG = 8;

    pub const LNK = 10;

    pub const SOCK = 12;

    pub const WHT = 14;
};

pub const T = struct {

    pub const CGETS = if (is_mips) 0x540D else 0x5401;

    pub const CSETS = if (is_mips) 0x540e else 0x5402;

    pub const CSETSW = if (is_mips) 0x540f else 0x5403;

    pub const CSETSF = if (is_mips) 0x5410 else 0x5404;

    pub const CGETA = if (is_mips) 0x5401 else 0x5405;

    pub const CSETA = if (is_mips) 0x5402 else 0x5406;

    pub const CSETAW = if (is_mips) 0x5403 else 0x5407;

    pub const CSETAF = if (is_mips) 0x5404 else 0x5408;

    pub const CSBRK = if (is_mips) 0x5405 else 0x5409;

    pub const CXONC = if (is_mips) 0x5406 else 0x540A;

    pub const CFLSH = if (is_mips) 0x5407 else 0x540B;

    pub const IOCEXCL = if (is_mips) 0x740d else 0x540C;

    pub const IOCNXCL = if (is_mips) 0x740e else 0x540D;

    pub const IOCSCTTY = if (is_mips) 0x7472 else 0x540E;

    pub const IOCGPGRP = if (is_mips) 0x5472 else 0x540F;

    pub const IOCSPGRP = if (is_mips) 0x741d else 0x5410;

    pub const IOCOUTQ = if (is_mips) 0x7472 else 0x5411;

    pub const IOCSTI = if (is_mips) 0x5472 else 0x5412;

    pub const IOCGWINSZ = if (is_mips or is_ppc64) 0x40087468 else 0x5413;

    pub const IOCSWINSZ = if (is_mips or is_ppc64) 0x80087467 else 0x5414;

    pub const IOCMGET = if (is_mips) 0x741d else 0x5415;

    pub const IOCMBIS = if (is_mips) 0x741b else 0x5416;

    pub const IOCMBIC = if (is_mips) 0x741c else 0x5417;

    pub const IOCMSET = if (is_mips) 0x741a else 0x5418;

    pub const IOCGSOFTCAR = if (is_mips) 0x5481 else 0x5419;

    pub const IOCSSOFTCAR = if (is_mips) 0x5482 else 0x541A;

    pub const FIONREAD = if (is_mips) 0x467F else 0x541B;

    pub const IOCINQ = FIONREAD;

    pub const IOCLINUX = if (is_mips) 0x5483 else 0x541C;

    pub const IOCCONS = if (is_mips) IOCTL.IOW('t', 120, c_int) else 0x541D;

    pub const IOCGSERIAL = if (is_mips) 0x5484 else 0x541E;

    pub const IOCSSERIAL = if (is_mips) 0x5485 else 0x541F;

    pub const IOCPKT = if (is_mips) 0x5470 else 0x5420;

    pub const FIONBIO = if (is_mips) 0x667e else 0x5421;

    pub const IOCNOTTY = if (is_mips) 0x5471 else 0x5422;

    pub const IOCSETD = if (is_mips) 0x7401 else 0x5423;

    pub const IOCGETD = if (is_mips) 0x7400 else 0x5424;

    pub const CSBRKP = if (is_mips) 0x5486 else 0x5425;

    pub const IOCSBRK = 0x5427;

    pub const IOCCBRK = 0x5428;

    pub const IOCGSID = if (is_mips) 0x7416 else 0x5429;

    pub const IOCGRS485 = 0x542E;

    pub const IOCSRS485 = 0x542F;

    pub const IOCGPTN = IOCTL.IOR('T', 0x30, c_uint);

    pub const IOCSPTLCK = IOCTL.IOW('T', 0x31, c_int);

    pub const IOCGDEV = IOCTL.IOR('T', 0x32, c_uint);

    pub const CGETX = 0x5432;

    pub const CSETX = 0x5433;

    pub const CSETXF = 0x5434;

    pub const CSETXW = 0x5435;

    pub const IOCSIG = IOCTL.IOW('T', 0x36, c_int);

    pub const IOCVHANGUP = 0x5437;

    pub const IOCGPKT = IOCTL.IOR('T', 0x38, c_int);

    pub const IOCGPTLCK = IOCTL.IOR('T', 0x39, c_int);

    pub const IOCGEXCL = IOCTL.IOR('T', 0x40, c_int);
};

pub const EPOLL = struct {

    pub const CLOEXEC = O.CLOEXEC;

    pub const CTL_ADD = 1;

    pub const CTL_DEL = 2;

    pub const CTL_MOD = 3;

    pub const IN = 0x001;

    pub const PRI = 0x002;

    pub const OUT = 0x004;

    pub const RDNORM = 0x040;

    pub const RDBAND = 0x080;
    pub const WRNORM = if (is_mips) 0x004 else 0x100;

    pub const WRBAND = if (is_mips) 0x100 else 0x200;

    pub const MSG = 0x400;

    pub const ERR = 0x008;

    pub const HUP = 0x010;

    pub const RDHUP = 0x2000;

    pub const EXCLUSIVE = (@as(u32, 1) << 28);

    pub const WAKEUP = (@as(u32, 1) << 29);

    pub const ONESHOT = (@as(u32, 1) << 30);

    pub const ET = (@as(u32, 1) << 31);
};

pub const CLOCK = struct {

    pub const REALTIME = 0;

    pub const MONOTONIC = 1;

    pub const PROCESS_CPUTIME_ID = 2;

    pub const THREAD_CPUTIME_ID = 3;

    pub const MONOTONIC_RAW = 4;

    pub const REALTIME_COARSE = 5;

    pub const MONOTONIC_COARSE = 6;

    pub const BOOTTIME = 7;

    pub const REALTIME_ALARM = 8;

    pub const BOOTTIME_ALARM = 9;

    pub const SGI_CYCLE = 10;

    pub const TAI = 11;
};

pub const CSIGNAL = 0x000000ff;

pub const CLONE = struct {

    pub const VM = 0x00000100;

    pub const FS = 0x00000200;

    pub const FILES = 0x00000400;

    pub const SIGHAND = 0x00000800;

    pub const PIDFD = 0x00001000;

    pub const PTRACE = 0x00002000;

    pub const VFORK = 0x00004000;

    pub const PARENT = 0x00008000;

    pub const THREAD = 0x00010000;

    pub const NEWNS = 0x00020000;

    pub const SYSVSEM = 0x00040000;

    pub const SETTLS = 0x00080000;

    pub const PARENT_SETTID = 0x00100000;

    pub const CHILD_CLEARTID = 0x00200000;

    pub const DETACHED = 0x00400000;

    pub const UNTRACED = 0x00800000;

    pub const CHILD_SETTID = 0x01000000;

    pub const NEWCGROUP = 0x02000000;

    pub const NEWUTS = 0x04000000;

    pub const NEWIPC = 0x08000000;

    pub const NEWUSER = 0x10000000;

    pub const NEWPID = 0x20000000;

    pub const NEWNET = 0x40000000;

    pub const IO = 0x80000000;

    // Flags for the clone3() syscall.

    /// Clear any signal handler and reset to SIG_DFL.
    pub const CLEAR_SIGHAND = 0x100000000;
    /// Clone into a specific cgroup given the right permissions.
    pub const INTO_CGROUP = 0x200000000;

    // cloning flags intersect with CSIGNAL so can be used with unshare and clone3 syscalls only.

    /// New time namespace
    pub const NEWTIME = 0x00000080;
};

pub const EFD = struct {
    pub const SEMAPHORE = 1;

    pub const CLOEXEC = O.CLOEXEC;

    pub const NONBLOCK = O.NONBLOCK;
};

pub const MS = struct {

    pub const RDONLY = 1;

    pub const NOSUID = 2;

    pub const NODEV = 4;

    pub const NOEXEC = 8;

    pub const SYNCHRONOUS = 16;

    pub const REMOUNT = 32;

    pub const MANDLOCK = 64;

    pub const DIRSYNC = 128;

    pub const NOATIME = 1024;

    pub const NODIRATIME = 2048;

    pub const BIND = 4096;

    pub const MOVE = 8192;

    pub const REC = 16384;

    pub const SILENT = 32768;

    pub const POSIXACL = (1 << 16);

    pub const UNBINDABLE = (1 << 17);

    pub const PRIVATE = (1 << 18);

    pub const SLAVE = (1 << 19);

    pub const SHARED = (1 << 20);

    pub const RELATIME = (1 << 21);

    pub const KERNMOUNT = (1 << 22);

    pub const I_VERSION = (1 << 23);

    pub const STRICTATIME = (1 << 24);

    pub const LAZYTIME = (1 << 25);

    pub const NOREMOTELOCK = (1 << 27);

    pub const NOSEC = (1 << 28);

    pub const BORN = (1 << 29);

    pub const ACTIVE = (1 << 30);

    pub const NOUSER = (1 << 31);

    pub const RMT_MASK = (RDONLY | SYNCHRONOUS | MANDLOCK | I_VERSION | LAZYTIME);

    pub const MGC_VAL = 0xc0ed0000;

    pub const MGC_MSK = 0xffff0000;
};

pub const MNT = struct {

    pub const FORCE = 1;

    pub const DETACH = 2;

    pub const EXPIRE = 4;
};

pub const UMOUNT_NOFOLLOW = 8;

pub const IN = struct {

    pub const CLOEXEC = O.CLOEXEC;

    pub const NONBLOCK = O.NONBLOCK;

    pub const ACCESS = 0x00000001;

    pub const MODIFY = 0x00000002;

    pub const ATTRIB = 0x00000004;

    pub const CLOSE_WRITE = 0x00000008;

    pub const CLOSE_NOWRITE = 0x00000010;

    pub const CLOSE = CLOSE_WRITE | CLOSE_NOWRITE;

    pub const OPEN = 0x00000020;

    pub const MOVED_FROM = 0x00000040;

    pub const MOVED_TO = 0x00000080;

    pub const MOVE = MOVED_FROM | MOVED_TO;

    pub const CREATE = 0x00000100;

    pub const DELETE = 0x00000200;

    pub const DELETE_SELF = 0x00000400;

    pub const MOVE_SELF = 0x00000800;

    pub const ALL_EVENTS = 0x00000fff;

    pub const UNMOUNT = 0x00002000;

    pub const Q_OVERFLOW = 0x00004000;

    pub const IGNORED = 0x00008000;

    pub const ONLYDIR = 0x01000000;

    pub const DONT_FOLLOW = 0x02000000;

    pub const EXCL_UNLINK = 0x04000000;

    pub const MASK_CREATE = 0x10000000;

    pub const MASK_ADD = 0x20000000;

    pub const ISDIR = 0x40000000;

    pub const ONESHOT = 0x80000000;
};

pub const S = struct {

    pub const IFMT = 0o170000;

    pub const IFDIR = 0o040000;

    pub const IFCHR = 0o020000;

    pub const IFBLK = 0o060000;

    pub const IFREG = 0o100000;

    pub const IFIFO = 0o010000;

    pub const IFLNK = 0o120000;

    pub const IFSOCK = 0o140000;

    pub const ISUID = 0o4000;

    pub const ISGID = 0o2000;

    pub const ISVTX = 0o1000;

    pub const IRUSR = 0o400;

    pub const IWUSR = 0o200;

    pub const IXUSR = 0o100;

    pub const IRWXU = 0o700;

    pub const IRGRP = 0o040;

    pub const IWGRP = 0o020;

    pub const IXGRP = 0o010;

    pub const IRWXG = 0o070;

    pub const IROTH = 0o004;

    pub const IWOTH = 0o002;

    pub const IXOTH = 0o001;

    pub const IRWXO = 0o007;

    pub fn ISREG(m: mode_t) bool {
        return m & IFMT == IFREG;
    }

    pub fn ISDIR(m: mode_t) bool {
        return m & IFMT == IFDIR;
    }

    pub fn ISCHR(m: mode_t) bool {
        return m & IFMT == IFCHR;
    }

    pub fn ISBLK(m: mode_t) bool {
        return m & IFMT == IFBLK;
    }

    pub fn ISFIFO(m: mode_t) bool {
        return m & IFMT == IFIFO;
    }

    pub fn ISLNK(m: mode_t) bool {
        return m & IFMT == IFLNK;
    }

    pub fn ISSOCK(m: mode_t) bool {
        return m & IFMT == IFSOCK;
    }
};

pub const UTIME = struct {

    pub const NOW = 0x3fffffff;

    pub const OMIT = 0x3ffffffe;
};

pub const TFD = struct {

    pub const NONBLOCK = O.NONBLOCK;

    pub const CLOEXEC = O.CLOEXEC;

    pub const TIMER_ABSTIME = 1;

    pub const TIMER_CANCEL_ON_SET = (1 << 1);
};

pub const winsize = extern struct {
    ws_row: u16,
    ws_col: u16,
    ws_xpixel: u16,
    ws_ypixel: u16,
};

/// NSIG is the total number of signals defined.
/// As signal numbers are sequential, NSIG is one greater than the largest defined signal number.
pub const NSIG = if (is_mips) 128 else 65;

pub const sigset_t = [1024 / 32]u32;

pub const all_mask: sigset_t = [_]u32{0xffffffff} ** @typeInfo(sigset_t).Array.len;

pub const app_mask: sigset_t = [2]u32{ 0xfffffffc, 0x7fffffff } ++ [_]u32{0xffffffff} ** 30;

const k_sigaction_funcs = struct {
    const handler = ?*const fn (c_int) align(1) callconv(.C) void;
    const restorer = *const fn () callconv(.C) void;
};

pub const k_sigaction = switch (native_arch) {
    .mips, .mipsel => extern struct {
        flags: c_uint,
        handler: k_sigaction_funcs.handler,
        mask: [4]c_ulong,
        restorer: k_sigaction_funcs.restorer,
    },
    .mips64, .mips64el => extern struct {
        flags: c_uint,
        handler: k_sigaction_funcs.handler,
        mask: [2]c_ulong,
        restorer: k_sigaction_funcs.restorer,
    },
    else => extern struct {
        handler: k_sigaction_funcs.handler,
        flags: c_ulong,
        restorer: k_sigaction_funcs.restorer,
        mask: [2]c_uint,
    },
};

/// Renamed from `sigaction` to `Sigaction` to avoid conflict with the syscall.
pub const Sigaction = extern struct {
    pub const handler_fn = *const fn (c_int) align(1) callconv(.C) void;

    pub const sigaction_fn = *const fn (c_int, *const siginfo_t, ?*const anyopaque) callconv(.C) void;

    handler: extern union {
        handler: ?handler_fn,
        sigaction: ?sigaction_fn,
    },
    mask: sigset_t,
    flags: c_uint,
    restorer: ?*const fn () callconv(.C) void = null,
};

pub const empty_sigset = [_]u32{0} ** @typeInfo(sigset_t).Array.len;

pub const SFD = struct {
    pub const CLOEXEC = O.CLOEXEC;

    pub const NONBLOCK = O.NONBLOCK;
};

pub const signalfd_siginfo = extern struct {
    signo: u32,
    errno: i32,
    code: i32,
    pid: u32,
    uid: uid_t,
    fd: i32,
    tid: u32,
    band: u32,
    overrun: u32,
    trapno: u32,
    status: i32,
    int: i32,
    ptr: u64,
    utime: u64,
    stime: u64,
    addr: u64,
    addr_lsb: u16,
    __pad2: u16,
    syscall: i32,
    call_addr: u64,
    native_arch: u32,
    __pad: [28]u8,
};

pub const in_port_t = u16;

pub const sa_family_t = u16;

pub const socklen_t = u32;

pub const sockaddr = extern struct {
    family: sa_family_t,
    data: [14]u8,

    pub const SS_MAXSIZE = 128;

    pub const storage = extern struct {
        family: sa_family_t align(8),
        padding: [SS_MAXSIZE - @sizeOf(sa_family_t)]u8 = undefined,

        comptime {
            assert(@sizeOf(storage) == SS_MAXSIZE);
            assert(@alignOf(storage) == 8);
        }
    };

    /// IPv4 socket address
    pub const in = extern struct {
        family: sa_family_t = AF.INET,
        port: in_port_t,
        addr: u32,
        zero: [8]u8 = [8]u8{ 0, 0, 0, 0, 0, 0, 0, 0 },
    };

    /// IPv6 socket address
    pub const in6 = extern struct {
        family: sa_family_t = AF.INET6,
        port: in_port_t,
        flowinfo: u32,
        addr: [16]u8,
        scope_id: u32,
    };

    /// UNIX domain socket address
    pub const un = extern struct {
        family: sa_family_t = AF.UNIX,
        path: [108]u8,
    };

    /// Packet socket address
    pub const ll = extern struct {
        family: sa_family_t = AF.PACKET,
        protocol: u16,
        ifindex: i32,
        hatype: u16,
        pkttype: u8,
        halen: u8,
        addr: [8]u8,
    };

    /// Netlink socket address
    pub const nl = extern struct {
        family: sa_family_t = AF.NETLINK,
        __pad1: c_ushort = 0,

        /// port ID
        pid: u32,

        /// multicast groups mask
        groups: u32,
    };

    pub const xdp = extern struct {
        family: u16 = AF.XDP,
        flags: u16,
        ifindex: u32,
        queue_id: u32,
        shared_umem_fd: u32,
    };

    /// Address structure for vSockets
    pub const vm = extern struct {
        family: sa_family_t = AF.VSOCK,
        reserved1: u16 = 0,
        port: u32,
        cid: u32,
        flags: u8,

        /// The total size of this structure should be exactly the same as that of struct sockaddr.
        zero: [3]u8 = [_]u8{0} ** 3,
        comptime {
            std.debug.assert(@sizeOf(vm) == @sizeOf(sockaddr));
        }
    };
};

pub const mmsghdr = extern struct {
    msg_hdr: msghdr,
    msg_len: u32,
};

pub const mmsghdr_const = extern struct {
    msg_hdr: msghdr_const,
    msg_len: u32,
};

pub const epoll_data = extern union {
    ptr: usize,
    fd: i32,
    u32: u32,
    u64: u64,
};

pub const epoll_event = extern struct {
    events: u32,
    data: epoll_data align(switch (native_arch) {
        .x86_64 => 4,
        else => @alignOf(epoll_data),
    }),
};

pub const VFS_CAP_REVISION_MASK = 0xFF000000;
pub const VFS_CAP_REVISION_SHIFT = 24;
pub const VFS_CAP_FLAGS_MASK = ~VFS_CAP_REVISION_MASK;
pub const VFS_CAP_FLAGS_EFFECTIVE = 0x000001;

pub const VFS_CAP_REVISION_1 = 0x01000000;
pub const VFS_CAP_U32_1 = 1;

pub const XATTR_CAPS_SZ_1 = @sizeOf(u32) * (1 + 2 * VFS_CAP_U32_1);

pub const VFS_CAP_REVISION_2 = 0x02000000;

pub const VFS_CAP_U32_2 = 2;

pub const XATTR_CAPS_SZ_2 = @sizeOf(u32) * (1 + 2 * VFS_CAP_U32_2);

pub const XATTR_CAPS_SZ = XATTR_CAPS_SZ_2;

pub const VFS_CAP_U32 = VFS_CAP_U32_2;

pub const VFS_CAP_REVISION = VFS_CAP_REVISION_2;

pub const vfs_cap_data = extern struct {
    //all of these are mandated as little endian
    //when on disk.
    const Data = struct {
        permitted: u32,
        inheritable: u32,
    };

    magic_etc: u32,
    data: [VFS_CAP_U32]Data,
};

pub const CAP = struct {
    pub const CHOWN = 0;

    pub const DAC_OVERRIDE = 1;

    pub const DAC_READ_SEARCH = 2;

    pub const FOWNER = 3;

    pub const FSETID = 4;

    pub const KILL = 5;

    pub const SETGID = 6;

    pub const SETUID = 7;

    pub const SETPCAP = 8;

    pub const LINUX_IMMUTABLE = 9;

    pub const NET_BIND_SERVICE = 10;

    pub const NET_BROADCAST = 11;

    pub const NET_ADMIN = 12;

    pub const NET_RAW = 13;

    pub const IPC_LOCK = 14;

    pub const IPC_OWNER = 15;

    pub const SYS_MODULE = 16;

    pub const SYS_RAWIO = 17;

    pub const SYS_CHROOT = 18;

    pub const SYS_PTRACE = 19;

    pub const SYS_PACCT = 20;

    pub const SYS_ADMIN = 21;

    pub const SYS_BOOT = 22;

    pub const SYS_NICE = 23;

    pub const SYS_RESOURCE = 24;

    pub const SYS_TIME = 25;

    pub const SYS_TTY_CONFIG = 26;

    pub const MKNOD = 27;

    pub const LEASE = 28;

    pub const AUDIT_WRITE = 29;

    pub const AUDIT_CONTROL = 30;

    pub const SETFCAP = 31;

    pub const MAC_OVERRIDE = 32;

    pub const MAC_ADMIN = 33;

    pub const SYSLOG = 34;

    pub const WAKE_ALARM = 35;

    pub const BLOCK_SUSPEND = 36;

    pub const AUDIT_READ = 37;

    pub const PERFMON = 38;

    pub const BPF = 39;

    pub const CHECKPOINT_RESTORE = 40;

    pub const LAST_CAP = CHECKPOINT_RESTORE;

    pub fn valid(x: u8) bool {
        return x >= 0 and x <= LAST_CAP;
    }

    pub fn TO_MASK(cap: u8) u32 {
        return @as(u32, 1) << @as(u5, @intCast(cap & 31));
    }

    pub fn TO_INDEX(cap: u8) u8 {
        return cap >> 5;
    }
};

pub const cap_t = extern struct {
    hdrp: *cap_user_header_t,
    datap: *cap_user_data_t,
};

pub const cap_user_header_t = extern struct {
    version: u32,
    pid: usize,
};

pub const cap_user_data_t = extern struct {
    effective: u32,
    permitted: u32,
    inheritable: u32,
};

pub const inotify_event = extern struct {
    wd: i32,
    mask: u32,
    cookie: u32,
    len: u32,
    //name: [?]u8,
};

pub const dirent64 = extern struct {
    d_ino: u64,
    d_off: u64,
    d_reclen: u16,
    d_type: u8,
    d_name: u8, // field address is the address of first byte of name https://github.com/ziglang/zig/issues/173

    pub fn reclen(self: dirent64) u16 {
        return self.d_reclen;
    }
};

pub const dl_phdr_info = extern struct {
    dlpi_addr: usize,
    dlpi_name: ?[*:0]const u8,
    dlpi_phdr: [*]std.elf.Phdr,
    dlpi_phnum: u16,
};

pub const CPU_SETSIZE = 128;

pub const cpu_set_t = [CPU_SETSIZE / @sizeOf(usize)]usize;

pub const cpu_count_t = std.meta.Int(.unsigned, std.math.log2(CPU_SETSIZE * 8));

pub fn CPU_COUNT(set: cpu_set_t) cpu_count_t {
    var sum: cpu_count_t = 0;
    for (set) |x| {
        sum += @popCount(x);
    }
    return sum;
}

pub const MINSIGSTKSZ = switch (native_arch) {
    .x86, .x86_64, .arm, .mipsel => 2048,
    .aarch64 => 5120,
    else => @compileError("MINSIGSTKSZ not defined for this architecture"),
};

pub const SIGSTKSZ = switch (native_arch) {
    .x86, .x86_64, .arm, .mipsel => 8192,
    .aarch64 => 16384,
    else => @compileError("SIGSTKSZ not defined for this architecture"),
};

pub const SS_ONSTACK = 1;

pub const SS_DISABLE = 2;

pub const SS_AUTODISARM = 1 << 31;

pub const stack_t = if (is_mips)
    // IRIX compatible stack_t
    extern struct {
        sp: [*]u8,
        size: usize,
        flags: i32,
    }

else
    extern struct {
        sp: [*]u8,
        flags: i32,
        size: usize,
    };

pub const sigval = extern union {
    int: i32,
    ptr: *anyopaque,
};

const siginfo_fields_union = extern union {
    pad: [128 - 2 * @sizeOf(c_int) - @sizeOf(c_long)]u8,
    common: extern struct {
        first: extern union {
            piduid: extern struct {
                pid: pid_t,
                uid: uid_t,
            },
            timer: extern struct {
                timerid: i32,
                overrun: i32,
            },
        },
        second: extern union {
            value: sigval,
            sigchld: extern struct {
                status: i32,
                utime: clock_t,
                stime: clock_t,
            },
        },
    },
    sigfault: extern struct {
        addr: *anyopaque,
        addr_lsb: i16,
        first: extern union {
            addr_bnd: extern struct {
                lower: *anyopaque,
                upper: *anyopaque,
            },
            pkey: u32,
        },
    },
    sigpoll: extern struct {
        band: isize,
        fd: i32,
    },
    sigsys: extern struct {
        call_addr: *anyopaque,
        syscall: i32,
        native_arch: u32,
    },
};

pub const siginfo_t = if (is_mips)
    extern struct {
        signo: i32,
        code: i32,
        errno: i32,
        fields: siginfo_fields_union,
    }

else
    extern struct {
        signo: i32,
        errno: i32,
        code: i32,
        fields: siginfo_fields_union,
    };

pub const io_uring_params = extern struct {
    sq_entries: u32,
    cq_entries: u32,
    flags: u32,
    sq_thread_cpu: u32,
    sq_thread_idle: u32,
    features: u32,
    wq_fd: u32,
    resv: [3]u32,
    sq_off: io_sqring_offsets,
    cq_off: io_cqring_offsets,
};

// io_uring_params.features flags

pub const IORING_FEAT_SINGLE_MMAP = 1 << 0;
pub const IORING_FEAT_NODROP = 1 << 1;
pub const IORING_FEAT_SUBMIT_STABLE = 1 << 2;
pub const IORING_FEAT_RW_CUR_POS = 1 << 3;
pub const IORING_FEAT_CUR_PERSONALITY = 1 << 4;

pub const IORING_FEAT_FAST_POLL = 1 << 5;

pub const IORING_FEAT_POLL_32BITS = 1 << 6;

pub const IORING_FEAT_SQPOLL_NONFIXED = 1 << 7;

pub const IORING_FEAT_EXT_ARG = 1 << 8;

pub const IORING_FEAT_NATIVE_WORKERS = 1 << 9;

pub const IORING_FEAT_RSRC_TAGS = 1 << 10;

pub const IORING_FEAT_CQE_SKIP = 1 << 11;

pub const IORING_FEAT_LINKED_FILE = 1 << 12;

// io_uring_params.flags

/// io_context is polled
pub const IORING_SETUP_IOPOLL = 1 << 0;

/// SQ poll thread
pub const IORING_SETUP_SQPOLL = 1 << 1;

/// sq_thread_cpu is valid
pub const IORING_SETUP_SQ_AFF = 1 << 2;

/// app defines CQ size
pub const IORING_SETUP_CQSIZE = 1 << 3;

/// clamp SQ/CQ ring sizes
pub const IORING_SETUP_CLAMP = 1 << 4;

/// attach to existing wq
pub const IORING_SETUP_ATTACH_WQ = 1 << 5;

/// start with ring disabled
pub const IORING_SETUP_R_DISABLED = 1 << 6;

/// continue submit on error
pub const IORING_SETUP_SUBMIT_ALL = 1 << 7;

/// Cooperative task running. When requests complete, they often require
/// forcing the submitter to transition to the kernel to complete. If this
/// flag is set, work will be done when the task transitions anyway, rather
/// than force an inter-processor interrupt reschedule. This avoids interrupting
/// a task running in userspace, and saves an IPI.
pub const IORING_SETUP_COOP_TASKRUN = 1 << 8;

/// If COOP_TASKRUN is set, get notified if task work is available for
/// running and a kernel transition would be needed to run it. This sets
/// IORING_SQ_TASKRUN in the sq ring flags. Not valid with COOP_TASKRUN.
pub const IORING_SETUP_TASKRUN_FLAG = 1 << 9;

/// SQEs are 128 byte
pub const IORING_SETUP_SQE128 = 1 << 10;
/// CQEs are 32 byte
pub const IORING_SETUP_CQE32 = 1 << 11;

pub const io_sqring_offsets = extern struct {
    /// offset of ring head
    head: u32,

    /// offset of ring tail
    tail: u32,

    /// ring mask value
    ring_mask: u32,

    /// entries in ring
    ring_entries: u32,

    /// ring flags
    flags: u32,

    /// number of sqes not submitted
    dropped: u32,

    /// sqe index array
    array: u32,

    resv1: u32,
    resv2: u64,
};

// io_sqring_offsets.flags

/// needs io_uring_enter wakeup
pub const IORING_SQ_NEED_WAKEUP = 1 << 0;
/// kernel has cqes waiting beyond the cq ring
pub const IORING_SQ_CQ_OVERFLOW = 1 << 1;
/// task should enter the kernel
pub const IORING_SQ_TASKRUN = 1 << 2;

pub const io_cqring_offsets = extern struct {
    head: u32,
    tail: u32,
    ring_mask: u32,
    ring_entries: u32,
    overflow: u32,
    cqes: u32,
    resv: [2]u64,
};

pub const io_uring_sqe = extern struct {
    opcode: IORING_OP,
    flags: u8,
    ioprio: u16,
    fd: i32,
    off: u64,
    addr: u64,
    len: u32,
    rw_flags: u32,
    user_data: u64,
    buf_index: u16,
    personality: u16,
    splice_fd_in: i32,
    __pad2: [2]u64,
};

pub const IOSQE_BIT = enum(u8) {
    FIXED_FILE,
    IO_DRAIN,
    IO_LINK,
    IO_HARDLINK,
    ASYNC,
    BUFFER_SELECT,
    CQE_SKIP_SUCCESS,

    _,
};

// io_uring_sqe.flags

/// use fixed fileset
pub const IOSQE_FIXED_FILE = 1 << @intFromEnum(IOSQE_BIT.FIXED_FILE);

/// issue after inflight IO
pub const IOSQE_IO_DRAIN = 1 << @intFromEnum(IOSQE_BIT.IO_DRAIN);

/// links next sqe
pub const IOSQE_IO_LINK = 1 << @intFromEnum(IOSQE_BIT.IO_LINK);

/// like LINK, but stronger
pub const IOSQE_IO_HARDLINK = 1 << @intFromEnum(IOSQE_BIT.IO_HARDLINK);

/// always go async
pub const IOSQE_ASYNC = 1 << @intFromEnum(IOSQE_BIT.ASYNC);

/// select buffer from buf_group
pub const IOSQE_BUFFER_SELECT = 1 << @intFromEnum(IOSQE_BIT.BUFFER_SELECT);

/// don't post CQE if request succeeded
/// Available since Linux 5.17
pub const IOSQE_CQE_SKIP_SUCCESS = 1 << @intFromEnum(IOSQE_BIT.CQE_SKIP_SUCCESS);

pub const IORING_OP = enum(u8) {
    NOP,
    READV,
    WRITEV,
    FSYNC,
    READ_FIXED,
    WRITE_FIXED,
    POLL_ADD,
    POLL_REMOVE,
    SYNC_FILE_RANGE,
    SENDMSG,
    RECVMSG,
    TIMEOUT,
    TIMEOUT_REMOVE,
    ACCEPT,
    ASYNC_CANCEL,
    LINK_TIMEOUT,
    CONNECT,
    FALLOCATE,
    OPENAT,
    CLOSE,
    FILES_UPDATE,
    STATX,
    READ,
    WRITE,
    FADVISE,
    MADVISE,
    SEND,
    RECV,
    OPENAT2,
    EPOLL_CTL,
    SPLICE,
    PROVIDE_BUFFERS,
    REMOVE_BUFFERS,
    TEE,
    SHUTDOWN,
    RENAMEAT,
    UNLINKAT,
    MKDIRAT,
    SYMLINKAT,
    LINKAT,

    _,
};

// io_uring_sqe.fsync_flags (rw_flags in the Zig struct)
pub const IORING_FSYNC_DATASYNC = 1 << 0;

// io_uring_sqe.timeout_flags (rw_flags in the Zig struct)
pub const IORING_TIMEOUT_ABS = 1 << 0;
pub const IORING_TIMEOUT_UPDATE = 1 << 1; // Available since Linux 5.11
pub const IORING_TIMEOUT_BOOTTIME = 1 << 2; // Available since Linux 5.15
pub const IORING_TIMEOUT_REALTIME = 1 << 3; // Available since Linux 5.15
pub const IORING_LINK_TIMEOUT_UPDATE = 1 << 4; // Available since Linux 5.15
pub const IORING_TIMEOUT_ETIME_SUCCESS = 1 << 5; // Available since Linux 5.16
pub const IORING_TIMEOUT_CLOCK_MASK = IORING_TIMEOUT_BOOTTIME | IORING_TIMEOUT_REALTIME;
pub const IORING_TIMEOUT_UPDATE_MASK = IORING_TIMEOUT_UPDATE | IORING_LINK_TIMEOUT_UPDATE;

// io_uring_sqe.splice_flags (rw_flags in the Zig struct)
// extends splice(2) flags
pub const IORING_SPLICE_F_FD_IN_FIXED = 1 << 31;

// POLL_ADD flags.
// Note that since sqe->poll_events (rw_flags in the Zig struct) is the flag space, the command flags for POLL_ADD are stored in sqe->len.

/// Multishot poll. Sets IORING_CQE_F_MORE if the poll handler will continue to report CQEs on behalf of the same SQE.
pub const IORING_POLL_ADD_MULTI = 1 << 0;
/// Update existing poll request, matching sqe->addr as the old user_data field.
pub const IORING_POLL_UPDATE_EVENTS = 1 << 1;
pub const IORING_POLL_UPDATE_USER_DATA = 1 << 2;

// ASYNC_CANCEL flags.

/// Cancel all requests that match the given key
pub const IORING_ASYNC_CANCEL_ALL = 1 << 0;
/// Key off 'fd' for cancelation rather than the request 'user_data'.
pub const IORING_ASYNC_CANCEL_FD = 1 << 1;
/// Match any request
pub const IORING_ASYNC_CANCEL_ANY = 1 << 2;

// send/sendmsg and recv/recvmsg flags (sqe->ioprio)

/// If set, instead of first attempting to send or receive and arm poll if that yields an -EAGAIN result,
/// arm poll upfront and skip the initial transfer attempt.
pub const IORING_RECVSEND_POLL_FIRST = 1 << 0;
/// Multishot recv. Sets IORING_CQE_F_MORE if the handler will continue to report CQEs on behalf of the same SQE.
pub const IORING_RECV_MULTISHOT = 1 << 1;

/// accept flags stored in sqe->ioprio
pub const IORING_ACCEPT_MULTISHOT = 1 << 0;

// IO completion data structure (Completion Queue Entry)
pub const io_uring_cqe = extern struct {
    /// io_uring_sqe.data submission passed back
    user_data: u64,

    /// result code for this event
    res: i32,
    flags: u32,

    pub fn err(self: io_uring_cqe) E {
        if (self.res > -4096 and self.res < 0) {
            return @as(E, @enumFromInt(-self.res));
        }
        return .SUCCESS;
    }
};

// io_uring_cqe.flags

/// If set, the upper 16 bits are the buffer ID
pub const IORING_CQE_F_BUFFER = 1 << 0;
/// If set, parent SQE will generate more CQE entries.
/// Available since Linux 5.13.
pub const IORING_CQE_F_MORE = 1 << 1;
/// If set, more data to read after socket recv
pub const IORING_CQE_F_SOCK_NONEMPTY = 1 << 2;
/// Set for notification CQEs. Can be used to distinct them from sends.

pub const IORING_CQE_F_NOTIF = 1 << 3;