    // wasi_snapshot_preview1 spec available (in witx format) here:

    // * typenames -- https://github.com/WebAssembly/WASI/blob/master/phases/snapshot/witx/typenames.witx

    // * module -- https://github.com/WebAssembly/WASI/blob/master/phases/snapshot/witx/wasi_snapshot_preview1.witx

    const std = @import("std");
    const assert = std.debug.assert;

    comptime {
        assert(@alignOf(i8) == 1);
        assert(@alignOf(u8) == 1);
        assert(@alignOf(i16) == 2);
        assert(@alignOf(u16) == 2);
        assert(@alignOf(i32) == 4);
        assert(@alignOf(u32) == 4);
        // assert(@alignOf(i64) == 8);

        // assert(@alignOf(u64) == 8);

    }

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

    pub const iovec_t = std.os.iovec;
    pub const ciovec_t = std.os.iovec_const;

    pub extern "wasi_snapshot_preview1" fn args_get(argv: [*][*:0]u8, argv_buf: [*]u8) errno_t;
    pub extern "wasi_snapshot_preview1" fn args_sizes_get(argc: *usize, argv_buf_size: *usize) errno_t;

    pub extern "wasi_snapshot_preview1" fn clock_res_get(clock_id: clockid_t, resolution: *timestamp_t) errno_t;
    pub extern "wasi_snapshot_preview1" fn clock_time_get(clock_id: clockid_t, precision: timestamp_t, timestamp: *timestamp_t) errno_t;

    pub extern "wasi_snapshot_preview1" fn environ_get(environ: [*][*:0]u8, environ_buf: [*]u8) errno_t;
    pub extern "wasi_snapshot_preview1" fn environ_sizes_get(environ_count: *usize, environ_buf_size: *usize) errno_t;

    pub extern "wasi_snapshot_preview1" fn fd_advise(fd: fd_t, offset: filesize_t, len: filesize_t, advice: advice_t) errno_t;
    pub extern "wasi_snapshot_preview1" fn fd_allocate(fd: fd_t, offset: filesize_t, len: filesize_t) errno_t;
    pub extern "wasi_snapshot_preview1" fn fd_close(fd: fd_t) errno_t;
    pub extern "wasi_snapshot_preview1" fn fd_datasync(fd: fd_t) errno_t;
    pub extern "wasi_snapshot_preview1" fn fd_pread(fd: fd_t, iovs: [*]const iovec_t, iovs_len: usize, offset: filesize_t, nread: *usize) errno_t;
    pub extern "wasi_snapshot_preview1" fn fd_pwrite(fd: fd_t, iovs: [*]const ciovec_t, iovs_len: usize, offset: filesize_t, nwritten: *usize) errno_t;
    pub extern "wasi_snapshot_preview1" fn fd_read(fd: fd_t, iovs: [*]const iovec_t, iovs_len: usize, nread: *usize) errno_t;
    pub extern "wasi_snapshot_preview1" fn fd_readdir(fd: fd_t, buf: [*]u8, buf_len: usize, cookie: dircookie_t, bufused: *usize) errno_t;
    pub extern "wasi_snapshot_preview1" fn fd_renumber(from: fd_t, to: fd_t) errno_t;
    pub extern "wasi_snapshot_preview1" fn fd_seek(fd: fd_t, offset: filedelta_t, whence: whence_t, newoffset: *filesize_t) errno_t;
    pub extern "wasi_snapshot_preview1" fn fd_sync(fd: fd_t) errno_t;
    pub extern "wasi_snapshot_preview1" fn fd_tell(fd: fd_t, newoffset: *filesize_t) errno_t;
    pub extern "wasi_snapshot_preview1" fn fd_write(fd: fd_t, iovs: [*]const ciovec_t, iovs_len: usize, nwritten: *usize) errno_t;

    pub extern "wasi_snapshot_preview1" fn fd_fdstat_get(fd: fd_t, buf: *fdstat_t) errno_t;
    pub extern "wasi_snapshot_preview1" fn fd_fdstat_set_flags(fd: fd_t, flags: fdflags_t) errno_t;
    pub extern "wasi_snapshot_preview1" fn fd_fdstat_set_rights(fd: fd_t, fs_rights_base: rights_t, fs_rights_inheriting: rights_t) errno_t;

    pub extern "wasi_snapshot_preview1" fn fd_filestat_get(fd: fd_t, buf: *filestat_t) errno_t;
    pub extern "wasi_snapshot_preview1" fn fd_filestat_set_size(fd: fd_t, st_size: filesize_t) errno_t;
    pub extern "wasi_snapshot_preview1" fn fd_filestat_set_times(fd: fd_t, st_atim: timestamp_t, st_mtim: timestamp_t, fstflags: fstflags_t) errno_t;

    pub extern "wasi_snapshot_preview1" fn fd_prestat_get(fd: fd_t, buf: *prestat_t) errno_t;
    pub extern "wasi_snapshot_preview1" fn fd_prestat_dir_name(fd: fd_t, path: [*]u8, path_len: usize) errno_t;

    pub extern "wasi_snapshot_preview1" fn path_create_directory(fd: fd_t, path: [*]const u8, path_len: usize) errno_t;
    pub extern "wasi_snapshot_preview1" fn path_filestat_get(fd: fd_t, flags: lookupflags_t, path: [*]const u8, path_len: usize, buf: *filestat_t) errno_t;
    pub extern "wasi_snapshot_preview1" fn path_filestat_set_times(fd: fd_t, flags: lookupflags_t, path: [*]const u8, path_len: usize, st_atim: timestamp_t, st_mtim: timestamp_t, fstflags: fstflags_t) errno_t;
    pub extern "wasi_snapshot_preview1" fn path_link(old_fd: fd_t, old_flags: lookupflags_t, old_path: [*]const u8, old_path_len: usize, new_fd: fd_t, new_path: [*]const u8, new_path_len: usize) errno_t;
    pub extern "wasi_snapshot_preview1" fn path_open(dirfd: fd_t, dirflags: lookupflags_t, path: [*]const u8, path_len: usize, oflags: oflags_t, fs_rights_base: rights_t, fs_rights_inheriting: rights_t, fs_flags: fdflags_t, fd: *fd_t) errno_t;
    pub extern "wasi_snapshot_preview1" fn path_readlink(fd: fd_t, path: [*]const u8, path_len: usize, buf: [*]u8, buf_len: usize, bufused: *usize) errno_t;
    pub extern "wasi_snapshot_preview1" fn path_remove_directory(fd: fd_t, path: [*]const u8, path_len: usize) errno_t;
    pub extern "wasi_snapshot_preview1" fn path_rename(old_fd: fd_t, old_path: [*]const u8, old_path_len: usize, new_fd: fd_t, new_path: [*]const u8, new_path_len: usize) errno_t;
    pub extern "wasi_snapshot_preview1" fn path_symlink(old_path: [*]const u8, old_path_len: usize, fd: fd_t, new_path: [*]const u8, new_path_len: usize) errno_t;
    pub extern "wasi_snapshot_preview1" fn path_unlink_file(fd: fd_t, path: [*]const u8, path_len: usize) errno_t;

    pub extern "wasi_snapshot_preview1" fn poll_oneoff(in: *const subscription_t, out: *event_t, nsubscriptions: usize, nevents: *usize) errno_t;

    pub extern "wasi_snapshot_preview1" fn proc_exit(rval: exitcode_t) noreturn;

    pub extern "wasi_snapshot_preview1" fn random_get(buf: [*]u8, buf_len: usize) errno_t;

    pub extern "wasi_snapshot_preview1" fn sched_yield() errno_t;

    pub extern "wasi_snapshot_preview1" fn sock_accept(sock: fd_t, flags: fdflags_t, result_fd: *fd_t) errno_t;
    pub extern "wasi_snapshot_preview1" fn sock_recv(sock: fd_t, ri_data: *const iovec_t, ri_data_len: usize, ri_flags: riflags_t, ro_datalen: *usize, ro_flags: *roflags_t) errno_t;
    pub extern "wasi_snapshot_preview1" fn sock_send(sock: fd_t, si_data: *const ciovec_t, si_data_len: usize, si_flags: siflags_t, so_datalen: *usize) errno_t;
    pub extern "wasi_snapshot_preview1" fn sock_shutdown(sock: fd_t, how: sdflags_t) errno_t;

    /// Get the errno from a syscall return value, or 0 for no error.
    pub fn getErrno(r: errno_t) errno_t {
        return r;
    }

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

    pub const mode_t = u32;

    pub const time_t = i64; // match https://github.com/CraneStation/wasi-libc

    pub const timespec = extern struct {
        tv_sec: time_t,
        tv_nsec: isize,

        pub fn fromTimestamp(tm: timestamp_t) timespec {
            const tv_sec: timestamp_t = tm / 1_000_000_000;
            const tv_nsec = tm - tv_sec * 1_000_000_000;
            return timespec{
                .tv_sec = @intCast(time_t, tv_sec),
                .tv_nsec = @intCast(isize, tv_nsec),
            };
        }

        pub fn toTimestamp(ts: timespec) timestamp_t {
            const tm = @intCast(timestamp_t, ts.tv_sec * 1_000_000_000) + @intCast(timestamp_t, ts.tv_nsec);
            return tm;
        }
    };

    pub const Stat = struct {
        dev: device_t,
        ino: inode_t,
        mode: mode_t,
        filetype: filetype_t,
        nlink: linkcount_t,
        size: filesize_t,
        atim: timespec,
        mtim: timespec,
        ctim: timespec,

        const Self = @This();

        pub fn fromFilestat(stat: filestat_t) Self {
            return Self{
                .dev = stat.dev,
                .ino = stat.ino,
                .mode = 0,
                .filetype = stat.filetype,
                .nlink = stat.nlink,
                .size = stat.size,
                .atim = stat.atime(),
                .mtim = stat.mtime(),
                .ctim = stat.ctime(),
            };
        }

        pub fn atime(self: Self) timespec {
            return self.atim;
        }

        pub fn mtime(self: Self) timespec {
            return self.mtim;
        }

        pub fn ctime(self: Self) timespec {
            return self.ctim;
        }
    };

    pub const IOV_MAX = 1024;

    pub const AT = struct {
        pub const REMOVEDIR: u32 = 0x4;
        pub const FDCWD: fd_t = -2;
    };

    // As defined in the wasi_snapshot_preview1 spec file:

    // https://github.com/WebAssembly/WASI/blob/master/phases/snapshot/witx/typenames.witx

    pub const advice_t = u8;
    pub const ADVICE_NORMAL: advice_t = 0;
    pub const ADVICE_SEQUENTIAL: advice_t = 1;
    pub const ADVICE_RANDOM: advice_t = 2;
    pub const ADVICE_WILLNEED: advice_t = 3;
    pub const ADVICE_DONTNEED: advice_t = 4;
    pub const ADVICE_NOREUSE: advice_t = 5;

    pub const clockid_t = u32;
    pub const CLOCK = struct {
        pub const REALTIME: clockid_t = 0;
        pub const MONOTONIC: clockid_t = 1;
        pub const PROCESS_CPUTIME_ID: clockid_t = 2;
        pub const THREAD_CPUTIME_ID: clockid_t = 3;
    };

    pub const device_t = u64;

    pub const dircookie_t = u64;
    pub const DIRCOOKIE_START: dircookie_t = 0;

    pub const dirnamlen_t = u32;

    pub const dirent_t = extern struct {
        d_next: dircookie_t,
        d_ino: inode_t,
        d_namlen: dirnamlen_t,
        d_type: filetype_t,
    };

    pub const errno_t = enum(u16) {
        SUCCESS = 0,
        @"2BIG" = 1,
        ACCES = 2,
        ADDRINUSE = 3,
        ADDRNOTAVAIL = 4,
        AFNOSUPPORT = 5,
        /// This is also the error code used for `WOULDBLOCK`.
        AGAIN = 6,
        ALREADY = 7,
        BADF = 8,
        BADMSG = 9,
        BUSY = 10,
        CANCELED = 11,
        CHILD = 12,
        CONNABORTED = 13,
        CONNREFUSED = 14,
        CONNRESET = 15,
        DEADLK = 16,
        DESTADDRREQ = 17,
        DOM = 18,
        DQUOT = 19,
        EXIST = 20,
        FAULT = 21,
        FBIG = 22,
        HOSTUNREACH = 23,
        IDRM = 24,
        ILSEQ = 25,
        INPROGRESS = 26,
        INTR = 27,
        INVAL = 28,
        IO = 29,
        ISCONN = 30,
        ISDIR = 31,
        LOOP = 32,
        MFILE = 33,
        MLINK = 34,
        MSGSIZE = 35,
        MULTIHOP = 36,
        NAMETOOLONG = 37,
        NETDOWN = 38,
        NETRESET = 39,
        NETUNREACH = 40,
        NFILE = 41,
        NOBUFS = 42,
        NODEV = 43,
        NOENT = 44,
        NOEXEC = 45,
        NOLCK = 46,
        NOLINK = 47,
        NOMEM = 48,
        NOMSG = 49,
        NOPROTOOPT = 50,
        NOSPC = 51,
        NOSYS = 52,
        NOTCONN = 53,
        NOTDIR = 54,
        NOTEMPTY = 55,
        NOTRECOVERABLE = 56,
        NOTSOCK = 57,
        /// This is also the code used for `NOTSUP`.
        OPNOTSUPP = 58,
        NOTTY = 59,
        NXIO = 60,
        OVERFLOW = 61,
        OWNERDEAD = 62,
        PERM = 63,
        PIPE = 64,
        PROTO = 65,
        PROTONOSUPPORT = 66,
        PROTOTYPE = 67,
        RANGE = 68,
        ROFS = 69,
        SPIPE = 70,
        SRCH = 71,
        STALE = 72,
        TIMEDOUT = 73,
        TXTBSY = 74,
        XDEV = 75,
        NOTCAPABLE = 76,
        _,
    };
    pub const E = errno_t;

    pub const event_t = extern struct {
        userdata: userdata_t,
        @"error": errno_t,
        @"type": eventtype_t,
        fd_readwrite: eventfdreadwrite_t,
    };

    pub const eventfdreadwrite_t = extern struct {
        nbytes: filesize_t,
        flags: eventrwflags_t,
    };

    pub const eventrwflags_t = u16;
    pub const EVENT_FD_READWRITE_HANGUP: eventrwflags_t = 0x0001;

    pub const eventtype_t = u8;
    pub const EVENTTYPE_CLOCK: eventtype_t = 0;
    pub const EVENTTYPE_FD_READ: eventtype_t = 1;
    pub const EVENTTYPE_FD_WRITE: eventtype_t = 2;

    pub const exitcode_t = u32;

    pub const fd_t = i32;

    pub const fdflags_t = u16;
    pub const FDFLAG = struct {
        pub const APPEND: fdflags_t = 0x0001;
        pub const DSYNC: fdflags_t = 0x0002;
        pub const NONBLOCK: fdflags_t = 0x0004;
        pub const RSYNC: fdflags_t = 0x0008;
        pub const SYNC: fdflags_t = 0x0010;
    };

    pub const fdstat_t = extern struct {
        fs_filetype: filetype_t,
        fs_flags: fdflags_t,
        fs_rights_base: rights_t,
        fs_rights_inheriting: rights_t,
    };

    pub const filedelta_t = i64;

    pub const filesize_t = u64;

    pub const filestat_t = extern struct {
        dev: device_t,
        ino: inode_t,
        filetype: filetype_t,
        nlink: linkcount_t,
        size: filesize_t,
        atim: timestamp_t,
        mtim: timestamp_t,
        ctim: timestamp_t,

        pub fn atime(self: filestat_t) timespec {
            return timespec.fromTimestamp(self.atim);
        }

        pub fn mtime(self: filestat_t) timespec {
            return timespec.fromTimestamp(self.mtim);
        }

        pub fn ctime(self: filestat_t) timespec {
            return timespec.fromTimestamp(self.ctim);
        }
    };

    /// Also known as `FILETYPE`.
    pub const filetype_t = enum(u8) {
        UNKNOWN,
        BLOCK_DEVICE,
        CHARACTER_DEVICE,
        DIRECTORY,
        REGULAR_FILE,
        SOCKET_DGRAM,
        SOCKET_STREAM,
        SYMBOLIC_LINK,
        _,
    };

    pub const fstflags_t = u16;
    pub const FILESTAT_SET_ATIM: fstflags_t = 0x0001;
    pub const FILESTAT_SET_ATIM_NOW: fstflags_t = 0x0002;
    pub const FILESTAT_SET_MTIM: fstflags_t = 0x0004;
    pub const FILESTAT_SET_MTIM_NOW: fstflags_t = 0x0008;

    pub const inode_t = u64;
    pub const ino_t = inode_t;

    pub const linkcount_t = u64;

    pub const lookupflags_t = u32;
    pub const LOOKUP_SYMLINK_FOLLOW: lookupflags_t = 0x00000001;

    pub const oflags_t = u16;
    pub const O = struct {
        pub const CREAT: oflags_t = 0x0001;
        pub const DIRECTORY: oflags_t = 0x0002;
        pub const EXCL: oflags_t = 0x0004;
        pub const TRUNC: oflags_t = 0x0008;
    };

    pub const preopentype_t = u8;
    pub const PREOPENTYPE_DIR: preopentype_t = 0;

    pub const prestat_t = extern struct {
        pr_type: preopentype_t,
        u: prestat_u_t,
    };

    pub const prestat_dir_t = extern struct {
        pr_name_len: usize,
    };

    pub const prestat_u_t = extern union {
        dir: prestat_dir_t,
    };

    pub const riflags_t = u16;
    pub const roflags_t = u16;

    pub const SOCK = struct {
        pub const RECV_PEEK: riflags_t = 0x0001;
        pub const RECV_WAITALL: riflags_t = 0x0002;

        pub const RECV_DATA_TRUNCATED: roflags_t = 0x0001;
    };

    pub const rights_t = u64;
    pub const RIGHT = struct {
        pub const FD_DATASYNC: rights_t = 0x0000000000000001;
        pub const FD_READ: rights_t = 0x0000000000000002;
        pub const FD_SEEK: rights_t = 0x0000000000000004;
        pub const FD_FDSTAT_SET_FLAGS: rights_t = 0x0000000000000008;
        pub const FD_SYNC: rights_t = 0x0000000000000010;
        pub const FD_TELL: rights_t = 0x0000000000000020;
        pub const FD_WRITE: rights_t = 0x0000000000000040;
        pub const FD_ADVISE: rights_t = 0x0000000000000080;
        pub const FD_ALLOCATE: rights_t = 0x0000000000000100;
        pub const PATH_CREATE_DIRECTORY: rights_t = 0x0000000000000200;
        pub const PATH_CREATE_FILE: rights_t = 0x0000000000000400;
        pub const PATH_LINK_SOURCE: rights_t = 0x0000000000000800;
        pub const PATH_LINK_TARGET: rights_t = 0x0000000000001000;
        pub const PATH_OPEN: rights_t = 0x0000000000002000;
        pub const FD_READDIR: rights_t = 0x0000000000004000;
        pub const PATH_READLINK: rights_t = 0x0000000000008000;
        pub const PATH_RENAME_SOURCE: rights_t = 0x0000000000010000;
        pub const PATH_RENAME_TARGET: rights_t = 0x0000000000020000;
        pub const PATH_FILESTAT_GET: rights_t = 0x0000000000040000;
        pub const PATH_FILESTAT_SET_SIZE: rights_t = 0x0000000000080000;
        pub const PATH_FILESTAT_SET_TIMES: rights_t = 0x0000000000100000;
        pub const FD_FILESTAT_GET: rights_t = 0x0000000000200000;
        pub const FD_FILESTAT_SET_SIZE: rights_t = 0x0000000000400000;
        pub const FD_FILESTAT_SET_TIMES: rights_t = 0x0000000000800000;
        pub const PATH_SYMLINK: rights_t = 0x0000000001000000;
        pub const PATH_REMOVE_DIRECTORY: rights_t = 0x0000000002000000;
        pub const PATH_UNLINK_FILE: rights_t = 0x0000000004000000;
        pub const POLL_FD_READWRITE: rights_t = 0x0000000008000000;
        pub const SOCK_SHUTDOWN: rights_t = 0x0000000010000000;
        pub const SOCK_ACCEPT: rights_t = 0x0000000020000000;
        pub const ALL: rights_t = FD_DATASYNC |
            FD_READ |
            FD_SEEK |
            FD_FDSTAT_SET_FLAGS |
            FD_SYNC |
            FD_TELL |
            FD_WRITE |
            FD_ADVISE |
            FD_ALLOCATE |
            PATH_CREATE_DIRECTORY |
            PATH_CREATE_FILE |
            PATH_LINK_SOURCE |
            PATH_LINK_TARGET |
            PATH_OPEN |
            FD_READDIR |
            PATH_READLINK |
            PATH_RENAME_SOURCE |
            PATH_RENAME_TARGET |
            PATH_FILESTAT_GET |
            PATH_FILESTAT_SET_SIZE |
            PATH_FILESTAT_SET_TIMES |
            FD_FILESTAT_GET |
            FD_FILESTAT_SET_SIZE |
            FD_FILESTAT_SET_TIMES |
            PATH_SYMLINK |
            PATH_REMOVE_DIRECTORY |
            PATH_UNLINK_FILE |
            POLL_FD_READWRITE |
            SOCK_SHUTDOWN |
            SOCK_ACCEPT;
    };

    pub const sdflags_t = u8;
    pub const SHUT = struct {
        pub const RD: sdflags_t = 0x01;
        pub const WR: sdflags_t = 0x02;
    };

    pub const siflags_t = u16;

    pub const signal_t = u8;
    pub const SIGNONE: signal_t = 0;
    pub const SIGHUP: signal_t = 1;
    pub const SIGINT: signal_t = 2;
    pub const SIGQUIT: signal_t = 3;
    pub const SIGILL: signal_t = 4;
    pub const SIGTRAP: signal_t = 5;
    pub const SIGABRT: signal_t = 6;
    pub const SIGBUS: signal_t = 7;
    pub const SIGFPE: signal_t = 8;
    pub const SIGKILL: signal_t = 9;
    pub const SIGUSR1: signal_t = 10;
    pub const SIGSEGV: signal_t = 11;
    pub const SIGUSR2: signal_t = 12;
    pub const SIGPIPE: signal_t = 13;
    pub const SIGALRM: signal_t = 14;
    pub const SIGTERM: signal_t = 15;
    pub const SIGCHLD: signal_t = 16;
    pub const SIGCONT: signal_t = 17;
    pub const SIGSTOP: signal_t = 18;
    pub const SIGTSTP: signal_t = 19;
    pub const SIGTTIN: signal_t = 20;
    pub const SIGTTOU: signal_t = 21;
    pub const SIGURG: signal_t = 22;
    pub const SIGXCPU: signal_t = 23;
    pub const SIGXFSZ: signal_t = 24;
    pub const SIGVTALRM: signal_t = 25;
    pub const SIGPROF: signal_t = 26;
    pub const SIGWINCH: signal_t = 27;
    pub const SIGPOLL: signal_t = 28;
    pub const SIGPWR: signal_t = 29;
    pub const SIGSYS: signal_t = 30;

    pub const subclockflags_t = u16;
    pub const SUBSCRIPTION_CLOCK_ABSTIME: subclockflags_t = 0x0001;

    pub const subscription_t = extern struct {
        userdata: userdata_t,
        u: subscription_u_t,
    };

    pub const subscription_clock_t = extern struct {
        id: clockid_t,
        timeout: timestamp_t,
        precision: timestamp_t,
        flags: subclockflags_t,
    };

    pub const subscription_fd_readwrite_t = extern struct {
        fd: fd_t,
    };

    pub const subscription_u_t = extern struct {
        tag: eventtype_t,
        u: subscription_u_u_t,
    };

    pub const subscription_u_u_t = extern union {
        clock: subscription_clock_t,
        fd_read: subscription_fd_readwrite_t,
        fd_write: subscription_fd_readwrite_t,
    };

    pub const timestamp_t = u64;

    pub const userdata_t = u64;

    /// Also known as `WHENCE`.
    pub const whence_t = enum(u8) { SET, CUR, END };

    pub const S = struct {
        pub const IEXEC = @compileError("TODO audit this");
        pub const IFBLK = 0x6000;
        pub const IFCHR = 0x2000;
        pub const IFDIR = 0x4000;
        pub const IFIFO = 0xc000;
        pub const IFLNK = 0xa000;
        pub const IFMT = IFBLK | IFCHR | IFDIR | IFIFO | IFLNK | IFREG | IFSOCK;
        pub const IFREG = 0x8000;
        // There's no concept of UNIX domain socket but we define this value here in order to line with other OSes.

        pub const IFSOCK = 0x1;
    };

    pub const LOCK = struct {
        pub const SH = 0x1;
        pub const EX = 0x2;
        pub const NB = 0x4;
        pub const UN = 0x8;
    };