// SPDX-License-Identifier: MIT
// Copyright (c) 2015-2020 Zig Contributors
// This file is part of [zig](https://ziglang.org/), which is MIT licensed.
// The MIT license requires this copyright notice to be included in all copies
// and substantial portions of the software.
const std = @import("../../std.zig");
const maxInt = std.math.maxInt;

pub fn S_ISCHR(m: u32) bool {
    return m & S_IFMT == S_IFCHR;
}

// See:
// - https://gitweb.dragonflybsd.org/dragonfly.git/blob/HEAD:/include/unistd.h
// - https://gitweb.dragonflybsd.org/dragonfly.git/blob/HEAD:/sys/sys/types.h
// TODO: mode_t should probably be changed to a u16, audit pid_t/off_t as well
pub const fd_t = c_int;
pub const pid_t = c_int;
pub const off_t = c_long;
pub const mode_t = c_uint;
pub const uid_t = u32;
pub const gid_t = u32;

pub const ENOTSUP = EOPNOTSUPP;
pub const EWOULDBLOCK = EAGAIN;
pub const EPERM = 1;
pub const ENOENT = 2;
pub const ESRCH = 3;
pub const EINTR = 4;
pub const EIO = 5;
pub const ENXIO = 6;
pub const E2BIG = 7;
pub const ENOEXEC = 8;
pub const EBADF = 9;
pub const ECHILD = 10;
pub const EDEADLK = 11;
pub const ENOMEM = 12;
pub const EACCES = 13;
pub const EFAULT = 14;
pub const ENOTBLK = 15;
pub const EBUSY = 16;
pub const EEXIST = 17;
pub const EXDEV = 18;
pub const ENODEV = 19;
pub const ENOTDIR = 20;
pub const EISDIR = 21;
pub const EINVAL = 22;
pub const ENFILE = 23;
pub const EMFILE = 24;
pub const ENOTTY = 25;
pub const ETXTBSY = 26;
pub const EFBIG = 27;
pub const ENOSPC = 28;
pub const ESPIPE = 29;
pub const EROFS = 30;
pub const EMLINK = 31;
pub const EPIPE = 32;
pub const EDOM = 33;
pub const ERANGE = 34;
pub const EAGAIN = 35;
pub const EINPROGRESS = 36;
pub const EALREADY = 37;
pub const ENOTSOCK = 38;
pub const EDESTADDRREQ = 39;
pub const EMSGSIZE = 40;
pub const EPROTOTYPE = 41;
pub const ENOPROTOOPT = 42;
pub const EPROTONOSUPPORT = 43;
pub const ESOCKTNOSUPPORT = 44;
pub const EOPNOTSUPP = 45;
pub const EPFNOSUPPORT = 46;
pub const EAFNOSUPPORT = 47;
pub const EADDRINUSE = 48;
pub const EADDRNOTAVAIL = 49;
pub const ENETDOWN = 50;
pub const ENETUNREACH = 51;
pub const ENETRESET = 52;
pub const ECONNABORTED = 53;
pub const ECONNRESET = 54;
pub const ENOBUFS = 55;
pub const EISCONN = 56;
pub const ENOTCONN = 57;
pub const ESHUTDOWN = 58;
pub const ETOOMANYREFS = 59;
pub const ETIMEDOUT = 60;
pub const ECONNREFUSED = 61;
pub const ELOOP = 62;
pub const ENAMETOOLONG = 63;
pub const EHOSTDOWN = 64;
pub const EHOSTUNREACH = 65;
pub const ENOTEMPTY = 66;
pub const EPROCLIM = 67;
pub const EUSERS = 68;
pub const EDQUOT = 69;
pub const ESTALE = 70;
pub const EREMOTE = 71;
pub const EBADRPC = 72;
pub const ERPCMISMATCH = 73;
pub const EPROGUNAVAIL = 74;
pub const EPROGMISMATCH = 75;
pub const EPROCUNAVAIL = 76;
pub const ENOLCK = 77;
pub const ENOSYS = 78;
pub const EFTYPE = 79;
pub const EAUTH = 80;
pub const ENEEDAUTH = 81;
pub const EIDRM = 82;
pub const ENOMSG = 83;
pub const EOVERFLOW = 84;
pub const ECANCELED = 85;
pub const EILSEQ = 86;
pub const ENOATTR = 87;
pub const EDOOFUS = 88;
pub const EBADMSG = 89;
pub const EMULTIHOP = 90;
pub const ENOLINK = 91;
pub const EPROTO = 92;
pub const ENOMEDIUM = 93;
pub const ELAST = 99;
pub const EASYNC = 99;

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

pub const PROT_NONE = 0;
pub const PROT_READ = 1;
pub const PROT_WRITE = 2;
pub const PROT_EXEC = 4;

pub const MAP_FILE = 0;
pub const MAP_FAILED = @intToPtr(*c_void, maxInt(usize));
pub const MAP_ANONYMOUS = MAP_ANON;
pub const MAP_COPY = MAP_PRIVATE;
pub const MAP_SHARED = 1;
pub const MAP_PRIVATE = 2;
pub const MAP_FIXED = 16;
pub const MAP_RENAME = 32;
pub const MAP_NORESERVE = 64;
pub const MAP_INHERIT = 128;
pub const MAP_NOEXTEND = 256;
pub const MAP_HASSEMAPHORE = 512;
pub const MAP_STACK = 1024;
pub const MAP_NOSYNC = 2048;
pub const MAP_ANON = 4096;
pub const MAP_VPAGETABLE = 8192;
pub const MAP_TRYFIXED = 65536;
pub const MAP_NOCORE = 131072;
pub const MAP_SIZEALIGN = 262144;

pub const PATH_MAX = 1024;

pub const ino_t = c_ulong;

pub const libc_stat = extern struct {
    ino: ino_t,
    nlink: c_uint,
    dev: c_uint,
    mode: c_ushort,
    padding1: u16,
    uid: uid_t,
    gid: gid_t,
    rdev: c_uint,
    atim: timespec,
    mtim: timespec,
    ctim: timespec,
    size: c_ulong,
    blocks: i64,
    blksize: u32,
    flags: u32,
    gen: u32,
    lspare: i32,
    qspare1: i64,
    qspare2: i64,
    pub fn atime(self: @This()) timespec {
        return self.atim;
    }

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

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

pub const timespec = extern struct {
    tv_sec: c_long,
    tv_nsec: c_long,
};

pub const CTL_UNSPEC = 0;
pub const CTL_KERN = 1;
pub const CTL_VM = 2;
pub const CTL_VFS = 3;
pub const CTL_NET = 4;
pub const CTL_DEBUG = 5;
pub const CTL_HW = 6;
pub const CTL_MACHDEP = 7;
pub const CTL_USER = 8;
pub const CTL_LWKT = 10;
pub const CTL_MAXID = 11;
pub const CTL_MAXNAME = 12;

pub const KERN_PROC_ALL = 0;
pub const KERN_OSTYPE = 1;
pub const KERN_PROC_PID = 1;
pub const KERN_OSRELEASE = 2;
pub const KERN_PROC_PGRP = 2;
pub const KERN_OSREV = 3;
pub const KERN_PROC_SESSION = 3;
pub const KERN_VERSION = 4;
pub const KERN_PROC_TTY = 4;
pub const KERN_MAXVNODES = 5;
pub const KERN_PROC_UID = 5;
pub const KERN_MAXPROC = 6;
pub const KERN_PROC_RUID = 6;
pub const KERN_MAXFILES = 7;
pub const KERN_PROC_ARGS = 7;
pub const KERN_ARGMAX = 8;
pub const KERN_PROC_CWD = 8;
pub const KERN_PROC_PATHNAME = 9;
pub const KERN_SECURELVL = 9;
pub const KERN_PROC_SIGTRAMP = 10;
pub const KERN_HOSTNAME = 10;
pub const KERN_HOSTID = 11;
pub const KERN_CLOCKRATE = 12;
pub const KERN_VNODE = 13;
pub const KERN_PROC = 14;
pub const KERN_FILE = 15;
pub const KERN_PROC_FLAGMASK = 16;
pub const KERN_PROF = 16;
pub const KERN_PROC_FLAG_LWP = 16;
pub const KERN_POSIX1 = 17;
pub const KERN_NGROUPS = 18;
pub const KERN_JOB_CONTROL = 19;
pub const KERN_SAVED_IDS = 20;
pub const KERN_BOOTTIME = 21;
pub const KERN_NISDOMAINNAME = 22;
pub const KERN_UPDATEINTERVAL = 23;
pub const KERN_OSRELDATE = 24;
pub const KERN_NTP_PLL = 25;
pub const KERN_BOOTFILE = 26;
pub const KERN_MAXFILESPERPROC = 27;
pub const KERN_MAXPROCPERUID = 28;
pub const KERN_DUMPDEV = 29;
pub const KERN_IPC = 30;
pub const KERN_DUMMY = 31;
pub const KERN_PS_STRINGS = 32;
pub const KERN_USRSTACK = 33;
pub const KERN_LOGSIGEXIT = 34;
pub const KERN_IOV_MAX = 35;
pub const KERN_MAXPOSIXLOCKSPERUID = 36;
pub const KERN_MAXID = 37;

pub const HOST_NAME_MAX = 255;

// access function
pub const F_OK = 0; // test for existence of file
pub const X_OK = 1; // test for execute or search permission
pub const W_OK = 2; // test for write permission
pub const R_OK = 4; // test for read permission

pub const O_RDONLY = 0;
pub const O_NDELAY = O_NONBLOCK;
pub const O_WRONLY = 1;
pub const O_RDWR = 2;
pub const O_ACCMODE = 3;
pub const O_NONBLOCK = 4;
pub const O_APPEND = 8;
pub const O_SHLOCK = 16;
pub const O_EXLOCK = 32;
pub const O_ASYNC = 64;
pub const O_FSYNC = 128;
pub const O_SYNC = 128;
pub const O_NOFOLLOW = 256;
pub const O_CREAT = 512;
pub const O_TRUNC = 1024;
pub const O_EXCL = 2048;
pub const O_NOCTTY = 32768;
pub const O_DIRECT = 65536;
pub const O_CLOEXEC = 131072;
pub const O_FBLOCKING = 262144;
pub const O_FNONBLOCKING = 524288;
pub const O_FAPPEND = 1048576;
pub const O_FOFFSET = 2097152;
pub const O_FSYNCWRITE = 4194304;
pub const O_FASYNCWRITE = 8388608;
pub const O_DIRECTORY = 134217728;

pub const SEEK_SET = 0;
pub const SEEK_CUR = 1;
pub const SEEK_END = 2;
pub const SEEK_DATA = 3;
pub const SEEK_HOLE = 4;

pub const F_ULOCK = 0;
pub const F_LOCK = 1;
pub const F_TLOCK = 2;
pub const F_TEST = 3;

pub const FD_CLOEXEC = 1;

pub const AT_FDCWD = -328243;
pub const AT_SYMLINK_NOFOLLOW = 1;
pub const AT_REMOVEDIR = 2;
pub const AT_EACCESS = 4;
pub const AT_SYMLINK_FOLLOW = 8;

pub fn WEXITSTATUS(s: u32) u32 {
    return (s & 0xff00) >> 8;
}
pub fn WTERMSIG(s: u32) u32 {
    return s & 0x7f;
}
pub fn WSTOPSIG(s: u32) u32 {
    return WEXITSTATUS(s);
}
pub fn WIFEXITED(s: u32) bool {
    return WTERMSIG(s) == 0;
}
pub fn WIFSTOPPED(s: u32) bool {
    return @intCast(u16, (((s & 0xffff) *% 0x10001) >> 8)) > 0x7f00;
}
pub fn WIFSIGNALED(s: u32) bool {
    return (s & 0xffff) -% 1 < 0xff;
}

pub const dirent = extern struct {
    d_fileno: c_ulong,
    d_namlen: u16,
    d_type: u8,
    d_unused1: u8,
    d_unused2: u32,
    d_name: [256]u8,

    pub fn reclen(self: dirent) u16 {
        return (@byteOffsetOf(dirent, "d_name") + self.d_namlen + 1 + 7) & ~@as(u16, 7);
    }
};

pub const DT_UNKNOWN = 0;
pub const DT_FIFO = 1;
pub const DT_CHR = 2;
pub const DT_DIR = 4;
pub const DT_BLK = 6;
pub const DT_REG = 8;
pub const DT_LNK = 10;
pub const DT_SOCK = 12;
pub const DT_WHT = 14;
pub const DT_DBF = 15;

pub const CLOCK_REALTIME = 0;
pub const CLOCK_VIRTUAL = 1;
pub const CLOCK_PROF = 2;
pub const CLOCK_MONOTONIC = 4;
pub const CLOCK_UPTIME = 5;
pub const CLOCK_UPTIME_PRECISE = 7;
pub const CLOCK_UPTIME_FAST = 8;
pub const CLOCK_REALTIME_PRECISE = 9;
pub const CLOCK_REALTIME_FAST = 10;
pub const CLOCK_MONOTONIC_PRECISE = 11;
pub const CLOCK_MONOTONIC_FAST = 12;
pub const CLOCK_SECOND = 13;
pub const CLOCK_THREAD_CPUTIME_ID = 14;
pub const CLOCK_PROCESS_CPUTIME_ID = 15;

pub const sockaddr = extern struct {
    sa_len: u8,
    sa_family: u8,
    sa_data: [14]u8,
};

pub const Kevent = extern struct {
    ident: usize,
    filter: c_short,
    flags: c_ushort,
    fflags: c_uint,
    data: isize,
    udata: usize,
};

pub const EVFILT_FS = -10;
pub const EVFILT_USER = -9;
pub const EVFILT_EXCEPT = -8;
pub const EVFILT_TIMER = -7;
pub const EVFILT_SIGNAL = -6;
pub const EVFILT_PROC = -5;
pub const EVFILT_VNODE = -4;
pub const EVFILT_AIO = -3;
pub const EVFILT_WRITE = -2;
pub const EVFILT_READ = -1;
pub const EVFILT_SYSCOUNT = 10;
pub const EVFILT_MARKER = 15;

pub const EV_ADD = 1;
pub const EV_DELETE = 2;
pub const EV_ENABLE = 4;
pub const EV_DISABLE = 8;
pub const EV_ONESHOT = 16;
pub const EV_CLEAR = 32;
pub const EV_RECEIPT = 64;
pub const EV_DISPATCH = 128;
pub const EV_NODATA = 4096;
pub const EV_FLAG1 = 8192;
pub const EV_ERROR = 16384;
pub const EV_EOF = 32768;
pub const EV_SYSFLAGS = 61440;

pub const NOTE_FFNOP = 0;
pub const NOTE_TRACK = 1;
pub const NOTE_DELETE = 1;
pub const NOTE_LOWAT = 1;
pub const NOTE_TRACKERR = 2;
pub const NOTE_OOB = 2;
pub const NOTE_WRITE = 2;
pub const NOTE_EXTEND = 4;
pub const NOTE_CHILD = 4;
pub const NOTE_ATTRIB = 8;
pub const NOTE_LINK = 16;
pub const NOTE_RENAME = 32;
pub const NOTE_REVOKE = 64;
pub const NOTE_PDATAMASK = 1048575;
pub const NOTE_FFLAGSMASK = 16777215;
pub const NOTE_TRIGGER = 16777216;
pub const NOTE_EXEC = 536870912;
pub const NOTE_FFAND = 1073741824;
pub const NOTE_FORK = 1073741824;
pub const NOTE_EXIT = 2147483648;
pub const NOTE_FFOR = 2147483648;
pub const NOTE_FFCTRLMASK = 3221225472;
pub const NOTE_FFCOPY = 3221225472;
pub const NOTE_PCTRLMASK = 4026531840;

pub const stack_t = extern struct {
    ss_sp: [*]u8,
    ss_size: isize,
    ss_flags: i32,
};

pub const S_IREAD = S_IRUSR;
pub const S_IEXEC = S_IXUSR;
pub const S_IWRITE = S_IWUSR;
pub const S_IXOTH = 1;
pub const S_IWOTH = 2;
pub const S_IROTH = 4;
pub const S_IRWXO = 7;
pub const S_IXGRP = 8;
pub const S_IWGRP = 16;
pub const S_IRGRP = 32;
pub const S_IRWXG = 56;
pub const S_IXUSR = 64;
pub const S_IWUSR = 128;
pub const S_IRUSR = 256;
pub const S_IRWXU = 448;
pub const S_ISTXT = 512;
pub const S_BLKSIZE = 512;
pub const S_ISVTX = 512;
pub const S_ISGID = 1024;
pub const S_ISUID = 2048;
pub const S_IFIFO = 4096;
pub const S_IFCHR = 8192;
pub const S_IFDIR = 16384;
pub const S_IFBLK = 24576;
pub const S_IFREG = 32768;
pub const S_IFDB = 36864;
pub const S_IFLNK = 40960;
pub const S_IFSOCK = 49152;
pub const S_IFWHT = 57344;
pub const S_IFMT = 61440;

pub const SIG_ERR = @intToPtr(fn (i32) callconv(.C) void, maxInt(usize));
pub const SIG_DFL = @intToPtr(fn (i32) callconv(.C) void, 0);
pub const SIG_IGN = @intToPtr(fn (i32) callconv(.C) void, 1);
pub const BADSIG = SIG_ERR;
pub const SIG_BLOCK = 1;
pub const SIG_UNBLOCK = 2;
pub const SIG_SETMASK = 3;

pub const SIGIOT = SIGABRT;
pub const SIGHUP = 1;
pub const SIGINT = 2;
pub const SIGQUIT = 3;
pub const SIGILL = 4;
pub const SIGTRAP = 5;
pub const SIGABRT = 6;
pub const SIGEMT = 7;
pub const SIGFPE = 8;
pub const SIGKILL = 9;
pub const SIGBUS = 10;
pub const SIGSEGV = 11;
pub const SIGSYS = 12;
pub const SIGPIPE = 13;
pub const SIGALRM = 14;
pub const SIGTERM = 15;
pub const SIGURG = 16;
pub const SIGSTOP = 17;
pub const SIGTSTP = 18;
pub const SIGCONT = 19;
pub const SIGCHLD = 20;
pub const SIGTTIN = 21;
pub const SIGTTOU = 22;
pub const SIGIO = 23;
pub const SIGXCPU = 24;
pub const SIGXFSZ = 25;
pub const SIGVTALRM = 26;
pub const SIGPROF = 27;
pub const SIGWINCH = 28;
pub const SIGINFO = 29;
pub const SIGUSR1 = 30;
pub const SIGUSR2 = 31;
pub const SIGTHR = 32;
pub const SIGCKPT = 33;
pub const SIGCKPTEXIT = 34;
pub const siginfo_t = extern struct {
    si_signo: c_int,
    si_errno: c_int,
    si_code: c_int,
    si_pid: c_int,
    si_uid: uid_t,
    si_status: c_int,
    si_addr: ?*c_void,
    si_value: union_sigval,
    si_band: c_long,
    __spare__: [7]c_int,
};
pub const sigset_t = extern struct {
    __bits: [4]c_uint,
};
pub const sig_atomic_t = c_int;
pub const Sigaction = extern struct {
    __sigaction_u: extern union {
        __sa_handler: ?fn (c_int) callconv(.C) void,
        __sa_sigaction: ?fn (c_int, [*c]siginfo_t, ?*c_void) callconv(.C) void,
    },
    sa_flags: c_int,
    sa_mask: sigset_t,
};
pub const sig_t = [*c]fn (c_int) callconv(.C) void;

pub const sigvec = extern struct {
    sv_handler: [*c]__sighandler_t,
    sv_mask: c_int,
    sv_flags: c_int,
};

pub const SOCK_STREAM = 1;
pub const SOCK_DGRAM = 2;
pub const SOCK_RAW = 3;
pub const SOCK_RDM = 4;
pub const SOCK_SEQPACKET = 5;
pub const SOCK_MAXADDRLEN = 255;
pub const SOCK_CLOEXEC = 268435456;
pub const SOCK_NONBLOCK = 536870912;

pub const PF_INET6 = AF_INET6;
pub const PF_IMPLINK = AF_IMPLINK;
pub const PF_ROUTE = AF_ROUTE;
pub const PF_ISO = AF_ISO;
pub const PF_PIP = pseudo_AF_PIP;
pub const PF_CHAOS = AF_CHAOS;
pub const PF_DATAKIT = AF_DATAKIT;
pub const PF_INET = AF_INET;
pub const PF_APPLETALK = AF_APPLETALK;
pub const PF_SIP = AF_SIP;
pub const PF_OSI = AF_ISO;
pub const PF_CNT = AF_CNT;
pub const PF_LINK = AF_LINK;
pub const PF_HYLINK = AF_HYLINK;
pub const PF_MAX = AF_MAX;
pub const PF_KEY = pseudo_AF_KEY;
pub const PF_PUP = AF_PUP;
pub const PF_COIP = AF_COIP;
pub const PF_SNA = AF_SNA;
pub const PF_LOCAL = AF_LOCAL;
pub const PF_NETBIOS = AF_NETBIOS;
pub const PF_NATM = AF_NATM;
pub const PF_BLUETOOTH = AF_BLUETOOTH;
pub const PF_UNSPEC = AF_UNSPEC;
pub const PF_NETGRAPH = AF_NETGRAPH;
pub const PF_ECMA = AF_ECMA;
pub const PF_IPX = AF_IPX;
pub const PF_DLI = AF_DLI;
pub const PF_ATM = AF_ATM;
pub const PF_CCITT = AF_CCITT;
pub const PF_ISDN = AF_ISDN;
pub const PF_RTIP = pseudo_AF_RTIP;
pub const PF_LAT = AF_LAT;
pub const PF_UNIX = PF_LOCAL;
pub const PF_XTP = pseudo_AF_XTP;
pub const PF_DECnet = AF_DECnet;

pub const AF_UNSPEC = 0;
pub const AF_OSI = AF_ISO;
pub const AF_UNIX = AF_LOCAL;
pub const AF_LOCAL = 1;
pub const AF_INET = 2;
pub const AF_IMPLINK = 3;
pub const AF_PUP = 4;
pub const AF_CHAOS = 5;
pub const AF_NETBIOS = 6;
pub const AF_ISO = 7;
pub const AF_ECMA = 8;
pub const AF_DATAKIT = 9;
pub const AF_CCITT = 10;
pub const AF_SNA = 11;
pub const AF_DLI = 13;
pub const AF_LAT = 14;
pub const AF_HYLINK = 15;
pub const AF_APPLETALK = 16;
pub const AF_ROUTE = 17;
pub const AF_LINK = 18;
pub const AF_COIP = 20;
pub const AF_CNT = 21;
pub const AF_IPX = 23;
pub const AF_SIP = 24;
pub const AF_ISDN = 26;
pub const AF_NATM = 29;
pub const AF_ATM = 30;
pub const AF_NETGRAPH = 32;
pub const AF_BLUETOOTH = 33;
pub const AF_MPLS = 34;
pub const AF_MAX = 36;

pub const sa_family_t = u8;
pub const socklen_t = c_uint;
pub const sockaddr_storage = extern struct {
    ss_len: u8,
    ss_family: sa_family_t,
    __ss_pad1: [6]u8,
    __ss_align: i64,
    __ss_pad2: [112]u8,
};
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 msghdr = extern struct {
    msg_name: ?*c_void,
    msg_namelen: socklen_t,
    msg_iov: [*c]iovec,
    msg_iovlen: c_int,
    msg_control: ?*c_void,
    msg_controllen: socklen_t,
    msg_flags: c_int,
};
pub const cmsghdr = extern struct {
    cmsg_len: socklen_t,
    cmsg_level: c_int,
    cmsg_type: c_int,
};
pub const cmsgcred = extern struct {
    cmcred_pid: pid_t,
    cmcred_uid: uid_t,
    cmcred_euid: uid_t,
    cmcred_gid: gid_t,
    cmcred_ngroups: c_short,
    cmcred_groups: [16]gid_t,
};
pub const sf_hdtr = extern struct {
    headers: [*c]iovec,
    hdr_cnt: c_int,
    trailers: [*c]iovec,
    trl_cnt: c_int,
};

pub const MS_SYNC = 0;
pub const MS_ASYNC = 1;
pub const MS_INVALIDATE = 2;

pub const POSIX_MADV_SEQUENTIAL = 2;
pub const POSIX_MADV_RANDOM = 1;
pub const POSIX_MADV_DONTNEED = 4;
pub const POSIX_MADV_NORMAL = 0;
pub const POSIX_MADV_WILLNEED = 3;

pub const MADV_SEQUENTIAL = 2;
pub const MADV_CONTROL_END = MADV_SETMAP;
pub const MADV_DONTNEED = 4;
pub const MADV_RANDOM = 1;
pub const MADV_WILLNEED = 3;
pub const MADV_NORMAL = 0;
pub const MADV_CONTROL_START = MADV_INVAL;
pub const MADV_FREE = 5;
pub const MADV_NOSYNC = 6;
pub const MADV_AUTOSYNC = 7;
pub const MADV_NOCORE = 8;
pub const MADV_CORE = 9;
pub const MADV_INVAL = 10;
pub const MADV_SETMAP = 11;

pub const F_DUPFD = 0;
pub const F_GETFD = 1;
pub const F_RDLCK = 1;
pub const F_SETFD = 2;
pub const F_UNLCK = 2;
pub const F_WRLCK = 3;
pub const F_GETFL = 3;
pub const F_SETFL = 4;
pub const F_GETOWN = 5;
pub const F_SETOWN = 6;
pub const F_GETLK = 7;
pub const F_SETLK = 8;
pub const F_SETLKW = 9;
pub const F_DUP2FD = 10;
pub const F_DUPFD_CLOEXEC = 17;
pub const F_DUP2FD_CLOEXEC = 18;

pub const LOCK_SH = 1;
pub const LOCK_EX = 2;
pub const LOCK_UN = 8;
pub const LOCK_NB = 4;

pub const Flock = extern struct {
    l_start: off_t,
    l_len: off_t,
    l_pid: pid_t,
    l_type: c_short,
    l_whence: c_short,
};

pub const rlimit_resource = extern enum(c_int) {
    CPU = 0,
    FSIZE = 1,
    DATA = 2,
    STACK = 3,
    CORE = 4,
    RSS = 5,
    MEMLOCK = 6,
    NPROC = 7,
    NOFILE = 8,
    SBSIZE = 9,
    AS = 10,
    VMEM = 10,
    POSIXLOCKS = 11,

    _,
};

pub const rlim_t = i64;

/// No limit
pub const RLIM_INFINITY: rlim_t = (1 << 63) - 1;

pub const RLIM_SAVED_MAX = RLIM_INFINITY;
pub const RLIM_SAVED_CUR = RLIM_INFINITY;

pub const rlimit = extern struct {
    /// Soft limit
    cur: rlim_t,
    /// Hard limit
    max: rlim_t,
};
