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    s! {
        pub struct sigaction {
            pub sa_sigaction: ::sighandler_t,
            pub sa_mask: ::sigset_t,
            pub sa_flags: ::c_int,
            _restorer: *mut ::c_void,
        }

        pub struct stack_t {
            pub ss_sp: *mut ::c_void,
            pub ss_flags: ::c_int,
            pub ss_size: ::size_t
        }

        pub struct siginfo_t {
            pub si_signo: ::c_int,
            pub si_errno: ::c_int,
            pub si_code: ::c_int,
            pub _pad: [::c_int; 29],
            _align: [usize; 0],
        }

        pub struct glob64_t {
            pub gl_pathc: ::size_t,
            pub gl_pathv: *mut *mut ::c_char,
            pub gl_offs: ::size_t,
            pub gl_flags: ::c_int,

            __unused1: *mut ::c_void,
            __unused2: *mut ::c_void,
            __unused3: *mut ::c_void,
            __unused4: *mut ::c_void,
            __unused5: *mut ::c_void,
        }

        pub struct ucred {
            pub pid: ::pid_t,
            pub uid: ::uid_t,
            pub gid: ::gid_t,
        }

        pub struct statfs {
            pub f_type: __fsword_t,
            pub f_bsize: __fsword_t,
            pub f_blocks: ::fsblkcnt_t,
            pub f_bfree: ::fsblkcnt_t,
            pub f_bavail: ::fsblkcnt_t,

            pub f_files: ::fsfilcnt_t,
            pub f_ffree: ::fsfilcnt_t,
            pub f_fsid: ::fsid_t,

            pub f_namelen: __fsword_t,
            pub f_frsize: __fsword_t,
            f_spare: [__fsword_t; 5],
        }

        pub struct msghdr {
            pub msg_name: *mut ::c_void,
            pub msg_namelen: ::socklen_t,
            pub msg_iov: *mut ::iovec,
            pub msg_iovlen: ::size_t,
            pub msg_control: *mut ::c_void,
            pub msg_controllen: ::size_t,
            pub msg_flags: ::c_int,
        }

        pub struct termios {
            pub c_iflag: ::tcflag_t,
            pub c_oflag: ::tcflag_t,
            pub c_cflag: ::tcflag_t,
            pub c_lflag: ::tcflag_t,
            pub c_line: ::cc_t,
            pub c_cc: [::cc_t; ::NCCS],
            pub c_ispeed: ::speed_t,
            pub c_ospeed: ::speed_t,
        }

        pub struct flock {
            pub l_type: ::c_short,
            pub l_whence: ::c_short,
            pub l_start: ::off_t,
            pub l_len: ::off_t,
            pub l_pid: ::pid_t,
        }
    }

    pub const RLIMIT_RSS: ::c_int = 5;
    pub const RLIMIT_NOFILE: ::c_int = 7;
    pub const RLIMIT_AS: ::c_int = 9;
    pub const RLIMIT_NPROC: ::c_int = 6;
    pub const RLIMIT_MEMLOCK: ::c_int = 8;
    pub const RLIM_INFINITY: ::rlim_t = !0;
    pub const RLIMIT_RTTIME: ::c_int = 15;
    pub const RLIMIT_NLIMITS: ::c_int = 16;

    pub const O_APPEND: ::c_int = 1024;
    pub const O_CREAT: ::c_int = 64;
    pub const O_EXCL: ::c_int = 128;
    pub const O_NOCTTY: ::c_int = 256;
    pub const O_NONBLOCK: ::c_int = 2048;
    pub const O_SYNC: ::c_int = 1052672;
    pub const O_RSYNC: ::c_int = 1052672;
    pub const O_DSYNC: ::c_int = 4096;
    pub const O_FSYNC: ::c_int = 0x101000;

    pub const MAP_ANON: ::c_int = 0x0020;
    pub const MAP_ANONYMOUS: ::c_int = 0x0020;
    pub const MAP_GROWSDOWN: ::c_int = 0x0100;
    pub const MAP_DENYWRITE: ::c_int = 0x0800;
    pub const MAP_EXECUTABLE: ::c_int = 0x01000;
    pub const MAP_POPULATE: ::c_int = 0x08000;
    pub const MAP_NONBLOCK: ::c_int = 0x010000;
    pub const MAP_STACK: ::c_int = 0x020000;

    pub const EDEADLK: ::c_int = 35;
    pub const ENAMETOOLONG: ::c_int = 36;
    pub const ENOLCK: ::c_int = 37;
    pub const ENOSYS: ::c_int = 38;
    pub const ENOTEMPTY: ::c_int = 39;
    pub const ELOOP: ::c_int = 40;
    pub const ENOMSG: ::c_int = 42;
    pub const EIDRM: ::c_int = 43;
    pub const ECHRNG: ::c_int = 44;
    pub const EL2NSYNC: ::c_int = 45;
    pub const EL3HLT: ::c_int = 46;
    pub const EL3RST: ::c_int = 47;
    pub const ELNRNG: ::c_int = 48;
    pub const EUNATCH: ::c_int = 49;
    pub const ENOCSI: ::c_int = 50;
    pub const EL2HLT: ::c_int = 51;
    pub const EBADE: ::c_int = 52;
    pub const EBADR: ::c_int = 53;
    pub const EXFULL: ::c_int = 54;
    pub const ENOANO: ::c_int = 55;
    pub const EBADRQC: ::c_int = 56;
    pub const EBADSLT: ::c_int = 57;
    pub const EMULTIHOP: ::c_int = 72;
    pub const EOVERFLOW: ::c_int = 75;
    pub const ENOTUNIQ: ::c_int = 76;
    pub const EBADFD: ::c_int = 77;
    pub const EBADMSG: ::c_int = 74;
    pub const EREMCHG: ::c_int = 78;
    pub const ELIBACC: ::c_int = 79;
    pub const ELIBBAD: ::c_int = 80;
    pub const ELIBSCN: ::c_int = 81;
    pub const ELIBMAX: ::c_int = 82;
    pub const ELIBEXEC: ::c_int = 83;
    pub const EILSEQ: ::c_int = 84;
    pub const ERESTART: ::c_int = 85;
    pub const ESTRPIPE: ::c_int = 86;
    pub const EUSERS: ::c_int = 87;
    pub const ENOTSOCK: ::c_int = 88;
    pub const EDESTADDRREQ: ::c_int = 89;
    pub const EMSGSIZE: ::c_int = 90;
    pub const EPROTOTYPE: ::c_int = 91;
    pub const ENOPROTOOPT: ::c_int = 92;
    pub const EPROTONOSUPPORT: ::c_int = 93;
    pub const ESOCKTNOSUPPORT: ::c_int = 94;
    pub const EOPNOTSUPP: ::c_int = 95;
    pub const EPFNOSUPPORT: ::c_int = 96;
    pub const EAFNOSUPPORT: ::c_int = 97;
    pub const EADDRINUSE: ::c_int = 98;
    pub const EADDRNOTAVAIL: ::c_int = 99;
    pub const ENETDOWN: ::c_int = 100;
    pub const ENETUNREACH: ::c_int = 101;
    pub const ENETRESET: ::c_int = 102;
    pub const ECONNABORTED: ::c_int = 103;
    pub const ECONNRESET: ::c_int = 104;
    pub const ENOBUFS: ::c_int = 105;
    pub const EISCONN: ::c_int = 106;
    pub const ENOTCONN: ::c_int = 107;
    pub const ESHUTDOWN: ::c_int = 108;
    pub const ETOOMANYREFS: ::c_int = 109;
    pub const ETIMEDOUT: ::c_int = 110;
    pub const ECONNREFUSED: ::c_int = 111;
    pub const EHOSTDOWN: ::c_int = 112;
    pub const EHOSTUNREACH: ::c_int = 113;
    pub const EALREADY: ::c_int = 114;
    pub const EINPROGRESS: ::c_int = 115;
    pub const ESTALE: ::c_int = 116;
    pub const EUCLEAN: ::c_int = 117;
    pub const ENOTNAM: ::c_int = 118;
    pub const ENAVAIL: ::c_int = 119;
    pub const EISNAM: ::c_int = 120;
    pub const EREMOTEIO: ::c_int = 121;
    pub const EDQUOT: ::c_int = 122;
    pub const ENOMEDIUM: ::c_int = 123;
    pub const EMEDIUMTYPE: ::c_int = 124;
    pub const ECANCELED: ::c_int = 125;
    pub const ENOKEY: ::c_int = 126;
    pub const EKEYEXPIRED: ::c_int = 127;
    pub const EKEYREVOKED: ::c_int = 128;
    pub const EKEYREJECTED: ::c_int = 129;
    pub const EOWNERDEAD: ::c_int = 130;
    pub const ENOTRECOVERABLE: ::c_int = 131;
    pub const EHWPOISON: ::c_int = 133;
    pub const ERFKILL: ::c_int = 132;

    pub const SOCK_STREAM: ::c_int = 1;
    pub const SOCK_DGRAM: ::c_int = 2;

    pub const SOL_SOCKET: ::c_int = 1;

    pub const SO_REUSEADDR: ::c_int = 2;
    pub const SO_TYPE: ::c_int = 3;
    pub const SO_ERROR: ::c_int = 4;
    pub const SO_DONTROUTE: ::c_int = 5;
    pub const SO_BROADCAST: ::c_int = 6;
    pub const SO_SNDBUF: ::c_int = 7;
    pub const SO_RCVBUF: ::c_int = 8;
    pub const SO_KEEPALIVE: ::c_int = 9;
    pub const SO_OOBINLINE: ::c_int = 10;
    pub const SO_LINGER: ::c_int = 13;
    pub const SO_REUSEPORT: ::c_int = 15;
    pub const SO_ACCEPTCONN: ::c_int = 30;

    pub const TCP_COOKIE_TRANSACTIONS: ::c_int = 15;
    pub const TCP_THIN_LINEAR_TIMEOUTS: ::c_int = 16;
    pub const TCP_THIN_DUPACK: ::c_int = 17;
    pub const TCP_USER_TIMEOUT: ::c_int = 18;
    pub const TCP_REPAIR: ::c_int = 19;
    pub const TCP_REPAIR_QUEUE: ::c_int = 20;
    pub const TCP_QUEUE_SEQ: ::c_int = 21;
    pub const TCP_REPAIR_OPTIONS: ::c_int = 22;
    pub const TCP_FASTOPEN: ::c_int = 23;
    pub const TCP_TIMESTAMP: ::c_int = 24;

    pub const SA_ONSTACK: ::c_int = 0x08000000;
    pub const SA_SIGINFO: ::c_int = 0x00000004;
    pub const SA_NOCLDWAIT: ::c_int = 0x00000002;

    pub const SIGCHLD: ::c_int = 17;
    pub const SIGBUS: ::c_int = 7;
    pub const SIGUSR1: ::c_int = 10;
    pub const SIGUSR2: ::c_int = 12;
    pub const SIGCONT: ::c_int = 18;
    pub const SIGSTOP: ::c_int = 19;
    pub const SIGTSTP: ::c_int = 20;
    pub const SIGURG: ::c_int = 23;
    pub const SIGIO: ::c_int = 29;
    pub const SIGSYS: ::c_int = 31;
    pub const SIGSTKFLT: ::c_int = 16;
    pub const SIGUNUSED: ::c_int = 31;
    pub const SIGTTIN: ::c_int = 21;
    pub const SIGTTOU: ::c_int = 22;
    pub const SIGXCPU: ::c_int = 24;
    pub const SIGXFSZ: ::c_int = 25;
    pub const SIGVTALRM: ::c_int = 26;
    pub const SIGPROF: ::c_int = 27;
    pub const SIGWINCH: ::c_int = 28;
    pub const SIGPOLL: ::c_int = 29;
    pub const SIGPWR: ::c_int = 30;
    pub const SIG_SETMASK: ::c_int = 2;
    pub const SIG_BLOCK: ::c_int = 0x000000;
    pub const SIG_UNBLOCK: ::c_int = 0x01;

    pub const FALLOC_FL_KEEP_SIZE: ::c_int = 0x01;
    pub const FALLOC_FL_PUNCH_HOLE: ::c_int = 0x02;

    pub const BUFSIZ: ::c_uint = 8192;
    pub const TMP_MAX: ::c_uint = 238328;
    pub const FOPEN_MAX: ::c_uint = 16;
    pub const POSIX_MADV_DONTNEED: ::c_int = 4;
    pub const _SC_2_C_VERSION: ::c_int = 96;
    pub const RUSAGE_THREAD: ::c_int = 1;
    pub const O_ACCMODE: ::c_int = 3;
    pub const O_ASYNC: ::c_int = 0x2000;
    pub const O_NDELAY: ::c_int = 0x800;
    pub const RUSAGE_CHILDREN: ::c_int = -1;
    pub const ST_RELATIME: ::c_ulong = 4096;
    pub const NI_MAXHOST: ::socklen_t = 1025;

    pub const ADFS_SUPER_MAGIC: ::c_long = 0x0000adf5;
    pub const AFFS_SUPER_MAGIC: ::c_long = 0x0000adff;
    pub const CODA_SUPER_MAGIC: ::c_long = 0x73757245;
    pub const CRAMFS_MAGIC: ::c_long = 0x28cd3d45;
    pub const EFS_SUPER_MAGIC: ::c_long = 0x00414a53;
    pub const EXT2_SUPER_MAGIC: ::c_long = 0x0000ef53;
    pub const EXT3_SUPER_MAGIC: ::c_long = 0x0000ef53;
    pub const EXT4_SUPER_MAGIC: ::c_long = 0x0000ef53;
    pub const HPFS_SUPER_MAGIC: ::c_long = 0xf995e849;
    pub const HUGETLBFS_MAGIC: ::c_long = 0x958458f6;
    pub const ISOFS_SUPER_MAGIC: ::c_long = 0x00009660;
    pub const JFFS2_SUPER_MAGIC: ::c_long = 0x000072b6;
    pub const MINIX_SUPER_MAGIC: ::c_long = 0x0000137f;
    pub const MINIX_SUPER_MAGIC2: ::c_long = 0x0000138f;
    pub const MINIX2_SUPER_MAGIC: ::c_long = 0x00002468;
    pub const MINIX2_SUPER_MAGIC2: ::c_long = 0x00002478;
    pub const MSDOS_SUPER_MAGIC: ::c_long = 0x00004d44;
    pub const NCP_SUPER_MAGIC: ::c_long = 0x0000564c;
    pub const NFS_SUPER_MAGIC: ::c_long = 0x00006969;
    pub const OPENPROM_SUPER_MAGIC: ::c_long = 0x00009fa1;
    pub const PROC_SUPER_MAGIC: ::c_long = 0x00009fa0;
    pub const QNX4_SUPER_MAGIC: ::c_long = 0x0000002f;
    pub const REISERFS_SUPER_MAGIC: ::c_long = 0x52654973;
    pub const SMB_SUPER_MAGIC: ::c_long = 0x0000517b;
    pub const TMPFS_MAGIC: ::c_long = 0x01021994;
    pub const USBDEVICE_SUPER_MAGIC: ::c_long = 0x00009fa2;

    pub const VEOF: usize = 4;
    pub const VEOL: usize = 11;
    pub const VEOL2: usize = 16;
    pub const VMIN: usize = 6;
    pub const IEXTEN: ::tcflag_t = 0x00008000;
    pub const TOSTOP: ::tcflag_t = 0x00000100;
    pub const FLUSHO: ::tcflag_t = 0x00001000;
    pub const IUTF8: ::tcflag_t = 0x00004000;

    pub const CPU_SETSIZE: ::c_int = 0x400;

    pub const EXTPROC: ::tcflag_t = 0x00010000;

    pub const QFMT_VFS_V1: ::c_int = 4;

    pub const PTRACE_TRACEME: ::c_uint = 0;
    pub const PTRACE_PEEKTEXT: ::c_uint = 1;
    pub const PTRACE_PEEKDATA: ::c_uint = 2;
    pub const PTRACE_PEEKUSER: ::c_uint = 3;
    pub const PTRACE_POKETEXT: ::c_uint = 4;
    pub const PTRACE_POKEDATA: ::c_uint = 5;
    pub const PTRACE_POKEUSER: ::c_uint = 6;
    pub const PTRACE_CONT: ::c_uint = 7;
    pub const PTRACE_KILL: ::c_uint = 8;
    pub const PTRACE_SINGLESTEP: ::c_uint = 9;
    pub const PTRACE_ATTACH: ::c_uint = 16;
    pub const PTRACE_DETACH: ::c_uint = 17;
    pub const PTRACE_SYSCALL: ::c_uint = 24;
    pub const PTRACE_SETOPTIONS: ::c_uint = 0x4200;
    pub const PTRACE_GETEVENTMSG: ::c_uint = 0x4201;
    pub const PTRACE_GETSIGINFO: ::c_uint = 0x4202;
    pub const PTRACE_SETSIGINFO: ::c_uint = 0x4203;
    pub const PTRACE_GETREGSET: ::c_uint = 0x4204;
    pub const PTRACE_SETREGSET: ::c_uint = 0x4205;
    pub const PTRACE_SEIZE: ::c_uint = 0x4206;
    pub const PTRACE_INTERRUPT: ::c_uint = 0x4207;
    pub const PTRACE_LISTEN: ::c_uint = 0x4208;
    pub const PTRACE_PEEKSIGINFO: ::c_uint = 0x4209;

    pub const MADV_DODUMP: ::c_int = 17;
    pub const MADV_DONTDUMP: ::c_int = 16;

    pub const EPOLLWAKEUP: ::c_int = 0x20000000;

    pub const MADV_HUGEPAGE: ::c_int = 14;
    pub const MADV_NOHUGEPAGE: ::c_int = 15;
    pub const MAP_HUGETLB: ::c_int = 0x040000;

    pub const EFD_NONBLOCK: ::c_int = 0x800;

    pub const F_GETLK: ::c_int = 5;
    pub const F_GETOWN: ::c_int = 9;
    pub const F_SETOWN: ::c_int = 8;

    pub const SFD_NONBLOCK: ::c_int = 0x0800;

    pub const TCSANOW: ::c_int = 0;
    pub const TCSADRAIN: ::c_int = 1;
    pub const TCSAFLUSH: ::c_int = 2;

    pub const TCGETS: ::c_ulong = 0x5401;
    pub const TCSETS: ::c_ulong = 0x5402;
    pub const TCSETSW: ::c_ulong = 0x5403;
    pub const TCSETSF: ::c_ulong = 0x5404;
    pub const TCGETA: ::c_ulong = 0x5405;
    pub const TCSETA: ::c_ulong = 0x5406;
    pub const TCSETAW: ::c_ulong = 0x5407;
    pub const TCSETAF: ::c_ulong = 0x5408;
    pub const TCSBRK: ::c_ulong = 0x5409;
    pub const TCXONC: ::c_ulong = 0x540A;
    pub const TCFLSH: ::c_ulong = 0x540B;
    pub const TIOCGSOFTCAR: ::c_ulong = 0x5419;
    pub const TIOCSSOFTCAR: ::c_ulong = 0x541A;
    pub const TIOCINQ: ::c_ulong = 0x541B;
    pub const TIOCLINUX: ::c_ulong = 0x541C;
    pub const TIOCGSERIAL: ::c_ulong = 0x541E;
    pub const TIOCEXCL: ::c_ulong = 0x540C;
    pub const TIOCNXCL: ::c_ulong = 0x540D;
    pub const TIOCSCTTY: ::c_ulong = 0x540E;
    pub const TIOCGPGRP: ::c_ulong = 0x540F;
    pub const TIOCSPGRP: ::c_ulong = 0x5410;
    pub const TIOCOUTQ: ::c_ulong = 0x5411;
    pub const TIOCSTI: ::c_ulong = 0x5412;
    pub const TIOCGWINSZ: ::c_ulong = 0x5413;
    pub const TIOCSWINSZ: ::c_ulong = 0x5414;
    pub const TIOCMGET: ::c_ulong = 0x5415;
    pub const TIOCMBIS: ::c_ulong = 0x5416;
    pub const TIOCMBIC: ::c_ulong = 0x5417;
    pub const TIOCMSET: ::c_ulong = 0x5418;
    pub const FIONREAD: ::c_ulong = 0x541B;
    pub const TIOCCONS: ::c_ulong = 0x541D;

    cfg_if! {
        if #[cfg(any(target_arch = "arm", target_arch = "x86",
                     target_arch = "x86_64"))] {
            pub const PTHREAD_STACK_MIN: ::size_t = 16384;
        } else {
            pub const PTHREAD_STACK_MIN: ::size_t = 131072;
        }
    }

    extern {
        pub fn sysctl(name: *mut ::c_int,
                      namelen: ::c_int,
                      oldp: *mut ::c_void,
                      oldlenp: *mut ::size_t,
                      newp: *mut ::c_void,
                      newlen: ::size_t)
                      -> ::c_int;
        pub fn ioctl(fd: ::c_int, request: ::c_ulong, ...) -> ::c_int;
        pub fn backtrace(buf: *mut *mut ::c_void,
                         sz: ::c_int) -> ::c_int;
        pub fn glob64(pattern: *const ::c_char,
                      flags: ::c_int,
                      errfunc: ::dox::Option<extern "C" fn(epath: *const ::c_char,
                                                           errno: ::c_int) -> ::c_int>,
                      pglob: *mut glob64_t) -> ::c_int;
        pub fn globfree64(pglob: *mut glob64_t);
        pub fn getnameinfo(sa: *const ::sockaddr,
                           salen: ::socklen_t,
                           host: *mut ::c_char,
                           hostlen: ::socklen_t,
                           serv: *mut ::c_char,
                           sevlen: ::socklen_t,
                           flags: ::c_int) -> ::c_int;
        pub fn eventfd(init: ::c_int, flags: ::c_int) -> ::c_int;
        pub fn ptrace(request: ::c_uint, ...) -> ::c_long;
    }

    cfg_if! {
        if #[cfg(any(target_arch = "x86", target_arch = "arm"))] {
            mod b32;
            pub use self::b32::*;
        } else if #[cfg(any(target_arch = "x86_64",
                            target_arch = "aarch64",
                            target_arch = "powerpc64",
                            target_arch = "powerpc64le"))] {
            mod b64;
            pub use self::b64::*;
        } else {
            // ...
        }
    }

    s! {
        pub struct ipc_perm {
            pub __key: ::key_t,
            pub uid: ::uid_t,
            pub gid: ::gid_t,
            pub cuid: ::uid_t,
            pub cgid: ::gid_t,
            pub mode: ::c_ushort,
            __pad1: ::c_ushort,
            pub __seq: ::c_ushort,
            __pad2: ::c_ushort,
            __unused1: ::c_ulong,
            __unused2: ::c_ulong
        }

        pub struct shmid_ds {
            pub shm_perm: ::ipc_perm,
            pub shm_segsz: ::size_t,
            pub shm_atime: ::time_t,
            #[cfg(target_pointer_width = "32")]
            __unused1: ::c_ulong,
            pub shm_dtime: ::time_t,
            #[cfg(target_pointer_width = "32")]
            __unused2: ::c_ulong,
            pub shm_ctime: ::time_t,
            #[cfg(target_pointer_width = "32")]
            __unused3: ::c_ulong,
            pub shm_cpid: ::pid_t,
            pub shm_lpid: ::pid_t,
            pub shm_nattch: ::shmatt_t,
            __unused4: ::c_ulong,
            __unused5: ::c_ulong
        }
    }

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