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    use dox::mem;

    pub type sa_family_t = u16;
    pub type pthread_key_t = ::c_uint;
    pub type speed_t = ::c_uint;
    pub type tcflag_t = ::c_uint;
    pub type loff_t = ::c_longlong;
    pub type clockid_t = ::c_int;
    pub type key_t = ::c_int;
    pub type id_t = ::c_uint;

    pub enum timezone {}

    s! {
        pub struct sockaddr {
            pub sa_family: sa_family_t,
            pub sa_data: [::c_char; 14],
        }

        pub struct sockaddr_in {
            pub sin_family: sa_family_t,
            pub sin_port: ::in_port_t,
            pub sin_addr: ::in_addr,
            pub sin_zero: [u8; 8],
        }

        pub struct sockaddr_in6 {
            pub sin6_family: sa_family_t,
            pub sin6_port: ::in_port_t,
            pub sin6_flowinfo: u32,
            pub sin6_addr: ::in6_addr,
            pub sin6_scope_id: u32,
        }

        pub struct sockaddr_un {
            pub sun_family: sa_family_t,
            pub sun_path: [::c_char; 108]
        }

        pub struct sockaddr_storage {
            pub ss_family: sa_family_t,
            __ss_align: ::size_t,
            #[cfg(target_pointer_width = "32")]
            __ss_pad2: [u8; 128 - 2 * 4],
            #[cfg(target_pointer_width = "64")]
            __ss_pad2: [u8; 128 - 2 * 8],
        }

        pub struct addrinfo {
            pub ai_flags: ::c_int,
            pub ai_family: ::c_int,
            pub ai_socktype: ::c_int,
            pub ai_protocol: ::c_int,
            pub ai_addrlen: socklen_t,

            #[cfg(any(target_os = "linux",
                      target_os = "emscripten",
                      target_os = "fuchsia"))]
            pub ai_addr: *mut ::sockaddr,

            pub ai_canonname: *mut c_char,

            #[cfg(target_os = "android")]
            pub ai_addr: *mut ::sockaddr,

            pub ai_next: *mut addrinfo,
        }

        pub struct sockaddr_nl {
            pub nl_family: ::sa_family_t,
            nl_pad: ::c_ushort,
            pub nl_pid: u32,
            pub nl_groups: u32
        }

        pub struct sockaddr_ll {
            pub sll_family: ::c_ushort,
            pub sll_protocol: ::c_ushort,
            pub sll_ifindex: ::c_int,
            pub sll_hatype: ::c_ushort,
            pub sll_pkttype: ::c_uchar,
            pub sll_halen: ::c_uchar,
            pub sll_addr: [::c_uchar; 8]
        }

        pub struct fd_set {
            fds_bits: [::c_ulong; FD_SETSIZE / ULONG_SIZE],
        }

        pub struct tm {
            pub tm_sec: ::c_int,
            pub tm_min: ::c_int,
            pub tm_hour: ::c_int,
            pub tm_mday: ::c_int,
            pub tm_mon: ::c_int,
            pub tm_year: ::c_int,
            pub tm_wday: ::c_int,
            pub tm_yday: ::c_int,
            pub tm_isdst: ::c_int,
            pub tm_gmtoff: ::c_long,
            pub tm_zone: *const ::c_char,
        }

        pub struct sched_param {
            pub sched_priority: ::c_int,
            #[cfg(any(target_env = "musl"))]
            pub sched_ss_low_priority: ::c_int,
            #[cfg(any(target_env = "musl"))]
            pub sched_ss_repl_period: ::timespec,
            #[cfg(any(target_env = "musl"))]
            pub sched_ss_init_budget: ::timespec,
            #[cfg(any(target_env = "musl"))]
            pub sched_ss_max_repl: ::c_int,
        }

        pub struct Dl_info {
            pub dli_fname: *const ::c_char,
            pub dli_fbase: *mut ::c_void,
            pub dli_sname: *const ::c_char,
            pub dli_saddr: *mut ::c_void,
        }

        #[cfg_attr(any(all(target_arch = "x86", not(target_env = "musl")),
                       target_arch = "x86_64"),
                   repr(packed))]
        pub struct epoll_event {
            pub events: ::uint32_t,
            pub u64: ::uint64_t,
        }

        pub struct utsname {
            pub sysname: [::c_char; 65],
            pub nodename: [::c_char; 65],
            pub release: [::c_char; 65],
            pub version: [::c_char; 65],
            pub machine: [::c_char; 65],
            pub domainname: [::c_char; 65]
        }

        pub struct lconv {
            pub decimal_point: *mut ::c_char,
            pub thousands_sep: *mut ::c_char,
            pub grouping: *mut ::c_char,
            pub int_curr_symbol: *mut ::c_char,
            pub currency_symbol: *mut ::c_char,
            pub mon_decimal_point: *mut ::c_char,
            pub mon_thousands_sep: *mut ::c_char,
            pub mon_grouping: *mut ::c_char,
            pub positive_sign: *mut ::c_char,
            pub negative_sign: *mut ::c_char,
            pub int_frac_digits: ::c_char,
            pub frac_digits: ::c_char,
            pub p_cs_precedes: ::c_char,
            pub p_sep_by_space: ::c_char,
            pub n_cs_precedes: ::c_char,
            pub n_sep_by_space: ::c_char,
            pub p_sign_posn: ::c_char,
            pub n_sign_posn: ::c_char,
            pub int_p_cs_precedes: ::c_char,
            pub int_p_sep_by_space: ::c_char,
            pub int_n_cs_precedes: ::c_char,
            pub int_n_sep_by_space: ::c_char,
            pub int_p_sign_posn: ::c_char,
            pub int_n_sign_posn: ::c_char,
        }

        pub struct sigevent {
            pub sigev_value: ::sigval,
            pub sigev_signo: ::c_int,
            pub sigev_notify: ::c_int,
            // Actually a union.  We only expose sigev_notify_thread_id because it's
            // the most useful member
            pub sigev_notify_thread_id: ::c_int,
            #[cfg(target_pointer_width = "64")]
            __unused1: [::c_int; 11],
            #[cfg(target_pointer_width = "32")]
            __unused1: [::c_int; 12]
        }
    }

    // intentionally not public, only used for fd_set
    cfg_if! {
        if #[cfg(target_pointer_width = "32")] {
            const ULONG_SIZE: usize = 32;
        } else if #[cfg(target_pointer_width = "64")] {
            const ULONG_SIZE: usize = 64;
        } else {
            // Unknown target_pointer_width
        }
    }

    pub const EXIT_FAILURE: ::c_int = 1;
    pub const EXIT_SUCCESS: ::c_int = 0;
    pub const RAND_MAX: ::c_int = 2147483647;
    pub const EOF: ::c_int = -1;
    pub const SEEK_SET: ::c_int = 0;
    pub const SEEK_CUR: ::c_int = 1;
    pub const SEEK_END: ::c_int = 2;
    pub const _IOFBF: ::c_int = 0;
    pub const _IONBF: ::c_int = 2;
    pub const _IOLBF: ::c_int = 1;

    pub const F_DUPFD: ::c_int = 0;
    pub const F_GETFD: ::c_int = 1;
    pub const F_SETFD: ::c_int = 2;
    pub const F_GETFL: ::c_int = 3;
    pub const F_SETFL: ::c_int = 4;

    // Linux-specific fcntls
    pub const F_SETLEASE: ::c_int = 1024;
    pub const F_GETLEASE: ::c_int = 1025;
    pub const F_NOTIFY: ::c_int = 1026;
    pub const F_DUPFD_CLOEXEC: ::c_int = 1030;
    pub const F_SETPIPE_SZ: ::c_int = 1031;
    pub const F_GETPIPE_SZ: ::c_int = 1032;

    // TODO(#235): Include file sealing fcntls once we have a way to verify them.

    pub const SIGTRAP: ::c_int = 5;

    pub const PTHREAD_CREATE_JOINABLE: ::c_int = 0;
    pub const PTHREAD_CREATE_DETACHED: ::c_int = 1;

    pub const CLOCK_REALTIME: clockid_t = 0;
    pub const CLOCK_MONOTONIC: clockid_t = 1;
    pub const CLOCK_PROCESS_CPUTIME_ID: clockid_t = 2;
    pub const CLOCK_THREAD_CPUTIME_ID: clockid_t = 3;
    pub const CLOCK_MONOTONIC_RAW: clockid_t = 4;
    pub const CLOCK_REALTIME_COARSE: clockid_t = 5;
    pub const CLOCK_MONOTONIC_COARSE: clockid_t = 6;
    pub const CLOCK_BOOTTIME: clockid_t = 7;
    pub const CLOCK_REALTIME_ALARM: clockid_t = 8;
    pub const CLOCK_BOOTTIME_ALARM: clockid_t = 9;
    // TODO(#247) Someday our Travis shall have glibc 2.21 (released in Sep
    // 2014.) See also musl/mod.rs
    // pub const CLOCK_SGI_CYCLE: clockid_t = 10;
    // pub const CLOCK_TAI: clockid_t = 11;
    pub const TIMER_ABSTIME: ::c_int = 1;

    pub const RLIMIT_CPU: ::c_int = 0;
    pub const RLIMIT_FSIZE: ::c_int = 1;
    pub const RLIMIT_DATA: ::c_int = 2;
    pub const RLIMIT_STACK: ::c_int = 3;
    pub const RLIMIT_CORE: ::c_int = 4;
    pub const RLIMIT_LOCKS: ::c_int = 10;
    pub const RLIMIT_SIGPENDING: ::c_int = 11;
    pub const RLIMIT_MSGQUEUE: ::c_int = 12;
    pub const RLIMIT_NICE: ::c_int = 13;
    pub const RLIMIT_RTPRIO: ::c_int = 14;

    pub const RUSAGE_SELF: ::c_int = 0;

    pub const O_RDONLY: ::c_int = 0;
    pub const O_WRONLY: ::c_int = 1;
    pub const O_RDWR: ::c_int = 2;
    pub const O_TRUNC: ::c_int = 512;
    pub const O_CLOEXEC: ::c_int = 0x80000;

    pub const SOCK_CLOEXEC: ::c_int = O_CLOEXEC;

    pub const S_IFIFO: ::mode_t = 4096;
    pub const S_IFCHR: ::mode_t = 8192;
    pub const S_IFBLK: ::mode_t = 24576;
    pub const S_IFDIR: ::mode_t = 16384;
    pub const S_IFREG: ::mode_t = 32768;
    pub const S_IFLNK: ::mode_t = 40960;
    pub const S_IFSOCK: ::mode_t = 49152;
    pub const S_IFMT: ::mode_t = 61440;
    pub const S_IRWXU: ::mode_t = 448;
    pub const S_IXUSR: ::mode_t = 64;
    pub const S_IWUSR: ::mode_t = 128;
    pub const S_IRUSR: ::mode_t = 256;
    pub const S_IRWXG: ::mode_t = 56;
    pub const S_IXGRP: ::mode_t = 8;
    pub const S_IWGRP: ::mode_t = 16;
    pub const S_IRGRP: ::mode_t = 32;
    pub const S_IRWXO: ::mode_t = 7;
    pub const S_IXOTH: ::mode_t = 1;
    pub const S_IWOTH: ::mode_t = 2;
    pub const S_IROTH: ::mode_t = 4;
    pub const F_OK: ::c_int = 0;
    pub const R_OK: ::c_int = 4;
    pub const W_OK: ::c_int = 2;
    pub const X_OK: ::c_int = 1;
    pub const STDIN_FILENO: ::c_int = 0;
    pub const STDOUT_FILENO: ::c_int = 1;
    pub const STDERR_FILENO: ::c_int = 2;
    pub const SIGHUP: ::c_int = 1;
    pub const SIGINT: ::c_int = 2;
    pub const SIGQUIT: ::c_int = 3;
    pub const SIGILL: ::c_int = 4;
    pub const SIGABRT: ::c_int = 6;
    pub const SIGFPE: ::c_int = 8;
    pub const SIGKILL: ::c_int = 9;
    pub const SIGSEGV: ::c_int = 11;
    pub const SIGPIPE: ::c_int = 13;
    pub const SIGALRM: ::c_int = 14;
    pub const SIGTERM: ::c_int = 15;

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

    pub const LC_CTYPE: ::c_int = 0;
    pub const LC_NUMERIC: ::c_int = 1;
    pub const LC_TIME: ::c_int = 2;
    pub const LC_COLLATE: ::c_int = 3;
    pub const LC_MONETARY: ::c_int = 4;
    pub const LC_MESSAGES: ::c_int = 5;
    pub const LC_ALL: ::c_int = 6;
    pub const LC_CTYPE_MASK: ::c_int = (1 << LC_CTYPE);
    pub const LC_NUMERIC_MASK: ::c_int = (1 << LC_NUMERIC);
    pub const LC_TIME_MASK: ::c_int = (1 << LC_TIME);
    pub const LC_COLLATE_MASK: ::c_int = (1 << LC_COLLATE);
    pub const LC_MONETARY_MASK: ::c_int = (1 << LC_MONETARY);
    pub const LC_MESSAGES_MASK: ::c_int = (1 << LC_MESSAGES);
    // LC_ALL_MASK defined per platform

    pub const MAP_FILE: ::c_int = 0x0000;
    pub const MAP_SHARED: ::c_int = 0x0001;
    pub const MAP_PRIVATE: ::c_int = 0x0002;
    pub const MAP_FIXED: ::c_int = 0x0010;

    pub const MAP_FAILED: *mut ::c_void = !0 as *mut ::c_void;

    // MS_ flags for msync(2)
    pub const MS_ASYNC: ::c_int = 0x0001;
    pub const MS_INVALIDATE: ::c_int = 0x0002;
    pub const MS_SYNC: ::c_int = 0x0004;

    // MS_ flags for mount(2)
    pub const MS_RDONLY: ::c_ulong = 0x01;
    pub const MS_NOSUID: ::c_ulong = 0x02;
    pub const MS_NODEV: ::c_ulong = 0x04;
    pub const MS_NOEXEC: ::c_ulong = 0x08;
    pub const MS_SYNCHRONOUS: ::c_ulong = 0x10;
    pub const MS_REMOUNT: ::c_ulong = 0x20;
    pub const MS_MANDLOCK: ::c_ulong = 0x40;
    pub const MS_DIRSYNC: ::c_ulong = 0x80;
    pub const MS_NOATIME: ::c_ulong = 0x0400;
    pub const MS_NODIRATIME: ::c_ulong = 0x0800;
    pub const MS_BIND: ::c_ulong = 0x1000;
    pub const MS_MOVE: ::c_ulong = 0x2000;
    pub const MS_REC: ::c_ulong = 0x4000;
    pub const MS_SILENT: ::c_ulong = 0x8000;
    pub const MS_POSIXACL: ::c_ulong = 0x010000;
    pub const MS_UNBINDABLE: ::c_ulong = 0x020000;
    pub const MS_PRIVATE: ::c_ulong = 0x040000;
    pub const MS_SLAVE: ::c_ulong = 0x080000;
    pub const MS_SHARED: ::c_ulong = 0x100000;
    pub const MS_RELATIME: ::c_ulong = 0x200000;
    pub const MS_KERNMOUNT: ::c_ulong = 0x400000;
    pub const MS_I_VERSION: ::c_ulong = 0x800000;
    pub const MS_STRICTATIME: ::c_ulong = 0x1000000;
    pub const MS_ACTIVE: ::c_ulong = 0x40000000;
    pub const MS_NOUSER: ::c_ulong = 0x80000000;
    pub const MS_MGC_VAL: ::c_ulong = 0xc0ed0000;
    pub const MS_MGC_MSK: ::c_ulong = 0xffff0000;
    pub const MS_RMT_MASK: ::c_ulong = 0x800051;

    pub const EPERM: ::c_int = 1;
    pub const ENOENT: ::c_int = 2;
    pub const ESRCH: ::c_int = 3;
    pub const EINTR: ::c_int = 4;
    pub const EIO: ::c_int = 5;
    pub const ENXIO: ::c_int = 6;
    pub const E2BIG: ::c_int = 7;
    pub const ENOEXEC: ::c_int = 8;
    pub const EBADF: ::c_int = 9;
    pub const ECHILD: ::c_int = 10;
    pub const EAGAIN: ::c_int = 11;
    pub const ENOMEM: ::c_int = 12;
    pub const EACCES: ::c_int = 13;
    pub const EFAULT: ::c_int = 14;
    pub const ENOTBLK: ::c_int = 15;
    pub const EBUSY: ::c_int = 16;
    pub const EEXIST: ::c_int = 17;
    pub const EXDEV: ::c_int = 18;
    pub const ENODEV: ::c_int = 19;
    pub const ENOTDIR: ::c_int = 20;
    pub const EISDIR: ::c_int = 21;
    pub const EINVAL: ::c_int = 22;
    pub const ENFILE: ::c_int = 23;
    pub const EMFILE: ::c_int = 24;
    pub const ENOTTY: ::c_int = 25;
    pub const ETXTBSY: ::c_int = 26;
    pub const EFBIG: ::c_int = 27;
    pub const ENOSPC: ::c_int = 28;
    pub const ESPIPE: ::c_int = 29;
    pub const EROFS: ::c_int = 30;
    pub const EMLINK: ::c_int = 31;
    pub const EPIPE: ::c_int = 32;
    pub const EDOM: ::c_int = 33;
    pub const ERANGE: ::c_int = 34;
    pub const EWOULDBLOCK: ::c_int = EAGAIN;

    pub const EBFONT: ::c_int = 59;
    pub const ENOSTR: ::c_int = 60;
    pub const ENODATA: ::c_int = 61;
    pub const ETIME: ::c_int = 62;
    pub const ENOSR: ::c_int = 63;
    pub const ENONET: ::c_int = 64;
    pub const ENOPKG: ::c_int = 65;
    pub const EREMOTE: ::c_int = 66;
    pub const ENOLINK: ::c_int = 67;
    pub const EADV: ::c_int = 68;
    pub const ESRMNT: ::c_int = 69;
    pub const ECOMM: ::c_int = 70;
    pub const EPROTO: ::c_int = 71;
    pub const EDOTDOT: ::c_int = 73;

    pub const AF_PACKET: ::c_int = 17;
    pub const IPPROTO_RAW: ::c_int = 255;

    pub const PROT_GROWSDOWN: ::c_int = 0x1000000;
    pub const PROT_GROWSUP: ::c_int = 0x2000000;

    pub const MAP_TYPE: ::c_int = 0x000f;

    pub const MADV_NORMAL: ::c_int = 0;
    pub const MADV_RANDOM: ::c_int = 1;
    pub const MADV_SEQUENTIAL: ::c_int = 2;
    pub const MADV_WILLNEED: ::c_int = 3;
    pub const MADV_DONTNEED: ::c_int = 4;
    pub const MADV_REMOVE: ::c_int = 9;
    pub const MADV_DONTFORK: ::c_int = 10;
    pub const MADV_DOFORK: ::c_int = 11;
    pub const MADV_MERGEABLE: ::c_int = 12;
    pub const MADV_UNMERGEABLE: ::c_int = 13;
    pub const MADV_HWPOISON: ::c_int = 100;

    pub const IFF_UP: ::c_int = 0x1;
    pub const IFF_BROADCAST: ::c_int = 0x2;
    pub const IFF_DEBUG: ::c_int = 0x4;
    pub const IFF_LOOPBACK: ::c_int = 0x8;
    pub const IFF_POINTOPOINT: ::c_int = 0x10;
    pub const IFF_NOTRAILERS: ::c_int = 0x20;
    pub const IFF_RUNNING: ::c_int = 0x40;
    pub const IFF_NOARP: ::c_int = 0x80;
    pub const IFF_PROMISC: ::c_int = 0x100;
    pub const IFF_ALLMULTI: ::c_int = 0x200;
    pub const IFF_MASTER: ::c_int = 0x400;
    pub const IFF_SLAVE: ::c_int = 0x800;
    pub const IFF_MULTICAST: ::c_int = 0x1000;
    pub const IFF_PORTSEL: ::c_int = 0x2000;
    pub const IFF_AUTOMEDIA: ::c_int = 0x4000;
    pub const IFF_DYNAMIC: ::c_int = 0x8000;

    pub const AF_UNIX: ::c_int = 1;
    pub const AF_INET: ::c_int = 2;
    pub const AF_INET6: ::c_int = 10;
    pub const AF_NETLINK: ::c_int = 16;
    pub const SOCK_RAW: ::c_int = 3;
    pub const IPPROTO_TCP: ::c_int = 6;
    pub const IPPROTO_IP: ::c_int = 0;
    pub const IPPROTO_IPV6: ::c_int = 41;
    pub const IP_MULTICAST_TTL: ::c_int = 33;
    pub const IP_MULTICAST_LOOP: ::c_int = 34;
    pub const IP_TTL: ::c_int = 2;
    pub const IP_HDRINCL: ::c_int = 3;
    pub const IP_ADD_MEMBERSHIP: ::c_int = 35;
    pub const IP_DROP_MEMBERSHIP: ::c_int = 36;
    pub const IP_TRANSPARENT: ::c_int = 19;
    pub const IPV6_ADD_MEMBERSHIP: ::c_int = 20;
    pub const IPV6_DROP_MEMBERSHIP: ::c_int = 21;

    pub const TCP_NODELAY: ::c_int = 1;
    pub const TCP_MAXSEG: ::c_int = 2;
    pub const TCP_CORK: ::c_int = 3;
    pub const TCP_KEEPIDLE: ::c_int = 4;
    pub const TCP_KEEPINTVL: ::c_int = 5;
    pub const TCP_KEEPCNT: ::c_int = 6;
    pub const TCP_SYNCNT: ::c_int = 7;
    pub const TCP_LINGER2: ::c_int = 8;
    pub const TCP_DEFER_ACCEPT: ::c_int = 9;
    pub const TCP_WINDOW_CLAMP: ::c_int = 10;
    pub const TCP_INFO: ::c_int = 11;
    pub const TCP_QUICKACK: ::c_int = 12;
    pub const TCP_CONGESTION: ::c_int = 13;

    pub const IPV6_MULTICAST_LOOP: ::c_int = 19;
    pub const IPV6_V6ONLY: ::c_int = 26;

    pub const SO_DEBUG: ::c_int = 1;

    pub const MSG_NOSIGNAL: ::c_int = 0x4000;

    pub const SHUT_RD: ::c_int = 0;
    pub const SHUT_WR: ::c_int = 1;
    pub const SHUT_RDWR: ::c_int = 2;

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

    pub const SA_NODEFER: ::c_int = 0x40000000;
    pub const SA_RESETHAND: ::c_int = 0x80000000;
    pub const SA_RESTART: ::c_int = 0x10000000;
    pub const SA_NOCLDSTOP: ::c_int = 0x00000001;

    pub const SS_ONSTACK: ::c_int = 1;
    pub const SS_DISABLE: ::c_int = 2;

    pub const PATH_MAX: ::c_int = 4096;

    pub const FD_SETSIZE: usize = 1024;

    pub const EPOLLIN: ::c_int = 0x1;
    pub const EPOLLPRI: ::c_int = 0x2;
    pub const EPOLLOUT: ::c_int = 0x4;
    pub const EPOLLRDNORM: ::c_int = 0x40;
    pub const EPOLLRDBAND: ::c_int = 0x80;
    pub const EPOLLWRNORM: ::c_int = 0x100;
    pub const EPOLLWRBAND: ::c_int = 0x200;
    pub const EPOLLMSG: ::c_int = 0x400;
    pub const EPOLLERR: ::c_int = 0x8;
    pub const EPOLLHUP: ::c_int = 0x10;
    pub const EPOLLET: ::c_int = 0x80000000;

    pub const EPOLL_CTL_ADD: ::c_int = 1;
    pub const EPOLL_CTL_MOD: ::c_int = 3;
    pub const EPOLL_CTL_DEL: ::c_int = 2;

    pub const EPOLL_CLOEXEC: ::c_int = 0x80000;

    pub const MNT_DETACH: ::c_int = 0x2;
    pub const MNT_EXPIRE: ::c_int = 0x4;

    pub const Q_GETFMT: ::c_int = 0x800004;
    pub const Q_GETINFO: ::c_int = 0x800005;
    pub const Q_SETINFO: ::c_int = 0x800006;
    pub const QIF_BLIMITS: ::uint32_t = 1;
    pub const QIF_SPACE: ::uint32_t = 2;
    pub const QIF_ILIMITS: ::uint32_t = 4;
    pub const QIF_INODES: ::uint32_t = 8;
    pub const QIF_BTIME: ::uint32_t = 16;
    pub const QIF_ITIME: ::uint32_t = 32;
    pub const QIF_LIMITS: ::uint32_t = 5;
    pub const QIF_USAGE: ::uint32_t = 10;
    pub const QIF_TIMES: ::uint32_t = 48;
    pub const QIF_ALL: ::uint32_t = 63;

    pub const EFD_CLOEXEC: ::c_int = 0x80000;

    pub const MNT_FORCE: ::c_int = 0x1;

    pub const Q_SYNC: ::c_int = 0x800001;
    pub const Q_QUOTAON: ::c_int = 0x800002;
    pub const Q_QUOTAOFF: ::c_int = 0x800003;
    pub const Q_GETQUOTA: ::c_int = 0x800007;
    pub const Q_SETQUOTA: ::c_int = 0x800008;

    pub const TCIOFF: ::c_int = 2;
    pub const TCION: ::c_int = 3;
    pub const TCOOFF: ::c_int = 0;
    pub const TCOON: ::c_int = 1;
    pub const TCIFLUSH: ::c_int = 0;
    pub const TCOFLUSH: ::c_int = 1;
    pub const TCIOFLUSH: ::c_int = 2;
    pub const NL0: ::c_int  = 0x00000000;
    pub const NL1: ::c_int  = 0x00000100;
    pub const TAB0: ::c_int = 0x00000000;
    pub const CR0: ::c_int  = 0x00000000;
    pub const FF0: ::c_int  = 0x00000000;
    pub const BS0: ::c_int  = 0x00000000;
    pub const VT0: ::c_int  = 0x00000000;
    pub const VERASE: usize = 2;
    pub const VKILL: usize = 3;
    pub const VINTR: usize = 0;
    pub const VQUIT: usize = 1;
    pub const VLNEXT: usize = 15;
    pub const IGNBRK: ::tcflag_t = 0x00000001;
    pub const BRKINT: ::tcflag_t = 0x00000002;
    pub const IGNPAR: ::tcflag_t = 0x00000004;
    pub const PARMRK: ::tcflag_t = 0x00000008;
    pub const INPCK: ::tcflag_t = 0x00000010;
    pub const ISTRIP: ::tcflag_t = 0x00000020;
    pub const INLCR: ::tcflag_t = 0x00000040;
    pub const IGNCR: ::tcflag_t = 0x00000080;
    pub const ICRNL: ::tcflag_t = 0x00000100;
    pub const IXANY: ::tcflag_t = 0x00000800;
    pub const IMAXBEL: ::tcflag_t = 0x00002000;
    pub const OPOST: ::tcflag_t = 0x1;
    pub const CS5: ::tcflag_t = 0x00000000;
    pub const CRTSCTS: ::tcflag_t = 0x80000000;
    pub const ECHO: ::tcflag_t = 0x00000008;

    pub const CLONE_VM: ::c_int = 0x100;
    pub const CLONE_FS: ::c_int = 0x200;
    pub const CLONE_FILES: ::c_int = 0x400;
    pub const CLONE_SIGHAND: ::c_int = 0x800;
    pub const CLONE_PTRACE: ::c_int = 0x2000;
    pub const CLONE_VFORK: ::c_int = 0x4000;
    pub const CLONE_PARENT: ::c_int = 0x8000;
    pub const CLONE_THREAD: ::c_int = 0x10000;
    pub const CLONE_NEWNS: ::c_int = 0x20000;
    pub const CLONE_SYSVSEM: ::c_int = 0x40000;
    pub const CLONE_SETTLS: ::c_int = 0x80000;
    pub const CLONE_PARENT_SETTID: ::c_int = 0x100000;
    pub const CLONE_CHILD_CLEARTID: ::c_int = 0x200000;
    pub const CLONE_DETACHED: ::c_int = 0x400000;
    pub const CLONE_UNTRACED: ::c_int = 0x800000;
    pub const CLONE_CHILD_SETTID: ::c_int = 0x01000000;
    pub const CLONE_NEWUTS: ::c_int = 0x04000000;
    pub const CLONE_NEWIPC: ::c_int = 0x08000000;
    pub const CLONE_NEWUSER: ::c_int = 0x10000000;
    pub const CLONE_NEWPID: ::c_int = 0x20000000;
    pub const CLONE_NEWNET: ::c_int = 0x40000000;
    pub const CLONE_IO: ::c_int = 0x80000000;

    pub const WNOHANG: ::c_int = 0x00000001;
    pub const WUNTRACED: ::c_int = 0x00000002;
    pub const WSTOPPED: ::c_int = WUNTRACED;
    pub const WEXITED: ::c_int = 0x00000004;
    pub const WCONTINUED: ::c_int = 0x00000008;
    pub const WNOWAIT: ::c_int = 0x01000000;

    pub const __WNOTHREAD: ::c_int = 0x20000000;
    pub const __WALL: ::c_int = 0x40000000;
    pub const __WCLONE: ::c_int = 0x80000000;

    pub const SPLICE_F_MOVE: ::c_uint = 0x01;
    pub const SPLICE_F_NONBLOCK: ::c_uint = 0x02;
    pub const SPLICE_F_MORE: ::c_uint = 0x04;
    pub const SPLICE_F_GIFT: ::c_uint = 0x08;

    pub const RTLD_LOCAL: ::c_int = 0;

    pub const POSIX_FADV_NORMAL: ::c_int = 0;
    pub const POSIX_FADV_RANDOM: ::c_int = 1;
    pub const POSIX_FADV_SEQUENTIAL: ::c_int = 2;
    pub const POSIX_FADV_WILLNEED: ::c_int = 3;

    pub const AT_FDCWD: ::c_int = -100;
    pub const AT_SYMLINK_NOFOLLOW: ::c_int = 0x100;

    pub const LOG_CRON: ::c_int = 9 << 3;
    pub const LOG_AUTHPRIV: ::c_int = 10 << 3;
    pub const LOG_FTP: ::c_int = 11 << 3;
    pub const LOG_PERROR: ::c_int = 0x20;

    pub const PIPE_BUF: usize = 4096;

    pub const SI_LOAD_SHIFT: ::c_uint = 16;

    pub const SIGEV_SIGNAL: ::c_int = 0;
    pub const SIGEV_NONE: ::c_int = 1;
    pub const SIGEV_THREAD: ::c_int = 2;

    f! {
        pub fn FD_CLR(fd: ::c_int, set: *mut fd_set) -> () {
            let fd = fd as usize;
            let size = mem::size_of_val(&(*set).fds_bits[0]) * 8;
            (*set).fds_bits[fd / size] &= !(1 << (fd % size));
            return
        }

        pub fn FD_ISSET(fd: ::c_int, set: *mut fd_set) -> bool {
            let fd = fd as usize;
            let size = mem::size_of_val(&(*set).fds_bits[0]) * 8;
            return ((*set).fds_bits[fd / size] & (1 << (fd % size))) != 0
        }

        pub fn FD_SET(fd: ::c_int, set: *mut fd_set) -> () {
            let fd = fd as usize;
            let size = mem::size_of_val(&(*set).fds_bits[0]) * 8;
            (*set).fds_bits[fd / size] |= 1 << (fd % size);
            return
        }

        pub fn FD_ZERO(set: *mut fd_set) -> () {
            for slot in (*set).fds_bits.iter_mut() {
                *slot = 0;
            }
        }

        pub fn WIFSTOPPED(status: ::c_int) -> bool {
            (status & 0xff) == 0x7f
        }

        pub fn WSTOPSIG(status: ::c_int) -> ::c_int {
            (status >> 8) & 0xff
        }

        pub fn WIFSIGNALED(status: ::c_int) -> bool {
            (status & 0x7f) + 1 >= 2
        }

        pub fn WTERMSIG(status: ::c_int) -> ::c_int {
            status & 0x7f
        }

        pub fn WIFEXITED(status: ::c_int) -> bool {
            (status & 0x7f) == 0
        }

        pub fn WEXITSTATUS(status: ::c_int) -> ::c_int {
            (status >> 8) & 0xff
        }

        pub fn WCOREDUMP(status: ::c_int) -> bool {
            (status & 0x80) != 0
        }
    }

    extern {
        pub fn getpwnam_r(name: *const ::c_char,
                          pwd: *mut passwd,
                          buf: *mut ::c_char,
                          buflen: ::size_t,
                          result: *mut *mut passwd) -> ::c_int;
        pub fn getpwuid_r(uid: ::uid_t,
                          pwd: *mut passwd,
                          buf: *mut ::c_char,
                          buflen: ::size_t,
                          result: *mut *mut passwd) -> ::c_int;
        pub fn fdatasync(fd: ::c_int) -> ::c_int;
        pub fn mincore(addr: *mut ::c_void, len: ::size_t,
                       vec: *mut ::c_uchar) -> ::c_int;
        pub fn clock_getres(clk_id: clockid_t, tp: *mut ::timespec) -> ::c_int;
        pub fn clock_gettime(clk_id: clockid_t, tp: *mut ::timespec) -> ::c_int;
        pub fn clock_nanosleep(clk_id: clockid_t,
                               flags: ::c_int,
                               rqtp: *const ::timespec,
                               rmtp:  *mut ::timespec) -> ::c_int;
        pub fn prctl(option: ::c_int, ...) -> ::c_int;
        pub fn pthread_getattr_np(native: ::pthread_t,
                                  attr: *mut ::pthread_attr_t) -> ::c_int;
        pub fn pthread_attr_getguardsize(attr: *const ::pthread_attr_t,
                                         guardsize: *mut ::size_t) -> ::c_int;
        pub fn pthread_attr_getstack(attr: *const ::pthread_attr_t,
                                     stackaddr: *mut *mut ::c_void,
                                     stacksize: *mut ::size_t) -> ::c_int;
        pub fn memalign(align: ::size_t, size: ::size_t) -> *mut ::c_void;
        pub fn setgroups(ngroups: ::size_t,
                         ptr: *const ::gid_t) -> ::c_int;
        pub fn sched_setscheduler(pid: ::pid_t,
                                  policy: ::c_int,
                                  param: *const sched_param) -> ::c_int;
        pub fn sched_getscheduler(pid: ::pid_t) -> ::c_int;
        pub fn sched_get_priority_max(policy: ::c_int) -> ::c_int;
        pub fn sched_get_priority_min(policy: ::c_int) -> ::c_int;
        pub fn epoll_create(size: ::c_int) -> ::c_int;
        pub fn epoll_create1(flags: ::c_int) -> ::c_int;
        pub fn epoll_ctl(epfd: ::c_int,
                         op: ::c_int,
                         fd: ::c_int,
                         event: *mut epoll_event) -> ::c_int;
        pub fn epoll_wait(epfd: ::c_int,
                          events: *mut epoll_event,
                          maxevents: ::c_int,
                          timeout: ::c_int) -> ::c_int;
        pub fn pipe2(fds: *mut ::c_int, flags: ::c_int) -> ::c_int;
        pub fn mount(src: *const ::c_char,
                     target: *const ::c_char,
                     fstype: *const ::c_char,
                     flags: ::c_ulong,
                     data: *const ::c_void) -> ::c_int;
        pub fn umount(target: *const ::c_char) -> ::c_int;
        pub fn umount2(target: *const ::c_char, flags: ::c_int) -> ::c_int;
        pub fn clone(cb: extern fn(*mut ::c_void) -> ::c_int,
                     child_stack: *mut ::c_void,
                     flags: ::c_int,
                     arg: *mut ::c_void, ...) -> ::c_int;
        pub fn statfs(path: *const ::c_char, buf: *mut statfs) -> ::c_int;
        pub fn fstatfs(fd: ::c_int, buf: *mut statfs) -> ::c_int;
        pub fn memrchr(cx: *const ::c_void,
                       c: ::c_int,
                       n: ::size_t) -> *mut ::c_void;
        pub fn syscall(num: ::c_long, ...) -> ::c_long;
        pub fn sendfile(out_fd: ::c_int,
                        in_fd: ::c_int,
                        offset: *mut off_t,
                        count: ::size_t) -> ::ssize_t;
        pub fn splice(fd_in: ::c_int,
                      off_in: *mut ::loff_t,
                      fd_out: ::c_int,
                      off_out: *mut ::loff_t,
                      len: ::size_t,
                      flags: ::c_uint) -> ::ssize_t;
        pub fn tee(fd_in: ::c_int,
                   fd_out: ::c_int,
                   len: ::size_t,
                   flags: ::c_uint) -> ::ssize_t;
        pub fn vmsplice(fd: ::c_int,
                        iov: *const ::iovec,
                        nr_segs: ::size_t,
                        flags: ::c_uint) -> ::ssize_t;

        pub fn posix_fadvise(fd: ::c_int, offset: ::off_t, len: ::off_t,
                             advise: ::c_int) -> ::c_int;
        pub fn futimens(fd: ::c_int, times: *const ::timespec) -> ::c_int;
        pub fn utimensat(dirfd: ::c_int, path: *const ::c_char,
                         times: *const ::timespec, flag: ::c_int) -> ::c_int;
        pub fn duplocale(base: ::locale_t) -> ::locale_t;
        pub fn freelocale(loc: ::locale_t);
        pub fn newlocale(mask: ::c_int,
                         locale: *const ::c_char,
                         base: ::locale_t) -> ::locale_t;
        pub fn uselocale(loc: ::locale_t) -> ::locale_t;
        pub fn creat64(path: *const c_char, mode: mode_t) -> ::c_int;
        pub fn fstat64(fildes: ::c_int, buf: *mut stat64) -> ::c_int;
        pub fn ftruncate64(fd: ::c_int, length: off64_t) -> ::c_int;
        pub fn getrlimit64(resource: ::c_int, rlim: *mut rlimit64) -> ::c_int;
        pub fn lseek64(fd: ::c_int, offset: off64_t, whence: ::c_int) -> off64_t;
        pub fn lstat64(path: *const c_char, buf: *mut stat64) -> ::c_int;
        pub fn mmap64(addr: *mut ::c_void,
                      len: ::size_t,
                      prot: ::c_int,
                      flags: ::c_int,
                      fd: ::c_int,
                      offset: off64_t)
                      -> *mut ::c_void;
        pub fn open64(path: *const c_char, oflag: ::c_int, ...) -> ::c_int;
        pub fn pread64(fd: ::c_int, buf: *mut ::c_void, count: ::size_t,
                       offset: off64_t) -> ::ssize_t;
        pub fn pwrite64(fd: ::c_int, buf: *const ::c_void, count: ::size_t,
                        offset: off64_t) -> ::ssize_t;
        pub fn readdir64_r(dirp: *mut ::DIR, entry: *mut ::dirent64,
                           result: *mut *mut ::dirent64) -> ::c_int;
        pub fn setrlimit64(resource: ::c_int, rlim: *const rlimit64) -> ::c_int;
        pub fn stat64(path: *const c_char, buf: *mut stat64) -> ::c_int;
        pub fn eventfd(init: ::c_uint, flags: ::c_int) -> ::c_int;
        pub fn sysinfo (info: *mut ::sysinfo) -> ::c_int;

        pub fn openat(dirfd: ::c_int, pathname: *const ::c_char,
                      flags: ::c_int, ...) -> ::c_int;
        pub fn faccessat(dirfd: ::c_int, pathname: *const ::c_char,
                         mode: ::c_int, flags: ::c_int) -> ::c_int;
        pub fn fchmodat(dirfd: ::c_int, pathname: *const ::c_char,
                        mode: ::mode_t, flags: ::c_int) -> ::c_int;
        pub fn fchownat(dirfd: ::c_int, pathname: *const ::c_char,
                        owner: ::uid_t, group: ::gid_t,
                        flags: ::c_int) -> ::c_int;
        pub fn fstatat(dirfd: ::c_int, pathname: *const ::c_char,
                       buf: *mut stat, flags: ::c_int) -> ::c_int;
        pub fn linkat(olddirfd: ::c_int, oldpath: *const ::c_char,
                      newdirfd: ::c_int, newpath: *const ::c_char,
                      flags: ::c_int) -> ::c_int;
        pub fn mkdirat(dirfd: ::c_int, pathname: *const ::c_char,
                       mode: ::mode_t) -> ::c_int;
        pub fn mknodat(dirfd: ::c_int, pathname: *const ::c_char,
                       mode: ::mode_t, dev: dev_t) -> ::c_int;
        pub fn readlinkat(dirfd: ::c_int, pathname: *const ::c_char,
                          buf: *mut ::c_char, bufsiz: ::size_t) -> ::ssize_t;
        pub fn renameat(olddirfd: ::c_int, oldpath: *const ::c_char,
                        newdirfd: ::c_int, newpath: *const ::c_char)
                        -> ::c_int;
        pub fn symlinkat(target: *const ::c_char, newdirfd: ::c_int,
                         linkpath: *const ::c_char) -> ::c_int;
        pub fn unlinkat(dirfd: ::c_int, pathname: *const ::c_char,
                        flags: ::c_int) -> ::c_int;
        pub fn pthread_condattr_getclock(attr: *const pthread_condattr_t,
                                         clock_id: *mut clockid_t) -> ::c_int;
        pub fn pthread_condattr_setclock(attr: *mut pthread_condattr_t,
                                         clock_id: clockid_t) -> ::c_int;
        pub fn sched_getaffinity(pid: ::pid_t,
                                 cpusetsize: ::size_t,
                                 cpuset: *mut cpu_set_t) -> ::c_int;
        pub fn sched_setaffinity(pid: ::pid_t,
                                 cpusetsize: ::size_t,
                                 cpuset: *const cpu_set_t) -> ::c_int;
        pub fn unshare(flags: ::c_int) -> ::c_int;
        pub fn setns(fd: ::c_int, nstype: ::c_int) -> ::c_int;
        pub fn sem_timedwait(sem: *mut sem_t,
                             abstime: *const ::timespec) -> ::c_int;
        pub fn accept4(fd: ::c_int, addr: *mut ::sockaddr, len: *mut ::socklen_t,
                       flg: ::c_int) -> ::c_int;
        pub fn pthread_mutex_timedlock(lock: *mut pthread_mutex_t,
                                       abstime: *const ::timespec) -> ::c_int;
        pub fn ptsname_r(fd: ::c_int,
                         buf: *mut ::c_char,
                         buflen: ::size_t) -> ::c_int;
    }

    cfg_if! {
        if #[cfg(any(target_os = "linux",
                     target_os = "emscripten",
                     target_os = "fuchsia"))] {
            mod linux;
            pub use self::linux::*;
        } else if #[cfg(target_os = "android")] {
            mod android;
            pub use self::android::*;
        } else {
            // Unknown target_os
        }
    }

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