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    #![allow(missing_docs, nonstandard_style)]

    use crate::io::ErrorKind;

    #[cfg(any(doc, target_os = "linux"))]
    pub use crate::os::linux as platform;

    #[cfg(all(not(doc), target_os = "android"))]
    pub use crate::os::android as platform;
    #[cfg(all(not(doc), target_os = "dragonfly"))]
    pub use crate::os::dragonfly as platform;
    #[cfg(all(not(doc), target_os = "emscripten"))]
    pub use crate::os::emscripten as platform;
    #[cfg(all(not(doc), target_os = "freebsd"))]
    pub use crate::os::freebsd as platform;
    #[cfg(all(not(doc), target_os = "fuchsia"))]
    pub use crate::os::fuchsia as platform;
    #[cfg(all(not(doc), target_os = "haiku"))]
    pub use crate::os::haiku as platform;
    #[cfg(all(not(doc), target_os = "illumos"))]
    pub use crate::os::illumos as platform;
    #[cfg(all(not(doc), target_os = "ios"))]
    pub use crate::os::ios as platform;
    #[cfg(all(not(doc), target_os = "l4re"))]
    pub use crate::os::linux as platform;
    #[cfg(all(not(doc), target_os = "macos"))]
    pub use crate::os::macos as platform;
    #[cfg(all(not(doc), target_os = "netbsd"))]
    pub use crate::os::netbsd as platform;
    #[cfg(all(not(doc), target_os = "openbsd"))]
    pub use crate::os::openbsd as platform;
    #[cfg(all(not(doc), target_os = "redox"))]
    pub use crate::os::redox as platform;
    #[cfg(all(not(doc), target_os = "solaris"))]
    pub use crate::os::solaris as platform;

    pub use self::rand::hashmap_random_keys;
    pub use libc::strlen;

    #[macro_use]
    pub mod weak;

    pub mod alloc;
    pub mod android;
    pub mod args;
    pub mod cmath;
    pub mod condvar;
    pub mod env;
    pub mod ext;
    pub mod fd;
    pub mod fs;
    pub mod futex;
    pub mod io;
    #[cfg(any(target_os = "linux", target_os = "android"))]
    pub mod kernel_copy;
    #[cfg(target_os = "l4re")]
    mod l4re;
    pub mod memchr;
    pub mod mutex;
    #[cfg(not(target_os = "l4re"))]
    pub mod net;
    #[cfg(target_os = "l4re")]
    pub use self::l4re::net;
    pub mod os;
    pub mod path;
    pub mod pipe;
    pub mod process;
    pub mod rand;
    pub mod rwlock;
    pub mod stack_overflow;
    pub mod stdio;
    pub mod thread;
    pub mod thread_local_dtor;
    pub mod thread_local_key;
    pub mod time;

    pub use crate::sys_common::os_str_bytes as os_str;

    #[cfg(not(test))]
    pub fn init() {
        // The standard streams might be closed on application startup. To prevent
        // std::io::{stdin, stdout,stderr} objects from using other unrelated file
        // resources opened later, we reopen standards streams when they are closed.
        unsafe {
            sanitize_standard_fds();
        }

        // By default, some platforms will send a *signal* when an EPIPE error
        // would otherwise be delivered. This runtime doesn't install a SIGPIPE
        // handler, causing it to kill the program, which isn't exactly what we
        // want!
        //
        // Hence, we set SIGPIPE to ignore when the program starts up in order
        // to prevent this problem.
        unsafe {
            reset_sigpipe();
        }

        cfg_if::cfg_if! {
            if #[cfg(miri)] {
                // The standard fds are always available in Miri.
                unsafe fn sanitize_standard_fds() {}
            } else if #[cfg(not(any(
                target_os = "emscripten",
                target_os = "fuchsia",
                // The poll on Darwin doesn't set POLLNVAL for closed fds.
                target_os = "macos",
                target_os = "ios",
                target_os = "redox",
            )))] {
                // In the case when all file descriptors are open, the poll has been
                // observed to perform better than fcntl (on GNU/Linux).
                unsafe fn sanitize_standard_fds() {
                    use crate::sys::os::errno;
                    let pfds: &mut [_] = &mut [
                        libc::pollfd { fd: 0, events: 0, revents: 0 },
                        libc::pollfd { fd: 1, events: 0, revents: 0 },
                        libc::pollfd { fd: 2, events: 0, revents: 0 },
                    ];
                    while libc::poll(pfds.as_mut_ptr(), 3, 0) == -1 {
                        if errno() == libc::EINTR {
                            continue;
                        }
                        libc::abort();
                    }
                    for pfd in pfds {
                        if pfd.revents & libc::POLLNVAL == 0 {
                            continue;
                        }
                        if libc::open("/dev/null\0".as_ptr().cast(), libc::O_RDWR, 0) == -1 {
                            // If the stream is closed but we failed to reopen it, abort the
                            // process. Otherwise we wouldn't preserve the safety of
                            // operations on the corresponding Rust object Stdin, Stdout, or
                            // Stderr.
                            libc::abort();
                        }
                    }
                }
            } else if #[cfg(any(target_os = "macos", target_os = "ios", target_os = "redox"))] {
                unsafe fn sanitize_standard_fds() {
                    use crate::sys::os::errno;
                    for fd in 0..3 {
                        if libc::fcntl(fd, libc::F_GETFD) == -1 && errno() == libc::EBADF {
                            if libc::open("/dev/null\0".as_ptr().cast(), libc::O_RDWR, 0) == -1 {
                                libc::abort();
                            }
                        }
                    }
                }
            } else {
                unsafe fn sanitize_standard_fds() {}
            }
        }

        #[cfg(not(any(target_os = "emscripten", target_os = "fuchsia")))]
        unsafe fn reset_sigpipe() {
            assert!(signal(libc::SIGPIPE, libc::SIG_IGN) != libc::SIG_ERR);
        }
        #[cfg(any(target_os = "emscripten", target_os = "fuchsia"))]
        unsafe fn reset_sigpipe() {}
    }

    #[cfg(target_os = "android")]
    pub use crate::sys::android::signal;
    #[cfg(not(target_os = "android"))]
    pub use libc::signal;

    pub fn decode_error_kind(errno: i32) -> ErrorKind {
        match errno as libc::c_int {
            libc::ECONNREFUSED => ErrorKind::ConnectionRefused,
            libc::ECONNRESET => ErrorKind::ConnectionReset,
            libc::EPERM | libc::EACCES => ErrorKind::PermissionDenied,
            libc::EPIPE => ErrorKind::BrokenPipe,
            libc::ENOTCONN => ErrorKind::NotConnected,
            libc::ECONNABORTED => ErrorKind::ConnectionAborted,
            libc::EADDRNOTAVAIL => ErrorKind::AddrNotAvailable,
            libc::EADDRINUSE => ErrorKind::AddrInUse,
            libc::ENOENT => ErrorKind::NotFound,
            libc::EINTR => ErrorKind::Interrupted,
            libc::EINVAL => ErrorKind::InvalidInput,
            libc::ETIMEDOUT => ErrorKind::TimedOut,
            libc::EEXIST => ErrorKind::AlreadyExists,

            // These two constants can have the same value on some systems,
            // but different values on others, so we can't use a match
            // clause
            x if x == libc::EAGAIN || x == libc::EWOULDBLOCK => ErrorKind::WouldBlock,

            _ => ErrorKind::Other,
        }
    }

    #[doc(hidden)]
    pub trait IsMinusOne {
        fn is_minus_one(&self) -> bool;
    }

    macro_rules! impl_is_minus_one {
        ($($t:ident)*) => ($(impl IsMinusOne for $t {
            fn is_minus_one(&self) -> bool {
                *self == -1
            }
        })*)
    }

    impl_is_minus_one! { i8 i16 i32 i64 isize }

    pub fn cvt<T: IsMinusOne>(t: T) -> crate::io::Result<T> {
        if t.is_minus_one() { Err(crate::io::Error::last_os_error()) } else { Ok(t) }
    }

    pub fn cvt_r<T, F>(mut f: F) -> crate::io::Result<T>
    where
        T: IsMinusOne,
        F: FnMut() -> T,
    {
        loop {
            match cvt(f()) {
                Err(ref e) if e.kind() == ErrorKind::Interrupted => {}
                other => return other,
            }
        }
    }

    pub fn cvt_nz(error: libc::c_int) -> crate::io::Result<()> {
        if error == 0 { Ok(()) } else { Err(crate::io::Error::from_raw_os_error(error)) }
    }

    // On Unix-like platforms, libc::abort will unregister signal handlers
    // including the SIGABRT handler, preventing the abort from being blocked, and
    // fclose streams, with the side effect of flushing them so libc buffered
    // output will be printed.  Additionally the shell will generally print a more
    // understandable error message like "Abort trap" rather than "Illegal
    // instruction" that intrinsics::abort would cause, as intrinsics::abort is
    // implemented as an illegal instruction.
    pub fn abort_internal() -> ! {
        unsafe { libc::abort() }
    }

    cfg_if::cfg_if! {
        if #[cfg(target_os = "android")] {
            #[link(name = "dl")]
            #[link(name = "log")]
            #[link(name = "gcc")]
            extern "C" {}
        } else if #[cfg(target_os = "freebsd")] {
            #[link(name = "execinfo")]
            #[link(name = "pthread")]
            extern "C" {}
        } else if #[cfg(target_os = "netbsd")] {
            #[link(name = "pthread")]
            #[link(name = "rt")]
            extern "C" {}
        } else if #[cfg(any(target_os = "dragonfly", target_os = "openbsd"))] {
            #[link(name = "pthread")]
            extern "C" {}
        } else if #[cfg(target_os = "solaris")] {
            #[link(name = "socket")]
            #[link(name = "posix4")]
            #[link(name = "pthread")]
            #[link(name = "resolv")]
            extern "C" {}
        } else if #[cfg(target_os = "illumos")] {
            #[link(name = "socket")]
            #[link(name = "posix4")]
            #[link(name = "pthread")]
            #[link(name = "resolv")]
            #[link(name = "nsl")]
            // Use libumem for the (malloc-compatible) allocator
            #[link(name = "umem")]
            extern "C" {}
        } else if #[cfg(target_os = "macos")] {
            #[link(name = "System")]
            // res_init and friends require -lresolv on macOS/iOS.
            // See #41582 and http://blog.achernya.com/2013/03/os-x-has-silly-libsystem.html
            #[link(name = "resolv")]
            extern "C" {}
        } else if #[cfg(target_os = "ios")] {
            #[link(name = "System")]
            #[link(name = "objc")]
            #[link(name = "Security", kind = "framework")]
            #[link(name = "Foundation", kind = "framework")]
            #[link(name = "resolv")]
            extern "C" {}
        } else if #[cfg(target_os = "fuchsia")] {
            #[link(name = "zircon")]
            #[link(name = "fdio")]
            extern "C" {}
        }
    }