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// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use libc;
use libc::{c_int, c_char};
use prelude::*;
use io::IoResult;
use sys::fs::FileDesc;
use os::TMPBUF_SZ;
/// Returns the platform-specific value of errno
pub fn errno() -> int {
#[cfg(any(target_os = "macos",
target_os = "ios",
target_os = "freebsd"))]
fn errno_location() -> *const c_int {
extern {
fn __error() -> *const c_int;
}
unsafe {
__error()
}
}
#[cfg(target_os = "dragonfly")]
fn errno_location() -> *const c_int {
extern {
fn __dfly_error() -> *const c_int;
}
unsafe {
__dfly_error()
}
}
#[cfg(any(target_os = "linux", target_os = "android"))]
fn errno_location() -> *const c_int {
extern {
fn __errno_location() -> *const c_int;
}
unsafe {
__errno_location()
}
}
unsafe {
(*errno_location()) as int
}
}
/// Get a detailed string description for the given error number
pub fn error_string(errno: i32) -> String {
#[cfg(any(target_os = "macos",
target_os = "ios",
target_os = "android",
target_os = "freebsd",
target_os = "dragonfly"))]
fn strerror_r(errnum: c_int, buf: *mut c_char, buflen: libc::size_t)
-> c_int {
extern {
fn strerror_r(errnum: c_int, buf: *mut c_char,
buflen: libc::size_t) -> c_int;
}
unsafe {
strerror_r(errnum, buf, buflen)
}
}
// GNU libc provides a non-compliant version of strerror_r by default
// and requires macros to instead use the POSIX compliant variant.
// So we just use __xpg_strerror_r which is always POSIX compliant
#[cfg(target_os = "linux")]
fn strerror_r(errnum: c_int, buf: *mut c_char,
buflen: libc::size_t) -> c_int {
extern {
fn __xpg_strerror_r(errnum: c_int,
buf: *mut c_char,
buflen: libc::size_t)
-> c_int;
}
unsafe {
__xpg_strerror_r(errnum, buf, buflen)
}
}
let mut buf = [0 as c_char, ..TMPBUF_SZ];
let p = buf.as_mut_ptr();
unsafe {
if strerror_r(errno as c_int, p, buf.len() as libc::size_t) < 0 {
panic!("strerror_r failure");
}
::string::raw::from_buf(p as *const u8)
}
}
pub unsafe fn pipe() -> IoResult<(FileDesc, FileDesc)> {
let mut fds = [0, ..2];
if libc::pipe(fds.as_mut_ptr()) == 0 {
Ok((FileDesc::new(fds[0], true), FileDesc::new(fds[1], true)))
} else {
Err(super::last_error())
}
}
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