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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.
// FIXME: move various extern bindings from here into liblibc or
// something similar
use libc;
use libc::{c_int, c_char, c_void};
use prelude::*;
use io::{IoResult, IoError};
use sys::fs::FileDesc;
use ptr;
use os::TMPBUF_SZ;
pub fn errno() -> uint {
use libc::types::os::arch::extra::DWORD;
#[link_name = "kernel32"]
extern "system" {
fn GetLastError() -> DWORD;
}
unsafe {
GetLastError() as uint
}
}
/// Get a detailed string description for the given error number
pub fn error_string(errnum: i32) -> String {
use libc::types::os::arch::extra::DWORD;
use libc::types::os::arch::extra::LPWSTR;
use libc::types::os::arch::extra::LPVOID;
use libc::types::os::arch::extra::WCHAR;
#[link_name = "kernel32"]
extern "system" {
fn FormatMessageW(flags: DWORD,
lpSrc: LPVOID,
msgId: DWORD,
langId: DWORD,
buf: LPWSTR,
nsize: DWORD,
args: *const c_void)
-> DWORD;
}
static FORMAT_MESSAGE_FROM_SYSTEM: DWORD = 0x00001000;
static FORMAT_MESSAGE_IGNORE_INSERTS: DWORD = 0x00000200;
// This value is calculated from the macro
// MAKELANGID(LANG_SYSTEM_DEFAULT, SUBLANG_SYS_DEFAULT)
let langId = 0x0800 as DWORD;
let mut buf = [0 as WCHAR, ..TMPBUF_SZ];
unsafe {
let res = FormatMessageW(FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
ptr::null_mut(),
errnum as DWORD,
langId,
buf.as_mut_ptr(),
buf.len() as DWORD,
ptr::null());
if res == 0 {
// Sometimes FormatMessageW can fail e.g. system doesn't like langId,
let fm_err = errno();
return format!("OS Error {} (FormatMessageW() returned error {})", errnum, fm_err);
}
let msg = String::from_utf16(::str::truncate_utf16_at_nul(buf));
match msg {
Some(msg) => format!("OS Error {}: {}", errnum, msg),
None => format!("OS Error {} (FormatMessageW() returned invalid UTF-16)", errnum),
}
}
}
pub unsafe fn pipe() -> IoResult<(FileDesc, FileDesc)> {
// Windows pipes work subtly differently than unix pipes, and their
// inheritance has to be handled in a different way that I do not
// fully understand. Here we explicitly make the pipe non-inheritable,
// which means to pass it to a subprocess they need to be duplicated
// first, as in std::run.
let mut fds = [0, ..2];
match libc::pipe(fds.as_mut_ptr(), 1024 as ::libc::c_uint,
(libc::O_BINARY | libc::O_NOINHERIT) as c_int) {
0 => {
assert!(fds[0] != -1 && fds[0] != 0);
assert!(fds[1] != -1 && fds[1] != 0);
Ok((FileDesc::new(fds[0], true), FileDesc::new(fds[1], true)))
}
_ => Err(IoError::last_error()),
}
}
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