1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
//! Implementation of `errno` functionality for WASI.
//!
//! Adapted from `unix.rs`.
// Copyright 2015 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.
#[cfg(feature = "std")]
use std::ffi::CStr;
use libc::c_int;
#[cfg(feature = "std")]
use libc::{self, c_char};
use Errno;
#[cfg(feature = "std")]
pub fn with_description<F, T>(err: Errno, callback: F) -> T where
F: FnOnce(Result<&str, Errno>) -> T
{
let mut buf = [0 as c_char; 1024];
unsafe {
if strerror_r(err.0, buf.as_mut_ptr(), buf.len() as libc::size_t) < 0 {
let fm_err = errno();
if fm_err != Errno(libc::ERANGE) {
return callback(Err(fm_err));
}
}
}
let c_str = unsafe { CStr::from_ptr(buf.as_ptr()) };
callback(Ok(&String::from_utf8_lossy(c_str.to_bytes())))
}
#[cfg(feature = "std")]
pub const STRERROR_NAME: &'static str = "strerror_r";
pub fn errno() -> Errno {
// libc_errno is thread-local, so simply read its value.
unsafe {
Errno(libc_errno)
}
}
pub fn set_errno(Errno(new_errno): Errno) {
// libc_errno is thread-local, so simply assign to it.
unsafe {
libc_errno = new_errno;
}
}
extern {
#[thread_local]
#[link_name = "errno"]
static mut libc_errno: c_int;
#[cfg(feature = "std")]
fn strerror_r(errnum: c_int, buf: *mut c_char,
buflen: libc::size_t) -> c_int;
}
|
