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<section id='main' class="content source"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><pre class='rust '>
<span class='doccomment'>//! Implementation of `errno` functionality for Unix systems.</span>
<span class='doccomment'>//!</span>
<span class='doccomment'>//! Adapted from `src/libstd/sys/unix/os.rs` in the Rust distribution.</span>
<span class='comment'>// Copyright 2015 The Rust Project Developers. See the COPYRIGHT</span>
<span class='comment'>// file at the top-level directory of this distribution and at</span>
<span class='comment'>// http://rust-lang.org/COPYRIGHT.</span>
<span class='comment'>//</span>
<span class='comment'>// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span>
<span class='comment'>// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class='comment'>// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span>
<span class='comment'>// option. This file may not be copied, modified, or distributed</span>
<span class='comment'>// except according to those terms.</span>
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>ffi</span>::<span class='ident'>CStr</span>;
<span class='kw'>use</span> <span class='ident'>libc</span>::{<span class='self'>self</span>, <span class='ident'>c_char</span>, <span class='ident'>c_int</span>};
<span class='kw'>use</span> <span class='ident'>Errno</span>;
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>with_description</span><span class='op'><</span><span class='ident'>F</span>, <span class='ident'>T</span><span class='op'>></span>(<span class='ident'>err</span>: <span class='ident'>Errno</span>, <span class='ident'>callback</span>: <span class='ident'>F</span>) <span class='op'>-></span> <span class='ident'>T</span> <span class='kw'>where</span>
<span class='ident'>F</span>: <span class='ident'>FnOnce</span>(<span class='prelude-ty'>Result</span><span class='op'><</span><span class='kw-2'>&</span><span class='ident'>str</span>, <span class='ident'>Errno</span><span class='op'>></span>) <span class='op'>-></span> <span class='ident'>T</span>
{
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>buf</span> <span class='op'>=</span> [<span class='number'>0</span> <span class='kw'>as</span> <span class='ident'>c_char</span>; <span class='number'>1024</span>];
<span class='kw'>unsafe</span> {
<span class='kw'>if</span> <span class='ident'>strerror_r</span>(<span class='ident'>err</span>.<span class='number'>0</span>, <span class='ident'>buf</span>.<span class='ident'>as_mut_ptr</span>(), <span class='ident'>buf</span>.<span class='ident'>len</span>() <span class='kw'>as</span> <span class='ident'>libc</span>::<span class='ident'>size_t</span>) <span class='op'><</span> <span class='number'>0</span> {
<span class='kw'>let</span> <span class='ident'>fm_err</span> <span class='op'>=</span> <span class='ident'>errno</span>();
<span class='kw'>if</span> <span class='ident'>fm_err</span> <span class='op'>!=</span> <span class='ident'>Errno</span>(<span class='ident'>libc</span>::<span class='ident'>ERANGE</span>) {
<span class='kw'>return</span> <span class='ident'>callback</span>(<span class='prelude-val'>Err</span>(<span class='ident'>fm_err</span>));
}
}
}
<span class='kw'>let</span> <span class='ident'>c_str</span> <span class='op'>=</span> <span class='kw'>unsafe</span> { <span class='ident'>CStr</span>::<span class='ident'>from_ptr</span>(<span class='ident'>buf</span>.<span class='ident'>as_ptr</span>()) };
<span class='ident'>callback</span>(<span class='prelude-val'>Ok</span>(<span class='kw-2'>&</span><span class='ident'>String</span>::<span class='ident'>from_utf8_lossy</span>(<span class='ident'>c_str</span>.<span class='ident'>to_bytes</span>())))
}
<span class='kw'>pub</span> <span class='kw'>const</span> <span class='ident'>STRERROR_NAME</span>: <span class='kw-2'>&</span><span class='lifetime'>'static</span> <span class='ident'>str</span> <span class='op'>=</span> <span class='string'>"strerror_r"</span>;
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>errno</span>() <span class='op'>-></span> <span class='ident'>Errno</span> {
<span class='kw'>unsafe</span> {
<span class='ident'>Errno</span>(<span class='kw-2'>*</span><span class='ident'>errno_location</span>())
}
}
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>set_errno</span>(<span class='ident'>Errno</span>(<span class='ident'>errno</span>): <span class='ident'>Errno</span>) {
<span class='kw'>unsafe</span> {
<span class='kw-2'>*</span><span class='ident'>errno_location</span>() <span class='op'>=</span> <span class='ident'>errno</span>;
}
}
<span class='kw'>extern</span> {
<span class='attribute'>#[<span class='ident'>cfg_attr</span>(<span class='ident'>any</span>(<span class='ident'>target_os</span> <span class='op'>=</span> <span class='string'>"macos"</span>,
<span class='ident'>target_os</span> <span class='op'>=</span> <span class='string'>"ios"</span>,
<span class='ident'>target_os</span> <span class='op'>=</span> <span class='string'>"freebsd"</span>),
<span class='ident'>link_name</span> <span class='op'>=</span> <span class='string'>"__error"</span>)]</span>
<span class='attribute'>#[<span class='ident'>cfg_attr</span>(<span class='ident'>target_os</span> <span class='op'>=</span> <span class='string'>"dragonfly"</span>,
<span class='ident'>link_name</span> <span class='op'>=</span> <span class='string'>"__dfly_error"</span>)]</span>
<span class='attribute'>#[<span class='ident'>cfg_attr</span>(<span class='ident'>any</span>(<span class='ident'>target_os</span> <span class='op'>=</span> <span class='string'>"openbsd"</span>, <span class='ident'>target_os</span> <span class='op'>=</span> <span class='string'>"bitrig"</span>, <span class='ident'>target_os</span> <span class='op'>=</span> <span class='string'>"android"</span>),
<span class='ident'>link_name</span> <span class='op'>=</span> <span class='string'>"__errno"</span>)]</span>
<span class='attribute'>#[<span class='ident'>cfg_attr</span>(<span class='ident'>target_os</span> <span class='op'>=</span> <span class='string'>"linux"</span>,
<span class='ident'>link_name</span> <span class='op'>=</span> <span class='string'>"__errno_location"</span>)]</span>
<span class='kw'>fn</span> <span class='ident'>errno_location</span>() <span class='op'>-></span> <span class='kw-2'>*</span><span class='kw-2'>mut</span> <span class='ident'>c_int</span>;
<span class='attribute'>#[<span class='ident'>cfg_attr</span>(<span class='ident'>target_os</span> <span class='op'>=</span> <span class='string'>"linux"</span>, <span class='ident'>link_name</span> <span class='op'>=</span> <span class='string'>"__xpg_strerror_r"</span>)]</span>
<span class='kw'>fn</span> <span class='ident'>strerror_r</span>(<span class='ident'>errnum</span>: <span class='ident'>c_int</span>, <span class='ident'>buf</span>: <span class='kw-2'>*</span><span class='kw-2'>mut</span> <span class='ident'>c_char</span>,
<span class='ident'>buflen</span>: <span class='ident'>libc</span>::<span class='ident'>size_t</span>) <span class='op'>-></span> <span class='ident'>c_int</span>;
}
</pre>
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