sysctl 0.1.1

Simplified Rust interface to libc::sysctl
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</pre><pre class='rust '>
<span class='doccomment'>//! Cross-platform interface to the `errno` variable.</span>

<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>unix</span>)]</span> <span class='kw'>extern</span> <span class='kw'>crate</span> <span class='ident'>libc</span>;
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>windows</span>)]</span> <span class='kw'>extern</span> <span class='kw'>crate</span> <span class='ident'>winapi</span>;
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>windows</span>)]</span> <span class='kw'>extern</span> <span class='kw'>crate</span> <span class='ident'>kernel32</span>;

<span class='comment'>// FIXME(#10): Rust &lt; 1.11 doesn&#39;t support cfg_attr on path</span>
<span class='comment'>/*
#[cfg_attr(unix, path = &quot;unix.rs&quot;)]
#[cfg_attr(windows, path = &quot;windows.rs&quot;)]
mod sys;
*/</span>

<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>unix</span>)]</span> <span class='kw'>mod</span> <span class='ident'>unix</span>;
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>unix</span>)]</span> <span class='kw'>mod</span> <span class='ident'>sys</span> { <span class='kw'>pub</span> <span class='kw'>use</span> <span class='ident'>unix</span>::<span class='kw-2'>*</span>; }
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>windows</span>)]</span> <span class='kw'>mod</span> <span class='ident'>windows</span>;
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>windows</span>)]</span> <span class='kw'>mod</span> <span class='ident'>sys</span> { <span class='kw'>pub</span> <span class='kw'>use</span> <span class='ident'>windows</span>::<span class='kw-2'>*</span>; }

<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>fmt</span>;

<span class='doccomment'>/// Wraps a platform-specific error code.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The `Display` instance maps the code to a human-readable string. It</span>
<span class='doccomment'>/// calls [`strerror_r`][1] under POSIX, and [`FormatMessageW`][2] on</span>
<span class='doccomment'>/// Windows.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// [1]: http://pubs.opengroup.org/onlinepubs/009695399/functions/strerror.html</span>
<span class='doccomment'>/// [2]: https://msdn.microsoft.com/en-us/library/windows/desktop/ms679351%28v=vs.85%29.aspx</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Copy</span>, <span class='ident'>Clone</span>, <span class='ident'>Eq</span>, <span class='ident'>Ord</span>, <span class='ident'>PartialEq</span>, <span class='ident'>PartialOrd</span>, <span class='ident'>Hash</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>Errno</span>(<span class='kw'>pub</span> <span class='ident'>i32</span>);

<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Debug</span> <span class='kw'>for</span> <span class='ident'>Errno</span> {
    <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>fmt</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-&gt;</span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
        <span class='ident'>sys</span>::<span class='ident'>with_description</span>(<span class='kw-2'>*</span><span class='self'>self</span>, <span class='op'>|</span><span class='ident'>desc</span><span class='op'>|</span> {
            <span class='ident'>fmt</span>.<span class='ident'>debug_struct</span>(<span class='string'>&quot;Errno&quot;</span>)
                .<span class='ident'>field</span>(<span class='string'>&quot;code&quot;</span>, <span class='kw-2'>&amp;</span><span class='self'>self</span>.<span class='number'>0</span>)
                .<span class='ident'>field</span>(<span class='string'>&quot;description&quot;</span>, <span class='kw-2'>&amp;</span><span class='ident'>desc</span>.<span class='ident'>ok</span>())
                .<span class='ident'>finish</span>()
        })
    }
}

<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Display</span> <span class='kw'>for</span> <span class='ident'>Errno</span> {
    <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>fmt</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-&gt;</span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
        <span class='ident'>sys</span>::<span class='ident'>with_description</span>(<span class='kw-2'>*</span><span class='self'>self</span>, <span class='op'>|</span><span class='ident'>desc</span><span class='op'>|</span> <span class='kw'>match</span> <span class='ident'>desc</span> {
            <span class='prelude-val'>Ok</span>(<span class='ident'>desc</span>) <span class='op'>=&gt;</span> <span class='ident'>fmt</span>.<span class='ident'>write_str</span>(<span class='kw-2'>&amp;</span><span class='ident'>desc</span>),
            <span class='prelude-val'>Err</span>(<span class='ident'>fm_err</span>) <span class='op'>=&gt;</span> <span class='macro'>write</span><span class='macro'>!</span>(
                <span class='ident'>fmt</span>, <span class='string'>&quot;OS error {} ({} returned error {})&quot;</span>,
                <span class='self'>self</span>.<span class='number'>0</span>, <span class='ident'>sys</span>::<span class='ident'>STRERROR_NAME</span>, <span class='ident'>fm_err</span>.<span class='number'>0</span>),
        })
    }
}

<span class='doccomment'>/// Returns the platform-specific value of `errno`.</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>errno</span>() <span class='op'>-&gt;</span> <span class='ident'>Errno</span> {
    <span class='ident'>sys</span>::<span class='ident'>errno</span>()
}

<span class='doccomment'>/// Sets the platform-specific value of `errno`.</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>set_errno</span>(<span class='ident'>err</span>: <span class='ident'>Errno</span>) {
    <span class='ident'>sys</span>::<span class='ident'>set_errno</span>(<span class='ident'>err</span>)
}

<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>it_works</span>() {
    <span class='kw'>let</span> <span class='ident'>x</span> <span class='op'>=</span> <span class='ident'>errno</span>();
    <span class='ident'>set_errno</span>(<span class='ident'>x</span>);
    <span class='kw'>let</span> _ <span class='op'>=</span> <span class='ident'>x</span>.<span class='ident'>to_string</span>();
}

<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>check_description</span>() {
    <span class='kw'>let</span> <span class='ident'>expect</span> <span class='op'>=</span> <span class='kw'>if</span> <span class='macro'>cfg</span><span class='macro'>!</span>(<span class='ident'>windows</span>) {
        <span class='string'>&quot;Incorrect function.&quot;</span>
    } <span class='kw'>else</span> {
        <span class='string'>&quot;Operation not permitted&quot;</span>
    };

    <span class='ident'>set_errno</span>(<span class='ident'>Errno</span>(<span class='number'>1</span>));

    <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>errno</span>().<span class='ident'>to_string</span>(), <span class='ident'>expect</span>);
    <span class='macro'>assert_eq</span><span class='macro'>!</span>(
        <span class='macro'>format</span><span class='macro'>!</span>(<span class='string'>&quot;{:?}&quot;</span>, <span class='ident'>errno</span>()),
        <span class='macro'>format</span><span class='macro'>!</span>(<span class='string'>&quot;Errno {{ code: 1, description: Some({:?}) }}&quot;</span>, <span class='ident'>expect</span>));
}
</pre>
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