sysctl 0.1.1

Simplified Rust interface to libc::sysctl
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</pre><pre class='rust '>
<span class='doccomment'>/// A macro for defining #[cfg] if-else statements.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This is similar to the `if/elif` C preprocessor macro by allowing definition</span>
<span class='doccomment'>/// of a cascade of `#[cfg]` cases, emitting the implementation which matches</span>
<span class='doccomment'>/// first.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This allows you to conveniently provide a long list #[cfg]&#39;d blocks of code</span>
<span class='doccomment'>/// without having to rewrite each clause multiple times.</span>
<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>cfg_if</span> {
    ($(
        <span class='kw'>if</span> <span class='attribute'>#[<span class='ident'>cfg</span>($(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>meta</span>:<span class='ident'>meta</span>),<span class='kw-2'>*</span>)]</span> { $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>it</span>:<span class='ident'>item</span>)<span class='op'>*</span> }
    ) <span class='kw'>else</span> <span class='op'>*</span> <span class='kw'>else</span> {
        $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>it2</span>:<span class='ident'>item</span>)<span class='op'>*</span>
    }) <span class='op'>=&gt;</span> {
        <span class='macro'>__cfg_if_items</span><span class='macro'>!</span> {
            () ;
            $( ( ($(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>meta</span>),<span class='kw-2'>*</span>) ($(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>it</span>)<span class='kw-2'>*</span>) ), )<span class='op'>*</span>
            ( () ($(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>it2</span>)<span class='kw-2'>*</span>) ),
        }
    }
}

<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>__cfg_if_items</span> {
    (($(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>not</span>:<span class='ident'>meta</span>,)<span class='kw-2'>*</span>) ; ) <span class='op'>=&gt;</span> {};
    (($(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>not</span>:<span class='ident'>meta</span>,)<span class='kw-2'>*</span>) ; ( ($(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>m</span>:<span class='ident'>meta</span>),<span class='kw-2'>*</span>) ($(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>it</span>:<span class='ident'>item</span>)<span class='kw-2'>*</span>) ), $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>rest</span>:<span class='ident'>tt</span>)<span class='kw-2'>*</span>) <span class='op'>=&gt;</span> {
        <span class='macro'>__cfg_if_apply</span><span class='macro'>!</span> { <span class='ident'>cfg</span>(<span class='ident'>all</span>(<span class='ident'>not</span>(<span class='ident'>any</span>($(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>not</span>),<span class='kw-2'>*</span>)), $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>m</span>,)<span class='kw-2'>*</span>)), $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>it</span>)<span class='op'>*</span> }
        <span class='macro'>__cfg_if_items</span><span class='macro'>!</span> { ($(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>not</span>,)<span class='op'>*</span> $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>m</span>,)<span class='kw-2'>*</span>) ; $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>rest</span>)<span class='op'>*</span> }
    }
}

<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>__cfg_if_apply</span> {
    (<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>m</span>:<span class='ident'>meta</span>, $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>it</span>:<span class='ident'>item</span>)<span class='kw-2'>*</span>) <span class='op'>=&gt;</span> {
        $(<span class='attribute'>#[<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>m</span>]</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>it</span>)<span class='op'>*</span>
    }
}

<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>s</span> {
    ($($(<span class='attribute'>#[<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>attr</span>:<span class='ident'>meta</span>]</span>)<span class='op'>*</span> <span class='kw'>pub</span> <span class='kw'>struct</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>i</span>:<span class='ident'>ident</span> { $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>field</span>:<span class='ident'>tt</span>)<span class='op'>*</span> })<span class='kw-2'>*</span>) <span class='op'>=&gt;</span> ($(
        <span class='macro'>__item</span><span class='macro'>!</span> {
            <span class='attribute'>#[<span class='ident'>repr</span>(<span class='ident'>C</span>)]</span>
            $(<span class='attribute'>#[<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>attr</span>]</span>)<span class='op'>*</span>
            <span class='kw'>pub</span> <span class='kw'>struct</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>i</span> { $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>field</span>)<span class='op'>*</span> }
        }
        <span class='kw'>impl</span> ::<span class='ident'>dox</span>::<span class='ident'>Copy</span> <span class='kw'>for</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>i</span> {}
        <span class='kw'>impl</span> ::<span class='ident'>dox</span>::<span class='ident'>Clone</span> <span class='kw'>for</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>i</span> {
            <span class='kw'>fn</span> <span class='ident'>clone</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>i</span> { <span class='kw-2'>*</span><span class='self'>self</span> }
        }
    )<span class='kw-2'>*</span>)
}

<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>f</span> {
    ($(<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>i</span>:<span class='ident'>ident</span>($(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>:<span class='ident'>ident</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>argty</span>:<span class='ident'>ty</span>),<span class='kw-2'>*</span>) <span class='op'>-&gt;</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ret</span>:<span class='ident'>ty</span> {
        $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>body</span>:<span class='ident'>stmt</span>);<span class='op'>*</span>
    })<span class='kw-2'>*</span>) <span class='op'>=&gt;</span> ($(
        <span class='attribute'>#[<span class='ident'>inline</span>]</span>
        <span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>not</span>(<span class='ident'>dox</span>))]</span>
        <span class='kw'>pub</span> <span class='kw'>unsafe</span> <span class='kw'>extern</span> <span class='kw'>fn</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>i</span>($(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>argty</span>),<span class='kw-2'>*</span>) <span class='op'>-&gt;</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ret</span> {
            $(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>body</span>);<span class='op'>*</span>
        }

        <span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>dox</span>)]</span>
        <span class='attribute'>#[<span class='ident'>allow</span>(<span class='ident'>dead_code</span>)]</span>
        <span class='kw'>pub</span> <span class='kw'>unsafe</span> <span class='kw'>extern</span> <span class='kw'>fn</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>i</span>($(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>arg</span>: <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>argty</span>),<span class='kw-2'>*</span>) <span class='op'>-&gt;</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ret</span> {
            <span class='kw'>loop</span> {}
        }
    )<span class='kw-2'>*</span>)
}

<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>__item</span> {
    (<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>i</span>:<span class='ident'>item</span>) <span class='op'>=&gt;</span> (<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>i</span>)
}

<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
<span class='kw'>mod</span> <span class='ident'>tests</span> {
    <span class='macro'>cfg_if</span><span class='macro'>!</span> {
        <span class='kw'>if</span> <span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span> {
            <span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>option</span>::<span class='prelude-ty'>Option</span> <span class='kw'>as</span> <span class='ident'>Option2</span>;
            <span class='kw'>fn</span> <span class='ident'>works1</span>() <span class='op'>-&gt;</span> <span class='ident'>Option2</span><span class='op'>&lt;</span><span class='ident'>u32</span><span class='op'>&gt;</span> { <span class='prelude-val'>Some</span>(<span class='number'>1</span>) }
        } <span class='kw'>else</span> {
            <span class='kw'>fn</span> <span class='ident'>works1</span>() <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>u32</span><span class='op'>&gt;</span> { <span class='prelude-val'>None</span> }
        }
    }

    <span class='macro'>cfg_if</span><span class='macro'>!</span> {
        <span class='kw'>if</span> <span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>foo</span>)]</span> {
            <span class='kw'>fn</span> <span class='ident'>works2</span>() <span class='op'>-&gt;</span> <span class='ident'>bool</span> { <span class='bool-val'>false</span> }
        } <span class='kw'>else</span> <span class='kw'>if</span> <span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span> {
            <span class='kw'>fn</span> <span class='ident'>works2</span>() <span class='op'>-&gt;</span> <span class='ident'>bool</span> { <span class='bool-val'>true</span> }
        } <span class='kw'>else</span> {
            <span class='kw'>fn</span> <span class='ident'>works2</span>() <span class='op'>-&gt;</span> <span class='ident'>bool</span> { <span class='bool-val'>false</span> }
        }
    }

    <span class='macro'>cfg_if</span><span class='macro'>!</span> {
        <span class='kw'>if</span> <span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>foo</span>)]</span> {
            <span class='kw'>fn</span> <span class='ident'>works3</span>() <span class='op'>-&gt;</span> <span class='ident'>bool</span> { <span class='bool-val'>false</span> }
        } <span class='kw'>else</span> {
            <span class='kw'>fn</span> <span class='ident'>works3</span>() <span class='op'>-&gt;</span> <span class='ident'>bool</span> { <span class='bool-val'>true</span> }
        }
    }

    <span class='attribute'>#[<span class='ident'>test</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>it_works</span>() {
        <span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>works1</span>().<span class='ident'>is_some</span>());
        <span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>works2</span>());
        <span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>works3</span>());
    }
}
</pre>
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