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<span class="comment">// Copyright 2016 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 &lt;LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license</span>
<span class="comment">// &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, 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="doccomment">//! Platform-dependent platform abstraction</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The `std::sys` module is the abstracted interface through which</span>
<span class="doccomment">//! `std` talks to the underlying operating system. It has different</span>
<span class="doccomment">//! implementations for different operating system families, today</span>
<span class="doccomment">//! just Unix and Windows, and initial support for Redox.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The centralization of platform-specific code in this module is</span>
<span class="doccomment">//! enforced by the &quot;platform abstraction layer&quot; tidy script in</span>
<span class="doccomment">//! `tools/tidy/src/pal.rs`.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! This module is closely related to the platform-independent system</span>
<span class="doccomment">//! integration code in `std::sys_common`. See that module&#39;s</span>
<span class="doccomment">//! documentation for details.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! In the future it would be desirable for the independent</span>
<span class="doccomment">//! implementations of this module to be extracted to their own crates</span>
<span class="doccomment">//! that `std` can link to, thus enabling their implementation</span>
<span class="doccomment">//! out-of-tree via crate replacement. Though due to the complex</span>
<span class="doccomment">//! inter-dependencies within `std` that will be a challenging goal to</span>
<span class="doccomment">//! achieve.</span>

<span class="attribute">#![<span class="ident">allow</span>(<span class="ident">missing_debug_implementations</span>)]</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">unix</span>)]</span> {
        <span class="kw">mod</span> <span class="ident">unix</span>;
        <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">unix</span>::<span class="kw-2">*</span>;
    } <span class="kw">else</span> <span class="kw">if</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="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">windows</span>::<span class="kw-2">*</span>;
    } <span class="kw">else</span> <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;cloudabi&quot;</span>)]</span> {
        <span class="kw">mod</span> <span class="ident">cloudabi</span>;
        <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">cloudabi</span>::<span class="kw-2">*</span>;
    } <span class="kw">else</span> <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;redox&quot;</span>)]</span> {
        <span class="kw">mod</span> <span class="ident">redox</span>;
        <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">redox</span>::<span class="kw-2">*</span>;
    } <span class="kw">else</span> <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;wasm32&quot;</span>)]</span> {
        <span class="kw">mod</span> <span class="ident">wasm</span>;
        <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">wasm</span>::<span class="kw-2">*</span>;
    } <span class="kw">else</span> {
        <span class="macro">compile_error</span><span class="macro">!</span>(<span class="string">&quot;libstd doesn&#39;t compile for this platform yet&quot;</span>);
    }
}

<span class="comment">// Import essential modules from both platforms when documenting. These are</span>
<span class="comment">// then later used in the `std::os` module when documenting, for example,</span>
<span class="comment">// Windows when we&#39;re compiling for Linux.</span>

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">dox</span>)]</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">any</span>(<span class="ident">unix</span>, <span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;redox&quot;</span>))]</span> {
        <span class="comment">// On unix we&#39;ll document what&#39;s already available</span>
        <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">ext</span> <span class="kw">as</span> <span class="ident">unix_ext</span>;
    } <span class="kw">else</span> <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;cloudabi&quot;</span>, <span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;wasm32&quot;</span>))]</span> {
        <span class="comment">// On CloudABI and wasm right now the module below doesn&#39;t compile</span>
        <span class="comment">// (missing things in `libc` which is empty) so just omit everything</span>
        <span class="comment">// with an empty module</span>
        <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">issue</span> <span class="op">=</span> <span class="string">&quot;0&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std_internals&quot;</span>)]</span>
        <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">unix_ext</span> {}
    } <span class="kw">else</span> {
        <span class="comment">// On other platforms like Windows document the bare bones of unix</span>
        <span class="kw">use</span> <span class="ident">os</span>::<span class="ident">linux</span> <span class="kw">as</span> <span class="ident">platform</span>;
        <span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">&quot;unix/ext/mod.rs&quot;</span>]</span>
        <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">unix_ext</span>;
    }
}

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">dox</span>)]</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">windows</span>)]</span> {
        <span class="comment">// On windows we&#39;ll just be documenting what&#39;s already available</span>
        <span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">ext</span> <span class="kw">as</span> <span class="ident">windows_ext</span>;
    } <span class="kw">else</span> <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">any</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">&quot;cloudabi&quot;</span>, <span class="ident">target_arch</span> <span class="op">=</span> <span class="string">&quot;wasm32&quot;</span>))]</span> {
        <span class="comment">// On CloudABI and wasm right now the shim below doesn&#39;t compile, so</span>
        <span class="comment">// just omit it</span>
        <span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">issue</span> <span class="op">=</span> <span class="string">&quot;0&quot;</span>, <span class="ident">feature</span> <span class="op">=</span> <span class="string">&quot;std_internals&quot;</span>)]</span>
        <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">windows_ext</span> {}
    } <span class="kw">else</span> {
        <span class="comment">// On all other platforms (aka linux/osx/etc) then pull in a &quot;minimal&quot;</span>
        <span class="comment">// amount of windows goop which ends up compiling</span>
        <span class="attribute">#[<span class="ident">macro_use</span>]</span>
        <span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">&quot;windows/compat.rs&quot;</span>]</span>
        <span class="kw">mod</span> <span class="ident">compat</span>;

        <span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">&quot;windows/c.rs&quot;</span>]</span>
        <span class="kw">mod</span> <span class="ident">c</span>;

        <span class="attribute">#[<span class="ident">path</span> <span class="op">=</span> <span class="string">&quot;windows/ext/mod.rs&quot;</span>]</span>
        <span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">windows_ext</span>;
    }
}
</pre>
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