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| <h1 class='fqn'><span class='in-band'>Function <a href='../index.html'>nix</a>::<wbr><a href='index.html'>unistd</a>::<wbr><a class="fn" href=''>fork</a></span><span class='out-of-band'><span id='render-detail'> |
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| </span><a class='srclink' href='../../src/nix/unistd.rs.html#75-83' title='goto source code'>[src]</a></span></h1> |
| <pre class='rust fn'>pub fn fork() -> <a class="type" href="../../nix/type.Result.html" title="type nix::Result">Result</a><<a class="enum" href="../../nix/unistd/enum.ForkResult.html" title="enum nix::unistd::ForkResult">ForkResult</a>></pre><div class='docblock'><p>Create a new child process duplicating the parent process (<a href="http://man7.org/linux/man-pages/man2/fork.2.html">see |
| fork(2)</a>).</p> |
| |
| <p>After calling the fork system call (successfully) two processes will |
| be created that are identical with the exception of their pid and the |
| return value of this function. As an example:</p> |
| |
| <pre class="rust rust-example-rendered"> |
| <span class="kw">use</span> <span class="ident">nix</span>::<span class="ident">unistd</span>::{<span class="ident">fork</span>, <span class="ident">ForkResult</span>}; |
| |
| <span class="kw">match</span> <span class="ident">fork</span>() { |
| <span class="prelude-val">Ok</span>(<span class="ident">ForkResult</span>::<span class="ident">Parent</span> { <span class="ident">child</span>, .. }) <span class="op">=></span> { |
| <span class="macro">println</span><span class="macro">!</span>(<span class="string">"Continuing execution in parent process, new child has pid: {}"</span>, <span class="ident">child</span>); |
| } |
| <span class="prelude-val">Ok</span>(<span class="ident">ForkResult</span>::<span class="ident">Child</span>) <span class="op">=></span> <span class="macro">println</span><span class="macro">!</span>(<span class="string">"I'm a new child process"</span>), |
| <span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=></span> <span class="macro">println</span><span class="macro">!</span>(<span class="string">"Fork failed"</span>), |
| }</pre> |
| |
| <p>This will print something like the following (order indeterministic). The |
| thing to note is that you end up with two processes continuing execution |
| immediately after the fork call but with different match arms.</p> |
| |
| <pre><code class="language-text">Continuing execution in parent process, new child has pid: 1234 |
| I'm a new child process |
| </code></pre> |
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