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<h1 class='fqn'><span class='in-band'>Module <a href='../index.html'>std</a>::<wbr><a class="mod" href=''>process</a></span><span class='out-of-band'><span class='since' title='Stable since Rust version 1.0.0'>1.0.0</span><span id='render-detail'>
<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
[<span class='inner'>−</span>]
</a>
</span><a class='srclink' href='../../src/std/process.rs.html#11-1852' title='goto source code'>[src]</a></span></h1>
<div class='docblock'><p>A module for working with processes.</p>
<p>This module is mostly concerned with spawning and interacting with child
processes, but it also provides <a href="fn.abort.html"><code>abort</code></a> and <a href="fn.exit.html"><code>exit</code></a> for terminating the
current process.</p>
<h1 id="spawning-a-process" class="section-header"><a href="#spawning-a-process">Spawning a process</a></h1>
<p>The <a href="struct.Command.html"><code>Command</code></a> struct is used to configure and spawn processes:</p>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">process</span>::<span class="ident">Command</span>;
<span class="kw">let</span> <span class="ident">output</span> <span class="op">=</span> <span class="ident">Command</span>::<span class="ident">new</span>(<span class="string">"echo"</span>)
.<span class="ident">arg</span>(<span class="string">"Hello world"</span>)
.<span class="ident">output</span>()
.<span class="ident">expect</span>(<span class="string">"Failed to execute command"</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">b"Hello world\n"</span>, <span class="ident">output</span>.<span class="ident">stdout</span>.<span class="ident">as_slice</span>());<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Aprocess%3A%3ACommand%3B%0A%0Alet%20output%20%3D%20Command%3A%3Anew(%22echo%22)%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20.arg(%22Hello%20world%22)%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20.output()%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20.expect(%22Failed%20to%20execute%20command%22)%3B%0A%0Aassert_eq!(b%22Hello%20world%5Cn%22%2C%20output.stdout.as_slice())%3B%0A%7D">Run</a></pre>
<p>Several methods on <a href="struct.Command.html"><code>Command</code></a>, such as <a href="struct.Command.html#method.spawn"><code>spawn</code></a> or <a href="struct.Command.html#method.output"><code>output</code></a>, can be used
to spawn a process. In particular, <a href="struct.Command.html#method.output"><code>output</code></a> spawns the child process and
waits until the process terminates, while <a href="struct.Command.html#method.spawn"><code>spawn</code></a> will return a <a href="struct.Child.html"><code>Child</code></a>
that represents the spawned child process.</p>
<h1 id="handling-io" class="section-header"><a href="#handling-io">Handling I/O</a></h1>
<p>The <a href="struct.Command.html#method.stdout"><code>stdout</code></a>, <a href="struct.Command.html#method.stdin"><code>stdin</code></a>, and <a href="struct.Command.html#method.stderr"><code>stderr</code></a> of a child process can be
configured by passing an <a href="struct.Stdio.html"><code>Stdio</code></a> to the corresponding method on
<a href="struct.Command.html"><code>Command</code></a>. Once spawned, they can be accessed from the <a href="struct.Child.html"><code>Child</code></a>. For
example, piping output from one command into another command can be done
like so:</p>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">process</span>::{<span class="ident">Command</span>, <span class="ident">Stdio</span>};
<span class="comment">// stdout must be configured with `Stdio::piped` in order to use</span>
<span class="comment">// `echo_child.stdout`</span>
<span class="kw">let</span> <span class="ident">echo_child</span> <span class="op">=</span> <span class="ident">Command</span>::<span class="ident">new</span>(<span class="string">"echo"</span>)
.<span class="ident">arg</span>(<span class="string">"Oh no, a tpyo!"</span>)
.<span class="ident">stdout</span>(<span class="ident">Stdio</span>::<span class="ident">piped</span>())
.<span class="ident">spawn</span>()
.<span class="ident">expect</span>(<span class="string">"Failed to start echo process"</span>);
<span class="comment">// Note that `echo_child` is moved here, but we won't be needing</span>
<span class="comment">// `echo_child` anymore</span>
<span class="kw">let</span> <span class="ident">echo_out</span> <span class="op">=</span> <span class="ident">echo_child</span>.<span class="ident">stdout</span>.<span class="ident">expect</span>(<span class="string">"Failed to open echo stdout"</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">sed_child</span> <span class="op">=</span> <span class="ident">Command</span>::<span class="ident">new</span>(<span class="string">"sed"</span>)
.<span class="ident">arg</span>(<span class="string">"s/tpyo/typo/"</span>)
.<span class="ident">stdin</span>(<span class="ident">Stdio</span>::<span class="ident">from</span>(<span class="ident">echo_out</span>))
.<span class="ident">stdout</span>(<span class="ident">Stdio</span>::<span class="ident">piped</span>())
.<span class="ident">spawn</span>()
.<span class="ident">expect</span>(<span class="string">"Failed to start sed process"</span>);
<span class="kw">let</span> <span class="ident">output</span> <span class="op">=</span> <span class="ident">sed_child</span>.<span class="ident">wait_with_output</span>().<span class="ident">expect</span>(<span class="string">"Failed to wait on sed"</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">b"Oh no, a typo!\n"</span>, <span class="ident">output</span>.<span class="ident">stdout</span>.<span class="ident">as_slice</span>());<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Aprocess%3A%3A%7BCommand%2C%20Stdio%7D%3B%0A%0A%2F%2F%20stdout%20must%20be%20configured%20with%20%60Stdio%3A%3Apiped%60%20in%20order%20to%20use%0A%2F%2F%20%60echo_child.stdout%60%0Alet%20echo_child%20%3D%20Command%3A%3Anew(%22echo%22)%0A%20%20%20%20.arg(%22Oh%20no%2C%20a%20tpyo!%22)%0A%20%20%20%20.stdout(Stdio%3A%3Apiped())%0A%20%20%20%20.spawn()%0A%20%20%20%20.expect(%22Failed%20to%20start%20echo%20process%22)%3B%0A%0A%2F%2F%20Note%20that%20%60echo_child%60%20is%20moved%20here%2C%20but%20we%20won't%20be%20needing%0A%2F%2F%20%60echo_child%60%20anymore%0Alet%20echo_out%20%3D%20echo_child.stdout.expect(%22Failed%20to%20open%20echo%20stdout%22)%3B%0A%0Alet%20mut%20sed_child%20%3D%20Command%3A%3Anew(%22sed%22)%0A%20%20%20%20.arg(%22s%2Ftpyo%2Ftypo%2F%22)%0A%20%20%20%20.stdin(Stdio%3A%3Afrom(echo_out))%0A%20%20%20%20.stdout(Stdio%3A%3Apiped())%0A%20%20%20%20.spawn()%0A%20%20%20%20.expect(%22Failed%20to%20start%20sed%20process%22)%3B%0A%0Alet%20output%20%3D%20sed_child.wait_with_output().expect(%22Failed%20to%20wait%20on%20sed%22)%3B%0Aassert_eq!(b%22Oh%20no%2C%20a%20typo!%5Cn%22%2C%20output.stdout.as_slice())%3B%0A%7D">Run</a></pre>
<p>Note that <a href="struct.ChildStderr.html"><code>ChildStderr</code></a> and <a href="struct.ChildStdout.html"><code>ChildStdout</code></a> implement <a href="../io/trait.Read.html"><code>Read</code></a> and
<a href="struct.ChildStdin.html"><code>ChildStdin</code></a> implements <a href="../io/trait.Write.html"><code>Write</code></a>:</p>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">process</span>::{<span class="ident">Command</span>, <span class="ident">Stdio</span>};
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">io</span>::<span class="ident">Write</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">child</span> <span class="op">=</span> <span class="ident">Command</span>::<span class="ident">new</span>(<span class="string">"/bin/cat"</span>)
.<span class="ident">stdin</span>(<span class="ident">Stdio</span>::<span class="ident">piped</span>())
.<span class="ident">stdout</span>(<span class="ident">Stdio</span>::<span class="ident">piped</span>())
.<span class="ident">spawn</span>()
.<span class="ident">expect</span>(<span class="string">"failed to execute child"</span>);
{
<span class="comment">// limited borrow of stdin</span>
<span class="kw">let</span> <span class="ident">stdin</span> <span class="op">=</span> <span class="ident">child</span>.<span class="ident">stdin</span>.<span class="ident">as_mut</span>().<span class="ident">expect</span>(<span class="string">"failed to get stdin"</span>);
<span class="ident">stdin</span>.<span class="ident">write_all</span>(<span class="string">b"test"</span>).<span class="ident">expect</span>(<span class="string">"failed to write to stdin"</span>);
}
<span class="kw">let</span> <span class="ident">output</span> <span class="op">=</span> <span class="ident">child</span>
.<span class="ident">wait_with_output</span>()
.<span class="ident">expect</span>(<span class="string">"failed to wait on child"</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">b"test"</span>, <span class="ident">output</span>.<span class="ident">stdout</span>.<span class="ident">as_slice</span>());<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Aprocess%3A%3A%7BCommand%2C%20Stdio%7D%3B%0Ause%20std%3A%3Aio%3A%3AWrite%3B%0A%0Alet%20mut%20child%20%3D%20Command%3A%3Anew(%22%2Fbin%2Fcat%22)%0A%20%20%20%20.stdin(Stdio%3A%3Apiped())%0A%20%20%20%20.stdout(Stdio%3A%3Apiped())%0A%20%20%20%20.spawn()%0A%20%20%20%20.expect(%22failed%20to%20execute%20child%22)%3B%0A%0A%7B%0A%20%20%20%20%2F%2F%20limited%20borrow%20of%20stdin%0A%20%20%20%20let%20stdin%20%3D%20child.stdin.as_mut().expect(%22failed%20to%20get%20stdin%22)%3B%0A%20%20%20%20stdin.write_all(b%22test%22).expect(%22failed%20to%20write%20to%20stdin%22)%3B%0A%7D%0A%0Alet%20output%20%3D%20child%0A%20%20%20%20.wait_with_output()%0A%20%20%20%20.expect(%22failed%20to%20wait%20on%20child%22)%3B%0A%0Aassert_eq!(b%22test%22%2C%20output.stdout.as_slice())%3B%0A%7D">Run</a></pre>
</div><h2 id='structs' class='section-header'><a href="#structs">Structs</a></h2>
<table>
<tr class=' module-item'>
<td><a class="struct" href="struct.Child.html"
title='struct std::process::Child'>Child</a></td>
<td class='docblock-short'>
<p>Representation of a running or exited child process.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.ChildStderr.html"
title='struct std::process::ChildStderr'>ChildStderr</a></td>
<td class='docblock-short'>
<p>A handle to a child process's stderr.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.ChildStdin.html"
title='struct std::process::ChildStdin'>ChildStdin</a></td>
<td class='docblock-short'>
<p>A handle to a child process's standard input (stdin).</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.ChildStdout.html"
title='struct std::process::ChildStdout'>ChildStdout</a></td>
<td class='docblock-short'>
<p>A handle to a child process's standard output (stdout).</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Command.html"
title='struct std::process::Command'>Command</a></td>
<td class='docblock-short'>
<p>A process builder, providing fine-grained control
over how a new process should be spawned.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.ExitStatus.html"
title='struct std::process::ExitStatus'>ExitStatus</a></td>
<td class='docblock-short'>
<p>Describes the result of a process after it has terminated.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Output.html"
title='struct std::process::Output'>Output</a></td>
<td class='docblock-short'>
<p>The output of a finished process.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="struct" href="struct.Stdio.html"
title='struct std::process::Stdio'>Stdio</a></td>
<td class='docblock-short'>
<p>Describes what to do with a standard I/O stream for a child process when
passed to the <a href="struct.Command.html#method.stdin"><code>stdin</code></a>, <a href="struct.Command.html#method.stdout"><code>stdout</code></a>, and <a href="struct.Command.html#method.stderr"><code>stderr</code></a> methods of <a href="struct.Command.html"><code>Command</code></a>.</p>
</td>
</tr></table><h2 id='functions' class='section-header'><a href="#functions">Functions</a></h2>
<table>
<tr class=' module-item'>
<td><a class="fn" href="fn.abort.html"
title='fn std::process::abort'>abort</a></td>
<td class='docblock-short'>
<p>Terminates the process in an abnormal fashion.</p>
</td>
</tr>
<tr class=' module-item'>
<td><a class="fn" href="fn.exit.html"
title='fn std::process::exit'>exit</a></td>
<td class='docblock-short'>
<p>Terminates the current process with the specified exit code.</p>
</td>
</tr>
<tr class='unstable module-item'>
<td><a class="fn" href="fn.id.html"
title='fn std::process::id'>id</a></td>
<td class='docblock-short'>
[<div class='stab unstable'>Experimental</div>] <p>Returns the OS-assigned process identifier associated with this process.</p>
</td>
</tr></table></section>
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