[#subprocess-Popen-communicate-066]
= xref:subprocess.adoc[subprocess]::xref:subprocess/Popen.adoc[Popen]::communicate
:relfileprefix: ../../
:mrdocs:

Sends a byte vector to the child, then reads its output and error until it exits.

== Synopsis

Declared in `<util/subprocess.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::pair<OutBuffer, ErrBuffer>
communicate(std::vector<char> const& msg);
----

== Return Value

The captured output and error buffers.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *msg*
| Bytes to send first.
|===


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