[#subprocess-Popen-set_err_buf_cap]
= xref:subprocess.adoc[subprocess]::xref:subprocess/Popen.adoc[Popen]::set&lowbar;err&lowbar;buf&lowbar;cap
:relfileprefix: ../../
:mrdocs:

Sets the capacity of the buffer used to capture the child&apos;s error output&period;

== Synopsis

Declared in `&lt;util&sol;subprocess&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
set&lowbar;err&lowbar;buf&lowbar;cap(size&lowbar;t cap);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *cap*
| New error buffer capacity, in bytes&period;
|===


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