[#subprocess-Popen-send-03]
= xref:subprocess.adoc[subprocess]::xref:subprocess/Popen.adoc[Popen]::send
:relfileprefix: ../../
:mrdocs:

Sends the contents of a byte vector to the child's input channel.

== Synopsis

Declared in `<util/subprocess.h>`

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

== Return Value

Number of bytes written, or ‐1 on error.

== Parameters

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


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