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

class: Popen This is the single most important class in the whole library and glues together all the helper classes to provide a common interface to the client.

== Synopsis

Declared in `<util/subprocess.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
class Popen;
----

== Description

API's provided by the class: Popen({"cmd"}, output{..}, error{..}, ....) Command provided as a sequence. wait() ‐ Wait for the child to exit. retcode() ‐ The return code of the exited child. send(...) ‐ Send input to the input channel of the child. communicate(...) ‐ Get the output/error from the child and close the channels from the parent side.

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:subprocess/Popen/2constructor-07.adoc[`Popen`]         [.small]#[constructor]#
| Constructors
| xref:subprocess/Popen/communicate-00.adoc[`communicate`] 
| `communicate` overloads
| xref:subprocess/Popen/retcode.adoc[`retcode`] 
| Returns the return code of the child process, valid after it has exited.
| xref:subprocess/Popen/send-06.adoc[`send`] 
| `send` overloads
| xref:subprocess/Popen/set_err_buf_cap.adoc[`set_err_buf_cap`] 
| Sets the capacity of the buffer used to capture the child's error output.
| xref:subprocess/Popen/set_out_buf_cap.adoc[`set_out_buf_cap`] 
| Sets the capacity of the buffer used to capture the child's output.
| xref:subprocess/Popen/wait.adoc[`wait`] 
| Waits for the child process to exit and returns its status.
|===



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