[#Sock-Listen]
= xref:Sock.adoc[Sock]::Listen
:relfileprefix: ../
:mrdocs:

listen(2) wrapper. Equivalent to `listen(m_socket, backlog)`. Code that uses this wrapper can be unit tested if this method is overridden by a mock Sock implementation.

== Synopsis

Declared in `<util/sock.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[nodiscard]]
virtual
int
Listen(int backlog) const;
----

== Return Value

0 on success, or ‐1 on error (with errno set).

[NOTE]
====
The return value https://en.cppreference.com/cpp/language/attributes/nodiscard[should not be discarded^].
====
== Parameters

[cols="1,4"]
|===
| Name| Description
| *backlog*
| Maximum length of the queue of pending connections.
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#