= nng_close(3)
:copyright: Copyright 2018 mailto:info@staysail.tech[Staysail Systems, Inc.] + \
            Copyright 2018 mailto:info@capitar.com[Capitar IT Group BV] + \
            {blank} + \
            This document is supplied under the terms of the \
            https://opensource.org/licenses/MIT[MIT License].

== NAME

nng_close - close socket

== SYNOPSIS

[source, c]
-----------
#include <nng/nng.h>

int nng_close(nng_socket s);
-----------

== DESCRIPTION

The `nng_close()` function closes the supplied socket, _s_.  Messages
that have been submitted for sending may be flushed or delivered,
depending upon the transport and the setting of the `NNG_OPT_LINGER`
option.

Further attempts to use the socket after this call returns will result
in `NNG_EBADF`.  Threads waiting for operations on the socket when this
call is executed may also return with an `NNG_EBADF` result.

== RETURN VALUES

This function returns 0 on success, and non-zero otherwise.

== ERRORS

`NNG_EBADF`:: The socket _s_ is already closed or was never opened.

== SEE ALSO

<<nng_setopt#,nng_setopt(3)>>,
<<nng_strerror#,nng_strerror(3)>>,
<<nng#,nng(7)>>

== COPYRIGHT

{copyright}
