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libzmq/doc/zmq_msg_close.adoc
Francesco Montorsi b6ca9b2983 Feature: modernize API documentation
* migrate from the old, unmaintained "asciidoc-py" tool to the new "asciidoctor" generator
* migrate from asciidoc-py syntax to the modern Asciidoc syntax (especially page titles and section titles)
* remove the need of "xmlto" utility to create the manpage output; use asciidoctor for that
* add HTML output support to the doc/Makefile by using asciidoctor
* change API documentation files extension from .txt to .adoc to make it more explicit that they are Asciidoc-encoded (as a bonus several IDE plugins will autodetect the .adoc format as Asciidoc)
* remove asciidoc.conf: asciidoctor does not support that; this also required replacing the macro linkzmq into all documentation pages
* add a new Github action CI do deploy to Github Pages the static HTMLs produced by Asciidoctors
* removed references to the "xmlto" and "a2x" tools from the build and packaging systems: Asciidoctor can convert the documentation directly to e.g. pdf (via extended converters) and anyway there was no code/target for using "xmlto" and "a2x" tools anyway
2023-10-25 23:59:38 +02:00

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= zmq_msg_close(3)
== NAME
zmq_msg_close - release 0MQ message
== SYNOPSIS
*int zmq_msg_close (zmq_msg_t '*msg');*
== DESCRIPTION
The _zmq_msg_close()_ function shall inform the 0MQ infrastructure that any
resources associated with the message object referenced by 'msg' are no longer
required and may be released. Actual release of resources associated with the
message object shall be postponed by 0MQ until all users of the message or
underlying data buffer have indicated it is no longer required.
Applications should ensure that _zmq_msg_close()_ is called once a message is
no longer required, otherwise memory leaks may occur. Note that this is NOT
necessary after a successful _zmq_msg_send()_.
CAUTION: Never access 'zmq_msg_t' members directly, instead always use the
_zmq_msg_ family of functions.
== RETURN VALUE
The _zmq_msg_close()_ function shall return zero if successful. Otherwise
it shall return `-1` and set 'errno' to one of the values defined below.
== ERRORS
*EFAULT*::
Invalid message.
== SEE ALSO
xref:zmq_msg_init.adoc[zmq_msg_init]
xref:zmq_msg_init_size.adoc[zmq_msg_init_size]
xref:zmq_msg_init_buffer.adoc[zmq_msg_init_buffer]
xref:zmq_msg_init_data.adoc[zmq_msg_init_data]
xref:zmq_msg_data.adoc[zmq_msg_data]
xref:zmq_msg_size.adoc[zmq_msg_size]
xref:zmq.adoc[zmq]
== AUTHORS
This page was written by the 0MQ community. To make a change please
read the 0MQ Contribution Policy at <http://www.zeromq.org/docs:contributing>.