zmq_msg_close - release 0MQ message
int zmq_msg_close (zmq_msg_t *msg);
function shall inform the 0MQ infrastructure that any
resources associated with the message object referenced by msg
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()
Never access zmq_msg_t
members directly, instead always use the
family of functions.
function shall return zero if successful. Otherwise
it shall return -1 and set errno
to one of the values defined below.
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