zmq_msg_init - Man Page

initialise empty 0MQ message


int zmq_msg_init (zmq_msg_t *msg);


The zmq_msg_init() function shall initialise the message object referenced by msg to represent an empty message. This function is most useful when called before receiving a message with zmq_msg_recv().


Never access zmq_msg_t members directly, instead always use the zmq_msg family of functions.


The functions zmq_msg_init(), zmq_msg_init_data(), zmq_msg_init_size() and zmq_msg_init_buffer() are mutually exclusive. Never initialise the same zmq_msg_t twice.

Return Value

The zmq_msg_init() function always returns zero.


No errors are defined.


Receiving a message from a socket.

zmq_msg_t msg;
rc = zmq_msg_init (&msg);
assert (rc == 0);
int nbytes = zmq_msg_recv (socket, &msg, 0);
assert (nbytes != -1);

See Also

zmq_msg_init_size(3) zmq_msg_init_buffer(3) zmq_msg_init_data(3) zmq_msg_close(3) zmq_msg_data(3) zmq_msg_size(3) zmq(7)


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Referenced By

zmq(7), zmq_msg_close(3), zmq_msg_copy(3), zmq_msg_data(3), zmq_msg_get(3), zmq_msg_init_buffer(3), zmq_msg_init_data(3), zmq_msg_init_size(3), zmq_msg_more(3), zmq_msg_move(3), zmq_msg_size(3).

08/13/2020 0MQ 4.3.3 0MQ Manual