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ZMQ_MSG_SEND(3) | 0MQ Manual | ZMQ_MSG_SEND(3) |
NAME¶
zmq_msg_send - send a message part on a socketSYNOPSIS¶
int zmq_msg_send (zmq_msg_t *msg, void *socket , int flags);DESCRIPTION¶
The zmq_msg_send() function is identical to zmq_sendmsg(3), which shall be deprecated in future versions. zmq_msg_send() is more consistent with other message manipulation functions.Specifies that the operation should be
performed in non-blocking mode. If the message cannot be queued on the
socket, the zmq_msg_send() function shall fail with errno
set to EAGAIN.
ZMQ_SNDMORE
Specifies that the message being sent is a
multi-part message, and that further message parts are to follow. Refer to the
section regarding multi-part messages below for a detailed description.
Multi-part messages¶
A 0MQ message is composed of 1 or more message parts. Each message part is an independent zmq_msg_t in its own right. 0MQ ensures atomic delivery of messages: peers shall receive either all message parts of a message or none at all. The total number of message parts is unlimited except by available memory.RETURN VALUE¶
The zmq_msg_send() function shall return number of bytes in the message if successful. Otherwise it shall return -1 and set errno to one of the values defined below.ERRORS¶
EAGAINNon-blocking mode was requested and the
message cannot be sent at the moment.
ENOTSUP
The zmq_msg_send() operation is not
supported by this socket type.
EFSM
The zmq_msg_send() operation cannot be
performed on this socket at the moment due to the socket not being in the
appropriate state. This error may occur with socket types that switch between
several states, such as ZMQ_REP. See the messaging patterns section of
zmq_socket(3) for more information.
ETERM
The 0MQ context associated with the
specified socket was terminated.
ENOTSOCK
The provided socket was invalid.
EINTR
The operation was interrupted by delivery of a
signal before the message was sent.
EFAULT
Invalid message.
EXAMPLE¶
Filling in a message and sending it to a socket./* Create a new message, allocating 6 bytes for message content */ zmq_msg_t msg; int rc = zmq_msg_init_size (&msg, 6); assert (rc == 0); /* Fill in message content with 'AAAAAA' */ memset (zmq_msg_data (&msg), 'A', 6); /* Send the message to the socket */ rc = zmq_msg_send (&msg, socket, 0); assert (rc == 6);
/* Send a multi-part message consisting of three parts to socket */ rc = zmq_msg_send (&part1, socket, ZMQ_SNDMORE); rc = zmq_msg_send (&part2, socket, ZMQ_SNDMORE); /* Final part; no more parts to follow */ rc = zmq_msg_send (&part3, socket, 0);
SEE ALSO¶
zmq_recv(3) zmq_send(3) zmq_msg_recv(3) zmq_socket(7) zmq(7)AUTHORS¶
This 0MQ manual page was written by Martin Sustrik < sustrik@250bpm.com[1]> and Martin Lucina < mato@kotelna.sk[2]>, and Pieter Hintjens < ph@imatix.com[3]>.NOTES¶
- 1.
- sustrik@250bpm.com
mailto:sustrik@250bpm.com
- 2.
- mato@kotelna.sk
mailto:mato@kotelna.sk
- 3.
- ph@imatix.com
mailto:ph@imatix.com
05/02/2013 | 0MQ 3.2.2 |