Provided by: libzmq-dev_2.1.11-1ubuntu1_i386 bug

NAME

       zmq_send - send a message on a socket

SYNOPSIS

       int zmq_send (void *socket, zmq_msg_t *msg, int flags);

DESCRIPTION

       The zmq_send() function shall queue the message referenced by the msg
       argument to be sent to the socket referenced by the socket argument.
       The flags argument is a combination of the flags defined below:

       ZMQ_NOBLOCK
           Specifies that the operation should be performed in non-blocking
           mode. If the message cannot be queued on the socket, the zmq_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.

       The zmq_msg_t structure passed to zmq_send() is nullified during the
       call. If you want to send the same message to multiple sockets you have
       to copy it using (e.g. using zmq_msg_copy()).

           Note
           A successful invocation of zmq_send() does not indicate that the
           message has been transmitted to the network, only that it has been
           queued on the socket and 0MQ has assumed responsibility for the
           message.

   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.

       An application wishing to send a multi-part message does so by
       specifying the ZMQ_SNDMORE flag to zmq_send(). The presence of this
       flag indicates to 0MQ that the message being sent is a multi-part
       message and that more message parts are to follow. When the application
       wishes to send the final message part it does so by calling zmq_send()
       without the ZMQ_SNDMORE flag; this indicates that no more message parts
       are to follow.

RETURN VALUE

       The zmq_send() function shall return zero if successful. Otherwise it
       shall return -1 and set errno to one of the values defined below.

ERRORS

       EAGAIN
           Non-blocking mode was requested and the message cannot be sent at
           the moment.

       ENOTSUP
           The zmq_send() operation is not supported by this socket type.

       EFSM
           The zmq_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_send (socket, &msg, 0);
           assert (rc == 0);

       Sending a multi-part message.

           /* Send a multi-part message consisting of three parts to socket */
           rc = zmq_send (socket, &part1, ZMQ_SNDMORE);
           rc = zmq_send (socket, &part2, ZMQ_SNDMORE);
           /* Final part; no more parts to follow */
           rc = zmq_send (socket, &part3, 0);

SEE ALSO

       zmq_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]>.

NOTES

        1. sustrik@250bpm.com
           mailto:sustrik@250bpm.com

        2. mato@kotelna.sk
           mailto:mato@kotelna.sk