ZMQ_SEND - Online Linux Manual PageSection : 3
Updated : 01/21/2023
Source : 0MQ 4​.3​.4
Note : 0MQ Manual
NAMEzmq_send − send a message part on a socket
SYNOPSISint zmq_send (void *socket, const void *buf, size_t len, int flags);
DESCRIPTIONThe zmq_send() function shall queue a message created from the buffer referenced by the buf and len arguments​. The flags argument is a combination of the flags defined below: ZMQ_DONTWAIT For socket types (DEALER, PUSH) that block (either with ZMQ_IMMEDIATE option set and no peer available, or all peers having full high−water mark), 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​. .it 1 an-trap
Note ¶.br 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 messagesA 0MQ message is composed of 1 or more message parts​. 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​. An application that sends multi−part messages must use the ZMQ_SNDMORE flag when sending each message part except the final one​.
RETURN VALUEThe zmq_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​.
ERRORSEAGAIN 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​. EINVAL The sender tried to send multipart data, which the socket type does not allow​. 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​. EHOSTUNREACH The message cannot be routed​.
EXAMPLESending a multi-part message. /* Send a multi−part message consisting of three parts to socket */ rc = zmq_send (socket, "ABC", 3, ZMQ_SNDMORE); assert (rc == 3); rc = zmq_send (socket, "DEFGH", 5, ZMQ_SNDMORE); assert (rc == 5); /* Final part; no more parts to follow */ rc = zmq_send (socket, "JK", 2, 0); assert (rc == 2);
SEE ALSOzmq_send_const(3) zmq_recv(3) zmq_socket(7) zmq(7)
AUTHORSThis page was written by the 0MQ community​. To make a change please read the 0MQ Contribution Policy at http://www​.zeromq​.org/docs:contributing​. 0
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