For socket types (DEALER, PUSH) that block when there are no available peers (or all peers have 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.
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.
/* 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);