The zmq_recv() function shall receive a message from the socket referenced by the socket argument and store it in the buffer referenced by the buf argument. Any bytes exceeding the length specified by the len argument shall be truncated. If there are no messages available on the specified socket the zmq_recv() function shall block until the request can be satisfied. The flags argument is a combination of the flags defined below:
A 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 processes multi-part messages must use the ZMQ_RCVMORE zmq_getsockopt(3) option after calling zmq_recv() to determine if there are further parts to receive.
The zmq_recv() function shall return number of bytes in the message if successful. Note that the value can exceed the value of the len parameter in case the message was truncated. If not successful the function shall return -1 and set errno to one of the values defined below.
Receiving a message from a socket.
char buf ; nbytes = zmq_recv (socket, buf, 256, 0); assert (nbytes != -1);
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