zmq_recv - receive a message part from a socket
int zmq_recv (void *socket, void
*buf, size_t len, int
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
argument shall be truncated. If there are no messages available on
the specified socket
function shall block until
the request can be satisfied. The flags
argument is a combination of
the flags defined below: The buf
argument may be null if len is zero.
Specifies that the operation should be performed in
non-blocking mode. If there are no messages available on the specified
socket, the zmq_recv() function shall fail with errno set
A 0MQ message is composed of 1 or more message parts. 0MQ ensures atomic
delivery of messages: peers shall receive either all message parts
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
(3) option after calling
to determine if there are further parts to receive.
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.
Non-blocking mode was requested and no messages are
available at the moment.
The zmq_recv() operation is not supported by this
The zmq_recv() 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.
The 0MQ context associated with the specified
socket was terminated.
The provided socket was invalid.
The operation was interrupted by delivery of a signal
before a message was available.
Receiving a message from a socket
char buf ;
nbytes = zmq_recv (socket, buf, 256, 0);
assert (nbytes != -1);
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