mirror of
https://github.com/zeromq/libzmq.git
synced 2024-12-31 01:43:02 +08:00
78 lines
2.1 KiB
Plaintext
78 lines
2.1 KiB
Plaintext
zmq_recv(3)
|
|
===========
|
|
|
|
|
|
NAME
|
|
----
|
|
zmq_recv - receive a message from a socket
|
|
|
|
|
|
SYNOPSIS
|
|
--------
|
|
*int zmq_recv (void '*socket', zmq_msg_t '*msg', int 'flags');*
|
|
|
|
|
|
DESCRIPTION
|
|
-----------
|
|
The _zmq_recv()_ function shall dequeue a message from the underlying _message
|
|
queue_ associated with the socket referenced by the 'socket' argument and store
|
|
it in the message referenced by the 'msg' argument. Any content previously
|
|
stored in 'msg' shall be properly deallocated. If there are no messages
|
|
available to be dequeued from the underlying _message queue_ associated with
|
|
'socket' the _zmq_recv()_ function shall block until the request can be
|
|
satisfied. 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 there
|
|
are no messages available to be dequeued from the underlying _message queue_
|
|
associated with 'socket', the _zmq_recv()_ function shall fail with 'errno' set
|
|
to EAGAIN.
|
|
|
|
|
|
RETURN VALUE
|
|
------------
|
|
The _zmq_recv()_ 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 no messages are available at the moment.
|
|
*ENOTSUP*::
|
|
The _zmq_recv()_ operation is not supported by this socket type.
|
|
*EFSM*::
|
|
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 linkzmq:zmq_socket[3] for more information.
|
|
*ETERM*::
|
|
The associated context was terminted.
|
|
|
|
|
|
EXAMPLE
|
|
-------
|
|
.Receiving a message from a socket
|
|
----
|
|
/* Create an empty 0MQ message */
|
|
zmq_msg_t msg;
|
|
int rc = zmq_msg_init (&msg);
|
|
assert (rc == 0);
|
|
/* Block until a message is available to be dequeued from socket */
|
|
rc = zmq_recv (socket, &msg, 0);
|
|
assert (rc == 0);
|
|
----
|
|
|
|
|
|
SEE ALSO
|
|
--------
|
|
linkzmq:zmq_send[3]
|
|
linkzmq:zmq_socket[7]
|
|
linkzmq:zmq[7]
|
|
|
|
|
|
AUTHORS
|
|
-------
|
|
The 0MQ documentation was written by Martin Sustrik <sustrik@250bpm.com> and
|
|
Martin Lucina <mato@kotelna.sk>.
|