from small one page howto to huge articles all in one place
 

search text in:





Poll
Which kernel version do you use?





poll results

Last additions:
using iotop to find disk usage hogs

using iotop to find disk usage hogs

words:

887

views:

186345

userrating:

average rating: 1.7 (102 votes) (1=very good 6=terrible)


May 25th. 2007:
Words

486

Views

250360

why adblockers are bad


Workaround and fixes for the current Core Dump Handling vulnerability affected kernels

Workaround and fixes for the current Core Dump Handling vulnerability affected kernels

words:

161

views:

137535

userrating:

average rating: 1.4 (42 votes) (1=very good 6=terrible)


April, 26th. 2006:

Druckversion
You are here: manpages





ZMQ_RECVMSG

Section: 0MQ Manual (3)
Updated: 12/31/2016
Index Return to Main Contents
 

NAME

zmq_recvmsg - receive a message part from a socket  

SYNOPSIS

int zmq_recvmsg (void *socket, zmq_msg_t *msg, int flags);  

DESCRIPTION

The zmq_recvmsg() function shall receive a message part from 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 message parts available on the specified socket the zmq_recvmsg() function shall block until the request can be satisfied. The flags argument is a combination of the flags defined below:

ZMQ_DONTWAIT

Specifies that the operation should be performed in non-blocking mode. If there are no messages available on the specified socket, the zmq_recvmsg() function shall fail with errno set to EAGAIN.


Note

this API method is deprecated in favor of zmq_msg_recv(3).

 

Multi-part messages

A 0MQ message is composed of 1 or more message parts. Each message part is an independent zmq_msg_t in its own right. 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_recvmsg() to determine if there are further parts to receive.  

RETURN VALUE

The zmq_recvmsg() 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.  

ERRORS

EAGAIN

Non-blocking mode was requested and no messages are available at the moment.

ENOTSUP

The zmq_recvmsg() operation is not supported by this socket type.

EFSM

The zmq_recvmsg() 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 a message was available.

EFAULT

The message passed to the function was invalid.
 

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 received from socket */
rc = zmq_recvmsg (socket, &msg, 0);
assert (rc != -1);
/* Release message */
zmq_msg_close (&msg);

Receiving a multi-part message.

int more;
size_t more_size = sizeof (more);
do {
    /* Create an empty 0MQ message to hold the message part */
    zmq_msg_t part;
    int rc = zmq_msg_init (&part);
    assert (rc == 0);
    /* Block until a message is available to be received from socket */
    rc = zmq_recvmsg (socket, &part, 0);
    assert (rc != -1);
    /* Determine if more message parts are to follow */
    rc = zmq_getsockopt (socket, ZMQ_RCVMORE, &more, &more_size);
    assert (rc == 0);
    zmq_msg_close (&part);
} while (more);

 

SEE ALSO

zmq_recv(3) zmq_send(3) zmq_getsockopt(3) zmq_socket(7) zmq(7)  

AUTHORS

This page was written by the 0MQ community. To make a change please read the 0MQ Contribution Policy at m[blue]http://www.zeromq.org/docs:contributingm[].


 

Index

NAME
SYNOPSIS
DESCRIPTION
Multi-part messages
RETURN VALUE
ERRORS
EXAMPLE
SEE ALSO
AUTHORS





Support us on Content Nation
rdf newsfeed | rss newsfeed | Atom newsfeed
- Powered by LeopardCMS - Running on Gentoo -
Copyright 2004-2020 Sascha Nitsch Unternehmensberatung GmbH
Valid XHTML1.1 : Valid CSS : buttonmaker
- Level Triple-A Conformance to Web Content Accessibility Guidelines 1.0 -
- Copyright and legal notices -
Time to create this page: 37.3 ms