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75 lines
1.9 KiB
Plaintext
75 lines
1.9 KiB
Plaintext
= zmq_msg_get(3)
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== NAME
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zmq_msg_get - get message property
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== SYNOPSIS
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*int zmq_msg_get (zmq_msg_t '*message', int 'property');*
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== DESCRIPTION
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The _zmq_msg_get()_ function shall return the value for the property
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specified by the 'property' argument for the message pointed to by the
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'message' argument.
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The following properties can be retrieved with the _zmq_msg_get()_ function:
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*ZMQ_MORE*::
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Indicates that there are more message frames to follow after the 'message'.
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*ZMQ_SRCFD*::
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Returns the file descriptor of the socket the 'message' was read from. This
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allows application to retrieve the remote endpoint via 'getpeername(2)'. Be
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aware that the respective socket might be closed already, reused even.
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Currently only implemented for TCP sockets.
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*ZMQ_SHARED*::
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Indicates that a message MAY share underlying storage with another copy of
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this message.
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== RETURN VALUE
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The _zmq_msg_get()_ function shall return the value for the property if
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successful. Otherwise it shall return `-1` and set 'errno' to one of the
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values defined below.
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== ERRORS
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*EINVAL*::
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The requested _property_ is unknown.
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== EXAMPLE
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.Receiving a multi-frame message
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----
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zmq_msg_t frame;
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while (true) {
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// Create an empty 0MQ message to hold the message frame
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int rc = zmq_msg_init (&frame);
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assert (rc == 0);
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// Block until a message is available to be received from socket
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rc = zmq_msg_recv (socket, &frame, 0);
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assert (rc != -1);
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if (zmq_msg_get (&frame, ZMQ_MORE))
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fprintf (stderr, "more\n");
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else {
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fprintf (stderr, "end\n");
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break;
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}
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zmq_msg_close (&frame);
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}
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----
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== SEE ALSO
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* xref:zmq_msg_set.adoc[zmq_msg_set]
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* xref:zmq_msg_init.adoc[zmq_msg_init]
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* xref:zmq_msg_close.adoc[zmq_msg_close]
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* xref:zmq.adoc[zmq]
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== AUTHORS
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This page was written by the 0MQ community. To make a change please
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read the 0MQ Contribution Policy at <http://www.zeromq.org/docs:contributing>.
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