zmq_msg_copy(3)

1ZMQ_MSG_COPY(3)                   0MQ Manual                   ZMQ_MSG_COPY(3)
2
3
4

NAME

6       zmq_msg_copy - copy content of a message to another message
7

SYNOPSIS

9       int zmq_msg_copy (zmq_msg_t *dest, zmq_msg_t *src);
10

DESCRIPTION

12       The zmq_msg_copy() function shall copy the message object referenced by
13       src to the message object referenced by dest. The original content of
14       dest, if any, shall be released. You must initialise dest before
15       copying to it.
16
17           Caution
18           The implementation may choose not to physically copy the message
19           content, rather to share the underlying buffer between src and
20           dest. Avoid modifying message content after a message has been
21           copied with zmq_msg_copy(), doing so can result in undefined
22           behaviour. If what you need is an actual hard copy, initialize a
23           new message using zmq_msg_init_buffer() with the message content.
24
25           Caution
26           Never access zmq_msg_t members directly, instead always use the
27           zmq_msg family of functions.
28

RETURN VALUE

30       The zmq_msg_copy() function shall return zero if successful. Otherwise
31       it shall return -1 and set errno to one of the values defined below.
32

ERRORS

34       EFAULT
35           Invalid message.
36

EXAMPLE

38       Copying a message.
39
40           zmq_msg_t msg;
41           zmq_msg_init_buffer (&msg, "Hello, World", 12);
42           zmq_msg_t copy;
43           zmq_msg_init (&copy);
44           zmq_msg_copy (&copy, &msg);
45           ...
46           zmq_msg_close (&copy);
47           zmq_msg_close (&msg);
48
49

AUTHORS

55       This page was written by the 0MQ community. To make a change please
56       read the 0MQ Contribution Policy at
57       http://www.zeromq.org/docs:contributing.
58
59
60
610MQ 4.3.4                         07/23/2021                   ZMQ_MSG_COPY(3)