NAME

       zmq_msg_copy - copy content of a message to another message

SYNOPSIS

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

DESCRIPTION

       The zmq_msg_copy() function shall copy the message object referenced by src to the message
       object referenced by dest. The original content of dest, if any, shall be released. You
       must initialise dest before copying to it.

           Caution
           The implementation may choose not to physically copy the message content, rather to
           share the underlying buffer between src and dest. Avoid modifying message content
           after a message has been copied with zmq_msg_copy(), doing so can result in undefined
           behaviour. If what you need is an actual hard copy, allocate a new message using
           zmq_msg_init_size() and copy the message content using memcpy().

           Caution
           Never access zmq_msg_t members directly, instead always use the zmq_msg family of
           functions.

RETURN VALUE

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

ERRORS

       EFAULT
           Invalid message.

EXAMPLE

       Copying a message.

           zmq_msg_t msg;
           zmq_msg_init_size (&msg, 255);
           memcpy (zmq_msg_data (&msg, "Hello, World", 12);
           zmq_msg_t copy;
           zmq_msg_init (&copy);
           zmq_msg_copy (&copy, &msg);
           ...
           zmq_msg_close (&copy);
           zmq_msg_close (&msg);

SEE ALSO

       zmq_msg_move(3) zmq_msg_init(3) zmq_msg_init_size(3) zmq_msg_init_data(3) zmq_msg_close(3)
       zmq(7)

AUTHORS

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