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author | Martin Hurton <hurtonm@gmail.com> | 2010-02-10 17:14:21 +0100 |
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committer | Martin Hurton <hurtonm@gmail.com> | 2010-02-10 17:14:21 +0100 |
commit | 7cab423fc20e46f54fa561e51b566cc8a63ca5c1 (patch) | |
tree | fa926432b8392e7717b7fbc1ecaf973ba60cb970 /doc/zmq_msg_init_size.txt | |
parent | bc9b7f1f54b9dcf754021f1f7eb766d71cc97f29 (diff) | |
parent | 354efc513fdb4096f8830e6c2e3e8f1311303e61 (diff) |
Merge branch 'master' of github.com:sustrik/zeromq2
Diffstat (limited to 'doc/zmq_msg_init_size.txt')
-rw-r--r-- | doc/zmq_msg_init_size.txt | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/doc/zmq_msg_init_size.txt b/doc/zmq_msg_init_size.txt new file mode 100644 index 0000000..9f09ade --- /dev/null +++ b/doc/zmq_msg_init_size.txt @@ -0,0 +1,61 @@ +zmq_msg_init_size(3) +==================== + + +NAME +---- +zmq_msg_init_size - initialises 0MQ message of a specified size + + +SYNOPSIS +-------- +'int zmq_msg_init_size (zmq_msg_t *msg, size_t size);' + + +DESCRIPTION +----------- +Initialises 0MQ message 'size' bytes long. The implementation chooses whether +it is more efficient to store message content on the stack (small messages) or +on the heap (large messages). Therefore, never access message data directly +via 'zmq_msg_t' members, rather use 'zmq_msg_data' and 'zmq_msg_size' functions +to get message data and size. Note that the message data are not nullified to +avoid the associated performance impact. Thus you should expect your message to +contain bogus data after this call. + + +RETURN VALUE +------------ +In case of success the function returns zero. Otherwise it returns -1 and +sets 'errno' to the appropriate value. + + +ERRORS +------ +*ENOMEM*:: +memory to hold the message cannot be allocated. + + +EXAMPLE +------- +---- +zmq_msg_t msg; +rc = zmq_msg_init_size (&msg, 6); +assert (rc == 0); +memcpy (zmq_msg_data (&msg), "ABCDEF", 6); +rc = zmq_send (s, &msg, 0); +assert (rc == 0); +---- + + +SEE ALSO +-------- +linkzmq:zmq_msg_close[3] +linkzmq:zmq_msg_init[3] +linkzmq:zmq_msg_init_data[3] +linkzmq:zmq_msg_data[3] +linkzmq:zmq_msg_size[3] + + +AUTHOR +------ +Martin Sustrik <sustrik at 250bpm dot com> |