libzmq/man/man3/zmq_msg_init_size.3

.TH zmq_msg_init_size 3 "" "(c)2007-2009 FastMQ Inc." "0MQ User Manuals"
.SH NAME
zmq_msg_init \- initialises 0MQ message of a specified size
.SH SYNOPSIS
.B int zmq_msg_init_size (zmq_msg_t *msg, size_t size);
.SH DESCRIPTION
Initialises 0MQ message
.IR 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
.IR zmq_msg_t
members, rather use
.IR zmq_msg_data
and
.IR 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.
.SH RETURN VALUE
In case of success the function returns zero. Otherwise it returns -1 and
sets
.IR errno
to the appropriate value.
.SH ERRORS
.IP "\fBENOMEM\fP"
memory to hold the message cannot be allocated.
.SH EXAMPLE
.nf
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);
.fi
.SH SEE ALSO
.BR zmq_msg_close (3)
.BR zmq_msg_init (3)
.BR zmq_msg_init_data (3)
.BR zmq_msg_data (3)
.BR zmq_msg_size (3)
.SH AUTHOR
Martin Sustrik <sustrik at 250bpm dot com>