.TH zmq_msg_init_data 3 "" "(c)2007-2009 FastMQ Inc." "0MQ User Manuals"
.SH NAME
zmq_msg_init \- initialises 0MQ message from the given data
.SH SYNOPSIS
.nf
.B typedef void (zmq_free_fn) (void *data);
.B int zmq_msg_init_data (zmq_msg_t *msg, void *data, size_t size, zmq_free_fn *ffn);
.fi
.SH DESCRIPTION
Initialise a message from a supplied buffer. Message isn't copied,
instead 0MQ infrastructure takes ownership of the buffer located at address
.IR data ,
.IR size
bytes long. 
Deallocation function (
.IR ffn
) will be called once the data are not needed anymore. Note that deallocation
function prototype is designed so that it complies with standard C
.IR free
function. When using a static constant buffer,
.IR ffn
may be NULL to prevent subsequent deallocation.
.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
No errors are defined.
.SH EXAMPLE
.nf
void *data = malloc (6);
assert (data);
memcpy (data, "ABCDEF", 6);
zmq_msg_t msg;
rc = zmq_msg_init_data (&msg, data, 6, free);
assert (rc == 0);
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_size (3)
.BR zmq_msg_data (3)
.BR zmq_msg_size (3)
.SH AUTHOR
Martin Sustrik <sustrik at 250bpm dot com>