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zmq_msg_init_data - initialise 0MQ message from a supplied buffer
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*typedef void (zmq_free_fn) (void '*data', void '*hint');*
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*int zmq_msg_init_data (zmq_msg_t '*msg', void '*data', size_t 'size', zmq_free_fn '*ffn', void '*hint');*
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The _zmq_msg_init_data()_ function shall initialise the message object
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referenced by 'msg' to represent the content referenced by the buffer located
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at address 'data', 'size' bytes long. No copy of 'data' shall be performed and
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0MQ shall take ownership of the supplied buffer.
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If provided, the deallocation function 'ffn' shall be called once the data
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buffer is no longer required by 0MQ, with the 'data' and 'hint' arguments
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supplied to _zmq_msg_init_data()_.
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CAUTION: Never access 'zmq_msg_t' members directly, instead always use the
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_zmq_msg_ family of functions.
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CAUTION: The deallocation function 'ffn' needs to be thread-safe, since it
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will be called from an arbitrary thread.
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CAUTION: The functions _zmq_msg_init()_, _zmq_msg_init_data()_ and
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_zmq_msg_init_size()_ are mutually exclusive. Never initialize the same
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The _zmq_msg_init_data()_ function shall return zero if successful. Otherwise
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it shall return `-1` and set 'errno' to one of the values defined below.
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Insufficient storage space is available.
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.Initialising a message from a supplied buffer
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void my_free (void *data, void *hint)
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void *data = malloc (6);
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memcpy (data, "ABCDEF", 6);
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rc = zmq_msg_init_data (&msg, data, 6, my_free, NULL);
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linkzmq:zmq_msg_init_size[3]
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linkzmq:zmq_msg_init[3]
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linkzmq:zmq_msg_close[3]
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linkzmq:zmq_msg_data[3]
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linkzmq:zmq_msg_size[3]
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The 0MQ documentation was written by Martin Sustrik <sustrik@250bpm.com> and
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Martin Lucina <martin@lucina.net>.
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doc/zmq_msg_init_data.txt
