xs_msg_init_data (3)

typedef void (xs_free_fn) (void *data, void *hint);

int xs_msg_init_data (xs_msg_t *msg, void *data, size_t size, xs_free_fn *ffn, void *hint);

The xs_msg_init_data() function shall initialise the message object referenced by msg to represent the content referenced by the buffer located at address data, size bytes long. No copy of data shall be performed and the library shall take ownership of the supplied buffer.

If provided, the deallocation function ffn shall be called once the data buffer is no longer required by the library, with the data and hint arguments supplied to xs_msg_init_data().

Caution

Never access xs_msg_t members directly, instead always use the xs_msg family of functions.

Caution

The deallocation function ffn needs to be thread-safe, since it will be called from an arbitrary thread.

Caution

The functions xs_msg_init(), xs_msg_init_data() and xs_msg_init_size() are mutually exclusive. Never initialize the same xs_msg_t twice.

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

ENOMEM

Insufficient storage space is available.

Initialising a message from a supplied buffer.

void my_free (void *data, void *hint)
{
    free (data);
}

    /*  ...  */

void *data = malloc (6);
assert (data);
memcpy (data, "ABCDEF", 6);
xs_msg_t msg;
rc = xs_msg_init_data (&msg, data, 6, my_free, NULL);
assert (rc == 0);

xs_msg_init_size(3) xs_msg_init(3) xs_msg_close(3) xs_msg_data(3) xs_msg_size(3) xs(7)

The Crossroads documentation was written by Martin Sustrik <\m[blue][email protected]\m[]\s-2\u[1]\d\s+2> and Martin Lucina <\m[blue][email protected]\m[]\s-2\u[2]\d\s+2>.

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