union LINX_SIGNAL *linx_alloc(LINX *linx, LINX_OSBUFSIZE size, LINX_SIGSELECT sig_no);
The new buffer is owned by the LINX
endpoint, on which it was created. Also a received signal buffer is owned
by the receiving LINX endpoint. Unless the buffer is sent (a received buffer
can be reused for sending), the owner must free the buffer by calling
with the same linx handle. The buffer will also be freed
if the owning LINX endpoint is closed or the calling process exits. The
buffer ownership is transferred when successfully using any of the transmission
functions, e.g. linx_send(3)
linx is the handle to the LINX endpoint.
size is the size in bytes of the new signal buffer. The minimum size is
4 bytes, needed to store the sig_no. The maximum size of the signal buffer
is 65536 bytes. Thus the space for a payload, excluding the signal number,
can be in the range 0 - 65532 bytes.
sig_no is the signal number, stored at the beginning of the signal buffer.
If linx is not a valid LINX endpoint, i.e. created with linx_open(3) then abort(3) is called.
EMSGSIZE if size is invalid.
ENOMEM if there is not enough memory.
If a process, which has allocated signal buffers, fork(2) , both instances will have copies of the signal buffers. As only one process may use a LINX endpoint and the endpoint's resources, either the parent or the child __must__ close the LINX endpoint with linx_close(3) .
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