int linx_sigattr(const LINX *linx, const union LINX_SIGNAL **sig, uint32_t attr, void **value);
linx is the handle to the LINX endpoint, which owns the sig signal buffer.
attr is the attribute of the sig signal buffer.
value is the returned value that corresponds to attr which in turn is the name of the attribute set on the sig signal buffer. attr can have the following values.
The OOB attribute has no affect on further communication using the
signal, it is kept to make it possible for the receiving LINX endpoint
to know if a signal is OOB or not. If the signal is sent to another LINX
endpoint and the OOB attribute needs to be preserved, the linx_send_w_opt(3)
call needs to be used for that signaling. If the received OOB signal is
sent with linx_send(3)
linx_send_w_s(3) the OOB attribute is lost and the signal is transmitted as a in band signal.
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