Extended signals

To enable a process to obtain the band and event associated with ``SIGPOLL'' more readily, STREAMS supports extended signals. For the given events, a special code is defined in <siginfo.h> that describes the reason ``SIGPOLL'' was generated. ``siginfo_t data available to the signal handler'' describes the data available in the siginfo_t structure passed to the signal handler.

siginfo_t data available to the signal handler

Event	si_signo	si_code	si_band	si_errno
S_INPUT	SIGPOLL	POLL_IN	band readable	unused
S_OUTPUT	SIGPOLL	POLL_OUT	band writable	unused
S_MSG	SIGPOLL	POLL_MSG	band signaled	unused
S_ERROR	SIGPOLL	POLL_ERR	unused	Stream error
S_HANGUP	SIGPOLL	POLL_HUP	unused	unused
S_HIPRI	SIGPOLL	POLL_PRI	unused	unused