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STREAMS polling and multiplexing

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


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