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STREAMS Programming Guide

Extended Signals

So that a process can obtain the band and event associated with SIGPOLL more readily, STREAMS supports extended signals. For the given events, a special code is defined in <sys/siginfo.h> that describes the reason SIGPOLL was generated. Table 3–6 describes the data available in the siginfo_t structure passed to the signal handler.

Table 3–6 Data in siginfo_t Structure

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