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1003.1b-93 #7 _____________________________________________________________________________ Interpretation Number: XXXX Topic: sigaction Relevant Sections: 3.3.4.2. Page 72 lines 915-923 Interpretation Request: (Defect Report) ----------------------- From: ajosey@xopen.org (Andrew Josey) Date: Thu Mar 7 15:18:23 GMT 1996 (This request raised on Behalf of the X/Open Base working group) IEEE Std 1003.1b-1993 Section 3.3.4.2. Page 72 lines 915-923 describes what happens if a signal is pending that is dispatched at a time when a signal handler was in place expecting three arguments. This section does not describe what happens to the second and third arguments of a signal handler that catches a signal that was dispatched when a signal handler expecting one argument was installed. What is the conformant behaviour in this case? Interpretation response ------------------------ The question as asked has some ambiguity and would have different answers based up which question is meant If a signal is generated during a time that SA_SIGINFO is set in sa_flags, sigqueue can pass a si_value and the signal has an associated si_code. If sigaction is called with sa_flags clear, then the standard is clear that 'the signal-catching function shall be invoked with only a single argument' (pg 72 line 917): the signo is delivered. If a signal is generated during a time that SA_SIGINFO is cleared in sa_flags, sigqueue still has a si_value and the associated si_code. If sigaction is then called before delivery with sa_flags set, then the standard is clear that 'The application specified value shall be passed to the signal-catching function...' (pg 72 line 922-923). Rationale ------------- None. Forwarded to Interpretations group: Mar 7 1996 Finalised: Apr 9 1996