IEEE Standards Interpretation for IEEE Std 1003.1™-1990 IEEE Standard for Information Technology--Portable Operating System Interfaces (POSIX®)
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Interpretation Number: #111
Topic: signal concepts Relevant Sections: p78 line 870, p79 line 883 PASC
At 870, there's the "with a single exception clause". At 883 in the sentence beginning with "If" would seem to disallow that exception. (That is, if a return is executed by the handler, all would seem to be required to work right, regardless of what went before.)
Replace the sentence with a pointer to the discussion of signal-safe and unsafe functions.
The standard is unclear on this issue, and no conformance distinction can be made between alternative implementations based on this. This is being referred to the sponsor.
Notes to Project Editor (not part of this interpretation)
Add "except as ..." on line 870: "...except as noted for unsafe functions". Forwarded to Interpretations group: 19 June 2000 Proposed resolution: 25 July 2000 Finalized interpretation: 29 August 2000