Thread: Reliable Singal question

  1. #1
    Join Date
    May 2007
    Berkeley, CA

    Reliable Singal question

    The following question stems from page 329 in book "Advanced Programming in the Unix Environment" by Stevens and Rago.

    Near the top, they say
    Note that we must use sigemptyset to initialize the sa_mask member of the structure. We're not guaranteed that
    act.sa_mask = 0;
    does the same thing
    The question is why wouldn't act.sa_mask =0 do the same thing as sigemptyset(& ?

  2. #2
    and the hat of int overfl Salem's Avatar
    Join Date
    Aug 2001
    The edge of the known universe
    What if sa_mask were a structure, and not a simple 32-bit unsigned long (for example) ?
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

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