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SIGALRM doesn't interrupt gets()?

Posted on 1997-07-21
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Last Modified: 2013-12-26
I supposed that system calls such gets(), getc() should be interrupted by SIGALRM. And it seems to be true under Unixware 2.01, but it doesn't work under Linux. Why? What should I use to implement timed read?
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Question by:boa
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jos010697 earned 800 total points
ID: 1294019
You're halfway there; the default behavior of 'read' is to
restart after it has been interrupted by a signal _and_ if
nothing has been read just before the signal was raised.
BTW, gets() or getc() aren't system calls; it's the 'read'
call underneath that does all the work.

Check out the sigaction() call; it tells the signal handlers
_not_ to restart certain interrupted system calls ('read' is
one of them), by resetting the SA_RESTART bit ...

kind regards,

Jos aka jos@and.nl
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