SIGALRM doesn't interrupt gets()?

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?
boaAsked:
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jos010697Commented:
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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System Programming

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