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ALARM(3) BSD Library Functions Manual ALARM(3)
alarm -- set signal timer alarm
Standard C Library (libc, -lc)
alarm(unsigned int seconds);
This interface is made obsolete by setitimer(2).
The alarm() function sets a timer to deliver the signal SIGALRM to the calling process
seconds after the call to alarm(). If an alarm has already been set with alarm() but has
not been delivered, another call to alarm() will supersede the prior call. The request
alarm(0) voids the current alarm and the signal SIGALRM will not be delivered. The maximum
number of seconds allowed is 2147483647.
The return value of alarm() is the amount of time left on the timer from a previous call to
alarm(). If no alarm is currently set, the return value is 0. If there is an error setting
the timer, alarm() returns ((unsigned int) -1).
setitimer(2), sigaction(2), sigsuspend(2), signal(3), sigvec(3), sleep(3), ualarm(3),
The alarm() function conforms to ISO/IEC 9945-1:1990 (``POSIX.1'').
An alarm() function appeared in Version 7 AT&T UNIX.
BSD April 19, 1994 BSD
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