ALARM(3) BSD Programmer's Manual ALARM(3)
alarm - set signal timer alarm
This interface is made obsolete by setitimer(2).
The alarm() function waits a count of seconds before asserting the termi-
nating signal SIGALRM. When the signal has successfully been caught,
alarm() returns the amount of time left on the clock. The maximum number
of seconds allowed is 2147483647.
If an alarm has been set with alarm(), another call to alarm() will su-
persede the prior call. The request alarm(0) voids the current alarm.
sigaction(2), setitimer(2), sigpause(2), sigvec(2), signal(3),
sleep(3), ualarm(3), usleep(3)
An alarm() function appeared in Version 7 AT&T UNIX.
4th Berkeley Distribution April 19, 1994 1