ALARM(3) BSD Library Functions Manual ALARM(3)NAMEalarm — set signal timer alarmSYNOPSIS
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
supersede the prior call. The request alarm(0) voids the current alarm.
SEE ALSOsigaction(2), setitimer(2), sigpause(2), sigvec(2), signal(3), sleep(3),
An alarm() function appeared in Version 7 AT&T UNIX.
4th Berkeley Distribution April 19, 1994 4th Berkeley Distribution