alarm - set an alarm clock for delivery of a signal


SYNOPSIS

       #include <unistd.h>

       unsigned int alarm(unsigned int seconds);


DESCRIPTION

       alarm arranges for a SIGALRM signal to be delivered to the
       process in seconds seconds.

       If seconds is zero, no new alarm is scheduled.

       In any event any previously set alarm is cancelled.


RETURN VALUE

       alarm returns the number of seconds  remaining  until  any
       previously  scheduled  alarm  was  due to be delivered, or
       zero if there was no previously scheduled alarm.


NOTES

       alarm and setitimer share the same  timer;  calls  to  one
       will interfere with use of the other.

       sleep()  may be implemented using SIGALRM; mixing calls to
       alarm() and sleep() is a bad idea.

       Scheduling delays can, as ever, cause the execution of the
       process to be delayed by an arbitrary amount of time.


CONFORMING TO

       SVr4, SVID, POSIX, X/OPEN, BSD 4.3


SEE ALSO

       setitimer(2),  signal(2),  sigaction(2),  gettimeofday(2),
       select(2), pause(2), sleep(3)