alarm - phpMan

ALARM(2)                   Linux Programmer’s Manual                  ALARM(2)



NAME
       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 sec-
       onds.

       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)



Linux                             1993-07-21                          ALARM(2)

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