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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 calling process in
       seconds seconds.

       If seconds is zero, no new alarm() is scheduled.

       In any event any previously set alarm() is canceled.

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.

CONFORMING TO
       SVr4, POSIX.1-2001, 4.3BSD.

NOTES
       alarm() and setitimer(2) share the same timer; calls to one will interfere with use
       of the other.

       sleep(3)  may be implemented using SIGALRM; mixing calls to alarm() and sleep(3) is
       a bad idea.

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

SEE ALSO
       gettimeofday(2),   pause(2),   select(2),  setitimer(2),  sigaction(2),  signal(2),
       sleep(3), time(7)

COLOPHON
       This page is part of release 3.22 of the Linux man-pages project.  A description of
       the  project, and information about reporting bugs, can be found at http://www.ker-
       nel.org/doc/man-pages/.



Linux                             2008-06-12                          ALARM(2)

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