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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 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 previ-
ously scheduled alarm.
NOTES
alarm() and setitimer() share the same timer; calls to one will inter-
fere 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, 4.3BSD
SEE ALSO
gettimeofday(2), pause(2), select(2), setitimer(2), sigaction(2), sig
nal(2), sleep(3)
Linux 1993-07-21 ALARM(2)
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This page was generated on Tue Feb 13 02:17:40 GMT 2007
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