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ALARM (2) | System calls | Unix Manual Pages | :man

NAME

alarm - set an alarm clock for delivery of a signal

CONTENTS

Synopsis
Description
Notes

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)


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