Originální popis anglicky:
alarm - set an alarm clock for delivery of a signal
Návod, kniha: Linux Programmer's Manual
#include <unistd.h>
unsigned int alarm(unsigned int seconds);
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.
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.
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.
SVr4, SVID, POSIX, X/OPEN, BSD 4.3
gettimeofday(2),
pause(2),
select(2),
setitimer(2),
sigaction(2),
signal(2),
sleep(3)
