ALARMSection: Linux Programmer's Manual (2)
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NAMEalarm - set an alarm clock for delivery of a signal
#include <unistd.h> unsigned int alarm(unsigned int seconds);
DESCRIPTIONalarm() arranges for a SIGALRM signal to be delivered to the process in seconds seconds.
If seconds is zero, no new alarm() is scheduled.
RETURN VALUEalarm() 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 TOSVr4, POSIX.1-2001, 4.3BSD
NOTESalarm() and setitimer(2) share the same timer; calls to one will interfere with use of the other.
SEE ALSOgettimeofday(2), pause(2), select(2), setitimer(2), sigaction(2), signal(2), sleep(3), time(7)