alarm - set an alarm clock for delivery of a signal
unsigned int alarm(unsigned int seconds);
alarm() arranges for a SIGALRM signal to be delivered to the
calling process in seconds seconds.
If seconds is zero, any pending alarm is canceled.
In any event any previously set alarm() is canceled.
alarm() returns the number of seconds remaining until any previously
scheduled alarm was due to be delivered, or zero if there was no previously
POSIX.1-2001, POSIX.1-2008, SVr4, 4.3BSD.
alarm() and setitimer(2) share the same timer; calls to one will
interfere with use of the other.
Alarms created by alarm() are preserved across
execve(2) and are not inherited by children created via
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.
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