CentOS 7.0 - man page for alarm (centos section 2)
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ALARM(2) Linux Programmer's Manual ALARM(2)
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
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 scheduled alarm.
SVr4, POSIX.1-2001, 4.3BSD.
alarm() and setitimer(2) share the same timer; calls to one will interfere with use of the
sleep(3) may be implemented using SIGALRM; mixing calls to alarm() and sleep(3) is a bad
Scheduling delays can, as ever, cause the execution of the process to be delayed by an
arbitrary amount of time.
gettimeofday(2), pause(2), select(2), setitimer(2), sigaction(2), signal(2), sleep(3),
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Linux 2013-04-18 ALARM(2)
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