alarm - set an alarm clock for delivery of a signal
unsigned int alarm(unsigned int seconds);
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.
POSIX.1-2001, POSIX.1-2008, SVr4, 4.3BSD.
Scheduling delays can, as ever, cause the execution of the process to be delayed by an arbitrary amount of time.
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