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SLEEP(3) Linux Programmer's Manual SLEEP(3)
sleep - Sleep for the specified number of seconds
unsigned int sleep(unsigned int seconds);
sleep() makes the current process sleep until seconds seconds have elapsed or a signal
arrives which is not ignored.
Zero if the requested time has elapsed, or the number of seconds left to sleep.
sleep() may be implemented using SIGALRM; mixing calls to alarm() and sleep() is a bad
Using longjmp() from a signal handler or modifying the handling of SIGALRM while sleeping
will cause undefined results.
GNU 1993-04-07 SLEEP(3)
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