Linux 2.6 - man page for sleep (linux section 3)
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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 calling thread 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, if the
call was interrupted by a signal handler.
sleep() may be implemented using SIGALRM; mixing calls to alarm(2) and sleep() is a bad
Using longjmp(3) from a signal handler or modifying the handling of SIGALRM while sleeping
will cause undefined results.
alarm(2), nanosleep(2), signal(2), signal(7)
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GNU 2010-02-03 SLEEP(3)
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