sleep - Sleep for the specified number of seconds
#include <unistd.h>
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.
POSIX.1
sleep() may be implemented using SIGALRM; mixing calls to alarm() and
sleep() is a bad idea.
Using longjmp() from a signal handler or modifying the handling of
SIGALRM while sleeping will cause undefined results.
signal(2), alarm(2)
GNU 1993-04-07 SLEEP(3)
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