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sleep - sleep for the specified number of seconds
#include <unistd.h> 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 idea. Using longjmp(3) from a signal handler or modifying the handling of SIGALRM while sleeping will cause undefined results.
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