sleep - sleep for a specified number of seconds
#include <unistd.h> unsigned int sleep(unsigned int seconds);
sleep() causes the calling thread to sleep either until the number of real-time seconds specified in
seconds have elapsed or until 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.
Using longjmp(3) from a signal handler or modifying the handling of SIGALRM while sleeping will cause undefined results.
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