sleep(3) - Linux man page
Name
sleep - Sleep for the specified number of secondsSynopsis
#include <unistd.h> unsigned int sleep(unsigned int seconds);
Description
sleep() makes the current process sleep until seconds seconds have elapsed or a signal arrives which is not ignored.Return Value
Zero if the requested time has elapsed, or the number of seconds left to sleep.Conforming to
POSIX.1-2001.Bugs
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.
