sleep (3)

#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.

POSIX.1-2001.

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.

alarm(2), nanosleep(2), signal(2), signal(7)

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