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RedHat 9 (Linux i386) - man page for sleep (redhat section 3)

SLEEP(3)						     Linux Programmer's Manual							  SLEEP(3)

NAME
sleep - Sleep for the specified number of seconds
SYNOPSIS
#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
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.
SEE ALSO
signal(2), alarm(2)
GNU
1993-04-07 SLEEP(3)