2.9BSD/usr/man/cat3/sleep.3
SLEEP(3) UNIX Programmer's Manual SLEEP(3)
NAME
sleep - suspend execution for some seconds
SYNTAX
sleep(seconds)
unsigned seconds;
DESCRIPTION
The current process is suspended from execution for the
number of seconds specified by the argument. The actual
suspension time may be up to 1 second less than that
requested, because scheduled wakeups occur at fixed 1-second
intervals, and an arbitrary amount longer because of other
activity in the system.
The routine is implemented by setting an alarm clock signal
and pausing until it occurs. The previous state of this
signal is saved and restored. If the sleep time exceeds the
time to the alarm signal, the process sleeps only until the
signal would have occurred, and the signal is sent 1 second
later.
SEE ALSO
alarm(2), pause(2)
Printed 7/31/83 1