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RocketLink!--> Man page versions: OpenBSD FreeBSD RedHat Solaris Others

[IEEE Std1003.1-1990 (``POSIX'').]

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

     sleep - suspend process execution for interval of seconds

     #include <unistd.h>

     unsigned int
     sleep(unsigned int seconds);

     The sleep() function suspends execution of the calling process until ei-
     ther the number of seconds specified by seconds have elapsed or a signal
     is delivered to the calling process and its action is to invoke a signal-
     catching function or to terminate the process.  The suspension time may
     be longer than requested due to the scheduling of other activity by the

     This function is implemented using nanosleep(2);  it requires one system
     call each time it is invoked.  A similar but less compatible function can
     be obtained with a single select(2);  such a function would not restart
     after signals, and also does not interfere with other uses of
     setitimer(2) (not that sleep() interferes with interval timers anymore).

     If the sleep() function returns because the requested time has elapsed,
     the value returned will be zero.  If the sleep() function returns due to
     the delivery of a signal, the value returned will be the unslept amount
     (the request time minus the time actually slept) in seconds.

     nanosleep(2),  select(2),  setitimer(2),  sigaction(2),  sigsuspend(2),
     alarm(3),  pause(3),  usleep(3)

     The sleep() function conforms to IEEE Std1003.1-1990 (``POSIX'').

     A sleep() function appeared in Version 7 AT&T UNIX.

OpenBSD 2.6                      June 4, 1993                                1

Source: OpenBSD 2.6 man pages. Copyright: Portions are copyrighted by BERKELEY
SOFTWARE DESIGN, INC., The Regents of the University of California, Massachusetts
Institute of Technology, Free Software Foundation, FreeBSD Inc., and others.

(Corrections, notes, and links courtesy of RocketAware.com)

[Detailed Topics]
FreeBSD Sources for sleep(3) functions
OpenBSD sources for sleep(3)

[Overview Topics]

Up to: Process Signals and Events - Sending and handling signals and events.
Up to: Current Process Control - control of the currently running process, longjmp, wait, sleep, argument processing

RocketLink!--> Man page versions: OpenBSD FreeBSD RedHat Solaris Others

[IEEE Std1003.1-1990 (``POSIX'').]

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