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

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

     usleep - suspend execution for interval of microseconds

     #include <unistd.h>

     usleep(useconds_t microseconds);

     The usleep() function suspends execution of the calling process for
     microseconds microseconds of time.  System activity or time spent in pro-
     cessing the call may lengthen the sleep slightly.

     This routine 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 usleep() interferes with interval timers anymore).

     If the usleep() function returns because the requested time has elapsed,
     the value returned will be zero.

     If the usleep() function returns due to the delivery of a signal, the
     value returned will be the -1, and the global variable errno will be set
     to indicate the interruption.

     If any of the following conditions occur, the usleep() function shall re-
     turn -1 and set errno to the corresponding value.

     [EINTR]       usleep() was interrupted by the delivery of a signal.

     [EINVAL]      useconds specified a value of 1,000,000 or more microsec-

     A microsecond is 0.000001 seconds.

     getitimer(2),  nanosleep(2),  setitimer(2),  alarm(3),  sigpause(3),
     sleep(3),  ualarm(3)

     The usleep() function conforms to X/Open Portability Guide Issue 4.2

     The usleep() function appeared in 4.3BSD.

OpenBSD 2.6                    November 4, 1997                              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 usleep(3) functions
OpenBSD sources for usleep(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

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