usleep.3 revision 28126
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@(#)usleep.3 8.1 (Berkeley) 6/4/93
.Dd June 4, 1993 .Dt USLEEP 3 .Os BSD 4.3 .Sh NAME .Nm usleep .Nd suspend execution for interval of microseconds .Sh SYNOPSIS .Fd #include <unistd.h> .Ft void .Fn usleep "u_int microseconds" .Sh DESCRIPTION The .Fn usleep function suspends execution of the calling process for .Fa microseconds of time. System activity or time spent in processing the call may lengthen the sleep slightly.
The Regents of the University of California. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this software
must display the following acknowledgement:
This product includes software developed by the University of
California, Berkeley and its contributors.
4. Neither the name of the University nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
@(#)usleep.3 8.1 (Berkeley) 6/4/93
.Dd June 4, 1993 .Dt USLEEP 3 .Os BSD 4.3 .Sh NAME .Nm usleep .Nd suspend execution for interval of microseconds .Sh SYNOPSIS .Fd #include <unistd.h> .Ft void .Fn usleep "u_int microseconds" .Sh DESCRIPTION The .Fn usleep function suspends execution of the calling process for .Fa microseconds of time. System activity or time spent in processing the call may lengthen the sleep slightly.
p If a timer is already running on the process its state is unaltered by this .Fn usleep implementation. If the value .Fa microseconds is more than or equal to the remaining clock time for the running timer, the sleep time is set to the remaining clock time.
p This function is implemented using .Xr signanosleep 2 by pausing for .Fa microseconds of time or until SIGALRM signal occurse (if not blocked). .Sh NOTES
p A microsecond is 0.000001 seconds. .Sh SEE ALSO .Xr alarm 3 , .Xr setitimer 2 , .Xr signal 3 , .Xr signanosleep 2 , .Xr sleep 3 , .Xr ualarm 3 .Sh HISTORY The .Fn usleep function appeared in x 4.3 .