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-.\" Copyright (c) 1986, 1991, 1993
-.\"	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. 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
-.\" $FreeBSD$
-.\"
-.Dd February 11, 2021
-.Dt USLEEP 3
-.Os
-.Sh NAME
-.Nm usleep
-.Nd suspend thread execution for an interval measured in microseconds
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In unistd.h
-.Ft int
-.Fn usleep "useconds_t microseconds"
-.Sh DESCRIPTION
-The
-.Fn usleep
-function suspends execution of the calling thread until either
-.Fa microseconds
-microseconds have elapsed or a signal is delivered to the thread and its
-action is to invoke a signal-catching function or to terminate the
-process.
-System activity may lengthen the sleep by an indeterminate amount.
-.Pp
-This function is implemented using
-.Xr nanosleep 2
-by pausing for
-.Fa microseconds
-microseconds or until a signal occurs.
-Consequently, in this implementation,
-sleeping has no effect on the state of process timers,
-and there is no special handling for SIGALRM.
-.Sh RETURN VALUES
-.Rv -std usleep
-.Sh ERRORS
-The
-.Fn usleep
-function
-will fail if:
-.Bl -tag -width Er
-.It Bq Er EINTR
-A signal was delivered to the calling thread and its
-action was to invoke a signal-catching function.
-.El
-.Sh SEE ALSO
-.Xr nanosleep 2 ,
-.Xr sleep 3
-.Sh HISTORY
-The
-.Fn usleep
-function appeared in
-.Bx 4.3 .