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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
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+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
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+.\"    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.
+.\"
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+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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+.\"
+.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 .