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+.\" Copyright (c) 1980, 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.
+.\"
+.\"     @(#)nice.3	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd February 28, 2015
+.Dt NICE 3
+.Os
+.Sh NAME
+.Nm nice
+.Nd set program scheduling priority
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In unistd.h
+.Ft int
+.Fn nice "int incr"
+.Sh DESCRIPTION
+.Bf -symbolic
+This interface is obsoleted by
+.Xr setpriority 2 .
+.Ef
+.Pp
+The
+.Fn nice
+function adds
+.Fa incr
+to the scheduling priority of the process.
+The priority is a value in the range -20 to 20.
+The default priority is 0; lower priorities cause more favorable scheduling.
+Only the super-user may lower priorities.
+.Pp
+Children inherit the priority of their parent processes via
+.Xr fork 2 .
+.Sh RETURN VALUES
+Upon successful completion,
+.Fn nice
+returns 0, and
+.Va errno
+is unchanged.
+Otherwise, \-1 is returned, the process' nice value is not changed, and
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+The
+.Fn nice
+function will fail if:
+.Bl -tag -width Er
+.It Bq Er EPERM
+The
+.Fa incr
+argument is negative and the caller does not have appropriate privileges.
+.El
+.Sh SEE ALSO
+.Xr nice 1 ,
+.Xr fork 2 ,
+.Xr setpriority 2 ,
+.Xr renice 8
+.Sh STANDARDS
+The
+.Fn nice
+function conforms to
+.St -p1003.1-2008
+except for the return value.
+This implementation returns 0 upon successful completion but
+the standard requires returning the new nice value,
+which could be \-1.
+.Sh HISTORY
+A
+.Fn nice
+syscall appeared in
+.At v6 .