1.\" $OpenBSD: nice.3,v 1.11 2001/05/05 23:12:07 millert Exp $ 2.\" 3.\" Copyright (c) 1980, 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by the University of 17.\" California, Berkeley and its contributors. 18.\" 4. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.Dd June 4, 1993 35.Dt NICE 3 36.Os 37.Sh NAME 38.Nm nice 39.Nd set program scheduling priority 40.Sh SYNOPSIS 41.Fd #include <unistd.h> 42.Ft int 43.Fn nice "int incr" 44.Sh DESCRIPTION 45.Bf -symbolic 46This interface is obsoleted by 47.Xr setpriority 2 . 48.Ef 49.Pp 50The 51.Fn nice 52function obtains the scheduling priority of the process 53from the system and sets it to the priority value specified in 54.Fa incr . 55The priority is a value in the range \-20 to 20. 56The default priority is 0; lower priorities cause more favorable scheduling. 57Only the superuser may lower priorities. 58.Pp 59Children inherit the priority of their parent processes via 60.Xr fork 2 . 61.Sh RETURN VALUES 62.Fn nice 63returns the same values as 64.Xr setpriority 2 . 65.Sh SEE ALSO 66.Xr nice 1 , 67.Xr fork 2 , 68.Xr setpriority 2 , 69.Xr renice 8 70.Sh HISTORY 71A 72.Fn nice 73syscall appeared in 74.At v6 . 75