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-.\" Copyright (c) 1980, 1991, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
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-.\" modification, are permitted provided that the following conditions
-.\" are met:
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-.\" 2. Redistributions in binary form must reproduce the above copyright
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-.\" 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
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-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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-.\" SUCH DAMAGE.
-.\"
-.\"     @(#)getpriority.2	8.1 (Berkeley) 6/4/93
-.\"
-.Dd June 4, 1993
-.Dt GETPRIORITY 2
-.Os BSD 4
-.Sh NAME
-.Nm getpriority ,
-.Nm setpriority
-.Nd get/set program scheduling priority
-.Sh SYNOPSIS
-.Fd #include <sys/time.h>
-.Fd #include <sys/resource.h>
-.Ft int
-.Fn getpriority "int which" "int who"
-.Ft int
-.Fn setpriority "int which" "int who" "int prio"
-.Sh DESCRIPTION
-The scheduling
-priority of the process, process group, or user, as indicated by
-.Fa which
-and
-.Fa who
-is obtained with the
-.Fn getpriority
-call and set with the
-.Fn setpriority
-call.
-.Fa Which
-is one of
-.Dv PRIO_PROCESS ,
-.Dv PRIO_PGRP ,
-or
-.Dv PRIO_USER ,
-and 
-.Fa who
-is interpreted relative to 
-.Fa which
-(a process identifier for
-.Dv PRIO_PROCESS ,
-process group
-identifier for
-.Dv PRIO_PGRP ,
-and a user ID for
-.Dv PRIO_USER ) .
-A zero value of
-.Fa who
-denotes the current process, process group, or user.
-.Fa Prio
-is a value in the range -20 to 20.  The default priority is 0;
-lower priorities cause more favorable scheduling.
-.Pp
-The
-.Fn getpriority
-call returns the highest priority (lowest numerical value)
-enjoyed by any of the specified processes.  The
-.Fn setpriority
-call sets the priorities of all of the specified processes
-to the specified value.  Only the super-user may lower priorities.
-.Sh RETURN VALUES
-Since
-.Fn getpriority
-can legitimately return the value -1, it is necessary
-to clear the external variable
-.Va errno
-prior to the
-call, then check it afterward to determine
-if a -1 is an error or a legitimate value.
-The
-.Fn setpriority
-call returns 0 if there is no error, or
--1 if there is.
-.Sh ERRORS
-.Fn Getpriority
-and
-.Fn setpriority
-will fail if:
-.Bl -tag -width Er
-.It Bq Er ESRCH
-No process was located using the 
-.Fa which
-and
-.Fa who
-values specified.
-.It Bq Er EINVAL
-.Fa Which
-was not one of
-.Dv PRIO_PROCESS ,
-.Dv PRIO_PGRP ,
-or
-.Dv PRIO_USER .
-.El
-.Pp
-.Bl -tag -width Er
-In addition to the errors indicated above,
-.Fn setpriority
-will fail if:
-.It Bq Er EPERM
-A process was located, but neither its effective nor real user
-ID matched the effective user ID of the caller.
-.It Bq Er EACCES
-A non super-user attempted to lower a process priority.
-.El
-.Sh SEE ALSO
-.Xr nice 1 ,
-.Xr fork 2 ,
-.Xr renice 8
-.Sh HISTORY
-The
-.Fn getpriority
-function call appeared in
-.Bx 4.2 .