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authorpeter <peter@FreeBSD.org>1995-12-30 19:02:48 +0000
committerpeter <peter@FreeBSD.org>1995-12-30 19:02:48 +0000
commitab124e78b0271ddb904b761b31e5c9a0cf24e070 (patch)
tree0cf1447720c45721ed3d214a4eaaa6834bda155d /usr.sbin/rtprio
parent15748830d0fcd29294a1969a1012655e74908c1e (diff)
downloadFreeBSD-src-ab124e78b0271ddb904b761b31e5c9a0cf24e070.zip
FreeBSD-src-ab124e78b0271ddb904b761b31e5c9a0cf24e070.tar.gz
recording cvs-1.6 file death
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-.\" Copyright (c) 1994, Henrik Vestergaard Draboel
-.\" 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. All advertising materials mentioning features or use of this software
-.\" must display the following acknowledgement:
-.\" This product includes software developed by Henrik Vestergaard Draboel.
-.\" 4. The name of the author may not be used to endorse or promote products
-.\" derived from this software without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
-.\"
-.\" $Id: rtprio.2,v 1.2 1994/09/01 12:09:17 davidg Exp $
-.\"
-.Dd July 23, 1994
-.Dt RTPRIO 2
-.Sh NAME
-.Nm rtprio
-.Nd examine or modify a process realtime or idle priority
-.Sh SYNOPSIS
-.Fd #include <sys/resource.h>
-.Fd #include <sys/rtprio.h>
-.Ft int
-.Fn rtprio "function" "pid_t pid" "struct rtprio *rtp"
-.Sh DESCRIPTION
-.Fn rtprio
-is used to lookup or change the realtime or idle priority of a process.
-
-.Fa function
-specifies the operation to be performed. RTP_LOOKUP to lookup the current priority,
-and RTP_SET to set the priority.
-.Fa pid
-specifies the process to be used, 0 for the current process.
-
-.Fa *rtp
-is a pointer to a struct rtprio which is used to specify the priority and priority type.
-This structure has the following form:
-.Bd -literal
-struct rtprio {
- u_short type;
- u_short prio;
-};
-.Ed
-.Pp
-The value of the
-.Nm type
-field may be RTP_PRIO_REALTIME for realtime priorities,
-RTP_PRIO_NORMAL for normal priorities, and RTP_PRIO_IDLE for idle priorities.
-The priority specified by the
-.Nm prio
-field ranges between 0 and
-.Dv RTP_PRIO_MAX (usually 31) .
-0 is the highest possible priority.
-
-Realtime and idle priority is inherited through fork() and exec().
-
-A realtime process can only be preempted by a process of equal or
-higher priority, or by an interrupt; idle priority processes will run only
-when no other real/normal priority process is runnable. Higher real/idle priority processes
-preempt lower real/idle priority processes. Processes of equal real/idle priority are run round-robin.
-.Sh RETURN VALUES
-.Fn rtprio
-will return 0 for success and -1 for all errors. The global variable
-.Va errno
-will be set to indicate the error.
-.Sh ERRORS
-.Fn rtprio
-will fail if
-.Bl -tag -width Er
-.It Bq Er EINVAL
-The specified
-.Fa prio
-was out of range.
-.It Bq Er EPERM
-The calling process is not allowed to set the realtime priority. Only
-root is allowed to change the realtime priority of any process, and non-root
-may only change the idle priority of the current process.
-.It Bq Er ESRCH
-The specified process was not found.
-.Sh AUTHOR
-The original author was Henrik Vestergaard Draboel - hvd@terry.ping.dk. This
-implementation in FreeBSD was substantially rewritten by David Greenman.
-.Sh SEE ALSO
-.Xr rtprio 1 ,
-.Xr nice 1 ,
-.Xr ps 1 ,
-.Xr nice 2 ,
-.Xr renice 8
-
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