NetBSD/usr.bin/renice/renice.c

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/* $NetBSD: renice.c,v 1.6 1998/12/19 21:07:12 christos Exp $ */
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/*
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* Copyright (c) 1983, 1989, 1993
* The Regents of the University of California. All rights reserved.
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*
* 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 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
* 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.
*/
#include <sys/cdefs.h>
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#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1983, 1989, 1993\n\
The Regents of the University of California. All rights reserved.\n");
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#endif /* not lint */
#ifndef lint
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/*static char sccsid[] = "from: @(#)renice.c 8.1 (Berkeley) 6/9/93";*/
__RCSID("$NetBSD: renice.c,v 1.6 1998/12/19 21:07:12 christos Exp $");
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#endif /* not lint */
#include <sys/types.h>
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#include <sys/time.h>
#include <sys/resource.h>
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#include <err.h>
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#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
static int getnum __P((const char *, const char *, int *));
static int donice __P((int, int, int, int));
static void usage __P((void)) __attribute__((__noreturn__));
int main __P((int, char **));
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/*
* Change the priority (nice) of processes
* or groups of processes which are already
* running.
*/
int
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main(argc, argv)
int argc;
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char **argv;
{
int which = PRIO_PROCESS;
int who = 0, prio, errs = 0, incr = 0;
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argc--, argv++;
if (argc < 2)
usage();
if (strcmp(*argv, "-n") == 0) {
incr = 1;
argc--, argv++;
if (argc == 0)
usage();
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}
if (getnum("priority", *argv, &prio))
return 1;
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argc--, argv++;
for (; argc > 0; argc--, argv++) {
if (strcmp(*argv, "-g") == 0) {
which = PRIO_PGRP;
continue;
}
if (strcmp(*argv, "-u") == 0) {
which = PRIO_USER;
continue;
}
if (strcmp(*argv, "-p") == 0) {
which = PRIO_PROCESS;
continue;
}
if (which == PRIO_USER) {
struct passwd *pwd = getpwnam(*argv);
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if (pwd == NULL) {
warnx("%s: unknown user", *argv);
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continue;
}
who = pwd->pw_uid;
} else {
if (getnum("pid", *argv, &who))
continue;
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if (who < 0) {
warnx("%s: bad value", *argv);
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continue;
}
}
errs += donice(which, who, prio, incr);
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}
exit(errs != 0);
}
static int
getnum(com, str, val)
const char *com, *str;
int *val;
{
long v;
char *ep;
v = strtol(str, &ep, NULL);
if (*ep) {
warnx("Bad %s argument: %s", com, str);
return 1;
}
if ((v == LONG_MIN || v == LONG_MAX) && errno == ERANGE) {
warn("Invalid %s argument: %s", com, str);
return 1;
}
*val = (int)v;
return 0;
}
static int
donice(which, who, prio, incr)
int which, who, prio, incr;
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{
int oldprio;
if ((oldprio = getpriority(which, who)) == -1) {
warn("%d: getpriority", who);
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return (1);
}
if (incr)
prio = oldprio + prio;
if (prio > PRIO_MAX)
prio = PRIO_MAX;
if (prio < PRIO_MIN)
prio = PRIO_MIN;
if (setpriority(which, who, prio) == -1) {
warn("%d: setpriority", who);
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return (1);
}
printf("%d: old priority %d, new priority %d\n", who, oldprio, prio);
return (0);
}
static void
usage()
{
extern char *__progname;
(void)fprintf(stderr, "Usage: %s [<priority> | -n <incr>] ",
__progname);
(void)fprintf(stderr, "[[-p] <pids>...] [-g <pgrp>...] ");
(void)fprintf(stderr, "[-u <user>...]\n");
exit(1);
}