NetBSD/usr.bin/renice/renice.c

181 lines
4.4 KiB
C

/* $NetBSD: renice.c,v 1.20 2020/10/23 16:16:10 wiz Exp $ */
/*
* Copyright (c) 1983, 1989, 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.
*/
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1983, 1989, 1993\
The Regents of the University of California. All rights reserved.");
#endif /* not lint */
#ifndef lint
/*static char sccsid[] = "from: @(#)renice.c 8.1 (Berkeley) 6/9/93";*/
__RCSID("$NetBSD: renice.c,v 1.20 2020/10/23 16:16:10 wiz Exp $");
#endif /* not lint */
#include <sys/resource.h>
#include <err.h>
#include <errno.h>
#include <limits.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
static int getnum(const char *, const char *, int *);
static int donice(int, id_t, int, int);
static void usage(void) __dead;
/*
* Change the priority (nice) of processes
* or groups of processes which are already
* running.
*/
int
main(int argc, char **argv)
{
int which = PRIO_PROCESS;
int prio, errs = 0, incr = 0;
id_t who = 0;
argc--, argv++;
if (argc < 2)
usage();
if (strcmp(*argv, "-n") == 0) {
incr = 1;
argc--, argv++;
if (argc < 2)
usage();
}
if (getnum("priority", *argv, &prio))
return 1;
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);
if (pwd == NULL) {
warnx("%s: unknown user", *argv);
errs++;
continue;
}
who = (id_t)pwd->pw_uid;
} else {
int twho;
if (getnum("pid", *argv, &twho)) {
errs++;
continue;
}
if (twho < 0) {
warnx("%s: bad value", *argv);
errs++;
continue;
}
who = (id_t)twho;
}
errs += donice(which, who, prio, incr);
}
return errs == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
}
static int
getnum(const char *com, const char *str, int *val)
{
long v;
char *ep;
errno = 0;
v = strtol(str, &ep, 0);
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(int which, id_t who, int prio, int incr)
{
int oldprio;
errno = 0;
if ((oldprio = getpriority(which, who)) == -1 && errno != 0) {
warn("%d: getpriority", who);
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);
return 1;
}
(void)printf("%d: old priority %d, new priority %d\n",
who, oldprio, prio);
return 0;
}
static void
usage(void)
{
(void)fprintf(stderr, "Usage: %s [<priority> | -n <incr>] ",
getprogname());
(void)fprintf(stderr, "[[-gpu] who ...] ...\n");
exit(1);
}