/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* 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.
*/
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1983, 1989, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#if 0
#ifndef lint
static char sccsid[] = "@(#)renice.c 8.1 (Berkeley) 6/9/93";
#endif /* not lint */
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <err.h>
#include <errno.h>
#include <limits.h>
#include <pwd.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static int donice(int, int, int, bool);
static int getnum(const char *, const char *, int *);
static void usage(void);
/*
* Change the priority (nice) of processes
* or groups of processes which are already
* running.
*/
int
main(int argc, char *argv[])
{
struct passwd *pwd;
bool havedelim = false, haveprio = false, incr = false;
int errs = 0, prio = 0, who = 0, which = PRIO_PROCESS;
for (argc--, argv++; argc > 0; argc--, argv++) {
if (!havedelim) {
/* can occur at any time prior to delimiter */
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 (strcmp(*argv, "--") == 0) {
havedelim = true;
continue;
}
if (strcmp(*argv, "-n") == 0) {
/* may occur only once, prior to priority */
if (haveprio || incr)
usage();
incr = true;
(void)argc--, argv++;
/* fall through to priority */
}
}
if (!haveprio) {
/* must occur exactly once, prior to target */
if (getnum("priority", *argv, &prio))
return (1);
haveprio = true;
continue;
}
if (which == PRIO_USER) {
if ((pwd = getpwnam(*argv)) != NULL)
who = pwd->pw_uid;
else if (getnum("uid", *argv, &who)) {
errs++;
continue;
} else if (who < 0) {
warnx("%s: bad value", *argv);
errs++;
continue;
}
} else {
if (getnum("pid", *argv, &who)) {
errs++;
continue;
}
if (who < 0) {
warnx("%s: bad value", *argv);
errs++;
continue;
}
}
errs += donice(which, who, prio, incr);
}
if (!haveprio)
usage();
exit(errs != 0);
}
static int
donice(int which, int who, int prio, bool incr)
{
int oldprio;
errno = 0;
oldprio = getpriority(which, who);
if (oldprio == -1 && errno) {
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) < 0) {
warn("%d: setpriority", who);
return (1);
}
fprintf(stderr, "%d: old priority %d, new priority %d\n", who,
oldprio, prio);
return (0);
}
static int
getnum(const char *com, const char *str, int *val)
{
long v;
char *ep;
errno = 0;
v = strtol(str, &ep, 10);
if (v < INT_MIN || v > INT_MAX || errno == ERANGE) {
warnx("%s argument %s is out of range.", com, str);
return (1);
}
if (ep == str || *ep != '\0' || errno != 0) {
warnx("%s argument %s is invalid.", com, str);
return (1);
}
*val = (int)v;
return (0);
}
static void
usage(void)
{
fprintf(stderr, "%s\n%s\n",
"usage: renice priority [[-p] pid ...] [[-g] pgrp ...] [[-u] user ...]",
" renice -n increment [[-p] pid ...] [[-g] pgrp ...] [[-u] user ...]");
exit(1);
}
