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      1 /*	$NetBSD: renice.c,v 1.20 2020/10/23 16:16:10 wiz Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1983, 1989, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 __COPYRIGHT("@(#) Copyright (c) 1983, 1989, 1993\
     35  The Regents of the University of California.  All rights reserved.");
     36 #endif /* not lint */
     37 
     38 #ifndef lint
     39 /*static char sccsid[] = "from: @(#)renice.c	8.1 (Berkeley) 6/9/93";*/
     40 __RCSID("$NetBSD: renice.c,v 1.20 2020/10/23 16:16:10 wiz Exp $");
     41 #endif /* not lint */
     42 
     43 #include <sys/resource.h>
     44 
     45 #include <err.h>
     46 #include <errno.h>
     47 #include <limits.h>
     48 #include <pwd.h>
     49 #include <stdio.h>
     50 #include <stdlib.h>
     51 #include <string.h>
     52 #include <sysexits.h>
     53 
     54 static int	getnum(const char *, const char *, int *);
     55 static int	donice(int, id_t, int, int);
     56 static void	usage(void) __dead;
     57 
     58 /*
     59  * Change the priority (nice) of processes
     60  * or groups of processes which are already
     61  * running.
     62  */
     63 int
     64 main(int argc, char **argv)
     65 {
     66 	int which = PRIO_PROCESS;
     67 	int prio, errs = 0, incr = 0;
     68 	id_t who = 0;
     69 
     70 	argc--, argv++;
     71 	if (argc < 2)
     72 		usage();
     73 	if (strcmp(*argv, "-n") == 0) {
     74 		incr = 1;
     75 		argc--, argv++;
     76 		if (argc < 2)
     77 			usage();
     78 	}
     79 	if (getnum("priority", *argv, &prio))
     80 		return 1;
     81 	argc--, argv++;
     82 	for (; argc > 0; argc--, argv++) {
     83 		if (strcmp(*argv, "-g") == 0) {
     84 			which = PRIO_PGRP;
     85 			continue;
     86 		}
     87 		if (strcmp(*argv, "-u") == 0) {
     88 			which = PRIO_USER;
     89 			continue;
     90 		}
     91 		if (strcmp(*argv, "-p") == 0) {
     92 			which = PRIO_PROCESS;
     93 			continue;
     94 		}
     95 		if (which == PRIO_USER) {
     96 			struct passwd *pwd = getpwnam(*argv);
     97 
     98 			if (pwd == NULL) {
     99 				warnx("%s: unknown user", *argv);
    100 				errs++;
    101 				continue;
    102 			}
    103 			who = (id_t)pwd->pw_uid;
    104 		} else {
    105 			int twho;
    106 			if (getnum("pid", *argv, &twho)) {
    107 				errs++;
    108 				continue;
    109 			}
    110 			if (twho < 0) {
    111 				warnx("%s: bad value", *argv);
    112 				errs++;
    113 				continue;
    114 			}
    115 			who = (id_t)twho;
    116 		}
    117 		errs += donice(which, who, prio, incr);
    118 	}
    119 	return errs == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
    120 }
    121 
    122 static int
    123 getnum(const char *com, const char *str, int *val)
    124 {
    125 	long v;
    126 	char *ep;
    127 
    128 	errno = 0;
    129 	v = strtol(str, &ep, 0);
    130 
    131 	if (*ep) {
    132 		warnx("Bad %s argument: %s", com, str);
    133 		return 1;
    134 	}
    135 	if ((v == LONG_MIN || v == LONG_MAX) && errno == ERANGE) {
    136 		warn("Invalid %s argument: %s", com, str);
    137 		return 1;
    138 	}
    139 
    140 	*val = (int)v;
    141 	return 0;
    142 }
    143 
    144 static int
    145 donice(int which, id_t who, int prio, int incr)
    146 {
    147 	int oldprio;
    148 
    149 	errno = 0;
    150 	if ((oldprio = getpriority(which, who)) == -1 && errno != 0) {
    151 		warn("%d: getpriority", who);
    152 		return 1;
    153 	}
    154 
    155 	if (incr)
    156 		prio = oldprio + prio;
    157 
    158 	if (prio > PRIO_MAX)
    159 		prio = PRIO_MAX;
    160 	if (prio < PRIO_MIN)
    161 		prio = PRIO_MIN;
    162 
    163 	if (setpriority(which, who, prio) == -1) {
    164 		warn("%d: setpriority", who);
    165 		return 1;
    166 	}
    167 	(void)printf("%d: old priority %d, new priority %d\n",
    168 	    who, oldprio, prio);
    169 	return 0;
    170 }
    171 
    172 static void
    173 usage(void)
    174 {
    175 
    176 	(void)fprintf(stderr, "Usage: %s [<priority> | -n <incr>] ",
    177 	    getprogname());
    178 	(void)fprintf(stderr, "[[-gpu] who ...] ...\n");
    179 	exit(1);
    180 }
    181