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renice.c revision 1.5 
      1 /*	$NetBSD: renice.c,v 1.5 1997/10/19 14:01:38 lukem 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. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #ifndef lint
     38 __COPYRIGHT("@(#) Copyright (c) 1983, 1989, 1993\n\
     39 	The Regents of the University of California.  All rights reserved.\n");
     40 #endif /* not lint */
     41 
     42 #ifndef lint
     43 /*static char sccsid[] = "from: @(#)renice.c	8.1 (Berkeley) 6/9/93";*/
     44 __RCSID("$NetBSD: renice.c,v 1.5 1997/10/19 14:01:38 lukem Exp $");
     45 #endif /* not lint */
     46 
     47 #include <sys/types.h>
     48 #include <sys/time.h>
     49 #include <sys/resource.h>
     50 
     51 #include <err.h>
     52 #include <pwd.h>
     53 #include <stdio.h>
     54 #include <stdlib.h>
     55 
     56 int	donice __P((int, int, int));
     57 int	main __P((int, char **));
     58 
     59 /*
     60  * Change the priority (nice) of processes
     61  * or groups of processes which are already
     62  * running.
     63  */
     64 int
     65 main(argc, argv)
     66 	int argc;
     67 	char **argv;
     68 {
     69 	int which = PRIO_PROCESS;
     70 	int who = 0, prio, errs = 0;
     71 
     72 	argc--, argv++;
     73 	if (argc < 2) {
     74 		fprintf(stderr, "usage: renice priority [ [ -p ] pids ] ");
     75 		fprintf(stderr, "[ [ -g ] pgrps ] [ [ -u ] users ]\n");
     76 		exit(1);
     77 	}
     78 	prio = atoi(*argv);
     79 	argc--, argv++;
     80 	if (prio > PRIO_MAX)
     81 		prio = PRIO_MAX;
     82 	if (prio < PRIO_MIN)
     83 		prio = PRIO_MIN;
     84 	for (; argc > 0; argc--, argv++) {
     85 		if (strcmp(*argv, "-g") == 0) {
     86 			which = PRIO_PGRP;
     87 			continue;
     88 		}
     89 		if (strcmp(*argv, "-u") == 0) {
     90 			which = PRIO_USER;
     91 			continue;
     92 		}
     93 		if (strcmp(*argv, "-p") == 0) {
     94 			which = PRIO_PROCESS;
     95 			continue;
     96 		}
     97 		if (which == PRIO_USER) {
     98 			register struct passwd *pwd = getpwnam(*argv);
     99 
    100 			if (pwd == NULL) {
    101 				warnx("%s: unknown user", *argv);
    102 				continue;
    103 			}
    104 			who = pwd->pw_uid;
    105 		} else {
    106 			who = atoi(*argv);
    107 			if (who < 0) {
    108 				warnx("%s: bad value", *argv);
    109 				continue;
    110 			}
    111 		}
    112 		errs += donice(which, who, prio);
    113 	}
    114 	exit(errs != 0);
    115 }
    116 
    117 int
    118 donice(which, who, prio)
    119 	int which, who, prio;
    120 {
    121 	int oldprio;
    122 	extern int errno;
    123 
    124 	errno = 0, oldprio = getpriority(which, who);
    125 	if (oldprio == -1 && errno) {
    126 		warn("%d: getpriority", who);
    127 		return (1);
    128 	}
    129 	if (setpriority(which, who, prio) < 0) {
    130 		warn("%d: setpriority", who);
    131 		return (1);
    132 	}
    133 	printf("%d: old priority %d, new priority %d\n", who, oldprio, prio);
    134 	return (0);
    135 }
    136