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renice.c revision 1.4 
      1 /*	$NetBSD: renice.c,v 1.4 1997/01/09 14:39:12 tls 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 #ifndef lint
     37 static char copyright[] =
     38 "@(#) 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 static char rcsid[] = "$NetBSD: renice.c,v 1.4 1997/01/09 14:39:12 tls Exp $";
     45 #endif /* not lint */
     46 
     47 #include <sys/types.h>
     48 #include <sys/time.h>
     49 #include <sys/resource.h>
     50 
     51 #include <stdio.h>
     52 #include <pwd.h>
     53 
     54 /*
     55  * Change the priority (nice) of processes
     56  * or groups of processes which are already
     57  * running.
     58  */
     59 main(argc, argv)
     60 	char **argv;
     61 {
     62 	int which = PRIO_PROCESS;
     63 	int who = 0, prio, errs = 0;
     64 
     65 	argc--, argv++;
     66 	if (argc < 2) {
     67 		fprintf(stderr, "usage: renice priority [ [ -p ] pids ] ");
     68 		fprintf(stderr, "[ [ -g ] pgrps ] [ [ -u ] users ]\n");
     69 		exit(1);
     70 	}
     71 	prio = atoi(*argv);
     72 	argc--, argv++;
     73 	if (prio > PRIO_MAX)
     74 		prio = PRIO_MAX;
     75 	if (prio < PRIO_MIN)
     76 		prio = PRIO_MIN;
     77 	for (; argc > 0; argc--, argv++) {
     78 		if (strcmp(*argv, "-g") == 0) {
     79 			which = PRIO_PGRP;
     80 			continue;
     81 		}
     82 		if (strcmp(*argv, "-u") == 0) {
     83 			which = PRIO_USER;
     84 			continue;
     85 		}
     86 		if (strcmp(*argv, "-p") == 0) {
     87 			which = PRIO_PROCESS;
     88 			continue;
     89 		}
     90 		if (which == PRIO_USER) {
     91 			register struct passwd *pwd = getpwnam(*argv);
     92 
     93 			if (pwd == NULL) {
     94 				fprintf(stderr, "renice: %s: unknown user\n",
     95 					*argv);
     96 				continue;
     97 			}
     98 			who = pwd->pw_uid;
     99 		} else {
    100 			who = atoi(*argv);
    101 			if (who < 0) {
    102 				fprintf(stderr, "renice: %s: bad value\n",
    103 					*argv);
    104 				continue;
    105 			}
    106 		}
    107 		errs += donice(which, who, prio);
    108 	}
    109 	exit(errs != 0);
    110 }
    111 
    112 donice(which, who, prio)
    113 	int which, who, prio;
    114 {
    115 	int oldprio;
    116 	extern int errno;
    117 
    118 	errno = 0, oldprio = getpriority(which, who);
    119 	if (oldprio == -1 && errno) {
    120 		fprintf(stderr, "renice: %d: ", who);
    121 		perror("getpriority");
    122 		return (1);
    123 	}
    124 	if (setpriority(which, who, prio) < 0) {
    125 		fprintf(stderr, "renice: %d: ", who);
    126 		perror("setpriority");
    127 		return (1);
    128 	}
    129 	printf("%d: old priority %d, new priority %d\n", who, oldprio, prio);
    130 	return (0);
    131 }
    132