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renice.c revision 1.2 
      1 /*
      2  * Copyright (c) 1983 The Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #ifndef lint
     35 char copyright[] =
     36 "@(#) Copyright (c) 1989 The Regents of the University of California.\n\
     37  All rights reserved.\n";
     38 #endif /* not lint */
     39 
     40 #ifndef lint
     41 /*static char sccsid[] = "from: @(#)renice.c	5.3 (Berkeley) 6/1/90";*/
     42 static char rcsid[] = "$Id: renice.c,v 1.2 1993/08/01 18:09:34 mycroft Exp $";
     43 #endif /* not lint */
     44 
     45 #include <sys/time.h>
     46 #include <sys/resource.h>
     47 #include <stdio.h>
     48 #include <pwd.h>
     49 
     50 /*
     51  * Change the priority (nice) of processes
     52  * or groups of processes which are already
     53  * running.
     54  */
     55 main(argc, argv)
     56 	char **argv;
     57 {
     58 	int which = PRIO_PROCESS;
     59 	int who = 0, prio, errs = 0;
     60 
     61 	argc--, argv++;
     62 	if (argc < 2) {
     63 		fprintf(stderr, "usage: renice priority [ [ -p ] pids ] ");
     64 		fprintf(stderr, "[ [ -g ] pgrps ] [ [ -u ] users ]\n");
     65 		exit(1);
     66 	}
     67 	prio = atoi(*argv);
     68 	argc--, argv++;
     69 	if (prio > PRIO_MAX)
     70 		prio = PRIO_MAX;
     71 	if (prio < PRIO_MIN)
     72 		prio = PRIO_MIN;
     73 	for (; argc > 0; argc--, argv++) {
     74 		if (strcmp(*argv, "-g") == 0) {
     75 			which = PRIO_PGRP;
     76 			continue;
     77 		}
     78 		if (strcmp(*argv, "-u") == 0) {
     79 			which = PRIO_USER;
     80 			continue;
     81 		}
     82 		if (strcmp(*argv, "-p") == 0) {
     83 			which = PRIO_PROCESS;
     84 			continue;
     85 		}
     86 		if (which == PRIO_USER) {
     87 			register struct passwd *pwd = getpwnam(*argv);
     88 
     89 			if (pwd == NULL) {
     90 				fprintf(stderr, "renice: %s: unknown user\n",
     91 					*argv);
     92 				continue;
     93 			}
     94 			who = pwd->pw_uid;
     95 		} else {
     96 			who = atoi(*argv);
     97 			if (who < 0) {
     98 				fprintf(stderr, "renice: %s: bad value\n",
     99 					*argv);
    100 				continue;
    101 			}
    102 		}
    103 		errs += donice(which, who, prio);
    104 	}
    105 	exit(errs != 0);
    106 }
    107 
    108 donice(which, who, prio)
    109 	int which, who, prio;
    110 {
    111 	int oldprio;
    112 	extern int errno;
    113 
    114 	errno = 0, oldprio = getpriority(which, who);
    115 	if (oldprio == -1 && errno) {
    116 		fprintf(stderr, "renice: %d: ", who);
    117 		perror("getpriority");
    118 		return (1);
    119 	}
    120 	if (setpriority(which, who, prio) < 0) {
    121 		fprintf(stderr, "renice: %d: ", who);
    122 		perror("setpriority");
    123 		return (1);
    124 	}
    125 	printf("%d: old priority %d, new priority %d\n", who, oldprio, prio);
    126 	return (0);
    127 }
    128