1 /* 2 * Copyright (c) 1983, 1989, 1993 3 * The Regents of the University of California. 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 static char copyright[] = 36 "@(#) Copyright (c) 1983, 1989, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 static char sccsid[] = "@(#)renice.c 8.1 (Berkeley) 6/9/93"; 42 #endif /* not lint */ 43 44 #include <sys/types.h> 45 #include <sys/time.h> 46 #include <sys/resource.h> 47 48 #include <stdio.h> 49 #include <pwd.h> 50 51 /* 52 * Change the priority (nice) of processes 53 * or groups of processes which are already 54 * running. 55 */ 56 main(argc, argv) 57 char **argv; 58 { 59 int which = PRIO_PROCESS; 60 int who = 0, prio, errs = 0; 61 62 argc--, argv++; 63 if (argc < 2) { 64 fprintf(stderr, "usage: renice priority [ [ -p ] pids ] "); 65 fprintf(stderr, "[ [ -g ] pgrps ] [ [ -u ] users ]\n"); 66 exit(1); 67 } 68 prio = atoi(*argv); 69 argc--, argv++; 70 if (prio > PRIO_MAX) 71 prio = PRIO_MAX; 72 if (prio < PRIO_MIN) 73 prio = PRIO_MIN; 74 for (; argc > 0; argc--, argv++) { 75 if (strcmp(*argv, "-g") == 0) { 76 which = PRIO_PGRP; 77 continue; 78 } 79 if (strcmp(*argv, "-u") == 0) { 80 which = PRIO_USER; 81 continue; 82 } 83 if (strcmp(*argv, "-p") == 0) { 84 which = PRIO_PROCESS; 85 continue; 86 } 87 if (which == PRIO_USER) { 88 register struct passwd *pwd = getpwnam(*argv); 89 90 if (pwd == NULL) { 91 fprintf(stderr, "renice: %s: unknown user\n", 92 *argv); 93 continue; 94 } 95 who = pwd->pw_uid; 96 } else { 97 who = atoi(*argv); 98 if (who < 0) { 99 fprintf(stderr, "renice: %s: bad value\n", 100 *argv); 101 continue; 102 } 103 } 104 errs += donice(which, who, prio); 105 } 106 exit(errs != 0); 107 } 108 109 donice(which, who, prio) 110 int which, who, prio; 111 { 112 int oldprio; 113 extern int errno; 114 115 errno = 0, oldprio = getpriority(which, who); 116 if (oldprio == -1 && errno) { 117 fprintf(stderr, "renice: %d: ", who); 118 perror("getpriority"); 119 return (1); 120 } 121 if (setpriority(which, who, prio) < 0) { 122 fprintf(stderr, "renice: %d: ", who); 123 perror("setpriority"); 124 return (1); 125 } 126 printf("%d: old priority %d, new priority %d\n", who, oldprio, prio); 127 return (0); 128 } 129