1 /* 2 * Copyright (c) 1989, 1993, 1994 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 * @(#) Copyright (c) 1989, 1993, 1994 The Regents of the University of California. All rights reserved. 34 * @(#)nice.c 8.2 (Berkeley) 4/16/94 35 * $FreeBSD: src/usr.bin/nice/nice.c,v 1.4.2.1 2002/06/18 08:40:28 tjr Exp $ 36 * $DragonFly: src/usr.bin/nice/nice.c,v 1.3 2003/10/04 20:36:49 hmp Exp $ 37 */ 38 39 #include <sys/types.h> 40 #include <sys/time.h> 41 #include <sys/resource.h> 42 43 #include <ctype.h> 44 #include <err.h> 45 #include <errno.h> 46 #include <limits.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <unistd.h> 50 #include <string.h> 51 52 #define DEFNICE 10 53 54 void usage(void); 55 56 int 57 main(int argc, char **argv) 58 { 59 long niceness = DEFNICE; 60 int ch; 61 char *ep; 62 63 /* Obsolescent syntax: -number, --number */ 64 if (argc >= 2 && argv[1][0] == '-' && (argv[1][1] == '-' || 65 isdigit((unsigned char)argv[1][1])) && strcmp(argv[1], "--") != 0) 66 if (asprintf(&argv[1], "-n%s", argv[1] + 1) < 0) 67 err(1, "asprintf"); 68 69 while ((ch = getopt(argc, argv, "n:")) != -1) { 70 switch (ch) { 71 case 'n': 72 errno = 0; 73 niceness = strtol(optarg, &ep, 10); 74 if (ep == optarg || *ep != '\0' || errno || 75 niceness < INT_MIN || niceness > INT_MAX) 76 errx(1, "%s: invalid nice value", optarg); 77 break; 78 default: 79 usage(); 80 } 81 } 82 argc -= optind; 83 argv += optind; 84 85 if (argc == 0) 86 usage(); 87 88 errno = 0; 89 niceness += getpriority(PRIO_PROCESS, 0); 90 if (errno) 91 warn("getpriority"); 92 else if (setpriority(PRIO_PROCESS, 0, (int)niceness)) 93 warn("setpriority"); 94 execvp(*argv, argv); 95 err(errno == ENOENT ? 127 : 126, "%s", *argv); 96 } 97 98 void 99 usage(void) 100 { 101 102 (void)fprintf(stderr, "usage: nice [-n incr] utility [arguments]\n"); 103 exit(1); 104 } 105