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. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#) Copyright (c) 1989, 1993, 1994 The Regents of the University of California. All rights reserved. 30 * @(#)nice.c 8.2 (Berkeley) 4/16/94 31 * $FreeBSD: src/usr.bin/nice/nice.c,v 1.4.2.1 2002/06/18 08:40:28 tjr Exp $ 32 * $DragonFly: src/usr.bin/nice/nice.c,v 1.6 2005/10/09 15:09:02 liamfoy Exp $ 33 */ 34 35 #include <sys/time.h> 36 #include <sys/resource.h> 37 38 #include <ctype.h> 39 #include <err.h> 40 #include <errno.h> 41 #include <limits.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <unistd.h> 46 47 #define DEFNICE 10 48 49 static void usage(void); 50 51 int 52 main(int argc, char **argv) 53 { 54 long niceness = DEFNICE; 55 int ch; 56 char *ep; 57 58 /* Obsolescent syntax: -number, --number */ 59 if (argc >= 2 && argv[1][0] == '-' && (argv[1][1] == '-' || 60 isdigit(argv[1][1])) && strcmp(argv[1], "--") != 0) 61 if (asprintf(&argv[1], "-n%s", argv[1] + 1) < 0) 62 err(1, "asprintf"); 63 64 while ((ch = getopt(argc, argv, "n:")) != -1) { 65 switch (ch) { 66 case 'n': 67 errno = 0; 68 niceness = strtol(optarg, &ep, 10); 69 if (ep == optarg || *ep != '\0' || errno || 70 niceness < INT_MIN || niceness > INT_MAX) 71 errx(1, "%s: invalid nice value", optarg); 72 break; 73 default: 74 usage(); 75 } 76 } 77 argc -= optind; 78 argv += optind; 79 80 if (argc == 0) 81 usage(); 82 83 errno = 0; 84 niceness += getpriority(PRIO_PROCESS, 0); 85 if (errno) 86 warn("getpriority"); 87 else if (setpriority(PRIO_PROCESS, 0, (int)niceness)) 88 warn("setpriority"); 89 execvp(*argv, argv); 90 err(errno == ENOENT || errno == ENOTDIR ? 127 : 126, "%s", *argv); 91 } 92 93 static void 94 usage(void) 95 { 96 97 fprintf(stderr, "usage: nice [-n incr] utility [arguments]\n"); 98 exit(1); 99 } 100