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 1.6 2005/10/09 15:09:02 liamfoy Exp $ 37 */ 38 39 #include <sys/time.h> 40 #include <sys/resource.h> 41 42 #include <ctype.h> 43 #include <err.h> 44 #include <errno.h> 45 #include <limits.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 #include <unistd.h> 50 51 #define DEFNICE 10 52 53 static void usage(void); 54 55 int 56 main(int argc, char **argv) 57 { 58 long niceness = DEFNICE; 59 int ch; 60 char *ep; 61 62 /* Obsolescent syntax: -number, --number */ 63 if (argc >= 2 && argv[1][0] == '-' && (argv[1][1] == '-' || 64 isdigit(argv[1][1])) && strcmp(argv[1], "--") != 0) 65 if (asprintf(&argv[1], "-n%s", argv[1] + 1) < 0) 66 err(1, "asprintf"); 67 68 while ((ch = getopt(argc, argv, "n:")) != -1) { 69 switch (ch) { 70 case 'n': 71 errno = 0; 72 niceness = strtol(optarg, &ep, 10); 73 if (ep == optarg || *ep != '\0' || errno || 74 niceness < INT_MIN || niceness > INT_MAX) 75 errx(1, "%s: invalid nice value", optarg); 76 break; 77 default: 78 usage(); 79 } 80 } 81 argc -= optind; 82 argv += optind; 83 84 if (argc == 0) 85 usage(); 86 87 errno = 0; 88 niceness += getpriority(PRIO_PROCESS, 0); 89 if (errno) 90 warn("getpriority"); 91 else if (setpriority(PRIO_PROCESS, 0, (int)niceness)) 92 warn("setpriority"); 93 execvp(*argv, argv); 94 err(errno == ENOENT || errno == ENOTDIR ? 127 : 126, "%s", *argv); 95 } 96 97 static void 98 usage(void) 99 { 100 101 fprintf(stderr, "usage: nice [-n incr] utility [arguments]\n"); 102 exit(1); 103 } 104