1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1989, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/types.h> 33 #include <sys/time.h> 34 #include <sys/resource.h> 35 36 #include <ctype.h> 37 #include <err.h> 38 #include <errno.h> 39 #include <limits.h> 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <unistd.h> 43 #include <string.h> 44 45 #define DEFNICE 10 46 47 void usage(void); 48 49 int 50 main(int argc, char *argv[]) 51 { 52 long niceness = DEFNICE; 53 int ch; 54 char *ep; 55 56 /* Obsolescent syntax: -number, --number */ 57 if (argc >= 2 && argv[1][0] == '-' && (argv[1][1] == '-' || 58 isdigit((unsigned char)argv[1][1])) && strcmp(argv[1], "--") != 0) 59 if (asprintf(&argv[1], "-n%s", argv[1] + 1) < 0) 60 err(1, "asprintf"); 61 62 while ((ch = getopt(argc, argv, "n:")) != -1) { 63 switch (ch) { 64 case 'n': 65 errno = 0; 66 niceness = strtol(optarg, &ep, 10); 67 if (ep == optarg || *ep != '\0' || errno || 68 niceness < INT_MIN || niceness > INT_MAX) 69 errx(1, "%s: invalid nice value", optarg); 70 break; 71 default: 72 usage(); 73 } 74 } 75 argc -= optind; 76 argv += optind; 77 78 if (argc == 0) 79 usage(); 80 81 errno = 0; 82 niceness += getpriority(PRIO_PROCESS, 0); 83 if (errno) 84 warn("getpriority"); 85 else if (setpriority(PRIO_PROCESS, 0, (int)niceness)) 86 warn("setpriority"); 87 execvp(*argv, argv); 88 err(errno == ENOENT ? 127 : 126, "%s", *argv); 89 } 90 91 void 92 usage(void) 93 { 94 95 (void)fprintf(stderr, 96 "usage: nice [-n increment] utility [argument ...]\n"); 97 exit(1); 98 } 99