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 #ifndef lint 33 static const char copyright[] = 34 "@(#) Copyright (c) 1989, 1993, 1994\n\ 35 The Regents of the University of California. All rights reserved.\n"; 36 #endif /* not lint */ 37 38 #if 0 39 #endif 40 41 #include <sys/cdefs.h> 42 #include <sys/types.h> 43 #include <sys/time.h> 44 #include <sys/resource.h> 45 46 #include <ctype.h> 47 #include <err.h> 48 #include <errno.h> 49 #include <limits.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <unistd.h> 53 #include <string.h> 54 55 #define DEFNICE 10 56 57 void usage(void); 58 59 int 60 main(int argc, char *argv[]) 61 { 62 long niceness = DEFNICE; 63 int ch; 64 char *ep; 65 66 /* Obsolescent syntax: -number, --number */ 67 if (argc >= 2 && argv[1][0] == '-' && (argv[1][1] == '-' || 68 isdigit((unsigned char)argv[1][1])) && strcmp(argv[1], "--") != 0) 69 if (asprintf(&argv[1], "-n%s", argv[1] + 1) < 0) 70 err(1, "asprintf"); 71 72 while ((ch = getopt(argc, argv, "n:")) != -1) { 73 switch (ch) { 74 case 'n': 75 errno = 0; 76 niceness = strtol(optarg, &ep, 10); 77 if (ep == optarg || *ep != '\0' || errno || 78 niceness < INT_MIN || niceness > INT_MAX) 79 errx(1, "%s: invalid nice value", optarg); 80 break; 81 default: 82 usage(); 83 } 84 } 85 argc -= optind; 86 argv += optind; 87 88 if (argc == 0) 89 usage(); 90 91 errno = 0; 92 niceness += getpriority(PRIO_PROCESS, 0); 93 if (errno) 94 warn("getpriority"); 95 else if (setpriority(PRIO_PROCESS, 0, (int)niceness)) 96 warn("setpriority"); 97 execvp(*argv, argv); 98 err(errno == ENOENT ? 127 : 126, "%s", *argv); 99 } 100 101 void 102 usage(void) 103 { 104 105 (void)fprintf(stderr, 106 "usage: nice [-n increment] utility [argument ...]\n"); 107 exit(1); 108 } 109