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 #ifndef lint 40 static char sccsid[] = "@(#)nice.c 8.2 (Berkeley) 4/16/94"; 41 #endif /* not lint */ 42 #endif 43 44 #include <sys/cdefs.h> 45 __FBSDID("$FreeBSD$"); 46 47 #include <sys/types.h> 48 #include <sys/time.h> 49 #include <sys/resource.h> 50 51 #include <ctype.h> 52 #include <err.h> 53 #include <errno.h> 54 #include <limits.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <unistd.h> 58 #include <string.h> 59 60 #define DEFNICE 10 61 62 void usage(void); 63 64 int 65 main(int argc, char *argv[]) 66 { 67 long niceness = DEFNICE; 68 int ch; 69 char *ep; 70 71 /* Obsolescent syntax: -number, --number */ 72 if (argc >= 2 && argv[1][0] == '-' && (argv[1][1] == '-' || 73 isdigit((unsigned char)argv[1][1])) && strcmp(argv[1], "--") != 0) 74 if (asprintf(&argv[1], "-n%s", argv[1] + 1) < 0) 75 err(1, "asprintf"); 76 77 while ((ch = getopt(argc, argv, "n:")) != -1) { 78 switch (ch) { 79 case 'n': 80 errno = 0; 81 niceness = strtol(optarg, &ep, 10); 82 if (ep == optarg || *ep != '\0' || errno || 83 niceness < INT_MIN || niceness > INT_MAX) 84 errx(1, "%s: invalid nice value", optarg); 85 break; 86 default: 87 usage(); 88 } 89 } 90 argc -= optind; 91 argv += optind; 92 93 if (argc == 0) 94 usage(); 95 96 errno = 0; 97 niceness += getpriority(PRIO_PROCESS, 0); 98 if (errno) 99 warn("getpriority"); 100 else if (setpriority(PRIO_PROCESS, 0, (int)niceness)) 101 warn("setpriority"); 102 execvp(*argv, argv); 103 err(errno == ENOENT ? 127 : 126, "%s", *argv); 104 } 105 106 void 107 usage(void) 108 { 109 110 (void)fprintf(stderr, 111 "usage: nice [-n increment] utility [argument ...]\n"); 112 exit(1); 113 } 114