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 * 4. 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 30 #ifndef lint 31 static const char copyright[] = 32 "@(#) Copyright (c) 1989, 1993, 1994\n\ 33 The Regents of the University of California. All rights reserved.\n"; 34 #endif /* not lint */ 35 36 #if 0 37 #ifndef lint 38 static char sccsid[] = "@(#)nice.c 8.2 (Berkeley) 4/16/94"; 39 #endif /* not lint */ 40 #endif 41 42 #include <sys/cdefs.h> 43 __FBSDID("$FreeBSD$"); 44 45 #include <sys/types.h> 46 #include <sys/time.h> 47 #include <sys/resource.h> 48 49 #include <ctype.h> 50 #include <err.h> 51 #include <errno.h> 52 #include <limits.h> 53 #include <stdio.h> 54 #include <stdlib.h> 55 #include <unistd.h> 56 #include <string.h> 57 58 #define DEFNICE 10 59 60 void usage(void); 61 62 int 63 main(int argc, char *argv[]) 64 { 65 long niceness = DEFNICE; 66 int ch; 67 char *ep; 68 69 /* Obsolescent syntax: -number, --number */ 70 if (argc >= 2 && argv[1][0] == '-' && (argv[1][1] == '-' || 71 isdigit((unsigned char)argv[1][1])) && strcmp(argv[1], "--") != 0) 72 if (asprintf(&argv[1], "-n%s", argv[1] + 1) < 0) 73 err(1, "asprintf"); 74 75 while ((ch = getopt(argc, argv, "n:")) != -1) { 76 switch (ch) { 77 case 'n': 78 errno = 0; 79 niceness = strtol(optarg, &ep, 10); 80 if (ep == optarg || *ep != '\0' || errno || 81 niceness < INT_MIN || niceness > INT_MAX) 82 errx(1, "%s: invalid nice value", optarg); 83 break; 84 default: 85 usage(); 86 } 87 } 88 argc -= optind; 89 argv += optind; 90 91 if (argc == 0) 92 usage(); 93 94 errno = 0; 95 niceness += getpriority(PRIO_PROCESS, 0); 96 if (errno) 97 warn("getpriority"); 98 else if (setpriority(PRIO_PROCESS, 0, (int)niceness)) 99 warn("setpriority"); 100 execvp(*argv, argv); 101 err(errno == ENOENT ? 127 : 126, "%s", *argv); 102 } 103 104 void 105 usage(void) 106 { 107 108 (void)fprintf(stderr, 109 "usage: nice [-n increment] utility [argument ...]\n"); 110 exit(1); 111 } 112