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 34 #ifndef lint 35 static const char copyright[] = 36 "@(#) Copyright (c) 1989, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #if 0 41 #ifndef lint 42 static char sccsid[] = "@(#)nice.c 8.2 (Berkeley) 4/16/94"; 43 #endif /* not lint */ 44 #endif 45 46 #include <sys/cdefs.h> 47 __FBSDID("$FreeBSD$"); 48 49 #include <sys/types.h> 50 #include <sys/time.h> 51 #include <sys/resource.h> 52 53 #include <ctype.h> 54 #include <err.h> 55 #include <errno.h> 56 #include <limits.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <unistd.h> 60 #include <string.h> 61 62 #define DEFNICE 10 63 64 void usage(void); 65 66 int 67 main(int argc, char *argv[]) 68 { 69 long niceness = DEFNICE; 70 int ch; 71 char *ep; 72 73 /* Obsolescent syntax: -number, --number */ 74 if (argc >= 2 && argv[1][0] == '-' && (argv[1][1] == '-' || 75 isdigit((unsigned char)argv[1][1])) && strcmp(argv[1], "--") != 0) 76 if (asprintf(&argv[1], "-n%s", argv[1] + 1) < 0) 77 err(1, "asprintf"); 78 79 while ((ch = getopt(argc, argv, "n:")) != -1) { 80 switch (ch) { 81 case 'n': 82 errno = 0; 83 niceness = strtol(optarg, &ep, 10); 84 if (ep == optarg || *ep != '\0' || errno || 85 niceness < INT_MIN || niceness > INT_MAX) 86 errx(1, "%s: invalid nice value", optarg); 87 break; 88 default: 89 usage(); 90 } 91 } 92 argc -= optind; 93 argv += optind; 94 95 if (argc == 0) 96 usage(); 97 98 errno = 0; 99 niceness += getpriority(PRIO_PROCESS, 0); 100 if (errno) 101 warn("getpriority"); 102 else if (setpriority(PRIO_PROCESS, 0, (int)niceness)) 103 warn("setpriority"); 104 execvp(*argv, argv); 105 err(errno == ENOENT ? 127 : 126, "%s", *argv); 106 } 107 108 void 109 usage(void) 110 { 111 112 (void)fprintf(stderr, "usage: nice [-n incr] utility [arguments]\n"); 113 exit(1); 114 } 115