1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 23 /* All Rights Reserved */ 24 25 26 /* 27 * Copyright 2000-2003 Sun Microsystems, Inc. All rights reserved. 28 * Use is subject to license terms. 29 */ 30 31 /* 32 ** nice 33 */ 34 35 36 #include <stdio.h> 37 #include <locale.h> 38 #include <stdlib.h> 39 #include <string.h> 40 #include <unistd.h> 41 #include <errno.h> 42 43 44 static void usage(void); 45 46 int 47 main(int argc, char *argv[]) 48 { 49 long nicarg = 10; 50 51 (void) setlocale(LC_ALL, ""); 52 #if !defined(TEXT_DOMAIN) 53 #define TEXT_DOMAIN "SYS_TEST" 54 #endif 55 (void) textdomain(TEXT_DOMAIN); 56 57 58 if (argc < 2) 59 usage(); 60 61 62 if (argv[1][0] == '-') { 63 if (strcmp(argv[1], "--") == 0) { 64 argv++; 65 argc--; 66 } else { 67 register char *p = argv[1]; 68 char *nicarg_str; 69 char *end_ptr; 70 71 if (*++p == 'n') { /* -n55 new form, XCU4 */ 72 /* 73 * for situations like -n-10 74 * else case assigns p instead of argv 75 */ 76 if (!(*++p)) { 77 /* Next arg is priority */ 78 argv++; 79 argc--; 80 if (argc < 2) 81 usage(); 82 nicarg_str = argv[1]; 83 } else { 84 /* Priority embedded eg. -n-10 */ 85 nicarg_str = p; 86 } 87 } else { /* -55 obs form, XCU4 */ 88 nicarg_str = &argv[1][1]; 89 } 90 nicarg = strtol(nicarg_str, &end_ptr, 10); 91 if (*end_ptr) { 92 (void) fprintf(stderr, 93 gettext("nice: argument must be numeric.\n")); 94 usage(); 95 } 96 97 if( --argc < 2 ) 98 usage(); 99 100 argv++; 101 if (strcmp(argv[1], "--") == 0) { 102 argv++; 103 argc--; 104 } 105 } 106 } 107 108 if (argc < 2) 109 usage(); 110 111 errno = 0; 112 if (nice(nicarg) == -1) { 113 /* 114 * Could be an error or a legitimate return value. 115 * The only error we care about is EINVAL, which will 116 * be returned by the scheduling class we are in if 117 * nice is invalid for this class. 118 * For any error other than EINVAL 119 * we will go ahead and exec the command even though 120 * the priority change failed. 121 */ 122 if (errno == EINVAL) { 123 (void) fprintf(stderr, gettext( 124 "nice: invalid operation; " 125 "scheduling class does not support nice\n")); 126 return (2); 127 } 128 } 129 (void) execvp(argv[1], &argv[1]); 130 (void) fprintf(stderr, gettext("%s: %s\n"), strerror(errno), argv[1]); 131 /* 132 * POSIX.2 exit status: 133 * 127 if utility is not found. 134 * 126 if utility cannot be invoked. 135 */ 136 return (errno == ENOENT || errno == ENOTDIR ? 127 : 126); 137 } 138 139 static void 140 usage() 141 { 142 (void) fprintf(stderr, 143 gettext("nice: usage: nice [-n increment] utility [argument ...]\n")); 144 exit(2); 145 } 146