1 /* 2 * Copyright 2000 Massachusetts Institute of Technology 3 * 4 * Permission to use, copy, modify, and distribute this software and 5 * its documentation for any purpose and without fee is hereby 6 * granted, provided that both the above copyright notice and this 7 * permission notice appear in all copies, that both the above 8 * copyright notice and this permission notice appear in all 9 * supporting documentation, and that the name of M.I.T. not be used 10 * in advertising or publicity pertaining to distribution of the 11 * software without specific, written prior permission. M.I.T. makes 12 * no representations about the suitability of this software for any 13 * purpose. It is provided "as is" without express or implied 14 * warranty. 15 * 16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD: src/usr.bin/getconf/getconf.c,v 1.6.2.1 2002/10/27 04:18:40 wollman Exp $ 30 * $DragonFly: src/usr.bin/getconf/getconf.c,v 1.4 2006/12/06 11:58:57 tgen Exp $ 31 */ 32 33 #include <sys/types.h> 34 35 #include <err.h> 36 #include <errno.h> 37 #include <stdio.h> 38 #include <stdlib.h> 39 #include <sysexits.h> 40 #include <unistd.h> 41 42 #include "getconf.h" 43 44 static void do_confstr(const char *name, int key); 45 static void do_sysconf(const char *name, int key); 46 static void do_pathconf(const char *name, int key, const char *path); 47 48 static void 49 usage(void) 50 { 51 fprintf(stderr, "usage:\n" 52 "\tgetconf [-v prog_env] system_var\n" 53 "\tgetconf [-v prog_env] path_var pathname\n"); 54 exit(EX_USAGE); 55 } 56 57 int 58 main(int argc, char **argv) 59 { 60 int c, key, valid; 61 const char *name, *vflag, *alt_path; 62 gc_intmax_t limitval; 63 64 vflag = NULL; 65 while ((c = getopt(argc, argv, "v:")) != -1) { 66 switch (c) { 67 case 'v': 68 vflag = optarg; 69 break; 70 71 default: 72 usage(); 73 } 74 } 75 76 if ((name = argv[optind]) == NULL) 77 usage(); 78 79 if (vflag != NULL) { 80 if ((valid = find_progenv(vflag, &alt_path)) == 0) 81 errx(EX_USAGE, "invalid programming environment %s", 82 vflag); 83 if (valid > 0 && alt_path != NULL) { 84 if (argv[optind + 1] == NULL) 85 execl(alt_path, "getconf", argv[optind], 86 NULL); 87 else 88 execl(alt_path, "getconf", argv[optind], 89 argv[optind + 1], NULL); 90 91 err(EX_OSERR, "execl: %s", alt_path); 92 } 93 if (valid < 0) 94 errx(EX_UNAVAILABLE, "environment %s is not available", 95 vflag); 96 } 97 98 if (argv[optind + 1] == NULL) { /* confstr or sysconf */ 99 if ((valid = find_limit(name, &limitval)) != 0) { 100 if (valid > 0) 101 printf("%" GC_PRIdMAX "\n", limitval); 102 else 103 printf("undefined\n"); 104 105 return 0; 106 } 107 if ((valid = find_confstr(name, &key)) != 0) { 108 if (valid > 0) 109 do_confstr(name, key); 110 else 111 printf("undefined\n"); 112 } else { 113 valid = find_sysconf(name, &key); 114 if (valid > 0) { 115 do_sysconf(name, key); 116 } else if (valid < 0) { 117 printf("undefined\n"); 118 } else 119 errx(EX_USAGE, 120 "no such configuration parameter `%s'", 121 name); 122 } 123 } else { 124 valid = find_pathconf(name, &key); 125 if (valid != 0) { 126 if (valid > 0) 127 do_pathconf(name, key, argv[optind + 1]); 128 else 129 printf("undefined\n"); 130 } else 131 errx(EX_USAGE, 132 "no such path configuration parameter `%s'", 133 name); 134 } 135 return 0; 136 } 137 138 static void 139 do_confstr(const char *name, int key) 140 { 141 char *buf; 142 size_t len; 143 144 errno = 0; 145 len = confstr(key, 0, 0); 146 if (len == 0 && errno != 0) 147 err(EX_OSERR, "confstr: %s", name); 148 149 if (len == 0) { 150 printf("undefined\n"); 151 } else { 152 buf = alloca(len); 153 confstr(key, buf, len); 154 printf("%s\n", buf); 155 } 156 } 157 158 static void 159 do_sysconf(const char *name, int key) 160 { 161 long value; 162 163 errno = 0; 164 value = sysconf(key); 165 if (value == -1 && errno != 0) 166 err(EX_OSERR, "sysconf: %s", name); 167 else if (value == -1) 168 printf("undefined\n"); 169 else 170 printf("%ld\n", value); 171 } 172 173 static void 174 do_pathconf(const char *name, int key, const char *path) 175 { 176 long value; 177 178 errno = 0; 179 value = pathconf(path, key); 180 if (value == -1 && errno != 0) 181 err(EX_OSERR, "pathconf: %s", name); 182 else if (value == -1) 183 printf("undefined\n"); 184 else 185 printf("%ld\n", value); 186 } 187 188