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 30#include <sys/types.h> 31 32#include <err.h> 33#include <errno.h> 34#include <stdbool.h> 35#include <stdio.h> 36#include <stdlib.h> 37#include <sysexits.h> 38#include <unistd.h> 39 40#include "getconf.h" 41 42static void do_allsys(void); 43static void do_allpath(const char *path); 44static void do_confstr(const char *name, int key); 45static void do_sysconf(const char *name, int key); 46static void do_pathconf(const char *name, int key, const char *path); 47 48static void 49usage(void) 50{ 51 fprintf(stderr, 52"usage: getconf -a [pathname]\n" 53" getconf [-v prog_env] system_var\n" 54" getconf [-v prog_env] path_var pathname\n"); 55 exit(EX_USAGE); 56} 57 58int 59main(int argc, char **argv) 60{ 61 bool aflag; 62 int c, key, valid; 63 const char *name, *vflag, *alt_path; 64 intmax_t limitval; 65 uintmax_t ulimitval; 66 67 aflag = false; 68 vflag = NULL; 69 while ((c = getopt(argc, argv, "av:")) != -1) { 70 switch (c) { 71 case 'a': 72 aflag = true; 73 break; 74 case 'v': 75 vflag = optarg; 76 break; 77 78 default: 79 usage(); 80 } 81 } 82 83 if (aflag) { 84 if (vflag != NULL) 85 usage(); 86 if (argv[optind] == NULL) 87 do_allsys(); 88 else 89 do_allpath(argv[optind]); 90 return (0); 91 } 92 93 if ((name = argv[optind]) == NULL) 94 usage(); 95 96 if (vflag != NULL) { 97 if ((valid = find_progenv(vflag, &alt_path)) == 0) 98 errx(EX_USAGE, "invalid programming environment %s", 99 vflag); 100 if (valid > 0 && alt_path != NULL) { 101 if (argv[optind + 1] == NULL) 102 execl(alt_path, "getconf", argv[optind], 103 (char *)NULL); 104 else 105 execl(alt_path, "getconf", argv[optind], 106 argv[optind + 1], (char *)NULL); 107 108 err(EX_OSERR, "execl: %s", alt_path); 109 } 110 if (valid < 0) 111 errx(EX_UNAVAILABLE, "environment %s is not available", 112 vflag); 113 } 114 115 if (argv[optind + 1] == NULL) { /* confstr or sysconf */ 116 if ((valid = find_unsigned_limit(name, &ulimitval)) != 0) { 117 if (valid > 0) 118 printf("%" PRIuMAX "\n", ulimitval); 119 else 120 printf("undefined\n"); 121 return 0; 122 } 123 if ((valid = find_limit(name, &limitval)) != 0) { 124 if (valid > 0) 125 printf("%" PRIdMAX "\n", limitval); 126 else 127 printf("undefined\n"); 128 129 return 0; 130 } 131 if ((valid = find_confstr(name, &key)) != 0) { 132 if (valid > 0) 133 do_confstr(name, key); 134 else 135 printf("undefined\n"); 136 } else { 137 valid = find_sysconf(name, &key); 138 if (valid > 0) { 139 do_sysconf(name, key); 140 } else if (valid < 0) { 141 printf("undefined\n"); 142 } else 143 errx(EX_USAGE, 144 "no such configuration parameter `%s'", 145 name); 146 } 147 } else { 148 valid = find_pathconf(name, &key); 149 if (valid != 0) { 150 if (valid > 0) 151 do_pathconf(name, key, argv[optind + 1]); 152 else 153 printf("undefined\n"); 154 } else 155 errx(EX_USAGE, 156 "no such path configuration parameter `%s'", 157 name); 158 } 159 return 0; 160} 161 162static void 163do_onestr(const char *name, int key) 164{ 165 size_t len; 166 167 errno = 0; 168 len = confstr(key, 0, 0); 169 if (len == 0 && errno != 0) { 170 warn("confstr: %s", name); 171 return; 172 } 173 printf("%s: ", name); 174 if (len == 0) 175 printf("undefined\n"); 176 else { 177 char buf[len + 1]; 178 179 confstr(key, buf, len); 180 printf("%s\n", buf); 181 } 182} 183 184static void 185do_onesys(const char *name, int key) 186{ 187 long value; 188 189 errno = 0; 190 value = sysconf(key); 191 if (value == -1 && errno != 0) { 192 warn("sysconf: %s", name); 193 return; 194 } 195 printf("%s: ", name); 196 if (value == -1) 197 printf("undefined\n"); 198 else 199 printf("%ld\n", value); 200} 201 202static void 203do_allsys(void) 204{ 205 206 foreach_confstr(do_onestr); 207 foreach_sysconf(do_onesys); 208} 209 210static void 211do_onepath(const char *name, int key, const char *path) 212{ 213 long value; 214 215 errno = 0; 216 value = pathconf(path, key); 217 if (value == -1 && errno != EINVAL && errno != 0) 218 warn("pathconf: %s", name); 219 printf("%s: ", name); 220 if (value == -1) 221 printf("undefined\n"); 222 else 223 printf("%ld\n", value); 224} 225 226static void 227do_allpath(const char *path) 228{ 229 230 foreach_pathconf(do_onepath, path); 231} 232 233static void 234do_confstr(const char *name, int key) 235{ 236 size_t len; 237 int savederr; 238 239 savederr = errno; 240 errno = 0; 241 len = confstr(key, 0, 0); 242 if (len == 0) { 243 if (errno) 244 err(EX_OSERR, "confstr: %s", name); 245 else 246 printf("undefined\n"); 247 } else { 248 char buf[len + 1]; 249 250 confstr(key, buf, len); 251 printf("%s\n", buf); 252 } 253 errno = savederr; 254} 255 256static void 257do_sysconf(const char *name, int key) 258{ 259 long value; 260 261 errno = 0; 262 value = sysconf(key); 263 if (value == -1 && errno != 0) 264 err(EX_OSERR, "sysconf: %s", name); 265 else if (value == -1) 266 printf("undefined\n"); 267 else 268 printf("%ld\n", value); 269} 270 271static void 272do_pathconf(const char *name, int key, const char *path) 273{ 274 long value; 275 276 errno = 0; 277 value = pathconf(path, key); 278 if (value == -1 && errno != 0) 279 err(EX_OSERR, "pathconf: %s", name); 280 else if (value == -1) 281 printf("undefined\n"); 282 else 283 printf("%ld\n", value); 284} 285 286