1 /* $NetBSD: getconf.c,v 1.29 2007/10/15 14:12:54 ad Exp $ */ 2 3 /*- 4 * Copyright (c) 1996, 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by J.T. Conklin. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #ifndef lint 41 __RCSID("$NetBSD: getconf.c,v 1.29 2007/10/15 14:12:54 ad Exp $"); 42 #endif /* not lint */ 43 44 #include <err.h> 45 #include <errno.h> 46 #include <limits.h> 47 #include <locale.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <unistd.h> 51 #include <string.h> 52 53 struct conf_variable 54 { 55 const char *name; 56 enum { SYSCONF, CONFSTR, PATHCONF, CONSTANT } type; 57 long value; 58 }; 59 60 static void print_longvar(const char *, long); 61 static void print_strvar(const char *, const char *); 62 static void printvar(const struct conf_variable *, const char *); 63 static void usage(void) __attribute__((__noreturn__)); 64 65 static const struct conf_variable conf_table[] = 66 { 67 { "PATH", CONFSTR, _CS_PATH }, 68 69 /* Utility Limit Minimum Values */ 70 { "POSIX2_BC_BASE_MAX", CONSTANT, _POSIX2_BC_BASE_MAX }, 71 { "POSIX2_BC_DIM_MAX", CONSTANT, _POSIX2_BC_DIM_MAX }, 72 { "POSIX2_BC_SCALE_MAX", CONSTANT, _POSIX2_BC_SCALE_MAX }, 73 { "POSIX2_BC_STRING_MAX", CONSTANT, _POSIX2_BC_STRING_MAX }, 74 { "POSIX2_COLL_WEIGHTS_MAX", CONSTANT, _POSIX2_COLL_WEIGHTS_MAX }, 75 { "POSIX2_EXPR_NEST_MAX", CONSTANT, _POSIX2_EXPR_NEST_MAX }, 76 { "POSIX2_LINE_MAX", CONSTANT, _POSIX2_LINE_MAX }, 77 { "POSIX2_RE_DUP_MAX", CONSTANT, _POSIX2_RE_DUP_MAX }, 78 { "POSIX2_VERSION", CONSTANT, _POSIX2_VERSION }, 79 80 /* POSIX.1 Minimum Values */ 81 { "_POSIX_AIO_LISTIO_MAX", CONSTANT, _POSIX_AIO_LISTIO_MAX }, 82 { "_POSIX_AIO_MAX", CONSTANT, _POSIX_AIO_MAX }, 83 { "_POSIX_ARG_MAX", CONSTANT, _POSIX_ARG_MAX }, 84 { "_POSIX_CHILD_MAX", CONSTANT, _POSIX_CHILD_MAX }, 85 { "_POSIX_LINK_MAX", CONSTANT, _POSIX_LINK_MAX }, 86 { "_POSIX_MAX_CANON", CONSTANT, _POSIX_MAX_CANON }, 87 { "_POSIX_MAX_INPUT", CONSTANT, _POSIX_MAX_INPUT }, 88 { "_POSIX_MQ_OPEN_MAX", CONSTANT, _POSIX_MQ_OPEN_MAX }, 89 { "_POSIX_MQ_PRIO_MAX", CONSTANT, _POSIX_MQ_PRIO_MAX }, 90 { "_POSIX_NAME_MAX", CONSTANT, _POSIX_NAME_MAX }, 91 { "_POSIX_NGROUPS_MAX", CONSTANT, _POSIX_NGROUPS_MAX }, 92 { "_POSIX_OPEN_MAX", CONSTANT, _POSIX_OPEN_MAX }, 93 { "_POSIX_PATH_MAX", CONSTANT, _POSIX_PATH_MAX }, 94 { "_POSIX_PIPE_BUF", CONSTANT, _POSIX_PIPE_BUF }, 95 { "_POSIX_SSIZE_MAX", CONSTANT, _POSIX_SSIZE_MAX }, 96 { "_POSIX_STREAM_MAX", CONSTANT, _POSIX_STREAM_MAX }, 97 { "_POSIX_TZNAME_MAX", CONSTANT, _POSIX_TZNAME_MAX }, 98 99 /* Symbolic Utility Limits */ 100 { "BC_BASE_MAX", SYSCONF, _SC_BC_BASE_MAX }, 101 { "BC_DIM_MAX", SYSCONF, _SC_BC_DIM_MAX }, 102 { "BC_SCALE_MAX", SYSCONF, _SC_BC_SCALE_MAX }, 103 { "BC_STRING_MAX", SYSCONF, _SC_BC_STRING_MAX }, 104 { "COLL_WEIGHTS_MAX", SYSCONF, _SC_COLL_WEIGHTS_MAX }, 105 { "EXPR_NEST_MAX", SYSCONF, _SC_EXPR_NEST_MAX }, 106 { "LINE_MAX", SYSCONF, _SC_LINE_MAX }, 107 { "RE_DUP_MAX", SYSCONF, _SC_RE_DUP_MAX }, 108 109 /* Optional Facility Configuration Values */ 110 { "POSIX2_C_BIND", SYSCONF, _SC_2_C_BIND }, 111 { "POSIX2_C_DEV", SYSCONF, _SC_2_C_DEV }, 112 { "POSIX2_CHAR_TERM", SYSCONF, _SC_2_CHAR_TERM }, 113 { "POSIX2_FORT_DEV", SYSCONF, _SC_2_FORT_DEV }, 114 { "POSIX2_FORT_RUN", SYSCONF, _SC_2_FORT_RUN }, 115 { "POSIX2_LOCALEDEF", SYSCONF, _SC_2_LOCALEDEF }, 116 { "POSIX2_SW_DEV", SYSCONF, _SC_2_SW_DEV }, 117 { "POSIX2_UPE", SYSCONF, _SC_2_UPE }, 118 119 /* POSIX.1 Configurable System Variables */ 120 { "AIO_LISTIO_MAX", SYSCONF, _SC_AIO_LISTIO_MAX }, 121 { "AIO_MAX", SYSCONF, _SC_AIO_MAX }, 122 { "ARG_MAX", SYSCONF, _SC_ARG_MAX }, 123 { "CHILD_MAX", SYSCONF, _SC_CHILD_MAX }, 124 { "CLK_TCK", SYSCONF, _SC_CLK_TCK }, 125 { "MQ_OPEN_MAX", SYSCONF, _SC_MQ_OPEN_MAX }, 126 { "MQ_PRIO_MAX", SYSCONF, _SC_MQ_PRIO_MAX }, 127 { "NGROUPS_MAX", SYSCONF, _SC_NGROUPS_MAX }, 128 { "OPEN_MAX", SYSCONF, _SC_OPEN_MAX }, 129 { "STREAM_MAX", SYSCONF, _SC_STREAM_MAX }, 130 { "TZNAME_MAX", SYSCONF, _SC_TZNAME_MAX }, 131 { "_POSIX_JOB_CONTROL", SYSCONF, _SC_JOB_CONTROL }, 132 { "_POSIX_SAVED_IDS", SYSCONF, _SC_SAVED_IDS }, 133 { "_POSIX_VERSION", SYSCONF, _SC_VERSION }, 134 135 { "LINK_MAX", PATHCONF, _PC_LINK_MAX }, 136 { "MAX_CANON", PATHCONF, _PC_MAX_CANON }, 137 { "MAX_INPUT", PATHCONF, _PC_MAX_INPUT }, 138 { "NAME_MAX", PATHCONF, _PC_NAME_MAX }, 139 { "PATH_MAX", PATHCONF, _PC_PATH_MAX }, 140 { "PIPE_BUF", PATHCONF, _PC_PIPE_BUF }, 141 { "_POSIX_CHOWN_RESTRICTED", PATHCONF, _PC_CHOWN_RESTRICTED }, 142 { "_POSIX_NO_TRUNC", PATHCONF, _PC_NO_TRUNC }, 143 { "_POSIX_VDISABLE", PATHCONF, _PC_VDISABLE }, 144 145 /* POSIX.1b Configurable System Variables */ 146 { "PAGESIZE", SYSCONF, _SC_PAGESIZE }, 147 { "_POSIX_ASYNCHRONOUS_IO", SYSCONF, _SC_ASYNCHRONOUS_IO }, 148 { "_POSIX_FSYNC", SYSCONF, _SC_FSYNC }, 149 { "_POSIX_MAPPED_FILES", SYSCONF, _SC_MAPPED_FILES }, 150 { "_POSIX_MEMLOCK", SYSCONF, _SC_MEMLOCK }, 151 { "_POSIX_MEMLOCK_RANGE", SYSCONF, _SC_MEMLOCK_RANGE }, 152 { "_POSIX_MEMORY_PROTECTION", SYSCONF, _SC_MEMORY_PROTECTION }, 153 { "_POSIX_MESSAGE_PASSING", SYSCONF, _POSIX_MESSAGE_PASSING }, 154 { "_POSIX_MONOTONIC_CLOCK", SYSCONF, _SC_MONOTONIC_CLOCK }, 155 { "_POSIX_SEMAPHORES", SYSCONF, _SC_SEMAPHORES }, 156 { "_POSIX_SYNCHRONIZED_IO", SYSCONF, _SC_SYNCHRONIZED_IO }, 157 { "_POSIX_TIMERS", SYSCONF, _SC_TIMERS }, 158 159 { "_POSIX_SYNC_IO", PATHCONF, _PC_SYNC_IO }, 160 161 /* POSIX.1c Configurable System Variables */ 162 { "LOGIN_NAME_MAX", SYSCONF, _SC_LOGIN_NAME_MAX }, 163 { "_POSIX_THREADS", SYSCONF, _SC_THREADS }, 164 165 /* POSIX.1j Configurable System Variables */ 166 { "_POSIX_BARRIERS", SYSCONF, _SC_BARRIERS }, 167 { "_POSIX_READER_WRITER_LOCKS", SYSCONF, _SC_READER_WRITER_LOCKS }, 168 { "_POSIX_SPIN_LOCKS", SYSCONF, _SC_SPIN_LOCKS }, 169 170 /* XPG4.2 Configurable System Variables */ 171 { "IOV_MAX", SYSCONF, _SC_IOV_MAX }, 172 { "PAGE_SIZE", SYSCONF, _SC_PAGE_SIZE }, 173 { "_XOPEN_SHM", SYSCONF, _SC_XOPEN_SHM }, 174 175 /* X/Open CAE Spec. Issue 5 Version 2 Configurable System Variables */ 176 { "FILESIZEBITS", PATHCONF, _PC_FILESIZEBITS }, 177 178 /* POSIX.1-2001 XSI Option Group Configurable System Variables */ 179 { "ATEXIT_MAX", SYSCONF, _SC_ATEXIT_MAX }, 180 181 /* POSIX.1-2001 TSF Configurable System Variables */ 182 { "GETGR_R_SIZE_MAX", SYSCONF, _SC_GETGR_R_SIZE_MAX }, 183 { "GETPW_R_SIZE_MAX", SYSCONF, _SC_GETPW_R_SIZE_MAX }, 184 185 #ifdef _NETBSD_SOURCE 186 /* Commonly provided extensions */ 187 { "NPROCESSORS_CONF", SYSCONF, _SC_NPROCESSORS_CONF }, 188 { "NPROCESSORS_ONLN", SYSCONF, _SC_NPROCESSORS_ONLN }, 189 #endif /* _NETBSD_SOURCE */ 190 191 { NULL, CONSTANT, 0L } 192 }; 193 194 static int a_flag = 0; /* list all variables */ 195 196 int 197 main(int argc, char **argv) 198 { 199 int ch; 200 const struct conf_variable *cp; 201 const char *varname, *pathname; 202 int found; 203 204 setprogname(argv[0]); 205 (void)setlocale(LC_ALL, ""); 206 207 while ((ch = getopt(argc, argv, "a")) != -1) { 208 switch (ch) { 209 case 'a': 210 a_flag = 1; 211 break; 212 case '?': 213 default: 214 usage(); 215 } 216 } 217 argc -= optind; 218 argv += optind; 219 220 if (!a_flag) { 221 if (argc == 0) 222 usage(); 223 varname = argv[0]; 224 argc--; 225 argv++; 226 } else 227 varname = NULL; 228 229 if (argc > 1) 230 usage(); 231 pathname = argv[0]; /* may be NULL */ 232 233 found = 0; 234 for (cp = conf_table; cp->name != NULL; cp++) { 235 if (a_flag || strcmp(varname, cp->name) == 0) { 236 /*LINTED weird expression*/ 237 if ((cp->type == PATHCONF) == (pathname != NULL)) { 238 printvar(cp, pathname); 239 found = 1; 240 } else if (!a_flag) 241 errx(EXIT_FAILURE, 242 "%s: invalid variable type", cp->name); 243 } 244 } 245 246 if (!a_flag && !found) 247 errx(EXIT_FAILURE, "%s: unknown variable", varname); 248 249 (void)fflush(stdout); 250 return ferror(stdout) ? EXIT_FAILURE : EXIT_SUCCESS; 251 } 252 253 static void 254 print_longvar(const char *name, long value) 255 { 256 if (a_flag) 257 (void)printf("%s = %ld\n", name, value); 258 else 259 (void)printf("%ld\n", value); 260 } 261 262 static void 263 print_strvar(const char *name, const char *sval) 264 { 265 if (a_flag) 266 (void)printf("%s = %s\n", name, sval); 267 else 268 (void)printf("%s\n", sval); 269 } 270 271 static void 272 printvar(const struct conf_variable *cp, const char *pathname) 273 { 274 size_t slen; 275 char *sval; 276 long val; 277 278 switch (cp->type) { 279 case CONSTANT: 280 print_longvar(cp->name, cp->value); 281 break; 282 283 case CONFSTR: 284 errno = 0; 285 slen = confstr((int)cp->value, NULL, 0); 286 if (slen == 0) { 287 if (errno != 0) 288 289 out: err(EXIT_FAILURE, "confstr(%ld)", cp->value); 290 else 291 print_strvar(cp->name, "undefined"); 292 } 293 294 if ((sval = malloc(slen)) == NULL) 295 err(EXIT_FAILURE, "Can't allocate %zu bytes", slen); 296 297 errno = 0; 298 if (confstr((int)cp->value, sval, slen) == 0) { 299 if (errno != 0) 300 goto out; 301 else 302 print_strvar(cp->name, "undefined"); 303 } else 304 print_strvar(cp->name, sval); 305 306 free(sval); 307 break; 308 309 case SYSCONF: 310 errno = 0; 311 if ((val = sysconf((int)cp->value)) == -1) { 312 if (errno != 0) 313 err(EXIT_FAILURE, "sysconf(%ld)", cp->value); 314 print_strvar(cp->name, "undefined"); 315 } else 316 print_longvar(cp->name, val); 317 break; 318 319 case PATHCONF: 320 errno = 0; 321 if ((val = pathconf(pathname, (int)cp->value)) == -1) { 322 if (errno != 0) { 323 if (a_flag && errno == EINVAL) { 324 /* Just skip invalid variables */ 325 return; 326 } 327 err(EXIT_FAILURE, "pathconf(%s, %ld)", 328 pathname, cp->value); 329 /* NOTREACHED */ 330 } 331 332 print_strvar(cp->name, "undefined"); 333 } else 334 print_longvar(cp->name, val); 335 break; 336 } 337 } 338 339 340 static void 341 usage(void) 342 { 343 const char *p = getprogname(); 344 (void)fprintf(stderr, "Usage: %s system_var\n\t%s -a\n" 345 "\t%s path_var pathname\n\t%s -a pathname\n", p, p, p, p); 346 exit(EXIT_FAILURE); 347 } 348