getconf.c revision 1.27
1 /* $NetBSD: getconf.c,v 1.27 2007/05/01 01:01:37 rmind 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 1.27 2007/05/01 01:01:37 rmind 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_NAME_MAX", CONSTANT, _POSIX_NAME_MAX }, 89 { "_POSIX_NGROUPS_MAX", CONSTANT, _POSIX_NGROUPS_MAX }, 90 { "_POSIX_OPEN_MAX", CONSTANT, _POSIX_OPEN_MAX }, 91 { "_POSIX_PATH_MAX", CONSTANT, _POSIX_PATH_MAX }, 92 { "_POSIX_PIPE_BUF", CONSTANT, _POSIX_PIPE_BUF }, 93 { "_POSIX_SSIZE_MAX", CONSTANT, _POSIX_SSIZE_MAX }, 94 { "_POSIX_STREAM_MAX", CONSTANT, _POSIX_STREAM_MAX }, 95 { "_POSIX_TZNAME_MAX", CONSTANT, _POSIX_TZNAME_MAX }, 96 97 /* Symbolic Utility Limits */ 98 { "BC_BASE_MAX", SYSCONF, _SC_BC_BASE_MAX }, 99 { "BC_DIM_MAX", SYSCONF, _SC_BC_DIM_MAX }, 100 { "BC_SCALE_MAX", SYSCONF, _SC_BC_SCALE_MAX }, 101 { "BC_STRING_MAX", SYSCONF, _SC_BC_STRING_MAX }, 102 { "COLL_WEIGHTS_MAX", SYSCONF, _SC_COLL_WEIGHTS_MAX }, 103 { "EXPR_NEST_MAX", SYSCONF, _SC_EXPR_NEST_MAX }, 104 { "LINE_MAX", SYSCONF, _SC_LINE_MAX }, 105 { "RE_DUP_MAX", SYSCONF, _SC_RE_DUP_MAX }, 106 107 /* Optional Facility Configuration Values */ 108 { "POSIX2_C_BIND", SYSCONF, _SC_2_C_BIND }, 109 { "POSIX2_C_DEV", SYSCONF, _SC_2_C_DEV }, 110 { "POSIX2_CHAR_TERM", SYSCONF, _SC_2_CHAR_TERM }, 111 { "POSIX2_FORT_DEV", SYSCONF, _SC_2_FORT_DEV }, 112 { "POSIX2_FORT_RUN", SYSCONF, _SC_2_FORT_RUN }, 113 { "POSIX2_LOCALEDEF", SYSCONF, _SC_2_LOCALEDEF }, 114 { "POSIX2_SW_DEV", SYSCONF, _SC_2_SW_DEV }, 115 { "POSIX2_UPE", SYSCONF, _SC_2_UPE }, 116 117 /* POSIX.1 Configurable System Variables */ 118 { "AIO_LISTIO_MAX", SYSCONF, _SC_AIO_LISTIO_MAX }, 119 { "AIO_MAX", SYSCONF, _SC_AIO_MAX }, 120 { "ARG_MAX", SYSCONF, _SC_ARG_MAX }, 121 { "CHILD_MAX", SYSCONF, _SC_CHILD_MAX }, 122 { "CLK_TCK", SYSCONF, _SC_CLK_TCK }, 123 { "NGROUPS_MAX", SYSCONF, _SC_NGROUPS_MAX }, 124 { "OPEN_MAX", SYSCONF, _SC_OPEN_MAX }, 125 { "STREAM_MAX", SYSCONF, _SC_STREAM_MAX }, 126 { "TZNAME_MAX", SYSCONF, _SC_TZNAME_MAX }, 127 { "_POSIX_JOB_CONTROL", SYSCONF, _SC_JOB_CONTROL }, 128 { "_POSIX_SAVED_IDS", SYSCONF, _SC_SAVED_IDS }, 129 { "_POSIX_VERSION", SYSCONF, _SC_VERSION }, 130 131 { "LINK_MAX", PATHCONF, _PC_LINK_MAX }, 132 { "MAX_CANON", PATHCONF, _PC_MAX_CANON }, 133 { "MAX_INPUT", PATHCONF, _PC_MAX_INPUT }, 134 { "NAME_MAX", PATHCONF, _PC_NAME_MAX }, 135 { "PATH_MAX", PATHCONF, _PC_PATH_MAX }, 136 { "PIPE_BUF", PATHCONF, _PC_PIPE_BUF }, 137 { "_POSIX_CHOWN_RESTRICTED", PATHCONF, _PC_CHOWN_RESTRICTED }, 138 { "_POSIX_NO_TRUNC", PATHCONF, _PC_NO_TRUNC }, 139 { "_POSIX_VDISABLE", PATHCONF, _PC_VDISABLE }, 140 141 /* POSIX.1b Configurable System Variables */ 142 { "PAGESIZE", SYSCONF, _SC_PAGESIZE }, 143 { "_POSIX_ASYNCHRONOUS_IO", SYSCONF, _SC_ASYNCHRONOUS_IO }, 144 { "_POSIX_FSYNC", SYSCONF, _SC_FSYNC }, 145 { "_POSIX_MAPPED_FILES", SYSCONF, _SC_MAPPED_FILES }, 146 { "_POSIX_MEMLOCK", SYSCONF, _SC_MEMLOCK }, 147 { "_POSIX_MEMLOCK_RANGE", SYSCONF, _SC_MEMLOCK_RANGE }, 148 { "_POSIX_MEMORY_PROTECTION", SYSCONF, _SC_MEMORY_PROTECTION }, 149 { "_POSIX_MONOTONIC_CLOCK", SYSCONF, _SC_MONOTONIC_CLOCK }, 150 { "_POSIX_SEMAPHORES", SYSCONF, _SC_SEMAPHORES }, 151 { "_POSIX_SYNCHRONIZED_IO", SYSCONF, _SC_SYNCHRONIZED_IO }, 152 { "_POSIX_TIMERS", SYSCONF, _SC_TIMERS }, 153 154 { "_POSIX_SYNC_IO", PATHCONF, _PC_SYNC_IO }, 155 156 /* POSIX.1c Configurable System Variables */ 157 { "LOGIN_NAME_MAX", SYSCONF, _SC_LOGIN_NAME_MAX }, 158 { "_POSIX_THREADS", SYSCONF, _SC_THREADS }, 159 160 /* POSIX.1j Configurable System Variables */ 161 { "_POSIX_BARRIERS", SYSCONF, _SC_BARRIERS }, 162 { "_POSIX_READER_WRITER_LOCKS", SYSCONF, _SC_READER_WRITER_LOCKS }, 163 { "_POSIX_SPIN_LOCKS", SYSCONF, _SC_SPIN_LOCKS }, 164 165 /* XPG4.2 Configurable System Variables */ 166 { "IOV_MAX", SYSCONF, _SC_IOV_MAX }, 167 { "PAGE_SIZE", SYSCONF, _SC_PAGE_SIZE }, 168 { "_XOPEN_SHM", SYSCONF, _SC_XOPEN_SHM }, 169 170 /* X/Open CAE Spec. Issue 5 Version 2 Configurable System Variables */ 171 { "FILESIZEBITS", PATHCONF, _PC_FILESIZEBITS }, 172 173 /* POSIX.1-2001 XSI Option Group Configurable System Variables */ 174 { "ATEXIT_MAX", SYSCONF, _SC_ATEXIT_MAX }, 175 176 /* POSIX.1-2001 TSF Configurable System Variables */ 177 { "GETGR_R_SIZE_MAX", SYSCONF, _SC_GETGR_R_SIZE_MAX }, 178 { "GETPW_R_SIZE_MAX", SYSCONF, _SC_GETPW_R_SIZE_MAX }, 179 180 { NULL, CONSTANT, 0L } 181 }; 182 183 static int a_flag = 0; /* list all variables */ 184 185 int 186 main(int argc, char **argv) 187 { 188 int ch; 189 const struct conf_variable *cp; 190 const char *varname, *pathname; 191 int found; 192 193 setprogname(argv[0]); 194 (void)setlocale(LC_ALL, ""); 195 196 while ((ch = getopt(argc, argv, "a")) != -1) { 197 switch (ch) { 198 case 'a': 199 a_flag = 1; 200 break; 201 case '?': 202 default: 203 usage(); 204 } 205 } 206 argc -= optind; 207 argv += optind; 208 209 if (!a_flag) { 210 if (argc == 0) 211 usage(); 212 varname = argv[0]; 213 argc--; 214 argv++; 215 } else 216 varname = NULL; 217 218 if (argc > 1) 219 usage(); 220 pathname = argv[0]; /* may be NULL */ 221 222 found = 0; 223 for (cp = conf_table; cp->name != NULL; cp++) { 224 if (a_flag || strcmp(varname, cp->name) == 0) { 225 /*LINTED weird expression*/ 226 if ((cp->type == PATHCONF) == (pathname != NULL)) { 227 printvar(cp, pathname); 228 found = 1; 229 } else if (!a_flag) 230 errx(EXIT_FAILURE, 231 "%s: invalid variable type", cp->name); 232 } 233 } 234 235 if (!a_flag && !found) 236 errx(EXIT_FAILURE, "%s: unknown variable", varname); 237 238 (void)fflush(stdout); 239 return ferror(stdout) ? EXIT_FAILURE : EXIT_SUCCESS; 240 } 241 242 static void 243 print_longvar(const char *name, long value) 244 { 245 if (a_flag) 246 (void)printf("%s = %ld\n", name, value); 247 else 248 (void)printf("%ld\n", value); 249 } 250 251 static void 252 print_strvar(const char *name, const char *sval) 253 { 254 if (a_flag) 255 (void)printf("%s = %s\n", name, sval); 256 else 257 (void)printf("%s\n", sval); 258 } 259 260 static void 261 printvar(const struct conf_variable *cp, const char *pathname) 262 { 263 size_t slen; 264 char *sval; 265 long val; 266 267 switch (cp->type) { 268 case CONSTANT: 269 print_longvar(cp->name, cp->value); 270 break; 271 272 case CONFSTR: 273 errno = 0; 274 slen = confstr((int)cp->value, NULL, 0); 275 if (slen == 0) { 276 if (errno != 0) 277 278 out: err(EXIT_FAILURE, "confstr(%ld)", cp->value); 279 else 280 print_strvar(cp->name, "undefined"); 281 } 282 283 if ((sval = malloc(slen)) == NULL) 284 err(EXIT_FAILURE, "Can't allocate %zu bytes", slen); 285 286 errno = 0; 287 if (confstr((int)cp->value, sval, slen) == 0) { 288 if (errno != 0) 289 goto out; 290 else 291 print_strvar(cp->name, "undefined"); 292 } else 293 print_strvar(cp->name, sval); 294 295 free(sval); 296 break; 297 298 case SYSCONF: 299 errno = 0; 300 if ((val = sysconf((int)cp->value)) == -1) { 301 if (errno != 0) 302 err(EXIT_FAILURE, "sysconf(%ld)", cp->value); 303 print_strvar(cp->name, "undefined"); 304 } else 305 print_longvar(cp->name, val); 306 break; 307 308 case PATHCONF: 309 errno = 0; 310 if ((val = pathconf(pathname, (int)cp->value)) == -1) { 311 if (errno != 0) { 312 if (a_flag && errno == EINVAL) { 313 /* Just skip invalid variables */ 314 return; 315 } 316 err(EXIT_FAILURE, "pathconf(%s, %ld)", 317 pathname, cp->value); 318 /* NOTREACHED */ 319 } 320 321 print_strvar(cp->name, "undefined"); 322 } else 323 print_longvar(cp->name, val); 324 break; 325 } 326 } 327 328 329 static void 330 usage(void) 331 { 332 const char *p = getprogname(); 333 (void)fprintf(stderr, "Usage: %s system_var\n\t%s -a\n" 334 "\t%s path_var pathname\n\t%s -a pathname\n", p, p, p, p); 335 exit(EXIT_FAILURE); 336 } 337
Indexes created Mon Sep 22 13:09:51 GMT 2025