getconf.c revision 1.37
1 /* $NetBSD: getconf.c,v 1.37 2024/01/27 16:04:36 christos 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #ifndef lint 34 __RCSID("$NetBSD: getconf.c,v 1.37 2024/01/27 16:04:36 christos Exp $"); 35 #endif /* not lint */ 36 37 #include <err.h> 38 #include <errno.h> 39 #include <limits.h> 40 #include <locale.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <unistd.h> 44 #include <string.h> 45 46 struct conf_variable 47 { 48 const char *name; 49 enum { SYSCONF, CONFSTR, PATHCONF, CONSTANT } type; 50 long value; 51 }; 52 53 static void print_longvar(const char *, long); 54 static void print_strvar(const char *, const char *); 55 static void printvar(const struct conf_variable *, const char *); 56 static void usage(void) __dead; 57 58 static const struct conf_variable conf_table[] = 59 { 60 { "PATH", CONFSTR, _CS_PATH }, 61 62 /* Utility Limit Minimum Values */ 63 { "POSIX2_BC_BASE_MAX", CONSTANT, _POSIX2_BC_BASE_MAX }, 64 { "POSIX2_BC_DIM_MAX", CONSTANT, _POSIX2_BC_DIM_MAX }, 65 { "POSIX2_BC_SCALE_MAX", CONSTANT, _POSIX2_BC_SCALE_MAX }, 66 { "POSIX2_BC_STRING_MAX", CONSTANT, _POSIX2_BC_STRING_MAX }, 67 { "POSIX2_COLL_WEIGHTS_MAX", CONSTANT, _POSIX2_COLL_WEIGHTS_MAX }, 68 { "POSIX2_EXPR_NEST_MAX", CONSTANT, _POSIX2_EXPR_NEST_MAX }, 69 { "POSIX2_LINE_MAX", CONSTANT, _POSIX2_LINE_MAX }, 70 { "POSIX2_RE_DUP_MAX", CONSTANT, _POSIX2_RE_DUP_MAX }, 71 { "POSIX2_VERSION", CONSTANT, _POSIX2_VERSION }, 72 73 /* POSIX.1 Minimum Values */ 74 { "_POSIX_AIO_LISTIO_MAX", CONSTANT, _POSIX_AIO_LISTIO_MAX }, 75 { "_POSIX_AIO_MAX", CONSTANT, _POSIX_AIO_MAX }, 76 { "_POSIX_ARG_MAX", CONSTANT, _POSIX_ARG_MAX }, 77 { "_POSIX_CHILD_MAX", CONSTANT, _POSIX_CHILD_MAX }, 78 { "_POSIX_LINK_MAX", CONSTANT, _POSIX_LINK_MAX }, 79 { "_POSIX_MAX_CANON", CONSTANT, _POSIX_MAX_CANON }, 80 { "_POSIX_MAX_INPUT", CONSTANT, _POSIX_MAX_INPUT }, 81 { "_POSIX_MQ_OPEN_MAX", CONSTANT, _POSIX_MQ_OPEN_MAX }, 82 { "_POSIX_MQ_PRIO_MAX", CONSTANT, _POSIX_MQ_PRIO_MAX }, 83 { "_POSIX_NAME_MAX", CONSTANT, _POSIX_NAME_MAX }, 84 { "_POSIX_NGROUPS_MAX", CONSTANT, _POSIX_NGROUPS_MAX }, 85 { "_POSIX_OPEN_MAX", CONSTANT, _POSIX_OPEN_MAX }, 86 { "_POSIX_PATH_MAX", CONSTANT, _POSIX_PATH_MAX }, 87 { "_POSIX_PIPE_BUF", CONSTANT, _POSIX_PIPE_BUF }, 88 { "_POSIX_SSIZE_MAX", CONSTANT, _POSIX_SSIZE_MAX }, 89 { "_POSIX_STREAM_MAX", CONSTANT, _POSIX_STREAM_MAX }, 90 { "_POSIX_TZNAME_MAX", CONSTANT, _POSIX_TZNAME_MAX }, 91 92 /* Symbolic Utility Limits */ 93 { "BC_BASE_MAX", SYSCONF, _SC_BC_BASE_MAX }, 94 { "BC_DIM_MAX", SYSCONF, _SC_BC_DIM_MAX }, 95 { "BC_SCALE_MAX", SYSCONF, _SC_BC_SCALE_MAX }, 96 { "BC_STRING_MAX", SYSCONF, _SC_BC_STRING_MAX }, 97 { "COLL_WEIGHTS_MAX", SYSCONF, _SC_COLL_WEIGHTS_MAX }, 98 { "EXPR_NEST_MAX", SYSCONF, _SC_EXPR_NEST_MAX }, 99 { "LINE_MAX", SYSCONF, _SC_LINE_MAX }, 100 { "RE_DUP_MAX", SYSCONF, _SC_RE_DUP_MAX }, 101 102 /* Optional Facility Configuration Values */ 103 { "_POSIX2_C_BIND", SYSCONF, _SC_2_C_BIND }, 104 { "POSIX2_C_DEV", SYSCONF, _SC_2_C_DEV }, 105 { "POSIX2_CHAR_TERM", SYSCONF, _SC_2_CHAR_TERM }, 106 { "POSIX2_FORT_DEV", SYSCONF, _SC_2_FORT_DEV }, 107 { "POSIX2_FORT_RUN", SYSCONF, _SC_2_FORT_RUN }, 108 { "POSIX2_LOCALEDEF", SYSCONF, _SC_2_LOCALEDEF }, 109 { "POSIX2_SW_DEV", SYSCONF, _SC_2_SW_DEV }, 110 { "POSIX2_UPE", SYSCONF, _SC_2_UPE }, 111 112 /* POSIX.1 Configurable System Variables */ 113 { "AIO_LISTIO_MAX", SYSCONF, _SC_AIO_LISTIO_MAX }, 114 { "AIO_MAX", SYSCONF, _SC_AIO_MAX }, 115 { "ARG_MAX", SYSCONF, _SC_ARG_MAX }, 116 { "CHILD_MAX", SYSCONF, _SC_CHILD_MAX }, 117 { "CLK_TCK", SYSCONF, _SC_CLK_TCK }, 118 { "MQ_OPEN_MAX", SYSCONF, _SC_MQ_OPEN_MAX }, 119 { "MQ_PRIO_MAX", SYSCONF, _SC_MQ_PRIO_MAX }, 120 { "NGROUPS_MAX", SYSCONF, _SC_NGROUPS_MAX }, 121 { "OPEN_MAX", SYSCONF, _SC_OPEN_MAX }, 122 { "STREAM_MAX", SYSCONF, _SC_STREAM_MAX }, 123 { "TZNAME_MAX", SYSCONF, _SC_TZNAME_MAX }, 124 { "_POSIX_JOB_CONTROL", SYSCONF, _SC_JOB_CONTROL }, 125 { "_POSIX_SAVED_IDS", SYSCONF, _SC_SAVED_IDS }, 126 { "_POSIX_VERSION", SYSCONF, _SC_VERSION }, 127 128 { "LINK_MAX", PATHCONF, _PC_LINK_MAX }, 129 { "MAX_CANON", PATHCONF, _PC_MAX_CANON }, 130 { "MAX_INPUT", PATHCONF, _PC_MAX_INPUT }, 131 { "NAME_MAX", PATHCONF, _PC_NAME_MAX }, 132 { "PATH_MAX", PATHCONF, _PC_PATH_MAX }, 133 { "PIPE_BUF", PATHCONF, _PC_PIPE_BUF }, 134 { "_POSIX_CHOWN_RESTRICTED", PATHCONF, _PC_CHOWN_RESTRICTED }, 135 { "_POSIX_NO_TRUNC", PATHCONF, _PC_NO_TRUNC }, 136 { "_POSIX_VDISABLE", PATHCONF, _PC_VDISABLE }, 137 138 /* POSIX.1b Configurable System Variables */ 139 { "PAGESIZE", SYSCONF, _SC_PAGESIZE }, 140 { "_POSIX_ASYNCHRONOUS_IO", SYSCONF, _SC_ASYNCHRONOUS_IO }, 141 { "_POSIX_FSYNC", SYSCONF, _SC_FSYNC }, 142 { "_POSIX_MAPPED_FILES", SYSCONF, _SC_MAPPED_FILES }, 143 { "_POSIX_MEMLOCK", SYSCONF, _SC_MEMLOCK }, 144 { "_POSIX_MEMLOCK_RANGE", SYSCONF, _SC_MEMLOCK_RANGE }, 145 { "_POSIX_MEMORY_PROTECTION", SYSCONF, _SC_MEMORY_PROTECTION }, 146 { "_POSIX_MESSAGE_PASSING", SYSCONF, _SC_MESSAGE_PASSING }, 147 { "_POSIX_MONOTONIC_CLOCK", SYSCONF, _SC_MONOTONIC_CLOCK }, 148 { "_POSIX_PRIORITY_SCHEDULING", SYSCONF, _SC_PRIORITY_SCHEDULING }, 149 { "_POSIX_SEMAPHORES", SYSCONF, _SC_SEMAPHORES }, 150 { "_POSIX_SHARED_MEMORY_OBJECTS", SYSCONF, _SC_SHARED_MEMORY_OBJECTS }, 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 /* Extensions found in Solaris and Linux. */ 181 { "SC_PHYS_PAGES", SYSCONF, _SC_PHYS_PAGES }, 182 { "SC_AVPHYS_PAGES", SYSCONF, _SC_AVPHYS_PAGES }, 183 184 #ifdef _NETBSD_SOURCE 185 /* Commonly provided extensions */ 186 { "NPROCESSORS_CONF", SYSCONF, _SC_NPROCESSORS_CONF }, 187 { "NPROCESSORS_ONLN", SYSCONF, _SC_NPROCESSORS_ONLN }, 188 #endif /* _NETBSD_SOURCE */ 189 190 { NULL, CONSTANT, 0L } 191 }; 192 193 static int a_flag = 0; /* list all variables */ 194 195 int 196 main(int argc, char **argv) 197 { 198 int ch; 199 const struct conf_variable *cp; 200 const char *varname, *pathname, *vn; 201 int found; 202 203 setprogname(argv[0]); 204 (void)setlocale(LC_ALL, ""); 205 206 while ((ch = getopt(argc, argv, "a")) != -1) { 207 switch (ch) { 208 case 'a': 209 a_flag = 1; 210 break; 211 case '?': 212 default: 213 usage(); 214 } 215 } 216 argc -= optind; 217 argv += optind; 218 219 if (!a_flag) { 220 if (argc == 0) 221 usage(); 222 varname = argv[0]; 223 argc--; 224 argv++; 225 } else 226 varname = NULL; 227 228 if (argc > 1) 229 usage(); 230 pathname = argv[0]; /* may be NULL */ 231 232 found = 0; 233 vn = varname; 234 again: 235 for (cp = conf_table; cp->name != NULL; cp++) { 236 if (a_flag || strcmp(vn, cp->name) == 0) { 237 /*LINTED weird expression*/ 238 if ((cp->type == PATHCONF) == (pathname != NULL)) { 239 printvar(cp, pathname); 240 found = 1; 241 } else if (!a_flag) 242 errx(EXIT_FAILURE, 243 "%s: invalid variable type", cp->name); 244 } 245 } 246 247 if (!a_flag && !found) { 248 if (*vn++ == '_') 249 goto again; 250 errx(EXIT_FAILURE, "%s: unknown variable", varname); 251 } 252 253 (void)fflush(stdout); 254 return ferror(stdout) ? EXIT_FAILURE : EXIT_SUCCESS; 255 } 256 257 static void 258 print_longvar(const char *name, long value) 259 { 260 if (a_flag) 261 (void)printf("%s = %ld\n", name, value); 262 else 263 (void)printf("%ld\n", value); 264 } 265 266 static void 267 print_strvar(const char *name, const char *sval) 268 { 269 if (a_flag) 270 (void)printf("%s = %s\n", name, sval); 271 else 272 (void)printf("%s\n", sval); 273 } 274 275 static void 276 printvar(const struct conf_variable *cp, const char *pathname) 277 { 278 size_t slen; 279 char *sval; 280 long val; 281 282 switch (cp->type) { 283 case CONSTANT: 284 print_longvar(cp->name, cp->value); 285 break; 286 287 case CONFSTR: 288 errno = 0; 289 slen = confstr((int)cp->value, NULL, 0); 290 if (slen == 0) { 291 if (errno != 0) 292 293 out: err(EXIT_FAILURE, "confstr(%ld)", cp->value); 294 else 295 print_strvar(cp->name, "undefined"); 296 } 297 298 if ((sval = malloc(slen)) == NULL) 299 err(EXIT_FAILURE, "Can't allocate %zu bytes", slen); 300 301 errno = 0; 302 if (confstr((int)cp->value, sval, slen) == 0) { 303 if (errno != 0) 304 goto out; 305 else 306 print_strvar(cp->name, "undefined"); 307 } else 308 print_strvar(cp->name, sval); 309 310 free(sval); 311 break; 312 313 case SYSCONF: 314 errno = 0; 315 if ((val = sysconf((int)cp->value)) == -1) { 316 if (errno != 0) 317 err(EXIT_FAILURE, "sysconf(%ld)", cp->value); 318 print_strvar(cp->name, "undefined"); 319 } else 320 print_longvar(cp->name, val); 321 break; 322 323 case PATHCONF: 324 errno = 0; 325 if ((val = pathconf(pathname, (int)cp->value)) == -1) { 326 if (errno != 0) { 327 if (a_flag && errno == EINVAL) { 328 /* Just skip invalid variables */ 329 return; 330 } 331 err(EXIT_FAILURE, "pathconf(%s, %ld)", 332 pathname, cp->value); 333 /* NOTREACHED */ 334 } 335 336 print_strvar(cp->name, "undefined"); 337 } else 338 print_longvar(cp->name, val); 339 break; 340 } 341 } 342 343 344 static void 345 usage(void) 346 { 347 const char *p = getprogname(); 348 (void)fprintf(stderr, "Usage: %s system_var\n\t%s -a\n" 349 "\t%s path_var pathname\n\t%s -a pathname\n", p, p, p, p); 350 exit(EXIT_FAILURE); 351 } 352
Indexes created Mon Sep 22 13:09:51 GMT 2025