getconf.c revision 1.38
1 /* $NetBSD: getconf.c,v 1.38 2024/07/22 21:03:17 rillig 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 __RCSID("$NetBSD: getconf.c,v 1.38 2024/07/22 21:03:17 rillig Exp $"); 34 35 #include <err.h> 36 #include <errno.h> 37 #include <limits.h> 38 #include <locale.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <unistd.h> 42 #include <string.h> 43 44 struct conf_variable 45 { 46 const char *name; 47 enum { SYSCONF, CONFSTR, PATHCONF, CONSTANT } type; 48 long value; 49 }; 50 51 static void print_longvar(const char *, long); 52 static void print_strvar(const char *, const char *); 53 static void printvar(const struct conf_variable *, const char *); 54 static void usage(void) __dead; 55 56 static const struct conf_variable conf_table[] = 57 { 58 { "PATH", CONFSTR, _CS_PATH }, 59 60 /* Utility Limit Minimum Values */ 61 { "POSIX2_BC_BASE_MAX", CONSTANT, _POSIX2_BC_BASE_MAX }, 62 { "POSIX2_BC_DIM_MAX", CONSTANT, _POSIX2_BC_DIM_MAX }, 63 { "POSIX2_BC_SCALE_MAX", CONSTANT, _POSIX2_BC_SCALE_MAX }, 64 { "POSIX2_BC_STRING_MAX", CONSTANT, _POSIX2_BC_STRING_MAX }, 65 { "POSIX2_COLL_WEIGHTS_MAX", CONSTANT, _POSIX2_COLL_WEIGHTS_MAX }, 66 { "POSIX2_EXPR_NEST_MAX", CONSTANT, _POSIX2_EXPR_NEST_MAX }, 67 { "POSIX2_LINE_MAX", CONSTANT, _POSIX2_LINE_MAX }, 68 { "POSIX2_RE_DUP_MAX", CONSTANT, _POSIX2_RE_DUP_MAX }, 69 { "POSIX2_VERSION", CONSTANT, _POSIX2_VERSION }, 70 71 /* POSIX.1 Minimum Values */ 72 { "_POSIX_AIO_LISTIO_MAX", CONSTANT, _POSIX_AIO_LISTIO_MAX }, 73 { "_POSIX_AIO_MAX", CONSTANT, _POSIX_AIO_MAX }, 74 { "_POSIX_ARG_MAX", CONSTANT, _POSIX_ARG_MAX }, 75 { "_POSIX_CHILD_MAX", CONSTANT, _POSIX_CHILD_MAX }, 76 { "_POSIX_LINK_MAX", CONSTANT, _POSIX_LINK_MAX }, 77 { "_POSIX_MAX_CANON", CONSTANT, _POSIX_MAX_CANON }, 78 { "_POSIX_MAX_INPUT", CONSTANT, _POSIX_MAX_INPUT }, 79 { "_POSIX_MQ_OPEN_MAX", CONSTANT, _POSIX_MQ_OPEN_MAX }, 80 { "_POSIX_MQ_PRIO_MAX", CONSTANT, _POSIX_MQ_PRIO_MAX }, 81 { "_POSIX_NAME_MAX", CONSTANT, _POSIX_NAME_MAX }, 82 { "_POSIX_NGROUPS_MAX", CONSTANT, _POSIX_NGROUPS_MAX }, 83 { "_POSIX_OPEN_MAX", CONSTANT, _POSIX_OPEN_MAX }, 84 { "_POSIX_PATH_MAX", CONSTANT, _POSIX_PATH_MAX }, 85 { "_POSIX_PIPE_BUF", CONSTANT, _POSIX_PIPE_BUF }, 86 { "_POSIX_SSIZE_MAX", CONSTANT, _POSIX_SSIZE_MAX }, 87 { "_POSIX_STREAM_MAX", CONSTANT, _POSIX_STREAM_MAX }, 88 { "_POSIX_TZNAME_MAX", CONSTANT, _POSIX_TZNAME_MAX }, 89 90 /* Symbolic Utility Limits */ 91 { "BC_BASE_MAX", SYSCONF, _SC_BC_BASE_MAX }, 92 { "BC_DIM_MAX", SYSCONF, _SC_BC_DIM_MAX }, 93 { "BC_SCALE_MAX", SYSCONF, _SC_BC_SCALE_MAX }, 94 { "BC_STRING_MAX", SYSCONF, _SC_BC_STRING_MAX }, 95 { "COLL_WEIGHTS_MAX", SYSCONF, _SC_COLL_WEIGHTS_MAX }, 96 { "EXPR_NEST_MAX", SYSCONF, _SC_EXPR_NEST_MAX }, 97 { "LINE_MAX", SYSCONF, _SC_LINE_MAX }, 98 { "RE_DUP_MAX", SYSCONF, _SC_RE_DUP_MAX }, 99 100 /* Optional Facility Configuration Values */ 101 { "_POSIX2_C_BIND", SYSCONF, _SC_2_C_BIND }, 102 { "POSIX2_C_DEV", SYSCONF, _SC_2_C_DEV }, 103 { "POSIX2_CHAR_TERM", SYSCONF, _SC_2_CHAR_TERM }, 104 { "POSIX2_FORT_DEV", SYSCONF, _SC_2_FORT_DEV }, 105 { "POSIX2_FORT_RUN", SYSCONF, _SC_2_FORT_RUN }, 106 { "POSIX2_LOCALEDEF", SYSCONF, _SC_2_LOCALEDEF }, 107 { "POSIX2_SW_DEV", SYSCONF, _SC_2_SW_DEV }, 108 { "POSIX2_UPE", SYSCONF, _SC_2_UPE }, 109 110 /* POSIX.1 Configurable System Variables */ 111 { "AIO_LISTIO_MAX", SYSCONF, _SC_AIO_LISTIO_MAX }, 112 { "AIO_MAX", SYSCONF, _SC_AIO_MAX }, 113 { "ARG_MAX", SYSCONF, _SC_ARG_MAX }, 114 { "CHILD_MAX", SYSCONF, _SC_CHILD_MAX }, 115 { "CLK_TCK", SYSCONF, _SC_CLK_TCK }, 116 { "MQ_OPEN_MAX", SYSCONF, _SC_MQ_OPEN_MAX }, 117 { "MQ_PRIO_MAX", SYSCONF, _SC_MQ_PRIO_MAX }, 118 { "NGROUPS_MAX", SYSCONF, _SC_NGROUPS_MAX }, 119 { "OPEN_MAX", SYSCONF, _SC_OPEN_MAX }, 120 { "STREAM_MAX", SYSCONF, _SC_STREAM_MAX }, 121 { "TZNAME_MAX", SYSCONF, _SC_TZNAME_MAX }, 122 { "_POSIX_JOB_CONTROL", SYSCONF, _SC_JOB_CONTROL }, 123 { "_POSIX_SAVED_IDS", SYSCONF, _SC_SAVED_IDS }, 124 { "_POSIX_VERSION", SYSCONF, _SC_VERSION }, 125 126 { "LINK_MAX", PATHCONF, _PC_LINK_MAX }, 127 { "MAX_CANON", PATHCONF, _PC_MAX_CANON }, 128 { "MAX_INPUT", PATHCONF, _PC_MAX_INPUT }, 129 { "NAME_MAX", PATHCONF, _PC_NAME_MAX }, 130 { "PATH_MAX", PATHCONF, _PC_PATH_MAX }, 131 { "PIPE_BUF", PATHCONF, _PC_PIPE_BUF }, 132 { "_POSIX_CHOWN_RESTRICTED", PATHCONF, _PC_CHOWN_RESTRICTED }, 133 { "_POSIX_NO_TRUNC", PATHCONF, _PC_NO_TRUNC }, 134 { "_POSIX_VDISABLE", PATHCONF, _PC_VDISABLE }, 135 136 /* POSIX.1b Configurable System Variables */ 137 { "PAGESIZE", SYSCONF, _SC_PAGESIZE }, 138 { "_POSIX_ASYNCHRONOUS_IO", SYSCONF, _SC_ASYNCHRONOUS_IO }, 139 { "_POSIX_FSYNC", SYSCONF, _SC_FSYNC }, 140 { "_POSIX_MAPPED_FILES", SYSCONF, _SC_MAPPED_FILES }, 141 { "_POSIX_MEMLOCK", SYSCONF, _SC_MEMLOCK }, 142 { "_POSIX_MEMLOCK_RANGE", SYSCONF, _SC_MEMLOCK_RANGE }, 143 { "_POSIX_MEMORY_PROTECTION", SYSCONF, _SC_MEMORY_PROTECTION }, 144 { "_POSIX_MESSAGE_PASSING", SYSCONF, _SC_MESSAGE_PASSING }, 145 { "_POSIX_MONOTONIC_CLOCK", SYSCONF, _SC_MONOTONIC_CLOCK }, 146 { "_POSIX_PRIORITY_SCHEDULING", SYSCONF, _SC_PRIORITY_SCHEDULING }, 147 { "_POSIX_SEMAPHORES", SYSCONF, _SC_SEMAPHORES }, 148 { "_POSIX_SHARED_MEMORY_OBJECTS", SYSCONF, _SC_SHARED_MEMORY_OBJECTS }, 149 { "_POSIX_SYNCHRONIZED_IO", SYSCONF, _SC_SYNCHRONIZED_IO }, 150 { "_POSIX_TIMERS", SYSCONF, _SC_TIMERS }, 151 152 { "_POSIX_SYNC_IO", PATHCONF, _PC_SYNC_IO }, 153 154 /* POSIX.1c Configurable System Variables */ 155 { "LOGIN_NAME_MAX", SYSCONF, _SC_LOGIN_NAME_MAX }, 156 { "_POSIX_THREADS", SYSCONF, _SC_THREADS }, 157 158 /* POSIX.1j Configurable System Variables */ 159 { "_POSIX_BARRIERS", SYSCONF, _SC_BARRIERS }, 160 { "_POSIX_READER_WRITER_LOCKS", SYSCONF, _SC_READER_WRITER_LOCKS }, 161 { "_POSIX_SPIN_LOCKS", SYSCONF, _SC_SPIN_LOCKS }, 162 163 /* XPG4.2 Configurable System Variables */ 164 { "IOV_MAX", SYSCONF, _SC_IOV_MAX }, 165 { "PAGE_SIZE", SYSCONF, _SC_PAGE_SIZE }, 166 { "_XOPEN_SHM", SYSCONF, _SC_XOPEN_SHM }, 167 168 /* X/Open CAE Spec. Issue 5 Version 2 Configurable System Variables */ 169 { "FILESIZEBITS", PATHCONF, _PC_FILESIZEBITS }, 170 171 /* POSIX.1-2001 XSI Option Group Configurable System Variables */ 172 { "ATEXIT_MAX", SYSCONF, _SC_ATEXIT_MAX }, 173 174 /* POSIX.1-2001 TSF Configurable System Variables */ 175 { "GETGR_R_SIZE_MAX", SYSCONF, _SC_GETGR_R_SIZE_MAX }, 176 { "GETPW_R_SIZE_MAX", SYSCONF, _SC_GETPW_R_SIZE_MAX }, 177 178 /* Extensions found in Solaris and Linux. */ 179 { "SC_PHYS_PAGES", SYSCONF, _SC_PHYS_PAGES }, 180 { "SC_AVPHYS_PAGES", SYSCONF, _SC_AVPHYS_PAGES }, 181 182 #ifdef _NETBSD_SOURCE 183 /* Commonly provided extensions */ 184 { "NPROCESSORS_CONF", SYSCONF, _SC_NPROCESSORS_CONF }, 185 { "NPROCESSORS_ONLN", SYSCONF, _SC_NPROCESSORS_ONLN }, 186 #endif /* _NETBSD_SOURCE */ 187 188 { NULL, CONSTANT, 0L } 189 }; 190 191 static int a_flag = 0; /* list all variables */ 192 193 int 194 main(int argc, char **argv) 195 { 196 int ch; 197 const struct conf_variable *cp; 198 const char *varname, *pathname, *vn; 199 int found; 200 201 setprogname(argv[0]); 202 (void)setlocale(LC_ALL, ""); 203 204 while ((ch = getopt(argc, argv, "a")) != -1) { 205 switch (ch) { 206 case 'a': 207 a_flag = 1; 208 break; 209 case '?': 210 default: 211 usage(); 212 } 213 } 214 argc -= optind; 215 argv += optind; 216 217 if (!a_flag) { 218 if (argc == 0) 219 usage(); 220 varname = argv[0]; 221 argc--; 222 argv++; 223 } else 224 varname = NULL; 225 226 if (argc > 1) 227 usage(); 228 pathname = argv[0]; /* may be NULL */ 229 230 found = 0; 231 vn = varname; 232 again: 233 for (cp = conf_table; cp->name != NULL; cp++) { 234 if (a_flag || strcmp(vn, cp->name) == 0) { 235 if ((cp->type == PATHCONF) == (pathname != NULL)) { 236 printvar(cp, pathname); 237 found = 1; 238 } else if (!a_flag) 239 errx(EXIT_FAILURE, 240 "%s: invalid variable type", cp->name); 241 } 242 } 243 244 if (!a_flag && !found) { 245 if (*vn++ == '_') 246 goto again; 247 errx(EXIT_FAILURE, "%s: unknown variable", varname); 248 } 249 250 (void)fflush(stdout); 251 return ferror(stdout) ? EXIT_FAILURE : EXIT_SUCCESS; 252 } 253 254 static void 255 print_longvar(const char *name, long value) 256 { 257 if (a_flag) 258 (void)printf("%s = %ld\n", name, value); 259 else 260 (void)printf("%ld\n", value); 261 } 262 263 static void 264 print_strvar(const char *name, const char *sval) 265 { 266 if (a_flag) 267 (void)printf("%s = %s\n", name, sval); 268 else 269 (void)printf("%s\n", sval); 270 } 271 272 static void 273 printvar(const struct conf_variable *cp, const char *pathname) 274 { 275 size_t slen; 276 char *sval; 277 long val; 278 279 switch (cp->type) { 280 case CONSTANT: 281 print_longvar(cp->name, cp->value); 282 break; 283 284 case CONFSTR: 285 errno = 0; 286 slen = confstr((int)cp->value, NULL, 0); 287 if (slen == 0) { 288 if (errno != 0) 289 290 out: err(EXIT_FAILURE, "confstr(%ld)", cp->value); 291 else 292 print_strvar(cp->name, "undefined"); 293 } 294 295 if ((sval = malloc(slen)) == NULL) 296 err(EXIT_FAILURE, "Can't allocate %zu bytes", slen); 297 298 errno = 0; 299 if (confstr((int)cp->value, sval, slen) == 0) { 300 if (errno != 0) 301 goto out; 302 else 303 print_strvar(cp->name, "undefined"); 304 } else 305 print_strvar(cp->name, sval); 306 307 free(sval); 308 break; 309 310 case SYSCONF: 311 errno = 0; 312 if ((val = sysconf((int)cp->value)) == -1) { 313 if (errno != 0) 314 err(EXIT_FAILURE, "sysconf(%ld)", cp->value); 315 print_strvar(cp->name, "undefined"); 316 } else 317 print_longvar(cp->name, val); 318 break; 319 320 case PATHCONF: 321 errno = 0; 322 if ((val = pathconf(pathname, (int)cp->value)) == -1) { 323 if (errno != 0) { 324 if (a_flag && errno == EINVAL) { 325 /* Just skip invalid variables */ 326 return; 327 } 328 err(EXIT_FAILURE, "pathconf(%s, %ld)", 329 pathname, cp->value); 330 /* NOTREACHED */ 331 } 332 333 print_strvar(cp->name, "undefined"); 334 } else 335 print_longvar(cp->name, val); 336 break; 337 } 338 } 339 340 341 static void 342 usage(void) 343 { 344 const char *p = getprogname(); 345 (void)fprintf(stderr, "Usage: %s system_var\n\t%s -a\n" 346 "\t%s path_var pathname\n\t%s -a pathname\n", p, p, p, p); 347 exit(EXIT_FAILURE); 348 } 349
Indexes created Sun Sep 28 16:09:52 GMT 2025