1 /* $NetBSD: getconf.c,v 1.22 2004/11/10 04:02:52 lukem 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 1.22 2004/11/10 04:02:52 lukem 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 int main __P((int, char **)); 54 static void usage __P((void)); 55 56 struct conf_variable 57 { 58 const char *name; 59 enum { SYSCONF, CONFSTR, PATHCONF, CONSTANT } type; 60 long value; 61 }; 62 63 const struct conf_variable conf_table[] = 64 { 65 { "PATH", CONFSTR, _CS_PATH }, 66 67 /* Utility Limit Minimum Values */ 68 { "POSIX2_BC_BASE_MAX", CONSTANT, _POSIX2_BC_BASE_MAX }, 69 { "POSIX2_BC_DIM_MAX", CONSTANT, _POSIX2_BC_DIM_MAX }, 70 { "POSIX2_BC_SCALE_MAX", CONSTANT, _POSIX2_BC_SCALE_MAX }, 71 { "POSIX2_BC_STRING_MAX", CONSTANT, _POSIX2_BC_STRING_MAX }, 72 { "POSIX2_COLL_WEIGHTS_MAX", CONSTANT, _POSIX2_COLL_WEIGHTS_MAX }, 73 { "POSIX2_EXPR_NEST_MAX", CONSTANT, _POSIX2_EXPR_NEST_MAX }, 74 { "POSIX2_LINE_MAX", CONSTANT, _POSIX2_LINE_MAX }, 75 { "POSIX2_RE_DUP_MAX", CONSTANT, _POSIX2_RE_DUP_MAX }, 76 { "POSIX2_VERSION", CONSTANT, _POSIX2_VERSION }, 77 78 /* POSIX.1 Minimum Values */ 79 { "_POSIX_ARG_MAX", CONSTANT, _POSIX_ARG_MAX }, 80 { "_POSIX_CHILD_MAX", CONSTANT, _POSIX_CHILD_MAX }, 81 { "_POSIX_LINK_MAX", CONSTANT, _POSIX_LINK_MAX }, 82 { "_POSIX_MAX_CANON", CONSTANT, _POSIX_MAX_CANON }, 83 { "_POSIX_MAX_INPUT", CONSTANT, _POSIX_MAX_INPUT }, 84 { "_POSIX_NAME_MAX", CONSTANT, _POSIX_NAME_MAX }, 85 { "_POSIX_NGROUPS_MAX", CONSTANT, _POSIX_NGROUPS_MAX }, 86 { "_POSIX_OPEN_MAX", CONSTANT, _POSIX_OPEN_MAX }, 87 { "_POSIX_PATH_MAX", CONSTANT, _POSIX_PATH_MAX }, 88 { "_POSIX_PIPE_BUF", CONSTANT, _POSIX_PIPE_BUF }, 89 { "_POSIX_SSIZE_MAX", CONSTANT, _POSIX_SSIZE_MAX }, 90 { "_POSIX_STREAM_MAX", CONSTANT, _POSIX_STREAM_MAX }, 91 { "_POSIX_TZNAME_MAX", CONSTANT, _POSIX_TZNAME_MAX }, 92 93 /* Symbolic Utility Limits */ 94 { "BC_BASE_MAX", SYSCONF, _SC_BC_BASE_MAX }, 95 { "BC_DIM_MAX", SYSCONF, _SC_BC_DIM_MAX }, 96 { "BC_SCALE_MAX", SYSCONF, _SC_BC_SCALE_MAX }, 97 { "BC_STRING_MAX", SYSCONF, _SC_BC_STRING_MAX }, 98 { "COLL_WEIGHTS_MAX", SYSCONF, _SC_COLL_WEIGHTS_MAX }, 99 { "EXPR_NEST_MAX", SYSCONF, _SC_EXPR_NEST_MAX }, 100 { "LINE_MAX", SYSCONF, _SC_LINE_MAX }, 101 { "RE_DUP_MAX", SYSCONF, _SC_RE_DUP_MAX }, 102 103 /* Optional Facility Configuration Values */ 104 { "POSIX2_C_BIND", SYSCONF, _SC_2_C_BIND }, 105 { "POSIX2_C_DEV", SYSCONF, _SC_2_C_DEV }, 106 { "POSIX2_CHAR_TERM", SYSCONF, _SC_2_CHAR_TERM }, 107 { "POSIX2_FORT_DEV", SYSCONF, _SC_2_FORT_DEV }, 108 { "POSIX2_FORT_RUN", SYSCONF, _SC_2_FORT_RUN }, 109 { "POSIX2_LOCALEDEF", SYSCONF, _SC_2_LOCALEDEF }, 110 { "POSIX2_SW_DEV", SYSCONF, _SC_2_SW_DEV }, 111 { "POSIX2_UPE", SYSCONF, _SC_2_UPE }, 112 113 /* POSIX.1 Configurable System Variables */ 114 { "ARG_MAX", SYSCONF, _SC_ARG_MAX }, 115 { "CHILD_MAX", SYSCONF, _SC_CHILD_MAX }, 116 { "CLK_TCK", SYSCONF, _SC_CLK_TCK }, 117 { "NGROUPS_MAX", SYSCONF, _SC_NGROUPS_MAX }, 118 { "OPEN_MAX", SYSCONF, _SC_OPEN_MAX }, 119 { "STREAM_MAX", SYSCONF, _SC_STREAM_MAX }, 120 { "TZNAME_MAX", SYSCONF, _SC_TZNAME_MAX }, 121 { "_POSIX_JOB_CONTROL", SYSCONF, _SC_JOB_CONTROL }, 122 { "_POSIX_SAVED_IDS", SYSCONF, _SC_SAVED_IDS }, 123 { "_POSIX_VERSION", SYSCONF, _SC_VERSION }, 124 125 { "LINK_MAX", PATHCONF, _PC_LINK_MAX }, 126 { "MAX_CANON", PATHCONF, _PC_MAX_CANON }, 127 { "MAX_INPUT", PATHCONF, _PC_MAX_INPUT }, 128 { "NAME_MAX", PATHCONF, _PC_NAME_MAX }, 129 { "PATH_MAX", PATHCONF, _PC_PATH_MAX }, 130 { "PIPE_BUF", PATHCONF, _PC_PIPE_BUF }, 131 { "_POSIX_CHOWN_RESTRICTED", PATHCONF, _PC_CHOWN_RESTRICTED }, 132 { "_POSIX_NO_TRUNC", PATHCONF, _PC_NO_TRUNC }, 133 { "_POSIX_VDISABLE", PATHCONF, _PC_VDISABLE }, 134 135 /* POSIX.1b Configurable System Variables */ 136 { "PAGESIZE", SYSCONF, _SC_PAGESIZE }, 137 { "_POSIX_FSYNC", SYSCONF, _SC_FSYNC }, 138 { "_POSIX_MAPPED_FILES", SYSCONF, _SC_MAPPED_FILES }, 139 { "_POSIX_MEMLOCK", SYSCONF, _SC_MEMLOCK }, 140 { "_POSIX_MEMLOCK_RANGE", SYSCONF, _SC_MEMLOCK_RANGE }, 141 { "_POSIX_MEMORY_PROTECTION", SYSCONF, _SC_MEMORY_PROTECTION }, 142 { "_POSIX_MONOTONIC_CLOCK", SYSCONF, _SC_MONOTONIC_CLOCK }, 143 { "_POSIX_SEMAPHORES", SYSCONF, _SC_SEMAPHORES }, 144 { "_POSIX_SYNCHRONIZED_IO", SYSCONF, _SC_SYNCHRONIZED_IO }, 145 { "_POSIX_TIMERS", SYSCONF, _SC_TIMERS }, 146 147 { "_POSIX_SYNC_IO", PATHCONF, _PC_SYNC_IO }, 148 149 /* POSIX.1c Configurable System Variables */ 150 { "LOGIN_NAME_MAX", SYSCONF, _SC_LOGIN_NAME_MAX }, 151 { "_POSIX_THREADS", SYSCONF, _SC_THREADS }, 152 153 /* POSIX.1j Configurable System Variables */ 154 { "_POSIX_BARRIERS", SYSCONF, _SC_BARRIERS }, 155 { "_POSIX_READER_WRITER_LOCKS", SYSCONF, _SC_READER_WRITER_LOCKS }, 156 { "_POSIX_SPIN_LOCKS", SYSCONF, _SC_SPIN_LOCKS }, 157 158 /* XPG4.2 Configurable System Variables */ 159 { "IOV_MAX", SYSCONF, _SC_IOV_MAX }, 160 { "PAGE_SIZE", SYSCONF, _SC_PAGE_SIZE }, 161 { "_XOPEN_SHM", SYSCONF, _SC_XOPEN_SHM }, 162 163 /* X/Open CAE Spec. Issue 5 Version 2 Configurable System Variables */ 164 { "FILESIZEBITS", PATHCONF, _PC_FILESIZEBITS }, 165 166 /* POSIX.1-2001 XSI Option Group Configurable System Variables */ 167 { "ATEXIT_MAX", SYSCONF, _SC_ATEXIT_MAX }, 168 169 /* POSIX.1-2001 TSF Configurable System Variables */ 170 { "GETGR_R_SIZE_MAX", SYSCONF, _SC_GETGR_R_SIZE_MAX }, 171 { "GETPW_R_SIZE_MAX", SYSCONF, _SC_GETPW_R_SIZE_MAX }, 172 173 { NULL } 174 }; 175 176 177 int 178 main(argc, argv) 179 int argc; 180 char **argv; 181 { 182 int ch; 183 const struct conf_variable *cp; 184 185 long val; 186 size_t slen; 187 char * sval; 188 189 setlocale(LC_ALL, ""); 190 191 while ((ch = getopt(argc, argv, "")) != -1) { 192 switch (ch) { 193 case '?': 194 default: 195 usage(); 196 } 197 } 198 argc -= optind; 199 argv += optind; 200 201 if (argc < 1 || argc > 2) { 202 usage(); 203 /* NOTREACHED */ 204 } 205 206 for (cp = conf_table; cp->name != NULL; cp++) { 207 if (strcmp(*argv, cp->name) == 0) 208 break; 209 } 210 if (cp->name == NULL) { 211 errx(1, "%s: unknown variable", *argv); 212 /* NOTREACHED */ 213 } 214 215 if (cp->type == PATHCONF) { 216 if (argc != 2) usage(); 217 } else { 218 if (argc != 1) usage(); 219 } 220 221 switch (cp->type) { 222 case CONSTANT: 223 printf("%ld\n", cp->value); 224 break; 225 226 case CONFSTR: 227 slen = confstr (cp->value, (char *) 0, (size_t) 0); 228 229 if ((sval = malloc(slen)) == NULL) 230 err(1, "malloc"); 231 232 confstr(cp->value, sval, slen); 233 printf("%s\n", sval); 234 break; 235 236 case SYSCONF: 237 errno = 0; 238 if ((val = sysconf(cp->value)) == -1) { 239 if (errno != 0) { 240 err(1, "sysconf"); 241 /* NOTREACHED */ 242 } 243 244 printf ("undefined\n"); 245 } else { 246 printf("%ld\n", val); 247 } 248 break; 249 250 case PATHCONF: 251 errno = 0; 252 if ((val = pathconf(argv[1], cp->value)) == -1) { 253 if (errno != 0) { 254 err(1, "%s", argv[1]); 255 /* NOTREACHED */ 256 } 257 258 printf ("undefined\n"); 259 } else { 260 printf ("%ld\n", val); 261 } 262 break; 263 } 264 265 exit (ferror(stdout)); 266 } 267 268 269 static void 270 usage() 271 { 272 fprintf (stderr, "usage: getconf system_var\n"); 273 fprintf (stderr, " getconf path_var pathname\n"); 274 exit(1); 275 } 276