1 /* $OpenBSD: getconf.c,v 1.12 2009/10/27 23:59:38 deraadt Exp $ */ 2 3 /*- 4 * Copyright (c) 1996 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 Winning Strategies, Inc. 21 * 4. The name of the author may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 33 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 /* 37 * POSIX.2 getconf utility 38 * 39 * Written by: 40 * J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc. 41 */ 42 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <string.h> 46 #include <limits.h> 47 #include <locale.h> 48 #include <unistd.h> 49 #include <err.h> 50 #include <errno.h> 51 52 static void usage(void); 53 54 struct conf_variable 55 { 56 const char *name; 57 enum { SYSCONF, CONFSTR, PATHCONF, CONSTANT } type; 58 long value; 59 }; 60 61 const struct conf_variable conf_table[] = 62 { 63 { "PATH", CONFSTR, _CS_PATH }, 64 65 /* Utility Limit Minimum Values */ 66 { "POSIX2_BC_BASE_MAX", CONSTANT, _POSIX2_BC_BASE_MAX }, 67 { "POSIX2_BC_DIM_MAX", CONSTANT, _POSIX2_BC_DIM_MAX }, 68 { "POSIX2_BC_SCALE_MAX", CONSTANT, _POSIX2_BC_SCALE_MAX }, 69 { "POSIX2_BC_STRING_MAX", CONSTANT, _POSIX2_BC_STRING_MAX }, 70 { "POSIX2_COLL_WEIGHTS_MAX", CONSTANT, _POSIX2_COLL_WEIGHTS_MAX }, 71 { "POSIX2_EXPR_NEST_MAX", CONSTANT, _POSIX2_EXPR_NEST_MAX }, 72 { "POSIX2_LINE_MAX", CONSTANT, _POSIX2_LINE_MAX }, 73 { "POSIX2_RE_DUP_MAX", CONSTANT, _POSIX2_RE_DUP_MAX }, 74 { "POSIX2_VERSION", CONSTANT, _POSIX2_VERSION }, 75 76 /* POSIX.1 Minimum Values */ 77 { "_POSIX_ARG_MAX", CONSTANT, _POSIX_ARG_MAX }, 78 { "_POSIX_CHILD_MAX", CONSTANT, _POSIX_CHILD_MAX }, 79 { "_POSIX_LINK_MAX", CONSTANT, _POSIX_LINK_MAX }, 80 { "_POSIX_MAX_CANON", CONSTANT, _POSIX_MAX_CANON }, 81 { "_POSIX_MAX_INPUT", CONSTANT, _POSIX_MAX_INPUT }, 82 { "_POSIX_NAME_MAX", CONSTANT, _POSIX_NAME_MAX }, 83 { "_POSIX_NGROUPS_MAX", CONSTANT, _POSIX_NGROUPS_MAX }, 84 { "_POSIX_OPEN_MAX", CONSTANT, _POSIX_OPEN_MAX }, 85 { "_POSIX_PATH_MAX", CONSTANT, _POSIX_PATH_MAX }, 86 { "_POSIX_PIPE_BUF", CONSTANT, _POSIX_PIPE_BUF }, 87 { "_POSIX_SSIZE_MAX", CONSTANT, _POSIX_SSIZE_MAX }, 88 { "_POSIX_STREAM_MAX", CONSTANT, _POSIX_STREAM_MAX }, 89 { "_POSIX_TZNAME_MAX", CONSTANT, _POSIX_TZNAME_MAX }, 90 91 /* Symbolic Utility Limits */ 92 { "BC_BASE_MAX", SYSCONF, _SC_BC_BASE_MAX }, 93 { "BC_DIM_MAX", SYSCONF, _SC_BC_DIM_MAX }, 94 { "BC_SCALE_MAX", SYSCONF, _SC_BC_SCALE_MAX }, 95 { "BC_STRING_MAX", SYSCONF, _SC_BC_STRING_MAX }, 96 { "COLL_WEIGHTS_MAX", SYSCONF, _SC_COLL_WEIGHTS_MAX }, 97 { "EXPR_NEST_MAX", SYSCONF, _SC_EXPR_NEST_MAX }, 98 { "LINE_MAX", SYSCONF, _SC_LINE_MAX }, 99 { "RE_DUP_MAX", SYSCONF, _SC_RE_DUP_MAX }, 100 101 /* Optional Facility Configuration Values */ 102 #if 0 103 { "POSIX2_C_BIND", SYSCONF, ??? }, 104 #endif 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 { NULL } 136 }; 137 138 139 int 140 main(int argc, char *argv[]) 141 { 142 int ch; 143 const struct conf_variable *cp; 144 145 long val; 146 size_t slen; 147 char * sval; 148 149 setlocale(LC_ALL, ""); 150 151 while ((ch = getopt(argc, argv, "")) != -1) { 152 switch (ch) { 153 case '?': 154 default: 155 usage(); 156 } 157 } 158 argc -= optind; 159 argv += optind; 160 161 if (argc < 1 || argc > 2) { 162 usage(); 163 /* NOTREACHED */ 164 } 165 166 for (cp = conf_table; cp->name != NULL; cp++) { 167 if (strcmp(*argv, cp->name) == 0) 168 break; 169 } 170 if (cp->name == NULL) { 171 errx(1, "%s: unknown variable", *argv); 172 /* NOTREACHED */ 173 } 174 175 if (cp->type == PATHCONF) { 176 if (argc != 2) usage(); 177 } else { 178 if (argc != 1) usage(); 179 } 180 181 switch (cp->type) { 182 case CONSTANT: 183 printf("%ld\n", cp->value); 184 break; 185 186 case CONFSTR: 187 errno = 0; 188 slen = confstr (cp->value, (char *) 0, (size_t) 0); 189 190 if (slen == 0 || slen == (size_t)-1) { 191 if (errno) 192 err(1, "%ld", cp->value); 193 else 194 errx(1, "%ld", cp->value); 195 } 196 if ((sval = malloc(slen)) == NULL) 197 err(1, NULL); 198 199 confstr(cp->value, sval, slen); 200 printf("%s\n", sval); 201 break; 202 203 case SYSCONF: 204 errno = 0; 205 if ((val = sysconf(cp->value)) == -1) { 206 if (errno != 0) { 207 err(1, NULL); 208 /* NOTREACHED */ 209 } 210 211 printf ("undefined\n"); 212 } else { 213 printf("%ld\n", val); 214 } 215 break; 216 217 case PATHCONF: 218 errno = 0; 219 if ((val = pathconf(argv[1], cp->value)) == -1) { 220 if (errno != 0) { 221 err(1, "%s", argv[1]); 222 /* NOTREACHED */ 223 } 224 225 printf ("undefined\n"); 226 } else { 227 printf ("%ld\n", val); 228 } 229 break; 230 } 231 232 exit (ferror(stdout)); 233 } 234 235 236 static void 237 usage(void) 238 { 239 extern char *__progname; 240 241 (void)fprintf(stderr, "usage: %s name [pathname]\n", __progname); 242 exit(1); 243 } 244