1 /* $OpenBSD: getconf.c,v 1.5 2001/07/12 05:17:08 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 #ifndef lint 44 static char rcsid[] = "$OpenBSD: getconf.c,v 1.5 2001/07/12 05:17:08 deraadt Exp $"; 45 #endif /* not lint */ 46 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <limits.h> 50 #include <locale.h> 51 #include <unistd.h> 52 #include <err.h> 53 #include <errno.h> 54 55 static void usage __P((void)); 56 57 struct conf_variable 58 { 59 const char *name; 60 enum { SYSCONF, CONFSTR, PATHCONF, CONSTANT } type; 61 long value; 62 }; 63 64 const struct conf_variable conf_table[] = 65 { 66 { "PATH", CONFSTR, _CS_PATH }, 67 68 /* Utility Limit Minimum Values */ 69 { "POSIX2_BC_BASE_MAX", CONSTANT, _POSIX2_BC_BASE_MAX }, 70 { "POSIX2_BC_DIM_MAX", CONSTANT, _POSIX2_BC_DIM_MAX }, 71 { "POSIX2_BC_SCALE_MAX", CONSTANT, _POSIX2_BC_SCALE_MAX }, 72 { "POSIX2_BC_STRING_MAX", CONSTANT, _POSIX2_BC_STRING_MAX }, 73 { "POSIX2_COLL_WEIGHTS_MAX", CONSTANT, _POSIX2_COLL_WEIGHTS_MAX }, 74 { "POSIX2_EXPR_NEST_MAX", CONSTANT, _POSIX2_EXPR_NEST_MAX }, 75 { "POSIX2_LINE_MAX", CONSTANT, _POSIX2_LINE_MAX }, 76 { "POSIX2_RE_DUP_MAX", CONSTANT, _POSIX2_RE_DUP_MAX }, 77 { "POSIX2_VERSION", CONSTANT, _POSIX2_VERSION }, 78 79 /* POSIX.1 Minimum Values */ 80 { "_POSIX_ARG_MAX", CONSTANT, _POSIX_ARG_MAX }, 81 { "_POSIX_CHILD_MAX", CONSTANT, _POSIX_CHILD_MAX }, 82 { "_POSIX_LINK_MAX", CONSTANT, _POSIX_LINK_MAX }, 83 { "_POSIX_MAX_CANON", CONSTANT, _POSIX_MAX_CANON }, 84 { "_POSIX_MAX_INPUT", CONSTANT, _POSIX_MAX_INPUT }, 85 { "_POSIX_NAME_MAX", CONSTANT, _POSIX_NAME_MAX }, 86 { "_POSIX_NGROUPS_MAX", CONSTANT, _POSIX_NGROUPS_MAX }, 87 { "_POSIX_OPEN_MAX", CONSTANT, _POSIX_OPEN_MAX }, 88 { "_POSIX_PATH_MAX", CONSTANT, _POSIX_PIPE_BUF }, 89 { "_POSIX_PIPE_BUF", CONSTANT, _POSIX_PIPE_BUF }, 90 { "_POSIX_SSIZE_MAX", CONSTANT, _POSIX_SSIZE_MAX }, 91 { "_POSIX_STREAM_MAX", CONSTANT, _POSIX_STREAM_MAX }, 92 { "_POSIX_TZNAME_MAX", CONSTANT, _POSIX_TZNAME_MAX }, 93 94 /* Symbolic Utility Limits */ 95 { "BC_BASE_MAX", SYSCONF, _SC_BC_BASE_MAX }, 96 { "BC_DIM_MAX", SYSCONF, _SC_BC_DIM_MAX }, 97 { "BC_SCALE_MAX", SYSCONF, _SC_BC_SCALE_MAX }, 98 { "BC_STRING_MAX", SYSCONF, _SC_BC_STRING_MAX }, 99 { "COLL_WEIGHTS_MAX", SYSCONF, _SC_COLL_WEIGHTS_MAX }, 100 { "EXPR_NEST_MAX", SYSCONF, _SC_EXPR_NEST_MAX }, 101 { "LINE_MAX", SYSCONF, _SC_LINE_MAX }, 102 { "RE_DUP_MAX", SYSCONF, _SC_RE_DUP_MAX }, 103 104 /* Optional Facility Configuration Values */ 105 #if 0 106 { "POSIX2_C_BIND", SYSCONF, ??? }, 107 #endif 108 { "POSIX2_C_DEV", SYSCONF, _SC_2_C_DEV }, 109 { "POSIX2_CHAR_TERM", SYSCONF, _SC_2_CHAR_TERM }, 110 { "POSIX2_FORT_DEV", SYSCONF, _SC_2_FORT_DEV }, 111 { "POSIX2_FORT_RUN", SYSCONF, _SC_2_FORT_RUN }, 112 { "POSIX2_LOCALEDEF", SYSCONF, _SC_2_LOCALEDEF }, 113 { "POSIX2_SW_DEV", SYSCONF, _SC_2_SW_DEV }, 114 { "POSIX2_UPE", SYSCONF, _SC_2_UPE }, 115 116 /* POSIX.1 Configurable System Variables */ 117 { "ARG_MAX", SYSCONF, _SC_ARG_MAX }, 118 { "CHILD_MAX", SYSCONF, _SC_CHILD_MAX }, 119 { "CLK_TCK", SYSCONF, _SC_CLK_TCK }, 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 { NULL } 139 }; 140 141 142 int 143 main(argc, argv) 144 int argc; 145 char **argv; 146 { 147 int ch; 148 const struct conf_variable *cp; 149 150 long val; 151 size_t slen; 152 char * sval; 153 154 setlocale(LC_ALL, ""); 155 156 while ((ch = getopt(argc, argv, "")) != -1) { 157 switch (ch) { 158 case '?': 159 default: 160 usage(); 161 } 162 } 163 argc -= optind; 164 argv += optind; 165 166 if (argc < 1 || argc > 2) { 167 usage(); 168 /* NOTREACHED */ 169 } 170 171 for (cp = conf_table; cp->name != NULL; cp++) { 172 if (strcmp(*argv, cp->name) == 0) 173 break; 174 } 175 if (cp->name == NULL) { 176 errx(1, "%s: unknown variable", *argv); 177 /* NOTREACHED */ 178 } 179 180 if (cp->type == PATHCONF) { 181 if (argc != 2) usage(); 182 } else { 183 if (argc != 1) usage(); 184 } 185 186 switch (cp->type) { 187 case CONSTANT: 188 printf("%ld\n", cp->value); 189 break; 190 191 case CONFSTR: 192 slen = confstr (cp->value, (char *) 0, (size_t) 0); 193 194 if ((sval = malloc(slen)) == NULL) 195 err(1, NULL); 196 197 confstr(cp->value, sval, slen); 198 printf("%s\n", sval); 199 break; 200 201 case SYSCONF: 202 errno = 0; 203 if ((val = sysconf(cp->value)) == -1) { 204 if (errno != 0) { 205 err(1, NULL); 206 /* NOTREACHED */ 207 } 208 209 printf ("undefined\n"); 210 } else { 211 printf("%ld\n", val); 212 } 213 break; 214 215 case PATHCONF: 216 errno = 0; 217 if ((val = pathconf(argv[1], cp->value)) == -1) { 218 if (errno != 0) { 219 err(1, "%s", argv[1]); 220 /* NOTREACHED */ 221 } 222 223 printf ("undefined\n"); 224 } else { 225 printf ("%ld\n", val); 226 } 227 break; 228 } 229 230 exit (ferror(stdout)); 231 } 232 233 234 static void 235 usage() 236 { 237 extern char *__progname; 238 239 (void)fprintf(stderr, "usage: %s name [pathname]\n", __progname); 240 exit(1); 241 } 242