1 /* $OpenBSD: getconf.c,v 1.11 2008/11/08 01:29:10 chl 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 1.11 2008/11/08 01:29:10 chl Exp $"; 45 #endif /* not lint */ 46 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 #include <limits.h> 51 #include <locale.h> 52 #include <unistd.h> 53 #include <err.h> 54 #include <errno.h> 55 56 static void usage(void); 57 58 struct conf_variable 59 { 60 const char *name; 61 enum { SYSCONF, CONFSTR, PATHCONF, CONSTANT } type; 62 long value; 63 }; 64 65 const struct conf_variable conf_table[] = 66 { 67 { "PATH", CONFSTR, _CS_PATH }, 68 69 /* Utility Limit Minimum Values */ 70 { "POSIX2_BC_BASE_MAX", CONSTANT, _POSIX2_BC_BASE_MAX }, 71 { "POSIX2_BC_DIM_MAX", CONSTANT, _POSIX2_BC_DIM_MAX }, 72 { "POSIX2_BC_SCALE_MAX", CONSTANT, _POSIX2_BC_SCALE_MAX }, 73 { "POSIX2_BC_STRING_MAX", CONSTANT, _POSIX2_BC_STRING_MAX }, 74 { "POSIX2_COLL_WEIGHTS_MAX", CONSTANT, _POSIX2_COLL_WEIGHTS_MAX }, 75 { "POSIX2_EXPR_NEST_MAX", CONSTANT, _POSIX2_EXPR_NEST_MAX }, 76 { "POSIX2_LINE_MAX", CONSTANT, _POSIX2_LINE_MAX }, 77 { "POSIX2_RE_DUP_MAX", CONSTANT, _POSIX2_RE_DUP_MAX }, 78 { "POSIX2_VERSION", CONSTANT, _POSIX2_VERSION }, 79 80 /* POSIX.1 Minimum Values */ 81 { "_POSIX_ARG_MAX", CONSTANT, _POSIX_ARG_MAX }, 82 { "_POSIX_CHILD_MAX", CONSTANT, _POSIX_CHILD_MAX }, 83 { "_POSIX_LINK_MAX", CONSTANT, _POSIX_LINK_MAX }, 84 { "_POSIX_MAX_CANON", CONSTANT, _POSIX_MAX_CANON }, 85 { "_POSIX_MAX_INPUT", CONSTANT, _POSIX_MAX_INPUT }, 86 { "_POSIX_NAME_MAX", CONSTANT, _POSIX_NAME_MAX }, 87 { "_POSIX_NGROUPS_MAX", CONSTANT, _POSIX_NGROUPS_MAX }, 88 { "_POSIX_OPEN_MAX", CONSTANT, _POSIX_OPEN_MAX }, 89 { "_POSIX_PATH_MAX", CONSTANT, _POSIX_PATH_MAX }, 90 { "_POSIX_PIPE_BUF", CONSTANT, _POSIX_PIPE_BUF }, 91 { "_POSIX_SSIZE_MAX", CONSTANT, _POSIX_SSIZE_MAX }, 92 { "_POSIX_STREAM_MAX", CONSTANT, _POSIX_STREAM_MAX }, 93 { "_POSIX_TZNAME_MAX", CONSTANT, _POSIX_TZNAME_MAX }, 94 95 /* Symbolic Utility Limits */ 96 { "BC_BASE_MAX", SYSCONF, _SC_BC_BASE_MAX }, 97 { "BC_DIM_MAX", SYSCONF, _SC_BC_DIM_MAX }, 98 { "BC_SCALE_MAX", SYSCONF, _SC_BC_SCALE_MAX }, 99 { "BC_STRING_MAX", SYSCONF, _SC_BC_STRING_MAX }, 100 { "COLL_WEIGHTS_MAX", SYSCONF, _SC_COLL_WEIGHTS_MAX }, 101 { "EXPR_NEST_MAX", SYSCONF, _SC_EXPR_NEST_MAX }, 102 { "LINE_MAX", SYSCONF, _SC_LINE_MAX }, 103 { "RE_DUP_MAX", SYSCONF, _SC_RE_DUP_MAX }, 104 105 /* Optional Facility Configuration Values */ 106 #if 0 107 { "POSIX2_C_BIND", SYSCONF, ??? }, 108 #endif 109 { "POSIX2_C_DEV", SYSCONF, _SC_2_C_DEV }, 110 { "POSIX2_CHAR_TERM", SYSCONF, _SC_2_CHAR_TERM }, 111 { "POSIX2_FORT_DEV", SYSCONF, _SC_2_FORT_DEV }, 112 { "POSIX2_FORT_RUN", SYSCONF, _SC_2_FORT_RUN }, 113 { "POSIX2_LOCALEDEF", SYSCONF, _SC_2_LOCALEDEF }, 114 { "POSIX2_SW_DEV", SYSCONF, _SC_2_SW_DEV }, 115 { "POSIX2_UPE", SYSCONF, _SC_2_UPE }, 116 117 /* POSIX.1 Configurable System Variables */ 118 { "ARG_MAX", SYSCONF, _SC_ARG_MAX }, 119 { "CHILD_MAX", SYSCONF, _SC_CHILD_MAX }, 120 { "CLK_TCK", SYSCONF, _SC_CLK_TCK }, 121 { "NGROUPS_MAX", SYSCONF, _SC_NGROUPS_MAX }, 122 { "OPEN_MAX", SYSCONF, _SC_OPEN_MAX }, 123 { "STREAM_MAX", SYSCONF, _SC_STREAM_MAX }, 124 { "TZNAME_MAX", SYSCONF, _SC_TZNAME_MAX }, 125 { "_POSIX_JOB_CONTROL", SYSCONF, _SC_JOB_CONTROL }, 126 { "_POSIX_SAVED_IDS", SYSCONF, _SC_SAVED_IDS }, 127 { "_POSIX_VERSION", SYSCONF, _SC_VERSION }, 128 129 { "LINK_MAX", PATHCONF, _PC_LINK_MAX }, 130 { "MAX_CANON", PATHCONF, _PC_MAX_CANON }, 131 { "MAX_INPUT", PATHCONF, _PC_MAX_INPUT }, 132 { "NAME_MAX", PATHCONF, _PC_NAME_MAX }, 133 { "PATH_MAX", PATHCONF, _PC_PATH_MAX }, 134 { "PIPE_BUF", PATHCONF, _PC_PIPE_BUF }, 135 { "_POSIX_CHOWN_RESTRICTED", PATHCONF, _PC_CHOWN_RESTRICTED }, 136 { "_POSIX_NO_TRUNC", PATHCONF, _PC_NO_TRUNC }, 137 { "_POSIX_VDISABLE", PATHCONF, _PC_VDISABLE }, 138 139 { NULL } 140 }; 141 142 143 int 144 main(int argc, char *argv[]) 145 { 146 int ch; 147 const struct conf_variable *cp; 148 149 long val; 150 size_t slen; 151 char * sval; 152 153 setlocale(LC_ALL, ""); 154 155 while ((ch = getopt(argc, argv, "")) != -1) { 156 switch (ch) { 157 case '?': 158 default: 159 usage(); 160 } 161 } 162 argc -= optind; 163 argv += optind; 164 165 if (argc < 1 || argc > 2) { 166 usage(); 167 /* NOTREACHED */ 168 } 169 170 for (cp = conf_table; cp->name != NULL; cp++) { 171 if (strcmp(*argv, cp->name) == 0) 172 break; 173 } 174 if (cp->name == NULL) { 175 errx(1, "%s: unknown variable", *argv); 176 /* NOTREACHED */ 177 } 178 179 if (cp->type == PATHCONF) { 180 if (argc != 2) usage(); 181 } else { 182 if (argc != 1) usage(); 183 } 184 185 switch (cp->type) { 186 case CONSTANT: 187 printf("%ld\n", cp->value); 188 break; 189 190 case CONFSTR: 191 errno = 0; 192 slen = confstr (cp->value, (char *) 0, (size_t) 0); 193 194 if (slen == 0 || slen == (size_t)-1) { 195 if (errno) 196 err(1, "%ld", cp->value); 197 else 198 errx(1, "%ld", cp->value); 199 } 200 if ((sval = malloc(slen)) == NULL) 201 err(1, NULL); 202 203 confstr(cp->value, sval, slen); 204 printf("%s\n", sval); 205 break; 206 207 case SYSCONF: 208 errno = 0; 209 if ((val = sysconf(cp->value)) == -1) { 210 if (errno != 0) { 211 err(1, NULL); 212 /* NOTREACHED */ 213 } 214 215 printf ("undefined\n"); 216 } else { 217 printf("%ld\n", val); 218 } 219 break; 220 221 case PATHCONF: 222 errno = 0; 223 if ((val = pathconf(argv[1], cp->value)) == -1) { 224 if (errno != 0) { 225 err(1, "%s", argv[1]); 226 /* NOTREACHED */ 227 } 228 229 printf ("undefined\n"); 230 } else { 231 printf ("%ld\n", val); 232 } 233 break; 234 } 235 236 exit (ferror(stdout)); 237 } 238 239 240 static void 241 usage(void) 242 { 243 extern char *__progname; 244 245 (void)fprintf(stderr, "usage: %s name [pathname]\n", __progname); 246 exit(1); 247 } 248