1 /* $NetBSD: getconf.c,v 1.4 1997/01/09 20:19:44 tls 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 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 REGENTS OR CONTRIBUTORS BE 30 * 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 #ifndef lint 40 static char rcsid[] = "$NetBSD: getconf.c,v 1.4 1997/01/09 20:19:44 tls Exp $"; 41 #endif /* not lint */ 42 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <limits.h> 46 #include <locale.h> 47 #include <unistd.h> 48 #include <errno.h> 49 50 static void usage __P((void)); 51 52 struct conf_variable 53 { 54 const char *name; 55 enum { SYSCONF, CONFSTR, PATHCONF, CONSTANT } type; 56 long value; 57 }; 58 59 const struct conf_variable conf_table[] = 60 { 61 { "PATH", CONFSTR, _CS_PATH }, 62 63 /* Utility Limit Minimum Values */ 64 { "POSIX2_BC_BASE_MAX", CONSTANT, _POSIX2_BC_BASE_MAX }, 65 { "POSIX2_BC_DIM_MAX", CONSTANT, _POSIX2_BC_DIM_MAX }, 66 { "POSIX2_BC_SCALE_MAX", CONSTANT, _POSIX2_BC_SCALE_MAX }, 67 { "POSIX2_BC_STRING_MAX", CONSTANT, _POSIX2_BC_STRING_MAX }, 68 { "POSIX2_COLL_WEIGHTS_MAX", CONSTANT, _POSIX2_COLL_WEIGHTS_MAX }, 69 { "POSIX2_EXPR_NEST_MAX", CONSTANT, _POSIX2_EXPR_NEST_MAX }, 70 { "POSIX2_LINE_MAX", CONSTANT, _POSIX2_LINE_MAX }, 71 { "POSIX2_RE_DUP_MAX", CONSTANT, _POSIX2_RE_DUP_MAX }, 72 { "POSIX2_VERSION", CONSTANT, _POSIX2_VERSION }, 73 74 /* POSIX.1 Minimum Values */ 75 { "_POSIX_ARG_MAX", CONSTANT, _POSIX_ARG_MAX }, 76 { "_POSIX_CHILD_MAX", CONSTANT, _POSIX_CHILD_MAX }, 77 { "_POSIX_LINK_MAX", CONSTANT, _POSIX_LINK_MAX }, 78 { "_POSIX_MAX_CANON", CONSTANT, _POSIX_MAX_CANON }, 79 { "_POSIX_MAX_INPUT", CONSTANT, _POSIX_MAX_INPUT }, 80 { "_POSIX_NAME_MAX", CONSTANT, _POSIX_NAME_MAX }, 81 { "_POSIX_NGROUPS_MAX", CONSTANT, _POSIX_NGROUPS_MAX }, 82 { "_POSIX_OPEN_MAX", CONSTANT, _POSIX_OPEN_MAX }, 83 { "_POSIX_PATH_MAX", CONSTANT, _POSIX_PIPE_BUF }, 84 { "_POSIX_PIPE_BUF", CONSTANT, _POSIX_PIPE_BUF }, 85 { "_POSIX_SSIZE_MAX", CONSTANT, _POSIX_SSIZE_MAX }, 86 { "_POSIX_STREAM_MAX", CONSTANT, _POSIX_STREAM_MAX }, 87 { "_POSIX_TZNAME_MAX", CONSTANT, _POSIX_TZNAME_MAX }, 88 89 /* Symbolic Utility Limits */ 90 { "BC_BASE_MAX", SYSCONF, _SC_BC_BASE_MAX }, 91 { "BC_DIM_MAX", SYSCONF, _SC_BC_DIM_MAX }, 92 { "BC_SCALE_MAX", SYSCONF, _SC_BC_SCALE_MAX }, 93 { "BC_STRING_MAX", SYSCONF, _SC_BC_STRING_MAX }, 94 { "COLL_WEIGHTS_MAX", SYSCONF, _SC_COLL_WEIGHTS_MAX }, 95 { "EXPR_NEST_MAX", SYSCONF, _SC_EXPR_NEST_MAX }, 96 { "LINE_MAX", SYSCONF, _SC_LINE_MAX }, 97 { "RE_DUP_MAX", SYSCONF, _SC_RE_DUP_MAX }, 98 99 /* Optional Facility Configuration Values */ 100 #if 0 101 { "POSIX2_C_BIND", SYSCONF, ??? }, 102 #endif 103 { "POSIX2_C_DEV", SYSCONF, _SC_2_C_DEV }, 104 { "POSIX2_CHAR_TERM", SYSCONF, _SC_2_CHAR_TERM }, 105 { "POSIX2_FORT_DEV", SYSCONF, _SC_2_FORT_DEV }, 106 { "POSIX2_FORT_RUN", SYSCONF, _SC_2_FORT_RUN }, 107 { "POSIX2_LOCALEDEF", SYSCONF, _SC_2_LOCALEDEF }, 108 { "POSIX2_SW_DEV", SYSCONF, _SC_2_SW_DEV }, 109 { "POSIX2_UPE", SYSCONF, _SC_2_UPE }, 110 111 /* POSIX.1 Configurable System Variables */ 112 { "ARG_MAX", SYSCONF, _SC_ARG_MAX }, 113 { "CHILD_MAX", SYSCONF, _SC_CHILD_MAX }, 114 { "CLK_TCK", SYSCONF, _SC_CLK_TCK }, 115 { "NGROUPS_MAX", SYSCONF, _SC_NGROUPS_MAX }, 116 { "OPEN_MAX", SYSCONF, _SC_OPEN_MAX }, 117 { "STREAM_MAX", SYSCONF, _SC_STREAM_MAX }, 118 { "TZNAME_MAX", SYSCONF, _SC_TZNAME_MAX }, 119 { "_POSIX_JOB_CONTROL", SYSCONF, _SC_JOB_CONTROL }, 120 { "_POSIX_SAVED_IDS", SYSCONF, _SC_SAVED_IDS }, 121 { "_POSIX_VERSION", SYSCONF, _SC_VERSION }, 122 123 { "LINK_MAX", PATHCONF, _PC_LINK_MAX }, 124 { "MAX_CANON", PATHCONF, _PC_MAX_CANON }, 125 { "MAX_INPUT", PATHCONF, _PC_MAX_INPUT }, 126 { "NAME_MAX", PATHCONF, _PC_NAME_MAX }, 127 { "PATH_MAX", PATHCONF, _PC_PATH_MAX }, 128 { "PIPE_BUF", PATHCONF, _PC_PIPE_BUF }, 129 { "_POSIX_CHOWN_RESTRICTED", PATHCONF, _PC_CHOWN_RESTRICTED }, 130 { "_POSIX_NO_TRUNC", PATHCONF, _PC_NO_TRUNC }, 131 { "_POSIX_VDISABLE", PATHCONF, _PC_VDISABLE }, 132 133 { NULL } 134 }; 135 136 137 int 138 main(argc, argv) 139 int argc; 140 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 slen = confstr (cp->value, (char *) 0, (size_t) 0); 188 189 if ((sval = malloc(slen)) == NULL) 190 err(1, NULL); 191 192 confstr(cp->value, sval, slen); 193 printf("%s\n", sval); 194 break; 195 196 case SYSCONF: 197 errno = 0; 198 if ((val = sysconf(cp->value)) == -1) { 199 if (errno != 0) { 200 err(1, NULL); 201 /* NOTREACHED */ 202 } 203 204 printf ("undefined\n"); 205 } else { 206 printf("%ld\n", val); 207 } 208 break; 209 210 case PATHCONF: 211 errno = 0; 212 if ((val = pathconf(argv[1], cp->value)) == -1) { 213 if (errno != 0) { 214 err(1, "%s", argv[1]); 215 /* NOTREACHED */ 216 } 217 218 printf ("undefined\n"); 219 } else { 220 printf ("%ld\n", val); 221 } 222 break; 223 } 224 225 exit (ferror(stdout)); 226 } 227 228 229 static void 230 usage() 231 { 232 fprintf (stderr, "usage: getconf system_var\n"); 233 fprintf (stderr, " getconf path_var pathname\n"); 234 exit(1); 235 } 236