1 /* 2 * Copyright (c) 1994 Winning Strategies, Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by Winning Strategies, Inc. 16 * 4. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 /* 32 * POSIX.2 getconf utility 33 * 34 * Written by: 35 * J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc. 36 */ 37 38 #ifndef lint 39 static char rcsid[] = "$Id: getconf.c,v 1.2 1994/05/10 00:04:12 jtc Exp $"; 40 #endif /* not lint */ 41 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <limits.h> 45 #include <locale.h> 46 #include <unistd.h> 47 #include <errno.h> 48 49 static void usage __P((void)); 50 51 struct conf_variable 52 { 53 const char *name; 54 enum { SYSCONF, CONFSTR, PATHCONF, CONSTANT } type; 55 long value; 56 }; 57 58 const struct conf_variable conf_table[] = 59 { 60 { "PATH", CONFSTR, _CS_PATH }, 61 62 /* Utility Limit Minimum Values */ 63 { "POSIX2_BC_BASE_MAX", CONSTANT, _POSIX2_BC_BASE_MAX }, 64 { "POSIX2_BC_DIM_MAX", CONSTANT, _POSIX2_BC_DIM_MAX }, 65 { "POSIX2_BC_SCALE_MAX", CONSTANT, _POSIX2_BC_SCALE_MAX }, 66 { "POSIX2_BC_STRING_MAX", CONSTANT, _POSIX2_BC_STRING_MAX }, 67 { "POSIX2_COLL_WEIGHTS_MAX", CONSTANT, _POSIX2_COLL_WEIGHTS_MAX }, 68 { "POSIX2_EXPR_NEST_MAX", CONSTANT, _POSIX2_EXPR_NEST_MAX }, 69 { "POSIX2_LINE_MAX", CONSTANT, _POSIX2_LINE_MAX }, 70 { "POSIX2_RE_DUP_MAX", CONSTANT, _POSIX2_RE_DUP_MAX }, 71 { "POSIX2_VERSION", CONSTANT, _POSIX2_VERSION }, 72 73 /* POSIX.1 Minimum Values */ 74 { "_POSIX_ARG_MAX", CONSTANT, _POSIX_ARG_MAX }, 75 { "_POSIX_CHILD_MAX", CONSTANT, _POSIX_CHILD_MAX }, 76 { "_POSIX_LINK_MAX", CONSTANT, _POSIX_LINK_MAX }, 77 { "_POSIX_MAX_CANON", CONSTANT, _POSIX_MAX_CANON }, 78 { "_POSIX_MAX_INPUT", CONSTANT, _POSIX_MAX_INPUT }, 79 { "_POSIX_NAME_MAX", CONSTANT, _POSIX_NAME_MAX }, 80 { "_POSIX_NGROUPS_MAX", CONSTANT, _POSIX_NGROUPS_MAX }, 81 { "_POSIX_OPEN_MAX", CONSTANT, _POSIX_OPEN_MAX }, 82 { "_POSIX_PATH_MAX", CONSTANT, _POSIX_PIPE_BUF }, 83 { "_POSIX_PIPE_BUF", CONSTANT, _POSIX_PIPE_BUF }, 84 { "_POSIX_SSIZE_MAX", CONSTANT, _POSIX_SSIZE_MAX }, 85 { "_POSIX_STREAM_MAX", CONSTANT, _POSIX_STREAM_MAX }, 86 { "_POSIX_TZNAME_MAX", CONSTANT, _POSIX_TZNAME_MAX }, 87 88 /* Symbolic Utility Limits */ 89 { "BC_BASE_MAX", SYSCONF, _SC_BC_BASE_MAX }, 90 { "BC_DIM_MAX", SYSCONF, _SC_BC_DIM_MAX }, 91 { "BC_SCALE_MAX", SYSCONF, _SC_BC_SCALE_MAX }, 92 { "BC_STRING_MAX", SYSCONF, _SC_BC_STRING_MAX }, 93 { "COLL_WEIGHTS_MAX", SYSCONF, _SC_COLL_WEIGHTS_MAX }, 94 { "EXPR_NEST_MAX", SYSCONF, _SC_EXPR_NEST_MAX }, 95 { "LINE_MAX", SYSCONF, _SC_LINE_MAX }, 96 { "RE_DUP_MAX", SYSCONF, _SC_RE_DUP_MAX }, 97 98 /* Optional Facility Configuration Values */ 99 #if 0 100 { "POSIX2_C_BIND", SYSCONF, ??? }, 101 #endif 102 { "POSIX2_C_DEV", SYSCONF, _SC_2_C_DEV }, 103 { "POSIX2_CHAR_TERM", SYSCONF, _SC_2_CHAR_TERM }, 104 { "POSIX2_FORT_DEV", SYSCONF, _SC_2_FORT_DEV }, 105 { "POSIX2_FORT_RUN", SYSCONF, _SC_2_FORT_RUN }, 106 { "POSIX2_LOCALEDEF", SYSCONF, _SC_2_LOCALEDEF }, 107 { "POSIX2_SW_DEV", SYSCONF, _SC_2_SW_DEV }, 108 { "POSIX2_UPE", SYSCONF, _SC_2_UPE }, 109 110 /* POSIX.1 Configurable System Variables */ 111 { "ARG_MAX", SYSCONF, _SC_ARG_MAX }, 112 { "CHILD_MAX", SYSCONF, _SC_CHILD_MAX }, 113 { "CLK_TCK", SYSCONF, _SC_CLK_TCK }, 114 { "NGROUPS_MAX", SYSCONF, _SC_NGROUPS_MAX }, 115 { "OPEN_MAX", SYSCONF, _SC_OPEN_MAX }, 116 { "STREAM_MAX", SYSCONF, _SC_STREAM_MAX }, 117 { "TZNAME_MAX", SYSCONF, _SC_TZNAME_MAX }, 118 { "_POSIX_JOB_CONTROL", SYSCONF, _SC_JOB_CONTROL }, 119 { "_POSIX_SAVED_IDS", SYSCONF, _SC_SAVED_IDS }, 120 { "_POSIX_VERSION", SYSCONF, _SC_VERSION }, 121 122 { "LINK_MAX", PATHCONF, _PC_LINK_MAX }, 123 { "MAX_CANON", PATHCONF, _PC_MAX_CANON }, 124 { "MAX_INPUT", PATHCONF, _PC_MAX_INPUT }, 125 { "NAME_MAX", PATHCONF, _PC_NAME_MAX }, 126 { "PATH_MAX", PATHCONF, _PC_PATH_MAX }, 127 { "PIPE_BUF", PATHCONF, _PC_PIPE_BUF }, 128 { "_POSIX_CHOWN_RESTRICTED", PATHCONF, _PC_CHOWN_RESTRICTED }, 129 { "_POSIX_NO_TRUNC", PATHCONF, _PC_NO_TRUNC }, 130 { "_POSIX_VDISABLE", PATHCONF, _PC_VDISABLE }, 131 132 { NULL } 133 }; 134 135 136 int 137 main(argc, argv) 138 int argc; 139 char **argv; 140 { 141 int ch; 142 const struct conf_variable *cp; 143 144 long val; 145 size_t slen; 146 char * sval; 147 148 setlocale(LC_ALL, ""); 149 150 while ((ch = getopt(argc, argv, "")) != -1) { 151 switch (ch) { 152 case '?': 153 default: 154 usage(); 155 } 156 } 157 argc -= optind; 158 argv += optind; 159 160 if (argc < 1 || argc > 2) { 161 usage(); 162 /* NOTREACHED */ 163 } 164 165 for (cp = conf_table; cp->name != NULL; cp++) { 166 if (strcmp(*argv, cp->name) == 0) 167 break; 168 } 169 if (cp->name == NULL) { 170 err(1, "%s: unknown variable", *argv); 171 /* NOTREACHED */ 172 } 173 174 if (cp->type == PATHCONF) { 175 if (argc != 2) usage(); 176 } else { 177 if (argc != 1) usage(); 178 } 179 180 switch (cp->type) { 181 case CONSTANT: 182 printf("%ld\n", cp->value); 183 break; 184 185 case CONFSTR: 186 slen = confstr (cp->value, (char *) 0, (size_t) 0); 187 188 if ((sval = malloc(slen)) == NULL) 189 err(1, NULL); 190 191 confstr(cp->value, sval, slen); 192 printf("%s\n", sval); 193 break; 194 195 case SYSCONF: 196 errno = 0; 197 if ((val = sysconf(cp->value)) == -1) { 198 if (errno != 0) { 199 err(1, NULL); 200 /* NOTREACHED */ 201 } 202 203 printf ("undefined\n"); 204 } else { 205 printf("%ld\n", val); 206 } 207 break; 208 209 case PATHCONF: 210 errno = 0; 211 if ((val = pathconf(argv[1], cp->value)) == -1) { 212 if (errno != 0) { 213 err(1, "%s", argv[1]); 214 /* NOTREACHED */ 215 } 216 217 printf ("undefined\n"); 218 } else { 219 printf ("%ld\n", val); 220 } 221 break; 222 } 223 224 exit (ferror(stdout)); 225 } 226 227 228 static void 229 usage() 230 { 231 fprintf (stderr, "usage: getconf system_var\n"); 232 fprintf (stderr, " getconf path_var pathname\n"); 233 exit(1); 234 } 235