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getconf.c revision 1.1 
      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 (at) wimsey.com), Winning Strategies, Inc.
     36  */
     37 
     38 #ifndef lint
     39 static char rcsid[] = "$Id: getconf.c,v 1.1 1994/04/27 19:50:54 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 
    236 
    237 #ifdef NEED_SYSCONF
    238 long
    239 sysconf(name)
    240 	int name;
    241 {
    242 	errno = ENOSYS;
    243 	return -1;
    244 }
    245 #endif
    246 
    247 #ifdef NEED_PATHCONF
    248 long
    249 pathconf(path, name)
    250 	const char *path;
    251 	int name;
    252 {
    253 	if (path == NULL) {
    254 		errno = EINVAL;
    255 		return -1;
    256 	}
    257 
    258 	errno = ENOSYS;
    259 	return -1;
    260 }
    261 #endif
    262