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getconf.c revision 1.12.4.1 
      1 /*	$NetBSD: getconf.c,v 1.12.4.1 2002/09/04 02:50:29 itojun Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1996, 1998 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 FOUNDATION OR CONTRIBUTORS
     30  * BE 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 #include <sys/cdefs.h>
     40 #ifndef lint
     41 __RCSID("$NetBSD: getconf.c,v 1.12.4.1 2002/09/04 02:50:29 itojun Exp $");
     42 #endif /* not lint */
     43 
     44 #include <err.h>
     45 #include <errno.h>
     46 #include <limits.h>
     47 #include <locale.h>
     48 #include <stdio.h>
     49 #include <stdlib.h>
     50 #include <unistd.h>
     51 
     52 int	main __P((int, char **));
     53 static void usage __P((void));
     54 
     55 struct conf_variable
     56 {
     57   const char *name;
     58   enum { SYSCONF, CONFSTR, PATHCONF, CONSTANT } type;
     59   long value;
     60 };
     61 
     62 const struct conf_variable conf_table[] =
     63 {
     64   { "PATH",			CONFSTR,	_CS_PATH		},
     65 
     66   /* Utility Limit Minimum Values */
     67   { "POSIX2_BC_BASE_MAX",	CONSTANT,	_POSIX2_BC_BASE_MAX	},
     68   { "POSIX2_BC_DIM_MAX",	CONSTANT,	_POSIX2_BC_DIM_MAX	},
     69   { "POSIX2_BC_SCALE_MAX",	CONSTANT,	_POSIX2_BC_SCALE_MAX	},
     70   { "POSIX2_BC_STRING_MAX",	CONSTANT,	_POSIX2_BC_STRING_MAX	},
     71   { "POSIX2_COLL_WEIGHTS_MAX",	CONSTANT,	_POSIX2_COLL_WEIGHTS_MAX },
     72   { "POSIX2_EXPR_NEST_MAX",	CONSTANT,	_POSIX2_EXPR_NEST_MAX	},
     73   { "POSIX2_LINE_MAX",		CONSTANT,	_POSIX2_LINE_MAX	},
     74   { "POSIX2_RE_DUP_MAX",	CONSTANT,	_POSIX2_RE_DUP_MAX	},
     75   { "POSIX2_VERSION",		CONSTANT,	_POSIX2_VERSION		},
     76 
     77   /* POSIX.1 Minimum Values */
     78   { "_POSIX_ARG_MAX",		CONSTANT,	_POSIX_ARG_MAX		},
     79   { "_POSIX_CHILD_MAX",		CONSTANT,	_POSIX_CHILD_MAX	},
     80   { "_POSIX_LINK_MAX",		CONSTANT,	_POSIX_LINK_MAX		},
     81   { "_POSIX_MAX_CANON",		CONSTANT,	_POSIX_MAX_CANON	},
     82   { "_POSIX_MAX_INPUT",		CONSTANT,	_POSIX_MAX_INPUT	},
     83   { "_POSIX_NAME_MAX",		CONSTANT,	_POSIX_NAME_MAX		},
     84   { "_POSIX_NGROUPS_MAX",	CONSTANT,	_POSIX_NGROUPS_MAX	},
     85   { "_POSIX_OPEN_MAX",		CONSTANT,	_POSIX_OPEN_MAX		},
     86   { "_POSIX_PATH_MAX",		CONSTANT,	_POSIX_PATH_MAX		},
     87   { "_POSIX_PIPE_BUF",		CONSTANT,	_POSIX_PIPE_BUF		},
     88   { "_POSIX_SSIZE_MAX",		CONSTANT,	_POSIX_SSIZE_MAX	},
     89   { "_POSIX_STREAM_MAX",	CONSTANT,	_POSIX_STREAM_MAX	},
     90   { "_POSIX_TZNAME_MAX",	CONSTANT,	_POSIX_TZNAME_MAX	},
     91 
     92   /* Symbolic Utility Limits */
     93   { "BC_BASE_MAX",		SYSCONF,	_SC_BC_BASE_MAX		},
     94   { "BC_DIM_MAX",		SYSCONF,	_SC_BC_DIM_MAX		},
     95   { "BC_SCALE_MAX",		SYSCONF,	_SC_BC_SCALE_MAX	},
     96   { "BC_STRING_MAX",		SYSCONF,	_SC_BC_STRING_MAX	},
     97   { "COLL_WEIGHTS_MAX",		SYSCONF,	_SC_COLL_WEIGHTS_MAX	},
     98   { "EXPR_NEST_MAX",		SYSCONF,	_SC_EXPR_NEST_MAX	},
     99   { "LINE_MAX",			SYSCONF,	_SC_LINE_MAX		},
    100   { "RE_DUP_MAX",		SYSCONF,	_SC_RE_DUP_MAX		},
    101 
    102   /* Optional Facility Configuration Values */
    103   { "POSIX2_C_BIND",		SYSCONF,	_SC_2_C_BIND		},
    104   { "POSIX2_C_DEV",		SYSCONF,	_SC_2_C_DEV		},
    105   { "POSIX2_CHAR_TERM",		SYSCONF,	_SC_2_CHAR_TERM		},
    106   { "POSIX2_FORT_DEV",		SYSCONF,	_SC_2_FORT_DEV		},
    107   { "POSIX2_FORT_RUN",		SYSCONF,	_SC_2_FORT_RUN		},
    108   { "POSIX2_LOCALEDEF",		SYSCONF,	_SC_2_LOCALEDEF		},
    109   { "POSIX2_SW_DEV",		SYSCONF,	_SC_2_SW_DEV		},
    110   { "POSIX2_UPE",		SYSCONF,	_SC_2_UPE		},
    111 
    112   /* POSIX.1 Configurable System Variables */
    113   { "ARG_MAX",			SYSCONF,	_SC_ARG_MAX 		},
    114   { "CHILD_MAX",		SYSCONF,	_SC_CHILD_MAX		},
    115   { "CLK_TCK",			SYSCONF,	_SC_CLK_TCK		},
    116   { "NGROUPS_MAX",		SYSCONF,	_SC_NGROUPS_MAX		},
    117   { "OPEN_MAX",			SYSCONF,	_SC_OPEN_MAX		},
    118   { "STREAM_MAX",		SYSCONF,	_SC_STREAM_MAX		},
    119   { "TZNAME_MAX",		SYSCONF,	_SC_TZNAME_MAX		},
    120   { "_POSIX_JOB_CONTROL",	SYSCONF,	_SC_JOB_CONTROL 	},
    121   { "_POSIX_SAVED_IDS",		SYSCONF,	_SC_SAVED_IDS		},
    122   { "_POSIX_VERSION",		SYSCONF,	_SC_VERSION		},
    123 
    124   { "LINK_MAX",			PATHCONF,	_PC_LINK_MAX		},
    125   { "MAX_CANON",		PATHCONF,	_PC_MAX_CANON		},
    126   { "MAX_INPUT",		PATHCONF,	_PC_MAX_INPUT		},
    127   { "NAME_MAX",			PATHCONF,	_PC_NAME_MAX		},
    128   { "PATH_MAX",			PATHCONF,	_PC_PATH_MAX		},
    129   { "PIPE_BUF",			PATHCONF,	_PC_PIPE_BUF		},
    130   { "_POSIX_CHOWN_RESTRICTED",	PATHCONF,	_PC_CHOWN_RESTRICTED	},
    131   { "_POSIX_NO_TRUNC",		PATHCONF,	_PC_NO_TRUNC		},
    132   { "_POSIX_VDISABLE",		PATHCONF,	_PC_VDISABLE		},
    133 
    134   /* POSIX.1b Configurable System Variables */
    135   { "PAGESIZE",			SYSCONF,	_SC_PAGESIZE		},
    136   { "_POSIX_FSYNC",		SYSCONF,	_SC_FSYNC		},
    137   { "_POSIX_MAPPED_FILES",	SYSCONF,	_SC_MAPPED_FILES	},
    138   { "_POSIX_MEMLOCK",		SYSCONF,	_SC_MEMLOCK		},
    139   { "_POSIX_MEMLOCK_RANGE",	SYSCONF,	_SC_MEMLOCK_RANGE	},
    140   { "_POSIX_MEMORY_PROTECTION",	SYSCONF,	_SC_MEMORY_PROTECTION	},
    141   { "_POSIX_SYNCHRONIZED_IO",	SYSCONF,	_SC_SYNCHRONIZED_IO	},
    142 
    143   { "_POSIX_SYNC_IO",		PATHCONF,	_PC_SYNC_IO		},
    144 
    145   /* POSIX.1c Configurable System Variables */
    146   { "LOGIN_NAME_MAX",		SYSCONF,	_SC_LOGIN_NAME_MAX	},
    147 
    148   /* XPG4.2 Configurable System Variables */
    149   { "IOV_MAX",			SYSCONF,	_SC_IOV_MAX		},
    150   { "PAGE_SIZE",		SYSCONF,	_SC_PAGE_SIZE		},
    151   { "_XOPEN_SHM",		SYSCONF,	_SC_XOPEN_SHM		},
    152 
    153   /* X/Open CAE Spec. Issue 5 Version 2 Configurable System Variables */
    154   { "FILESIZEBITS",		PATHCONF,	_PC_FILESIZEBITS	},
    155   { NULL }
    156 };
    157 
    158 
    159 int
    160 main(argc, argv)
    161 	int argc;
    162 	char **argv;
    163 {
    164 	int ch;
    165 	const struct conf_variable *cp;
    166 
    167 	long val;
    168 	size_t slen;
    169 	char * sval;
    170 
    171 	setlocale(LC_ALL, "");
    172 
    173 	while ((ch = getopt(argc, argv, "")) != -1) {
    174 		switch (ch) {
    175 		case '?':
    176 		default:
    177 			usage();
    178 		}
    179 	}
    180 	argc -= optind;
    181 	argv += optind;
    182 
    183 	if (argc < 1 || argc > 2) {
    184 		usage();
    185 		/* NOTREACHED */
    186 	}
    187 
    188 	for (cp = conf_table; cp->name != NULL; cp++) {
    189 		if (strcmp(*argv, cp->name) == 0)
    190 			break;
    191 	}
    192 	if (cp->name == NULL) {
    193 		errx(1, "%s: unknown variable", *argv);
    194 		/* NOTREACHED */
    195 	}
    196 
    197 	if (cp->type == PATHCONF) {
    198 		if (argc != 2) usage();
    199 	} else {
    200 		if (argc != 1) usage();
    201 	}
    202 
    203 	switch (cp->type) {
    204 	case CONSTANT:
    205 		printf("%ld\n", cp->value);
    206 		break;
    207 
    208 	case CONFSTR:
    209 		slen = confstr (cp->value, (char *) 0, (size_t) 0);
    210 
    211 		if ((sval = malloc(slen)) == NULL)
    212 			err(1, "malloc");
    213 
    214 		confstr(cp->value, sval, slen);
    215 		printf("%s\n", sval);
    216 		break;
    217 
    218 	case SYSCONF:
    219 		errno = 0;
    220 		if ((val = sysconf(cp->value)) == -1) {
    221 			if (errno != 0) {
    222 				err(1, "malloc");
    223 				/* NOTREACHED */
    224 			}
    225 
    226 			printf ("undefined\n");
    227 		} else {
    228 			printf("%ld\n", val);
    229 		}
    230 		break;
    231 
    232 	case PATHCONF:
    233 		errno = 0;
    234 		if ((val = pathconf(argv[1], cp->value)) == -1) {
    235 			if (errno != 0) {
    236 				err(1, "%s", argv[1]);
    237 				/* NOTREACHED */
    238 			}
    239 
    240 			printf ("undefined\n");
    241 		} else {
    242 			printf ("%ld\n", val);
    243 		}
    244 		break;
    245 	}
    246 
    247 	exit (ferror(stdout));
    248 }
    249 
    250 
    251 static void
    252 usage()
    253 {
    254   fprintf (stderr, "usage: getconf system_var\n");
    255   fprintf (stderr, "       getconf path_var pathname\n");
    256   exit(1);
    257 }
    258