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getconf.c revision 1.9 
      1 /*	$NetBSD: getconf.c,v 1.9 1999/03/22 19:18:10 kleink 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 1.9 1999/03/22 19:18:10 kleink 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_PIPE_BUF		},
     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 #if 0
    104   { "POSIX2_C_BIND",		SYSCONF,	???			},
    105 #endif
    106   { "POSIX2_C_DEV",		SYSCONF,	_SC_2_C_DEV		},
    107   { "POSIX2_CHAR_TERM",		SYSCONF,	_SC_2_CHAR_TERM		},
    108   { "POSIX2_FORT_DEV",		SYSCONF,	_SC_2_FORT_DEV		},
    109   { "POSIX2_FORT_RUN",		SYSCONF,	_SC_2_FORT_RUN		},
    110   { "POSIX2_LOCALEDEF",		SYSCONF,	_SC_2_LOCALEDEF		},
    111   { "POSIX2_SW_DEV",		SYSCONF,	_SC_2_SW_DEV		},
    112   { "POSIX2_UPE",		SYSCONF,	_SC_2_UPE		},
    113 
    114   /* POSIX.1 Configurable System Variables */
    115   { "ARG_MAX",			SYSCONF,	_SC_ARG_MAX 		},
    116   { "CHILD_MAX",		SYSCONF,	_SC_CHILD_MAX		},
    117   { "CLK_TCK",			SYSCONF,	_SC_CLK_TCK		},
    118   { "NGROUPS_MAX",		SYSCONF,	_SC_NGROUPS_MAX		},
    119   { "OPEN_MAX",			SYSCONF,	_SC_OPEN_MAX		},
    120   { "STREAM_MAX",		SYSCONF,	_SC_STREAM_MAX		},
    121   { "TZNAME_MAX",		SYSCONF,	_SC_TZNAME_MAX		},
    122   { "_POSIX_JOB_CONTROL",	SYSCONF,	_SC_JOB_CONTROL 	},
    123   { "_POSIX_SAVED_IDS",		SYSCONF,	_SC_SAVED_IDS		},
    124   { "_POSIX_VERSION",		SYSCONF,	_SC_VERSION		},
    125 
    126   { "LINK_MAX",			PATHCONF,	_PC_LINK_MAX		},
    127   { "MAX_CANON",		PATHCONF,	_PC_MAX_CANON		},
    128   { "MAX_INPUT",		PATHCONF,	_PC_MAX_INPUT		},
    129   { "NAME_MAX",			PATHCONF,	_PC_NAME_MAX		},
    130   { "PATH_MAX",			PATHCONF,	_PC_PATH_MAX		},
    131   { "PIPE_BUF",			PATHCONF,	_PC_PIPE_BUF		},
    132   { "_POSIX_CHOWN_RESTRICTED",	PATHCONF,	_PC_CHOWN_RESTRICTED	},
    133   { "_POSIX_NO_TRUNC",		PATHCONF,	_PC_NO_TRUNC		},
    134   { "_POSIX_VDISABLE",		PATHCONF,	_PC_VDISABLE		},
    135 
    136   /* POSIX.1b Configurable System Variables */
    137   { "PAGESIZE",			SYSCONF,	_SC_PAGESIZE		},
    138   { "_POSIX_FSYNC",		SYSCONF,	_SC_FSYNC		},
    139   { "_POSIX_SYNCHRONIZED_IO",	SYSCONF,	_SC_SYNCHRONIZED_IO	},
    140 
    141   { "_POSIX_SYNC_IO",		PATHCONF,	_PC_SYNC_IO		},
    142 
    143 
    144   /* XPG4.2 Configurable System Variables */
    145   { "IOV_MAX",			SYSCONF,	_SC_IOV_MAX		},
    146   { "PAGE_SIZE",		SYSCONF,	_SC_PAGE_SIZE		},
    147   { "_XOPEN_SHM",		SYSCONF,	_SC_XOPEN_SHM		},
    148 
    149   /* X/Open CAE Spec. Issue 5 Version 2 Configurable System Variables */
    150   { "FILESIZEBITS",		PATHCONF,	_PC_FILESIZEBITS	},
    151   { NULL }
    152 };
    153 
    154 
    155 int
    156 main(argc, argv)
    157 	int argc;
    158 	char **argv;
    159 {
    160 	int ch;
    161 	const struct conf_variable *cp;
    162 
    163 	long val;
    164 	size_t slen;
    165 	char * sval;
    166 
    167 	setlocale(LC_ALL, "");
    168 
    169 	while ((ch = getopt(argc, argv, "")) != -1) {
    170 		switch (ch) {
    171 		case '?':
    172 		default:
    173 			usage();
    174 		}
    175 	}
    176 	argc -= optind;
    177 	argv += optind;
    178 
    179 	if (argc < 1 || argc > 2) {
    180 		usage();
    181 		/* NOTREACHED */
    182 	}
    183 
    184 	for (cp = conf_table; cp->name != NULL; cp++) {
    185 		if (strcmp(*argv, cp->name) == 0)
    186 			break;
    187 	}
    188 	if (cp->name == NULL) {
    189 		errx(1, "%s: unknown variable", *argv);
    190 		/* NOTREACHED */
    191 	}
    192 
    193 	if (cp->type == PATHCONF) {
    194 		if (argc != 2) usage();
    195 	} else {
    196 		if (argc != 1) usage();
    197 	}
    198 
    199 	switch (cp->type) {
    200 	case CONSTANT:
    201 		printf("%ld\n", cp->value);
    202 		break;
    203 
    204 	case CONFSTR:
    205 		slen = confstr (cp->value, (char *) 0, (size_t) 0);
    206 
    207 		if ((sval = malloc(slen)) == NULL)
    208 			err(1, "malloc");
    209 
    210 		confstr(cp->value, sval, slen);
    211 		printf("%s\n", sval);
    212 		break;
    213 
    214 	case SYSCONF:
    215 		errno = 0;
    216 		if ((val = sysconf(cp->value)) == -1) {
    217 			if (errno != 0) {
    218 				err(1, "malloc");
    219 				/* NOTREACHED */
    220 			}
    221 
    222 			printf ("undefined\n");
    223 		} else {
    224 			printf("%ld\n", val);
    225 		}
    226 		break;
    227 
    228 	case PATHCONF:
    229 		errno = 0;
    230 		if ((val = pathconf(argv[1], cp->value)) == -1) {
    231 			if (errno != 0) {
    232 				err(1, "%s", argv[1]);
    233 				/* NOTREACHED */
    234 			}
    235 
    236 			printf ("undefined\n");
    237 		} else {
    238 			printf ("%ld\n", val);
    239 		}
    240 		break;
    241 	}
    242 
    243 	exit (ferror(stdout));
    244 }
    245 
    246 
    247 static void
    248 usage()
    249 {
    250   fprintf (stderr, "usage: getconf system_var\n");
    251   fprintf (stderr, "       getconf path_var pathname\n");
    252   exit(1);
    253 }
    254