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getconf.c revision 1.23 
      1 /*	$NetBSD: getconf.c,v 1.23 2006/10/07 15:20:44 elad 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 1.23 2006/10/07 15:20:44 elad 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 #include <string.h>
     52 
     53 struct conf_variable
     54 {
     55   const char *name;
     56   enum { SYSCONF, CONFSTR, PATHCONF, CONSTANT } type;
     57   long value;
     58 };
     59 
     60 static void print_longvar(const char *, long);
     61 static void print_strvar(const char *, const char *);
     62 static void printvar(const struct conf_variable *, const char *);
     63 static void usage(void);
     64 
     65 static const struct conf_variable conf_table[] =
     66 {
     67   { "PATH",			CONFSTR,	_CS_PATH		},
     68 
     69   /* Utility Limit Minimum Values */
     70   { "POSIX2_BC_BASE_MAX",	CONSTANT,	_POSIX2_BC_BASE_MAX	},
     71   { "POSIX2_BC_DIM_MAX",	CONSTANT,	_POSIX2_BC_DIM_MAX	},
     72   { "POSIX2_BC_SCALE_MAX",	CONSTANT,	_POSIX2_BC_SCALE_MAX	},
     73   { "POSIX2_BC_STRING_MAX",	CONSTANT,	_POSIX2_BC_STRING_MAX	},
     74   { "POSIX2_COLL_WEIGHTS_MAX",	CONSTANT,	_POSIX2_COLL_WEIGHTS_MAX },
     75   { "POSIX2_EXPR_NEST_MAX",	CONSTANT,	_POSIX2_EXPR_NEST_MAX	},
     76   { "POSIX2_LINE_MAX",		CONSTANT,	_POSIX2_LINE_MAX	},
     77   { "POSIX2_RE_DUP_MAX",	CONSTANT,	_POSIX2_RE_DUP_MAX	},
     78   { "POSIX2_VERSION",		CONSTANT,	_POSIX2_VERSION		},
     79 
     80   /* POSIX.1 Minimum Values */
     81   { "_POSIX_ARG_MAX",		CONSTANT,	_POSIX_ARG_MAX		},
     82   { "_POSIX_CHILD_MAX",		CONSTANT,	_POSIX_CHILD_MAX	},
     83   { "_POSIX_LINK_MAX",		CONSTANT,	_POSIX_LINK_MAX		},
     84   { "_POSIX_MAX_CANON",		CONSTANT,	_POSIX_MAX_CANON	},
     85   { "_POSIX_MAX_INPUT",		CONSTANT,	_POSIX_MAX_INPUT	},
     86   { "_POSIX_NAME_MAX",		CONSTANT,	_POSIX_NAME_MAX		},
     87   { "_POSIX_NGROUPS_MAX",	CONSTANT,	_POSIX_NGROUPS_MAX	},
     88   { "_POSIX_OPEN_MAX",		CONSTANT,	_POSIX_OPEN_MAX		},
     89   { "_POSIX_PATH_MAX",		CONSTANT,	_POSIX_PATH_MAX		},
     90   { "_POSIX_PIPE_BUF",		CONSTANT,	_POSIX_PIPE_BUF		},
     91   { "_POSIX_SSIZE_MAX",		CONSTANT,	_POSIX_SSIZE_MAX	},
     92   { "_POSIX_STREAM_MAX",	CONSTANT,	_POSIX_STREAM_MAX	},
     93   { "_POSIX_TZNAME_MAX",	CONSTANT,	_POSIX_TZNAME_MAX	},
     94 
     95   /* Symbolic Utility Limits */
     96   { "BC_BASE_MAX",		SYSCONF,	_SC_BC_BASE_MAX		},
     97   { "BC_DIM_MAX",		SYSCONF,	_SC_BC_DIM_MAX		},
     98   { "BC_SCALE_MAX",		SYSCONF,	_SC_BC_SCALE_MAX	},
     99   { "BC_STRING_MAX",		SYSCONF,	_SC_BC_STRING_MAX	},
    100   { "COLL_WEIGHTS_MAX",		SYSCONF,	_SC_COLL_WEIGHTS_MAX	},
    101   { "EXPR_NEST_MAX",		SYSCONF,	_SC_EXPR_NEST_MAX	},
    102   { "LINE_MAX",			SYSCONF,	_SC_LINE_MAX		},
    103   { "RE_DUP_MAX",		SYSCONF,	_SC_RE_DUP_MAX		},
    104 
    105   /* Optional Facility Configuration Values */
    106   { "POSIX2_C_BIND",		SYSCONF,	_SC_2_C_BIND		},
    107   { "POSIX2_C_DEV",		SYSCONF,	_SC_2_C_DEV		},
    108   { "POSIX2_CHAR_TERM",		SYSCONF,	_SC_2_CHAR_TERM		},
    109   { "POSIX2_FORT_DEV",		SYSCONF,	_SC_2_FORT_DEV		},
    110   { "POSIX2_FORT_RUN",		SYSCONF,	_SC_2_FORT_RUN		},
    111   { "POSIX2_LOCALEDEF",		SYSCONF,	_SC_2_LOCALEDEF		},
    112   { "POSIX2_SW_DEV",		SYSCONF,	_SC_2_SW_DEV		},
    113   { "POSIX2_UPE",		SYSCONF,	_SC_2_UPE		},
    114 
    115   /* POSIX.1 Configurable System Variables */
    116   { "ARG_MAX",			SYSCONF,	_SC_ARG_MAX 		},
    117   { "CHILD_MAX",		SYSCONF,	_SC_CHILD_MAX		},
    118   { "CLK_TCK",			SYSCONF,	_SC_CLK_TCK		},
    119   { "NGROUPS_MAX",		SYSCONF,	_SC_NGROUPS_MAX		},
    120   { "OPEN_MAX",			SYSCONF,	_SC_OPEN_MAX		},
    121   { "STREAM_MAX",		SYSCONF,	_SC_STREAM_MAX		},
    122   { "TZNAME_MAX",		SYSCONF,	_SC_TZNAME_MAX		},
    123   { "_POSIX_JOB_CONTROL",	SYSCONF,	_SC_JOB_CONTROL 	},
    124   { "_POSIX_SAVED_IDS",		SYSCONF,	_SC_SAVED_IDS		},
    125   { "_POSIX_VERSION",		SYSCONF,	_SC_VERSION		},
    126 
    127   { "LINK_MAX",			PATHCONF,	_PC_LINK_MAX		},
    128   { "MAX_CANON",		PATHCONF,	_PC_MAX_CANON		},
    129   { "MAX_INPUT",		PATHCONF,	_PC_MAX_INPUT		},
    130   { "NAME_MAX",			PATHCONF,	_PC_NAME_MAX		},
    131   { "PATH_MAX",			PATHCONF,	_PC_PATH_MAX		},
    132   { "PIPE_BUF",			PATHCONF,	_PC_PIPE_BUF		},
    133   { "_POSIX_CHOWN_RESTRICTED",	PATHCONF,	_PC_CHOWN_RESTRICTED	},
    134   { "_POSIX_NO_TRUNC",		PATHCONF,	_PC_NO_TRUNC		},
    135   { "_POSIX_VDISABLE",		PATHCONF,	_PC_VDISABLE		},
    136 
    137   /* POSIX.1b Configurable System Variables */
    138   { "PAGESIZE",			SYSCONF,	_SC_PAGESIZE		},
    139   { "_POSIX_FSYNC",		SYSCONF,	_SC_FSYNC		},
    140   { "_POSIX_MAPPED_FILES",	SYSCONF,	_SC_MAPPED_FILES	},
    141   { "_POSIX_MEMLOCK",		SYSCONF,	_SC_MEMLOCK		},
    142   { "_POSIX_MEMLOCK_RANGE",	SYSCONF,	_SC_MEMLOCK_RANGE	},
    143   { "_POSIX_MEMORY_PROTECTION",	SYSCONF,	_SC_MEMORY_PROTECTION	},
    144   { "_POSIX_MONOTONIC_CLOCK",	SYSCONF,	_SC_MONOTONIC_CLOCK	},
    145   { "_POSIX_SEMAPHORES",	SYSCONF,	_SC_SEMAPHORES		},
    146   { "_POSIX_SYNCHRONIZED_IO",	SYSCONF,	_SC_SYNCHRONIZED_IO	},
    147   { "_POSIX_TIMERS",		SYSCONF,	_SC_TIMERS		},
    148 
    149   { "_POSIX_SYNC_IO",		PATHCONF,	_PC_SYNC_IO		},
    150 
    151   /* POSIX.1c Configurable System Variables */
    152   { "LOGIN_NAME_MAX",		SYSCONF,	_SC_LOGIN_NAME_MAX	},
    153   { "_POSIX_THREADS",		SYSCONF,	_SC_THREADS		},
    154 
    155   /* POSIX.1j Configurable System Variables */
    156   { "_POSIX_BARRIERS",		SYSCONF,	_SC_BARRIERS		},
    157   { "_POSIX_READER_WRITER_LOCKS", SYSCONF,	_SC_READER_WRITER_LOCKS	},
    158   { "_POSIX_SPIN_LOCKS",	SYSCONF,	_SC_SPIN_LOCKS		},
    159 
    160   /* XPG4.2 Configurable System Variables */
    161   { "IOV_MAX",			SYSCONF,	_SC_IOV_MAX		},
    162   { "PAGE_SIZE",		SYSCONF,	_SC_PAGE_SIZE		},
    163   { "_XOPEN_SHM",		SYSCONF,	_SC_XOPEN_SHM		},
    164 
    165   /* X/Open CAE Spec. Issue 5 Version 2 Configurable System Variables */
    166   { "FILESIZEBITS",		PATHCONF,	_PC_FILESIZEBITS	},
    167 
    168   /* POSIX.1-2001 XSI Option Group Configurable System Variables */
    169   { "ATEXIT_MAX",		SYSCONF,	_SC_ATEXIT_MAX		},
    170 
    171   /* POSIX.1-2001 TSF Configurable System Variables */
    172   { "GETGR_R_SIZE_MAX",		SYSCONF,	_SC_GETGR_R_SIZE_MAX	},
    173   { "GETPW_R_SIZE_MAX",		SYSCONF,	_SC_GETPW_R_SIZE_MAX	},
    174 
    175   { NULL, CONSTANT, 0L }
    176 };
    177 
    178 static int a_flag = 0;		/* list all variables */
    179 
    180 int
    181 main(int argc, char **argv)
    182 {
    183 	int ch;
    184 	const struct conf_variable *cp;
    185 	const char *varname, *pathname;
    186 	int found;
    187 
    188 	setlocale(LC_ALL, "");
    189 
    190 	while ((ch = getopt(argc, argv, "a")) != -1) {
    191 		switch (ch) {
    192 		case 'a':
    193 			a_flag = 1;
    194 			break;
    195 		case '?':
    196 		default:
    197 			usage();
    198 		}
    199 	}
    200 	argc -= optind;
    201 	argv += optind;
    202 
    203 	varname = NULL;
    204 	if (!a_flag && argc == 0) {
    205 		usage();
    206 		/* NOTREACHED */
    207 	}
    208 	if (a_flag) {
    209 		varname = argv[0];
    210 		argc--;
    211 		argv++;
    212 	}
    213 	if (argc != 0 && argc != 1) {
    214 		usage();
    215 		/* NOTREACHED */
    216 	}
    217 	pathname = argv[0];	/* may be NULL */
    218 
    219 	found = 0;
    220 	for (cp = conf_table; cp->name != NULL; cp++) {
    221 		if (a_flag || strcmp(varname, cp->name) == 0) {
    222 			if ((cp->type == PATHCONF) == (pathname != NULL)) {
    223 				printvar(cp, pathname);
    224 				found = 1;
    225 			} else if (!a_flag) {
    226 				errx(1, "%s: invalid variable type", cp->name);
    227 				/* NOTREACHED */
    228 			}
    229 		}
    230 	}
    231 
    232 	if (!a_flag && !found) {
    233 		errx(1, "%s: unknown variable", varname);
    234 		/* NOTREACHED */
    235 	}
    236 
    237 	(void)fflush(stdout);
    238 	return ferror(stdout) ? EXIT_FAILURE : EXIT_SUCCESS;
    239 }
    240 
    241 static void
    242 print_longvar(const char *name, long value)
    243 {
    244 	if (a_flag)
    245 		(void)printf("%s = %ld\n", name, value);
    246 	else
    247 		(void)printf("%ldn", value);
    248 }
    249 
    250 static void
    251 print_strvar(const char *name, const char *sval)
    252 {
    253 	if (a_flag)
    254 		(void)printf("%s = %s\n", name, sval);
    255 	else
    256 		(void)printf("%s\n", sval);
    257 }
    258 
    259 static void
    260 printvar(const struct conf_variable *cp, const char *pathname)
    261 {
    262 	size_t slen;
    263 	char *sval;
    264 	long val;
    265 
    266 	switch (cp->type) {
    267 	case CONSTANT:
    268 		print_longvar(cp->name, cp->value);
    269 		break;
    270 
    271 	case CONFSTR:
    272 		slen = confstr (cp->value, (char *) 0, (size_t) 0);
    273 
    274 		if ((sval = malloc(slen)) == NULL)
    275 			err(1, "malloc");
    276 
    277 		confstr(cp->value, sval, slen);
    278 		print_strvar(cp->name, sval);
    279 		break;
    280 
    281 	case SYSCONF:
    282 		errno = 0;
    283 		if ((val = sysconf(cp->value)) == -1) {
    284 			if (errno != 0) {
    285 				err(1, "sysconf");
    286 				/* NOTREACHED */
    287 			}
    288 
    289 			print_strvar(cp->name, "undefined");
    290 		} else {
    291 			print_longvar(cp->name, val);
    292 		}
    293 		break;
    294 
    295 	case PATHCONF:
    296 		errno = 0;
    297 		if ((val = pathconf(pathname, cp->value)) == -1) {
    298 			if (errno != 0) {
    299 				if (a_flag && errno == EINVAL) {
    300 					/* Just skip invalid variables */
    301 					return;
    302 				}
    303 				err(1, "%s", pathname);
    304 				/* NOTREACHED */
    305 			}
    306 
    307 			print_strvar(cp->name, "undefined");
    308 		} else {
    309 			print_longvar(cp->name, val);
    310 		}
    311 		break;
    312 	}
    313 }
    314 
    315 
    316 static void
    317 usage(void)
    318 {
    319 	fprintf(stderr, "usage: getconf system_var\n");
    320 	fprintf(stderr, "       getconf -a\n");
    321 	fprintf(stderr, "       getconf path_var pathname\n");
    322 	fprintf(stderr, "       getconf -a pathname\n");
    323 	exit(EXIT_FAILURE);
    324 }
    325