OpenBSD-4.6/usr.bin/getconf/getconf.c
/* $OpenBSD: getconf.c,v 1.11 2008/11/08 01:29:10 chl Exp $ */
/*-
* Copyright (c) 1996 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by J.T. Conklin.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Winning Strategies, Inc.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* POSIX.2 getconf utility
*
* Written by:
* J.T. Conklin (jtc@wimsey.com), Winning Strategies, Inc.
*/
#ifndef lint
static char rcsid[] = "$OpenBSD: getconf.c,v 1.11 2008/11/08 01:29:10 chl Exp $";
#endif /* not lint */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <locale.h>
#include <unistd.h>
#include <err.h>
#include <errno.h>
static void usage(void);
struct conf_variable
{
const char *name;
enum { SYSCONF, CONFSTR, PATHCONF, CONSTANT } type;
long value;
};
const struct conf_variable conf_table[] =
{
{ "PATH", CONFSTR, _CS_PATH },
/* Utility Limit Minimum Values */
{ "POSIX2_BC_BASE_MAX", CONSTANT, _POSIX2_BC_BASE_MAX },
{ "POSIX2_BC_DIM_MAX", CONSTANT, _POSIX2_BC_DIM_MAX },
{ "POSIX2_BC_SCALE_MAX", CONSTANT, _POSIX2_BC_SCALE_MAX },
{ "POSIX2_BC_STRING_MAX", CONSTANT, _POSIX2_BC_STRING_MAX },
{ "POSIX2_COLL_WEIGHTS_MAX", CONSTANT, _POSIX2_COLL_WEIGHTS_MAX },
{ "POSIX2_EXPR_NEST_MAX", CONSTANT, _POSIX2_EXPR_NEST_MAX },
{ "POSIX2_LINE_MAX", CONSTANT, _POSIX2_LINE_MAX },
{ "POSIX2_RE_DUP_MAX", CONSTANT, _POSIX2_RE_DUP_MAX },
{ "POSIX2_VERSION", CONSTANT, _POSIX2_VERSION },
/* POSIX.1 Minimum Values */
{ "_POSIX_ARG_MAX", CONSTANT, _POSIX_ARG_MAX },
{ "_POSIX_CHILD_MAX", CONSTANT, _POSIX_CHILD_MAX },
{ "_POSIX_LINK_MAX", CONSTANT, _POSIX_LINK_MAX },
{ "_POSIX_MAX_CANON", CONSTANT, _POSIX_MAX_CANON },
{ "_POSIX_MAX_INPUT", CONSTANT, _POSIX_MAX_INPUT },
{ "_POSIX_NAME_MAX", CONSTANT, _POSIX_NAME_MAX },
{ "_POSIX_NGROUPS_MAX", CONSTANT, _POSIX_NGROUPS_MAX },
{ "_POSIX_OPEN_MAX", CONSTANT, _POSIX_OPEN_MAX },
{ "_POSIX_PATH_MAX", CONSTANT, _POSIX_PATH_MAX },
{ "_POSIX_PIPE_BUF", CONSTANT, _POSIX_PIPE_BUF },
{ "_POSIX_SSIZE_MAX", CONSTANT, _POSIX_SSIZE_MAX },
{ "_POSIX_STREAM_MAX", CONSTANT, _POSIX_STREAM_MAX },
{ "_POSIX_TZNAME_MAX", CONSTANT, _POSIX_TZNAME_MAX },
/* Symbolic Utility Limits */
{ "BC_BASE_MAX", SYSCONF, _SC_BC_BASE_MAX },
{ "BC_DIM_MAX", SYSCONF, _SC_BC_DIM_MAX },
{ "BC_SCALE_MAX", SYSCONF, _SC_BC_SCALE_MAX },
{ "BC_STRING_MAX", SYSCONF, _SC_BC_STRING_MAX },
{ "COLL_WEIGHTS_MAX", SYSCONF, _SC_COLL_WEIGHTS_MAX },
{ "EXPR_NEST_MAX", SYSCONF, _SC_EXPR_NEST_MAX },
{ "LINE_MAX", SYSCONF, _SC_LINE_MAX },
{ "RE_DUP_MAX", SYSCONF, _SC_RE_DUP_MAX },
/* Optional Facility Configuration Values */
#if 0
{ "POSIX2_C_BIND", SYSCONF, ??? },
#endif
{ "POSIX2_C_DEV", SYSCONF, _SC_2_C_DEV },
{ "POSIX2_CHAR_TERM", SYSCONF, _SC_2_CHAR_TERM },
{ "POSIX2_FORT_DEV", SYSCONF, _SC_2_FORT_DEV },
{ "POSIX2_FORT_RUN", SYSCONF, _SC_2_FORT_RUN },
{ "POSIX2_LOCALEDEF", SYSCONF, _SC_2_LOCALEDEF },
{ "POSIX2_SW_DEV", SYSCONF, _SC_2_SW_DEV },
{ "POSIX2_UPE", SYSCONF, _SC_2_UPE },
/* POSIX.1 Configurable System Variables */
{ "ARG_MAX", SYSCONF, _SC_ARG_MAX },
{ "CHILD_MAX", SYSCONF, _SC_CHILD_MAX },
{ "CLK_TCK", SYSCONF, _SC_CLK_TCK },
{ "NGROUPS_MAX", SYSCONF, _SC_NGROUPS_MAX },
{ "OPEN_MAX", SYSCONF, _SC_OPEN_MAX },
{ "STREAM_MAX", SYSCONF, _SC_STREAM_MAX },
{ "TZNAME_MAX", SYSCONF, _SC_TZNAME_MAX },
{ "_POSIX_JOB_CONTROL", SYSCONF, _SC_JOB_CONTROL },
{ "_POSIX_SAVED_IDS", SYSCONF, _SC_SAVED_IDS },
{ "_POSIX_VERSION", SYSCONF, _SC_VERSION },
{ "LINK_MAX", PATHCONF, _PC_LINK_MAX },
{ "MAX_CANON", PATHCONF, _PC_MAX_CANON },
{ "MAX_INPUT", PATHCONF, _PC_MAX_INPUT },
{ "NAME_MAX", PATHCONF, _PC_NAME_MAX },
{ "PATH_MAX", PATHCONF, _PC_PATH_MAX },
{ "PIPE_BUF", PATHCONF, _PC_PIPE_BUF },
{ "_POSIX_CHOWN_RESTRICTED", PATHCONF, _PC_CHOWN_RESTRICTED },
{ "_POSIX_NO_TRUNC", PATHCONF, _PC_NO_TRUNC },
{ "_POSIX_VDISABLE", PATHCONF, _PC_VDISABLE },
{ NULL }
};
int
main(int argc, char *argv[])
{
int ch;
const struct conf_variable *cp;
long val;
size_t slen;
char * sval;
setlocale(LC_ALL, "");
while ((ch = getopt(argc, argv, "")) != -1) {
switch (ch) {
case '?':
default:
usage();
}
}
argc -= optind;
argv += optind;
if (argc < 1 || argc > 2) {
usage();
/* NOTREACHED */
}
for (cp = conf_table; cp->name != NULL; cp++) {
if (strcmp(*argv, cp->name) == 0)
break;
}
if (cp->name == NULL) {
errx(1, "%s: unknown variable", *argv);
/* NOTREACHED */
}
if (cp->type == PATHCONF) {
if (argc != 2) usage();
} else {
if (argc != 1) usage();
}
switch (cp->type) {
case CONSTANT:
printf("%ld\n", cp->value);
break;
case CONFSTR:
errno = 0;
slen = confstr (cp->value, (char *) 0, (size_t) 0);
if (slen == 0 || slen == (size_t)-1) {
if (errno)
err(1, "%ld", cp->value);
else
errx(1, "%ld", cp->value);
}
if ((sval = malloc(slen)) == NULL)
err(1, NULL);
confstr(cp->value, sval, slen);
printf("%s\n", sval);
break;
case SYSCONF:
errno = 0;
if ((val = sysconf(cp->value)) == -1) {
if (errno != 0) {
err(1, NULL);
/* NOTREACHED */
}
printf ("undefined\n");
} else {
printf("%ld\n", val);
}
break;
case PATHCONF:
errno = 0;
if ((val = pathconf(argv[1], cp->value)) == -1) {
if (errno != 0) {
err(1, "%s", argv[1]);
/* NOTREACHED */
}
printf ("undefined\n");
} else {
printf ("%ld\n", val);
}
break;
}
exit (ferror(stdout));
}
static void
usage(void)
{
extern char *__progname;
(void)fprintf(stderr, "usage: %s name [pathname]\n", __progname);
exit(1);
}