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/*
* Copyright 2000 Massachusetts Institute of Technology
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby
* granted, provided that both the above copyright notice and this
* permission notice appear in all copies, that both the above
* copyright notice and this permission notice appear in all
* supporting documentation, and that the name of M.I.T. not be used
* in advertising or publicity pertaining to distribution of the
* software without specific, written prior permission. M.I.T. makes
* no representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied
* warranty.
*
* THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
* ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
* SHALL M.I.T. 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/usr.bin/getconf/getconf.c,v 1.10 2006/12/06 12:00:26 maxim Exp $");
#include <sys/types.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <sysexits.h>
#include <unistd.h>
#include <libiosexec.h>
#include "getconf.h"
static void do_confstr(const char *name, int key);
static void do_sysconf(const char *name, int key);
static void do_pathconf(const char *name, int key, const char *path);
static void
usage(void)
{
fprintf(stderr,
"usage: getconf [-v prog_env] system_var\n"
" getconf [-v prog_env] path_var pathname\n");
exit(EX_USAGE);
}
int
main(int argc, char **argv)
{
int c, key, valid;
const char *name, *vflag, *alt_path;
intmax_t limitval;
vflag = NULL;
while ((c = getopt(argc, argv, "v:")) != -1) {
switch (c) {
case 'v':
vflag = optarg;
break;
default:
usage();
}
}
if ((name = argv[optind]) == NULL)
usage();
if (vflag != NULL) {
if ((valid = find_progenv(vflag, &alt_path)) == 0)
errx(EX_USAGE, "invalid programming environment %s",
vflag);
if (valid > 0 && alt_path != NULL) {
if (argv[optind + 1] == NULL)
execl(alt_path, "getconf", argv[optind],
(char *)NULL);
else
execl(alt_path, "getconf", argv[optind],
argv[optind + 1], (char *)NULL);
err(EX_OSERR, "execl: %s", alt_path);
}
if (valid < 0)
errx(EX_UNAVAILABLE, "environment %s is not available",
vflag);
}
if (argv[optind + 1] == NULL) { /* confstr or sysconf */
if ((valid = find_limit(name, &limitval)) != 0) {
if (valid > 0)
printf("%" PRIdMAX "\n", limitval);
else
printf("undefined\n");
return 0;
}
if ((valid = find_confstr(name, &key)) != 0) {
if (valid > 0)
do_confstr(name, key);
else
printf("undefined\n");
} else {
valid = find_sysconf(name, &key);
if (valid > 0) {
do_sysconf(name, key);
} else if (valid < 0) {
printf("undefined\n");
} else
errx(EX_USAGE,
"no such configuration parameter `%s'",
name);
}
} else {
valid = find_pathconf(name, &key);
if (valid != 0) {
if (valid > 0)
do_pathconf(name, key, argv[optind + 1]);
else
printf("undefined\n");
} else
errx(EX_USAGE,
"no such path configuration parameter `%s'",
name);
}
return 0;
}
static void
do_confstr(const char *name, int key)
{
size_t len;
int savederr;
savederr = errno;
errno = 0;
len = confstr(key, 0, 0);
if (len == 0) {
if (errno)
err(EX_OSERR, "confstr: %s", name);
else
printf("undefined\n");
} else {
char buf[len + 1];
confstr(key, buf, len);
printf("%s\n", buf);
}
errno = savederr;
}
static void
do_sysconf(const char *name, int key)
{
long value;
errno = 0;
value = sysconf(key);
if (value == -1 && errno != 0)
err(EX_OSERR, "sysconf: %s", name);
else if (value == -1)
printf("undefined\n");
else
printf("%ld\n", value);
}
static void
do_pathconf(const char *name, int key, const char *path)
{
long value;
errno = 0;
value = pathconf(path, key);
if (value == -1 && errno != 0)
err(EX_OSERR, "pathconf: %s", name);
else if (value == -1)
printf("undefined\n");
else
printf("%ld\n", value);
}
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