getconf.c revision 99112 
1/*
2 * Copyright 2000 Massachusetts Institute of Technology
3 *
4 * Permission to use, copy, modify, and distribute this software and
5 * its documentation for any purpose and without fee is hereby
6 * granted, provided that both the above copyright notice and this
7 * permission notice appear in all copies, that both the above
8 * copyright notice and this permission notice appear in all
9 * supporting documentation, and that the name of M.I.T. not be used
10 * in advertising or publicity pertaining to distribution of the
11 * software without specific, written prior permission.  M.I.T. makes
12 * no representations about the suitability of this software for any
13 * purpose.  It is provided "as is" without express or implied
14 * warranty.
15 *
16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31__FBSDID("$FreeBSD: head/usr.bin/getconf/getconf.c 99112 2002-06-30 05:25:07Z obrien $");
32
33#include <sys/types.h>
34
35#include <err.h>
36#include <errno.h>
37#include <stdio.h>
38#include <stdlib.h>
39#include <sysexits.h>
40#include <unistd.h>
41
42#include "getconf.h"
43
44static void	do_confstr(const char *name, int key);
45static void	do_sysconf(const char *name, int key);
46static void	do_pathconf(const char *name, int key, const char *path);
47
48static void
49usage(void)
50{
51	fprintf(stderr, "usage:\n"
52		"\tgetconf [-v prog_model] system_var\n"
53		"\tgetconf [-v prog_model] path_var pathname\n");
54	exit(EX_USAGE);
55}
56
57int
58main(int argc, char **argv)
59{
60	int c;
61	const char *name, *vflag;
62	int key;
63
64	vflag = 0;
65
66	while ((c = getopt(argc, argv, "v:")) != -1) {
67		switch (c) {
68		case 'v':
69			vflag = optarg;
70			break;
71
72		default:
73			usage();
74		}
75	}
76
77	if (vflag)
78		warnx("-v %s ignored", vflag);
79
80	/* No arguments... */
81	if ((name = argv[optind]) == 0)
82		usage();
83
84	if (argv[optind + 1] == 0) { /* confstr or sysconf */
85		key = find_confstr(name);
86		if (key >= 0) {
87			do_confstr(name, key);
88		} else {
89			key = find_sysconf(name);
90			if (key >= 0)
91				do_sysconf(name, key);
92			else
93				errx(EX_USAGE,
94				     "no such configuration parameter `%s'",
95				     name);
96		}
97	} else {
98		key = find_pathconf(name);
99		if (key >= 0)
100			do_pathconf(name, key, argv[optind + 1]);
101		else
102			errx(EX_USAGE,
103			     "no such path configuration parameter `%s'",
104			     name);
105	}
106	return 0;
107}
108
109static void
110do_confstr(const char *name, int key)
111{
112	char *buf;
113	size_t len;
114
115	len = confstr(key, 0, 0);
116	if (len == (size_t)-1)
117		err(EX_OSERR, "confstr: %s", name);
118
119	if (len == 0) {
120		printf("undefined\n");
121	} else {
122		buf = alloca(len);
123		confstr(key, buf, len);
124		printf("%s\n", buf);
125	}
126}
127
128static void
129do_sysconf(const char *name, int key)
130{
131	long value;
132
133	errno = 0;
134	value = sysconf(key);
135	if (value == -1 && errno != 0)
136		err(EX_OSERR, "sysconf: %s", name);
137	else if (value == -1)
138		printf("undefined\n");
139	else
140		printf("%ld\n", value);
141}
142
143static void
144do_pathconf(const char *name, int key, const char *path)
145{
146	long value;
147
148	errno = 0;
149	value = pathconf(path, key);
150	if (value == -1 && errno != 0)
151		err(EX_OSERR, "pathconf: %s", name);
152	else if (value == -1)
153		printf("undefined\n");
154	else
155		printf("%ld\n", value);
156}
157