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("$FreeBSD$");
32
33 #include <sys/types.h>
34
35 #include <err.h>
36 #include <errno.h>
37 #include <stdbool.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <sysexits.h>
41 #include <unistd.h>
42
43 #include "getconf.h"
44
45 static void do_allsys(void);
46 static void do_allpath(const char *path);
47 static void do_confstr(const char *name, int key);
48 static void do_sysconf(const char *name, int key);
49 static void do_pathconf(const char *name, int key, const char *path);
50
51 static void
usage(void)52 usage(void)
53 {
54 fprintf(stderr,
55 "usage: getconf -a [pathname]\n"
56 " getconf [-v prog_env] system_var\n"
57 " getconf [-v prog_env] path_var pathname\n");
58 exit(EX_USAGE);
59 }
60
61 int
main(int argc,char ** argv)62 main(int argc, char **argv)
63 {
64 bool aflag;
65 int c, key, valid;
66 const char *name, *vflag, *alt_path;
67 intmax_t limitval;
68 uintmax_t ulimitval;
69
70 aflag = false;
71 vflag = NULL;
72 while ((c = getopt(argc, argv, "av:")) != -1) {
73 switch (c) {
74 case 'a':
75 aflag = true;
76 break;
77 case 'v':
78 vflag = optarg;
79 break;
80
81 default:
82 usage();
83 }
84 }
85
86 if (aflag) {
87 if (vflag != NULL)
88 usage();
89 if (argv[optind] == NULL)
90 do_allsys();
91 else
92 do_allpath(argv[optind]);
93 return (0);
94 }
95
96 if ((name = argv[optind]) == NULL)
97 usage();
98
99 if (vflag != NULL) {
100 if ((valid = find_progenv(vflag, &alt_path)) == 0)
101 errx(EX_USAGE, "invalid programming environment %s",
102 vflag);
103 if (valid > 0 && alt_path != NULL) {
104 if (argv[optind + 1] == NULL)
105 execl(alt_path, "getconf", argv[optind],
106 (char *)NULL);
107 else
108 execl(alt_path, "getconf", argv[optind],
109 argv[optind + 1], (char *)NULL);
110
111 err(EX_OSERR, "execl: %s", alt_path);
112 }
113 if (valid < 0)
114 errx(EX_UNAVAILABLE, "environment %s is not available",
115 vflag);
116 }
117
118 if (argv[optind + 1] == NULL) { /* confstr or sysconf */
119 if ((valid = find_unsigned_limit(name, &ulimitval)) != 0) {
120 if (valid > 0)
121 printf("%" PRIuMAX "\n", ulimitval);
122 else
123 printf("undefined\n");
124 return 0;
125 }
126 if ((valid = find_limit(name, &limitval)) != 0) {
127 if (valid > 0)
128 printf("%" PRIdMAX "\n", limitval);
129 else
130 printf("undefined\n");
131
132 return 0;
133 }
134 if ((valid = find_confstr(name, &key)) != 0) {
135 if (valid > 0)
136 do_confstr(name, key);
137 else
138 printf("undefined\n");
139 } else {
140 valid = find_sysconf(name, &key);
141 if (valid > 0) {
142 do_sysconf(name, key);
143 } else if (valid < 0) {
144 printf("undefined\n");
145 } else
146 errx(EX_USAGE,
147 "no such configuration parameter `%s'",
148 name);
149 }
150 } else {
151 valid = find_pathconf(name, &key);
152 if (valid != 0) {
153 if (valid > 0)
154 do_pathconf(name, key, argv[optind + 1]);
155 else
156 printf("undefined\n");
157 } else
158 errx(EX_USAGE,
159 "no such path configuration parameter `%s'",
160 name);
161 }
162 return 0;
163 }
164
165 static void
do_onestr(const char * name,int key)166 do_onestr(const char *name, int key)
167 {
168 size_t len;
169
170 errno = 0;
171 len = confstr(key, 0, 0);
172 if (len == 0 && errno != 0) {
173 warn("confstr: %s", name);
174 return;
175 }
176 printf("%s: ", name);
177 if (len == 0)
178 printf("undefined\n");
179 else {
180 char buf[len + 1];
181
182 confstr(key, buf, len);
183 printf("%s\n", buf);
184 }
185 }
186
187 static void
do_onesys(const char * name,int key)188 do_onesys(const char *name, int key)
189 {
190 long value;
191
192 errno = 0;
193 value = sysconf(key);
194 if (value == -1 && errno != 0) {
195 warn("sysconf: %s", name);
196 return;
197 }
198 printf("%s: ", name);
199 if (value == -1)
200 printf("undefined\n");
201 else
202 printf("%ld\n", value);
203 }
204
205 static void
do_allsys(void)206 do_allsys(void)
207 {
208
209 foreach_confstr(do_onestr);
210 foreach_sysconf(do_onesys);
211 }
212
213 static void
do_onepath(const char * name,int key,const char * path)214 do_onepath(const char *name, int key, const char *path)
215 {
216 long value;
217
218 errno = 0;
219 value = pathconf(path, key);
220 if (value == -1 && errno != EINVAL && errno != 0)
221 warn("pathconf: %s", name);
222 printf("%s: ", name);
223 if (value == -1)
224 printf("undefined\n");
225 else
226 printf("%ld\n", value);
227 }
228
229 static void
do_allpath(const char * path)230 do_allpath(const char *path)
231 {
232
233 foreach_pathconf(do_onepath, path);
234 }
235
236 static void
do_confstr(const char * name,int key)237 do_confstr(const char *name, int key)
238 {
239 size_t len;
240 int savederr;
241
242 savederr = errno;
243 errno = 0;
244 len = confstr(key, 0, 0);
245 if (len == 0) {
246 if (errno)
247 err(EX_OSERR, "confstr: %s", name);
248 else
249 printf("undefined\n");
250 } else {
251 char buf[len + 1];
252
253 confstr(key, buf, len);
254 printf("%s\n", buf);
255 }
256 errno = savederr;
257 }
258
259 static void
do_sysconf(const char * name,int key)260 do_sysconf(const char *name, int key)
261 {
262 long value;
263
264 errno = 0;
265 value = sysconf(key);
266 if (value == -1 && errno != 0)
267 err(EX_OSERR, "sysconf: %s", name);
268 else if (value == -1)
269 printf("undefined\n");
270 else
271 printf("%ld\n", value);
272 }
273
274 static void
do_pathconf(const char * name,int key,const char * path)275 do_pathconf(const char *name, int key, const char *path)
276 {
277 long value;
278
279 errno = 0;
280 value = pathconf(path, key);
281 if (value == -1 && errno != 0)
282 err(EX_OSERR, "pathconf: %s", name);
283 else if (value == -1)
284 printf("undefined\n");
285 else
286 printf("%ld\n", value);
287 }
288
289