1 /*************************************************************************/
2 /* Copyright (c) Crackerjack Project., 2007 */
3 /* */
4 /* This program is free software; you can redistribute it and/or modify */
5 /* it under the terms of the GNU General Public License as published by */
6 /* the Free Software Foundation; either version 2 of the License, or */
7 /* (at your option) any later version. */
8 /* */
9 /* This program is distributed in the hope that it will be useful, */
10 /* but WITHOUT ANY WARRANTY; without even the implied warranty of */
11 /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See */
12 /* the GNU General Public License for more details. */
13 /* */
14 /* You should have received a copy of the GNU General Public License */
15 /* along with this program; if not, write to the Free Software */
16 /* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA*/
17 /* */
18 /*************************************************************************/
19 /*************************************************************************/
20 /* */
21 /* File: unshare01.c */
22 /* */
23 /* Description: This tests the unshare() syscall. */
24 /* unshare() allows a process to disassociate parts of its */
25 /* execution context that are currently being shared with other */
26 /* processes. Part of the execution context, such as the namespace */
27 /* ,is shared implicitly when a new process is created using */
28 /* fork(2) or vfork(2), while other parts, such as virtual memory */
29 /* , may be shared by explicit request when creating a process */
30 /* using clone(2). */
31 /* */
32 /* The main use of unshare() is to allow a process to control its */
33 /* shared execution context without creating a new process. */
34 /* */
35 /* */
36 /* The flags argument is a bit mask that specifies which parts of */
37 /* the execution context should be unshared. This argument is */
38 /* specified by ORing together zero or more of the following cons- */
39 /* tants: */
40 /* */
41 /* CLONE_FILES: */
42 /* Reverse the effect of the clone(2) CLONE_FILES flag. */
43 /* Unshare the file descriptor table, so that the calling */
44 /* process no longer shares its file descriptors with any */
45 /* other process. */
46 /* CLONE_FS: */
47 /* Reverse the effect of the clone(2) CLONE_FS flag.Unshare*/
48 /* file system attributes, so that the calling process no */
49 /* longer shares its root directory, current directory, or */
50 /* umask attributes with any other process. */
51 /* CLONE_NEWNS: */
52 /* This flag has the same effect as the clone(2) CLONE_NEWNS*/
53 /* flag. Unshare the namespace, so that the calling process*/
54 /* has a private copy of its namespacei which is not shared*/
55 /* with any other process. Specifying this flag automat- */
56 /* ically implies CLONE_FS as well. */
57 /* */
58 /* If flags is specified as zero, then unshare() is a no-op; no */
59 /* changes are made to the calling process's execution context. */
60 /* */
61 /* Usage: <for command-line> */
62 /* unshare01 [-c n] [-e][-i n] [-I x] [-p x] [-t] */
63 /* where, -c n : Run n copies concurrently. */
64 /* -e : Turn on errno logging. */
65 /* -i n : Execute test n times. */
66 /* -I x : Execute test for x seconds. */
67 /* -P x : Pause for x seconds between iterations. */
68 /* -t : Turn on syscall timing. */
69 /* */
70 /* Total Tests: 1 */
71 /* */
72 /* Test Name: unshare01 */
73 /* History: Porting from Crackerjack to LTP is done by */
74 /* Manas Kumar Nayak maknayak@in.ibm.com> */
75 /********************************************************************************/
76
77 #define _GNU_SOURCE
78
79 #include <stdio.h>
80 #include <sys/wait.h>
81 #include <sys/types.h>
82 #include <sched.h>
83 #include <limits.h>
84 #include <unistd.h>
85 #include <sys/types.h>
86 #include <sys/syscall.h>
87 #include <errno.h>
88 #include <pwd.h>
89 #include <grp.h>
90 #include <string.h>
91 #include <sys/param.h>
92 #include <stdio.h>
93
94 #include "test.h"
95 #include "config.h"
96
97 char *TCID = "unshare01";
98 int testno;
99 int TST_TOTAL = 1;
100
101 #ifdef HAVE_UNSHARE
102
103 /* Extern Global Functions */
104 /******************************************************************************/
105 /* */
106 /* Function: cleanup */
107 /* */
108 /* Description: Performs all one time clean up for this test on successful */
109 /* completion, premature exit or failure. Closes all temporary */
110 /* files, removes all temporary directories exits the test with */
111 /* appropriate return code by calling tst_exit() function. */
112 /* */
113 /* Input: None. */
114 /* */
115 /* Output: None. */
116 /* */
117 /* Return: On failure - Exits calling tst_exit(). Non '0' return code. */
118 /* On success - Exits calling tst_exit(). With '0' return code. */
119 /* */
120 /******************************************************************************/
cleanup(void)121 void cleanup(void)
122 {
123
124 tst_rmdir();
125 }
126
127 /* Local Functions */
128 /******************************************************************************/
129 /* */
130 /* Function: setup */
131 /* */
132 /* Description: Performs all one time setup for this test. This function is */
133 /* typically used to capture signals, create temporary dirs */
134 /* and temporary files that may be used in the course of this */
135 /* test. */
136 /* */
137 /* Input: None. */
138 /* */
139 /* Output: None. */
140 /* */
141 /* Return: On failure - Exits by calling cleanup(). */
142 /* On success - returns 0. */
143 /* */
144 /******************************************************************************/
setup(void)145 void setup(void)
146 {
147 tst_require_root();
148
149 /* Capture signals if any */
150 /* Create temporary directories */
151 TEST_PAUSE;
152 tst_tmpdir();
153 }
154
main(int ac,char ** av)155 int main(int ac, char **av)
156 {
157 pid_t pid1;
158 int lc;
159 int rval;
160
161 tst_parse_opts(ac, av, NULL, NULL);
162
163 setup();
164
165 for (lc = 0; TEST_LOOPING(lc); ++lc) {
166 tst_count = 0;
167 for (testno = 0; testno < TST_TOTAL; ++testno) {
168
169 pid1 = fork(); //call to fork()
170 if (pid1 == -1) {
171 tst_brkm(TFAIL | TERRNO, cleanup,
172 "fork failed");
173 } else if (pid1 == 0) {
174 switch (unshare(CLONE_FILES)) {
175 case 0:
176 printf("unshare with CLONE_FILES call "
177 "succeeded\n");
178 rval = 0;
179 break;
180 case -1:
181 if (errno == ENOSYS)
182 rval = 1;
183 else {
184 perror("unshare failed");
185 rval = 2;
186 }
187 }
188 exit(rval);
189 } else {
190 if (wait(&rval) == -1)
191 tst_brkm(TBROK | TERRNO, cleanup,
192 "wait failed");
193 if (rval != 0 && WIFEXITED(rval)) {
194 switch (WEXITSTATUS(rval)) {
195 case 1:
196 tst_brkm(TCONF, cleanup,
197 "unshare not supported in "
198 "kernel");
199 break;
200 default:
201 tst_brkm(TFAIL, cleanup,
202 "unshare failed");
203 }
204 }
205 }
206
207 pid1 = fork();
208 if (pid1 == -1) {
209 tst_brkm(TFAIL | TERRNO, cleanup,
210 "fork failed");
211 } else if (pid1 == 0) {
212 switch (unshare(CLONE_FS)) {
213 case 0:
214 printf("unshare with CLONE_FS call "
215 "succeeded\n");
216 rval = 0;
217 break;
218 case -1:
219 if (errno == ENOSYS)
220 rval = 1;
221 else {
222 perror("unshare failed");
223 rval = 2;
224 }
225 }
226 exit(rval);
227 } else {
228 if (wait(&rval) == -1)
229 tst_brkm(TBROK | TERRNO, cleanup,
230 "wait failed");
231 if (rval != 0 && WIFEXITED(rval)) {
232 switch (WEXITSTATUS(rval)) {
233 case 1:
234 tst_brkm(TCONF, cleanup,
235 "unshare not supported in "
236 "kernel");
237 break;
238 default:
239 tst_brkm(TFAIL, cleanup,
240 "unshare failed");
241 }
242 }
243 }
244
245 pid1 = fork();
246 if (pid1 == -1) {
247 tst_brkm(TFAIL | TERRNO, cleanup,
248 "fork() failed.");
249 } else if (pid1 == 0) {
250 switch (unshare(CLONE_NEWNS)) {
251 case 0:
252 printf("unshare call with CLONE_NEWNS "
253 "succeeded\n");
254 rval = 0;
255 break;
256 case -1:
257 if (errno == ENOSYS)
258 rval = 1;
259 else {
260 perror("unshare failed");
261 rval = 2;
262 }
263 }
264 exit(rval);
265 } else {
266 if (wait(&rval) == -1)
267 tst_brkm(TBROK | TERRNO, cleanup,
268 "wait failed");
269 if (rval != 0 && WIFEXITED(rval)) {
270 switch (WEXITSTATUS(rval)) {
271 case 1:
272 tst_brkm(TCONF, cleanup,
273 "unshare not supported in "
274 "kernel");
275 break;
276 default:
277 tst_brkm(TFAIL, cleanup,
278 "unshare failed");
279 }
280
281 }
282
283 }
284
285 }
286
287 }
288 cleanup();
289 tst_exit();
290 }
291 #else
main(void)292 int main(void)
293 {
294 tst_brkm(TCONF, NULL, "unshare is undefined.");
295 }
296 #endif
297