1 /*
2 *
3 * Copyright (c) International Business Machines Corp., 2001
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19
20 /*
21 * NAME
22 * shmget04.c
23 *
24 * DESCRIPTION
25 * shmget04 - test for EACCES error
26 *
27 * ALGORITHM
28 * create a shared memory segment without read or write permissions
29 * loop if that option was specified
30 * call shmget() with SHM_RW flag using TEST() macro
31 * check the errno value
32 * issue a PASS message if we get EACCES
33 * otherwise, the tests fails
34 * issue a FAIL message
35 * call cleanup
36 *
37 * USAGE: <for command-line>
38 * shmget04 [-c n] [-e] [-i n] [-I x] [-P x] [-t]
39 * where, -c n : Run n copies concurrently.
40 * -e : Turn on errno logging.
41 * -i n : Execute test n times.
42 * -I x : Execute test for x seconds.
43 * -P x : Pause for x seconds between iterations.
44 * -t : Turn on syscall timing.
45 *
46 * HISTORY
47 * 03/2001 - Written by Wayne Boyer
48 *
49 * RESTRICTIONS
50 * none
51 */
52 #include <pwd.h>
53 #include "ipcshm.h"
54
55 char *TCID = "shmget04";
56 int TST_TOTAL = 1;
57
58 char nobody_uid[] = "nobody";
59 struct passwd *ltpuser;
60
61 int shm_id_1 = -1;
62
main(int ac,char ** av)63 int main(int ac, char **av)
64 {
65 int lc;
66
67 tst_parse_opts(ac, av, NULL, NULL);
68
69 setup(); /* global setup */
70
71 /* The following loop checks looping state if -i option given */
72
73 for (lc = 0; TEST_LOOPING(lc); lc++) {
74 /* reset tst_count in case we are looping */
75 tst_count = 0;
76
77 /*
78 * use the TEST() macro to make the call
79 */
80
81 TEST(shmget(shmkey, SHM_SIZE, SHM_RW));
82
83 if (TEST_RETURN != -1) {
84 tst_resm(TFAIL, "call succeeded when error expected");
85 continue;
86 }
87
88 switch (TEST_ERRNO) {
89 case EACCES:
90 tst_resm(TPASS, "expected failure - errno = "
91 "%d : %s", TEST_ERRNO, strerror(TEST_ERRNO));
92 break;
93 default:
94 tst_resm(TFAIL, "call failed with an "
95 "unexpected error - %d : %s",
96 TEST_ERRNO, strerror(TEST_ERRNO));
97 break;
98 }
99 }
100
101 cleanup();
102
103 tst_exit();
104 }
105
106 /*
107 * setup() - performs all the ONE TIME setup for this test.
108 */
setup(void)109 void setup(void)
110 {
111 tst_require_root();
112
113 tst_sig(NOFORK, DEF_HANDLER, cleanup);
114
115 TEST_PAUSE;
116
117 /* Switch to nobody user for correct error code collection */
118 ltpuser = getpwnam(nobody_uid);
119 if (setuid(ltpuser->pw_uid) == -1) {
120 tst_resm(TINFO, "setuid failed to "
121 "to set the effective uid to %d", ltpuser->pw_uid);
122 perror("setuid");
123 }
124
125 /*
126 * Create a temporary directory and cd into it.
127 * This helps to ensure that a unique msgkey is created.
128 * See ../lib/libipc.c for more information.
129 */
130 tst_tmpdir();
131
132 /* get an IPC resource key */
133 shmkey = getipckey();
134
135 /* create a shared memory segment without read or access permissions */
136 if ((shm_id_1 = shmget(shmkey, SHM_SIZE, IPC_CREAT | IPC_EXCL)) == -1) {
137 tst_brkm(TBROK, cleanup, "Failed to create shared memory "
138 "segment in setup");
139 }
140 }
141
142 /*
143 * cleanup() - performs all the ONE TIME cleanup for this test at completion
144 * or premature exit.
145 */
cleanup(void)146 void cleanup(void)
147 {
148 /* if it exists, remove the shared memory resource */
149 rm_shm(shm_id_1);
150
151 tst_rmdir();
152
153 }
154