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 * shmget02.c
23 *
24 * DESCRIPTION
25 * shmget02 - check for ENOENT, EEXIST and EINVAL errors
26 *
27 * ALGORITHM
28 * create a shared memory segment with read & write permissions
29 * loop if that option was specified
30 * call shmget() using five different invalid cases
31 * check the errno value
32 * issue a PASS message if we get ENOENT, EEXIST or EINVAL
33 * otherwise, the tests fails
34 * issue a FAIL message
35 * call cleanup
36 *
37 * USAGE: <for command-line>
38 * shmget02 [-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 * 06/03/2008 Renaud Lottiaux (Renaud.Lottiaux@kerlabs.com)
50 * - Fix concurrency issue. The second key used for this test could
51 * conflict with the key from another task.
52 *
53 * RESTRICTIONS
54 * none
55 */
56
57 #include "ipcshm.h"
58
59 char *TCID = "shmget02";
60 int TST_TOTAL = 4;
61
62 int shm_id_1 = -1;
63 int shm_nonexisting_key = -1;
64 key_t shmkey2;
65
66 struct test_case_t {
67 int *skey;
68 int size;
69 int flags;
70 int error;
71 } TC[] = {
72 /* EINVAL - size is 0 */
73 {
74 &shmkey2, 0, IPC_CREAT | IPC_EXCL | SHM_RW, EINVAL},
75 /* EINVAL - size is negative */
76 // {&shmkey2, -1, IPC_CREAT | IPC_EXCL | SHM_RW, EINVAL},
77 /* EINVAL - size is larger than created segment */
78 {
79 &shmkey, SHM_SIZE * 2, SHM_RW, EINVAL},
80 /* EEXIST - the segment exists and IPC_CREAT | IPC_EXCL is given */
81 {
82 &shmkey, SHM_SIZE, IPC_CREAT | IPC_EXCL | SHM_RW, EEXIST},
83 /* ENOENT - no segment exists for the key and IPC_CREAT is not given */
84 /* use shm_id_2 (-1) as the key */
85 {
86 &shm_nonexisting_key, SHM_SIZE, SHM_RW, ENOENT}
87 };
88
main(int ac,char ** av)89 int main(int ac, char **av)
90 {
91 int lc;
92 int i;
93
94 tst_parse_opts(ac, av, NULL, NULL);
95
96 setup(); /* global setup */
97
98 /* The following loop checks looping state if -i option given */
99
100 for (lc = 0; TEST_LOOPING(lc); lc++) {
101 /* reset tst_count in case we are looping */
102 tst_count = 0;
103
104 /* loop through the test cases */
105 for (i = 0; i < TST_TOTAL; i++) {
106 /*
107 * Look for a failure ...
108 */
109
110 TEST(shmget(*(TC[i].skey), TC[i].size, TC[i].flags));
111
112 if (TEST_RETURN != -1) {
113 tst_resm(TFAIL, "call succeeded unexpectedly");
114 continue;
115 }
116
117 if (TEST_ERRNO == TC[i].error) {
118 tst_resm(TPASS, "expected failure - errno = "
119 "%d : %s", TEST_ERRNO,
120 strerror(TEST_ERRNO));
121 } else {
122 tst_resm(TFAIL, "call failed with an "
123 "unexpected error - %d : %s",
124 TEST_ERRNO, strerror(TEST_ERRNO));
125 }
126 }
127 }
128
129 cleanup();
130
131 tst_exit();
132 }
133
134 /*
135 * setup() - performs all the ONE TIME setup for this test.
136 */
setup(void)137 void setup(void)
138 {
139
140 tst_sig(NOFORK, DEF_HANDLER, cleanup);
141
142 TEST_PAUSE;
143
144 /*
145 * Create a temporary directory and cd into it.
146 * This helps to ensure that a unique msgkey is created.
147 * See ../lib/libipc.c for more information.
148 */
149 tst_tmpdir();
150
151 /* get an IPC resource key */
152 shmkey = getipckey();
153
154 /* Get an new IPC resource key. */
155 shmkey2 = getipckey();
156
157 if ((shm_id_1 = shmget(shmkey, SHM_SIZE, IPC_CREAT | IPC_EXCL |
158 SHM_RW)) == -1) {
159 tst_brkm(TBROK, cleanup, "couldn't create shared memory "
160 "segment in setup()");
161 }
162
163 /* Make sure shm_nonexisting_key is a nonexisting key */
164 while (1) {
165 while (-1 != shmget(shm_nonexisting_key, 1, SHM_RD)) {
166 shm_nonexisting_key--;
167 }
168 if (errno == ENOENT)
169 break;
170 }
171 }
172
173 /*
174 * cleanup() - performs all the ONE TIME cleanup for this test at completion
175 * or premature exit.
176 */
cleanup(void)177 void cleanup(void)
178 {
179 /* if it exists, remove the shared memory resource */
180 rm_shm(shm_id_1);
181
182 tst_rmdir();
183
184 }
185