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 * shmget03.c
23 *
24 * DESCRIPTION
25 * shmget03 - test for ENOSPC error
26 *
27 * ALGORITHM
28 * create shared memory segments in a loop until reaching the system limit
29 * loop if that option was specified
30 * attempt to create yet another shared memory segment
31 * check the errno value
32 * issue a PASS message if we get ENOSPC
33 * otherwise, the tests fails
34 * issue a FAIL message
35 * call cleanup
36 *
37 * USAGE: <for command-line>
38 * shmget03 [-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
53 #include "ipcshm.h"
54
55 char *TCID = "shmget03";
56 int TST_TOTAL = 1;
57
58 /*
59 * The MAXIDS value is somewhat arbitrary and may need to be increased
60 * depending on the system being tested.
61 */
62 #define MAXIDS 8192
63
64 int shm_id_1 = -1;
65 int num_shms = 0;
66
67 int shm_id_arr[MAXIDS];
68
main(int ac,char ** av)69 int main(int ac, char **av)
70 {
71 int lc;
72
73 tst_parse_opts(ac, av, NULL, NULL);
74
75 setup(); /* global setup */
76
77 /* The following loop checks looping state if -i option given */
78
79 for (lc = 0; TEST_LOOPING(lc); lc++) {
80 /* reset tst_count in case we are looping */
81 tst_count = 0;
82
83 /*
84 * use the TEST() macro to make the call
85 */
86
87 TEST(shmget(IPC_PRIVATE, SHM_SIZE, IPC_CREAT | IPC_EXCL
88 | SHM_RW));
89
90 if (TEST_RETURN != -1) {
91 tst_resm(TFAIL, "call succeeded when error expected");
92 continue;
93 }
94
95 switch (TEST_ERRNO) {
96 case ENOSPC:
97 tst_resm(TPASS, "expected failure - errno = "
98 "%d : %s", TEST_ERRNO, strerror(TEST_ERRNO));
99 break;
100 default:
101 tst_resm(TFAIL, "call failed with an "
102 "unexpected error - %d : %s",
103 TEST_ERRNO, strerror(TEST_ERRNO));
104 break;
105 }
106 }
107
108 cleanup();
109
110 tst_exit();
111 }
112
113 /*
114 * setup() - performs all the ONE TIME setup for this test.
115 */
setup(void)116 void setup(void)
117 {
118
119 tst_sig(NOFORK, DEF_HANDLER, cleanup);
120
121 TEST_PAUSE;
122
123 /*
124 * Create a temporary directory and cd into it.
125 * This helps to ensure that a unique msgkey is created.
126 * See ../lib/libipc.c for more information.
127 */
128 tst_tmpdir();
129
130 /* get an IPC resource key */
131 shmkey = getipckey();
132
133 /*
134 * Use a while loop to create the maximum number of memory segments.
135 * If the loop exceeds MAXIDS, then break the test and cleanup.
136 */
137 while ((shm_id_1 = shmget(IPC_PRIVATE, SHM_SIZE, IPC_CREAT |
138 IPC_EXCL | SHM_RW)) != -1) {
139 shm_id_arr[num_shms++] = shm_id_1;
140 if (num_shms == MAXIDS) {
141 tst_brkm(TBROK, cleanup, "The maximum number of shared "
142 "memory ID's has been\n\t reached. Please "
143 "increase the MAXIDS value in the test.");
144 }
145 }
146
147 /*
148 * If the errno is other than ENOSPC, then something else is wrong.
149 */
150 if (errno != ENOSPC) {
151 tst_resm(TINFO, "errno = %d : %s", errno, strerror(errno));
152 tst_brkm(TBROK, cleanup, "Didn't get ENOSPC in test setup");
153 }
154 }
155
156 /*
157 * cleanup() - performs all the ONE TIME cleanup for this test at completion
158 * or premature exit.
159 */
cleanup(void)160 void cleanup(void)
161 {
162 int i;
163
164 /* remove the shared memory resources that were created */
165 for (i = 0; i < num_shms; i++) {
166 rm_shm(shm_id_arr[i]);
167 }
168
169 tst_rmdir();
170
171 }
172