1 /*
2 * Copyright (c) International Business Machines Corp., 2004
3 * Copyright (c) Linux Test Project, 2004-2017
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
16 /*
17 * DESCRIPTION
18 * hugeshmget03 - test for ENOSPC error
19 *
20 * HISTORY
21 * 03/2001 - Written by Wayne Boyer
22 * 04/2004 - Updated by Robbie Williamson
23 */
24
25 #include <limits.h>
26 #include "hugetlb.h"
27 #include "hugetlb.h"
28
29 /*
30 * The MAXIDS value is somewhat arbitrary and may need to be increased
31 * depending on the system being tested.
32 */
33 #define MAXIDS 8192
34 #define PATH_SHMMNI "/proc/sys/kernel/shmmni"
35
36 static size_t shm_size;
37 static int shm_id_1 = -1;
38 static int num_shms;
39 static int shm_id_arr[MAXIDS];
40
41 static long hugepages = 128;
42 static long orig_shmmni = -1;
43 static struct tst_option options[] = {
44 {"s:", &nr_opt, "-s num Set the number of the been allocated hugepages"},
45 {NULL, NULL, NULL}
46 };
47
test_hugeshmget(void)48 static void test_hugeshmget(void)
49 {
50 TEST(shmget(IPC_PRIVATE, shm_size,
51 SHM_HUGETLB | IPC_CREAT | IPC_EXCL | SHM_RW));
52 if (TST_RET != -1) {
53 tst_res(TFAIL, "shmget succeeded unexpectedly");
54 return;
55 }
56 if (TST_ERR == ENOSPC)
57 tst_res(TPASS | TTERRNO, "shmget failed as expected");
58 else
59 tst_res(TFAIL | TTERRNO, "shmget failed unexpectedly "
60 "- expect errno=ENOSPC, got");
61 }
62
setup(void)63 static void setup(void)
64 {
65 long hpage_size;
66
67 save_nr_hugepages();
68 if (nr_opt)
69 hugepages = SAFE_STRTOL(nr_opt, 0, LONG_MAX);
70
71 SAFE_FILE_SCANF(PATH_SHMMNI, "%ld", &orig_shmmni);
72
73 limit_hugepages(&hugepages);
74 set_sys_tune("nr_hugepages", hugepages, 1);
75 SAFE_FILE_PRINTF(PATH_SHMMNI, "%ld", hugepages / 2);
76
77 hpage_size = SAFE_READ_MEMINFO("Hugepagesize:") * 1024;
78 shm_size = hpage_size;
79
80 /*
81 * Use a while loop to create the maximum number of memory segments.
82 * If the loop exceeds MAXIDS, then break the test and cleanup.
83 */
84 num_shms = 0;
85 shm_id_1 = shmget(IPC_PRIVATE, shm_size,
86 SHM_HUGETLB | IPC_CREAT | IPC_EXCL | SHM_RW);
87 while (shm_id_1 != -1) {
88 shm_id_arr[num_shms++] = shm_id_1;
89 if (num_shms == MAXIDS)
90 tst_brk(TBROK, "The maximum number of "
91 "shared memory ID's has been reached. "
92 "Please increase the MAXIDS value in "
93 "the test.");
94 shm_id_1 = shmget(IPC_PRIVATE, shm_size,
95 SHM_HUGETLB | IPC_CREAT | IPC_EXCL | SHM_RW);
96 }
97 if (errno != ENOSPC)
98 tst_brk(TBROK | TERRNO, "shmget #setup");
99 }
100
cleanup(void)101 static void cleanup(void)
102 {
103 int i;
104
105 for (i = 0; i < num_shms; i++)
106 rm_shm(shm_id_arr[i]);
107
108 if (orig_shmmni != -1)
109 FILE_PRINTF(PATH_SHMMNI, "%ld", orig_shmmni);
110 restore_nr_hugepages();
111 }
112
113 static struct tst_test test = {
114 .needs_root = 1,
115 .options = options,
116 .setup = setup,
117 .cleanup = cleanup,
118 .test_all = test_hugeshmget,
119 };
120