1/* Basic tests for SYSV shared memory functions.
2 Copyright (C) 2016-2024 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library 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 the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <stdio.h>
20#include <stdlib.h>
21#include <errno.h>
22#include <string.h>
23#include <unistd.h>
24#include <sys/types.h>
25#include <sys/ipc.h>
26#include <sys/shm.h>
27
28#include <test-sysvipc.h>
29
30#include <support/support.h>
31#include <support/check.h>
32#include <support/temp_file.h>
33
34/* These are for the temporary file we generate. */
35static char *name;
36static int shmid;
37
38static void
39remove_shm (void)
40{
41 /* Enforce message queue removal in case of early test failure.
42 Ignore error since the shm may already have being removed. */
43 shmctl (shmid: shmid, IPC_RMID, buf: 0);
44}
45
46static void
47do_prepare (int argc, char *argv[])
48{
49 int fd = create_temp_file (base: "tst-sysvshm.", filename: &name);
50 if (fd == -1)
51 FAIL_EXIT1 ("cannot create temporary file (errno=%d)", errno);
52}
53
54#define PREPARE do_prepare
55
56/* It is not an extensive test, but rather a functional one aimed to check
57 correct parameter passing on kernel. */
58
59#define CHECK_EQ(v, k) \
60 if ((v) != (k)) \
61 FAIL_EXIT1("%d != %d", v, k)
62
63#define SHM_MODE 0666
64
65static int
66do_test (void)
67{
68 atexit (func: remove_shm);
69
70 key_t key = ftok (pathname: name, proj_id: 'G');
71 if (key == -1)
72 FAIL_EXIT1 ("ftok failed");
73
74 long int pgsz = sysconf (_SC_PAGESIZE);
75 if (pgsz == -1)
76 FAIL_EXIT1 ("sysconf (_SC_PAGESIZE) failed (errno = %d)", errno);
77
78 shmid = shmget(key: key, size: pgsz, IPC_CREAT | IPC_EXCL | SHM_MODE);
79 if (shmid == -1)
80 {
81 if (errno == ENOSYS)
82 FAIL_UNSUPPORTED ("shmget not supported");
83 FAIL_EXIT1 ("shmget failed (errno=%d)", errno);
84 }
85
86 TEST_COMPARE (shmctl (shmid, first_shm_invalid_cmd (), NULL), -1);
87 TEST_COMPARE (errno, EINVAL);
88
89 /* Get shared memory kernel information and do some sanity checks. */
90 struct shmid_ds shminfo;
91 if (shmctl (shmid: shmid, IPC_STAT, buf: &shminfo) == -1)
92 FAIL_EXIT1 ("shmctl with IPC_STAT failed (errno=%d)", errno);
93
94 if (shminfo.shm_perm.__key != key)
95 FAIL_EXIT1 ("shmid_ds::shm_perm::key (%d) != %d",
96 (int) shminfo.shm_perm.__key, (int) key);
97 if (shminfo.shm_perm.mode != SHM_MODE)
98 FAIL_EXIT1 ("shmid_ds::shm_perm::mode (%o) != %o",
99 shminfo.shm_perm.mode, SHM_MODE);
100 if (shminfo.shm_segsz != pgsz)
101 FAIL_EXIT1 ("shmid_ds::shm_segsz (%lu) != %lu",
102 (long unsigned) shminfo.shm_segsz, pgsz);
103
104 /* Attach on shared memory and realize some operations. */
105 int *shmem = shmat (shmid: shmid, NULL, shmflg: 0);
106 if (shmem == (void*) -1)
107 FAIL_EXIT1 ("shmem failed (errno=%d)", errno);
108
109 shmem[0] = 0x55555555;
110 shmem[32] = 0x44444444;
111 shmem[64] = 0x33333333;
112 shmem[128] = 0x22222222;
113
114 if (shmdt (shmaddr: shmem) == -1)
115 FAIL_EXIT1 ("shmem failed (errno=%d)", errno);
116
117 shmem = shmat (shmid: shmid, NULL, SHM_RDONLY);
118 if (shmem == (void*) -1)
119 FAIL_EXIT1 ("shmem failed (errno=%d)", errno);
120
121 CHECK_EQ (shmem[0], 0x55555555);
122 CHECK_EQ (shmem[32], 0x44444444);
123 CHECK_EQ (shmem[64], 0x33333333);
124 CHECK_EQ (shmem[128], 0x22222222);
125
126 if (shmdt (shmaddr: shmem) == -1)
127 FAIL_EXIT1 ("shmem failed (errno=%d)", errno);
128
129 /* Finally free up the semnaphore resource. */
130 if (shmctl (shmid: shmid, IPC_RMID, buf: 0) == -1)
131 FAIL_EXIT1 ("semctl failed (errno=%d)", errno);
132
133 return 0;
134}
135
136#include <support/test-driver.c>
137

source code of glibc/sysvipc/test-sysvshm.c