aboutsummaryrefslogtreecommitdiff
path: root/sysvipc/test-sysvshm.c
blob: c7c25d24de7247da64229048294332ddda5cdfa1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
/* Basic tests for SYSV shared memory functions.
   Copyright (C) 2016-2019 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>

#include <support/support.h>
#include <support/check.h>
#include <support/temp_file.h>

/* These are for the temporary file we generate.  */
static char *name;
static int shmid;

static void
remove_shm (void)
{
  /* Enforce message queue removal in case of early test failure.
     Ignore error since the shm may already have being removed.  */
  shmctl (shmid, IPC_RMID, 0);
}

static void
do_prepare (int argc, char *argv[])
{
  int fd = create_temp_file ("tst-sysvshm.", &name);
  if (fd == -1)
    FAIL_EXIT1 ("cannot create temporary file (errno=%d)", errno);
}

#define PREPARE do_prepare

/* It is not an extensive test, but rather a functional one aimed to check
   correct parameter passing on kernel.  */

#define CHECK_EQ(v, k) \
  if ((v) != (k)) \
    FAIL_EXIT1("%d != %d", v, k)

#define SHM_MODE 0666

static int
do_test (void)
{
  atexit (remove_shm);

  key_t key = ftok (name, 'G');
  if (key == -1)
    FAIL_EXIT1 ("ftok failed");

  long int pgsz = sysconf (_SC_PAGESIZE);
  if (pgsz == -1)
    FAIL_EXIT1 ("sysconf (_SC_PAGESIZE) failed (errno = %d)", errno);

  shmid = shmget(key, pgsz, IPC_CREAT | IPC_EXCL | SHM_MODE);
  if (shmid == -1)
    {
      if (errno == ENOSYS)
	FAIL_UNSUPPORTED ("shmget not supported");
      FAIL_EXIT1 ("shmget failed (errno=%d)", errno);
    }

  /* Get shared memory kernel information and do some sanity checks.  */
  struct shmid_ds shminfo;
  if (shmctl (shmid, IPC_STAT, &shminfo) == -1)
    FAIL_EXIT1 ("shmctl with IPC_STAT failed (errno=%d)", errno);

  if (shminfo.shm_perm.__key != key)
    FAIL_EXIT1 ("shmid_ds::shm_perm::key (%d) != %d",
		(int) shminfo.shm_perm.__key, (int) key);
  if (shminfo.shm_perm.mode != SHM_MODE)
    FAIL_EXIT1 ("shmid_ds::shm_perm::mode (%o) != %o",
		shminfo.shm_perm.mode, SHM_MODE);
  if (shminfo.shm_segsz != pgsz)
    FAIL_EXIT1 ("shmid_ds::shm_segsz (%lu) != %lu",
		(long unsigned) shminfo.shm_segsz, pgsz);

  /* Attach on shared memory and realize some operations.  */
  int *shmem = shmat (shmid, NULL, 0);
  if (shmem == (void*) -1)
    FAIL_EXIT1 ("shmem failed (errno=%d)", errno);

  shmem[0]   = 0x55555555;
  shmem[32]  = 0x44444444;
  shmem[64]  = 0x33333333;
  shmem[128] = 0x22222222;

  if (shmdt (shmem) == -1)
    FAIL_EXIT1 ("shmem failed (errno=%d)", errno);

  shmem = shmat (shmid, NULL, SHM_RDONLY);
  if (shmem == (void*) -1)
    FAIL_EXIT1 ("shmem failed (errno=%d)", errno);

  CHECK_EQ (shmem[0],   0x55555555);
  CHECK_EQ (shmem[32],  0x44444444);
  CHECK_EQ (shmem[64],  0x33333333);
  CHECK_EQ (shmem[128], 0x22222222);

  if (shmdt (shmem) == -1)
    FAIL_EXIT1 ("shmem failed (errno=%d)", errno);

  /* Finally free up the semnaphore resource.  */
  if (shmctl (shmid, IPC_RMID, 0) == -1)
    FAIL_EXIT1 ("semctl failed (errno=%d)", errno);

  return 0;
}

#include <support/test-driver.c>