sysvipc/test-sysvshm.c

   1 /* Basic tests for SYSV shared memory functions.
   2    Copyright (C) 2016-2019 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 <support/support.h>
  29 #include <support/check.h>
  30 #include <support/temp_file.h>
  31
  32 /* These are for the temporary file we generate.  */
  33 static char *name;
  34 static int shmid;
  35
  36 static void
  37 remove_shm (void)
  38 {
  39   /* Enforce message queue removal in case of early test failure.
  40      Ignore error since the shm may already have being removed.  */
  41   shmctl (shmid, IPC_RMID, 0);
  42 }
  43
  44 static void
  45 do_prepare (int argc, char *argv[])
  46 {
  47   int fd = create_temp_file ("tst-sysvshm.", &name);
  48   if (fd == -1)
  49     FAIL_EXIT1 ("cannot create temporary file (errno=%d)", errno);
  50 }
  51
  52 #define PREPARE do_prepare
  53
  54 /* It is not an extensive test, but rather a functional one aimed to check
  55    correct parameter passing on kernel.  */
  56
  57 #define CHECK_EQ(v, k) \
  58   if ((v) != (k)) \
  59     FAIL_EXIT1("%d != %d", v, k)
  60
  61 #define SHM_MODE 0666
  62
  63 static int
  64 do_test (void)
  65 {
  66   atexit (remove_shm);
  67
  68   key_t key = ftok (name, 'G');
  69   if (key == -1)
  70     FAIL_EXIT1 ("ftok failed");
  71
  72   long int pgsz = sysconf (_SC_PAGESIZE);
  73   if (pgsz == -1)
  74     FAIL_EXIT1 ("sysconf (_SC_PAGESIZE) failed (errno = %d)", errno);
  75
  76   shmid = shmget(key, pgsz, IPC_CREAT | IPC_EXCL | SHM_MODE);
  77   if (shmid == -1)
  78     {
  79       if (errno == ENOSYS)
  80         FAIL_UNSUPPORTED ("shmget not supported");
  81       FAIL_EXIT1 ("shmget failed (errno=%d)", errno);
  82     }
  83
  84   /* Get shared memory kernel information and do some sanity checks.  */
  85   struct shmid_ds shminfo;
  86   if (shmctl (shmid, IPC_STAT, &shminfo) == -1)
  87     FAIL_EXIT1 ("shmctl with IPC_STAT failed (errno=%d)", errno);
  88
  89   if (shminfo.shm_perm.__key != key)
  90     FAIL_EXIT1 ("shmid_ds::shm_perm::key (%d) != %d",
  91                 (int) shminfo.shm_perm.__key, (int) key);
  92   if (shminfo.shm_perm.mode != SHM_MODE)
  93     FAIL_EXIT1 ("shmid_ds::shm_perm::mode (%o) != %o",
  94                 shminfo.shm_perm.mode, SHM_MODE);
  95   if (shminfo.shm_segsz != pgsz)
  96     FAIL_EXIT1 ("shmid_ds::shm_segsz (%lu) != %lu",
  97                 (long unsigned) shminfo.shm_segsz, pgsz);
  98
  99   /* Attach on shared memory and realize some operations.  */
 100   int *shmem = shmat (shmid, NULL, 0);
 101   if (shmem == (void*) -1)
 102     FAIL_EXIT1 ("shmem failed (errno=%d)", errno);
 103
 104   shmem[0]   = 0x55555555;
 105   shmem[32]  = 0x44444444;
 106   shmem[64]  = 0x33333333;
 107   shmem[128] = 0x22222222;
 108
 109   if (shmdt (shmem) == -1)
 110     FAIL_EXIT1 ("shmem failed (errno=%d)", errno);
 111
 112   shmem = shmat (shmid, NULL, SHM_RDONLY);
 113   if (shmem == (void*) -1)
 114     FAIL_EXIT1 ("shmem failed (errno=%d)", errno);
 115
 116   CHECK_EQ (shmem[0],   0x55555555);
 117   CHECK_EQ (shmem[32],  0x44444444);
 118   CHECK_EQ (shmem[64],  0x33333333);
 119   CHECK_EQ (shmem[128], 0x22222222);
 120
 121   if (shmdt (shmem) == -1)
 122     FAIL_EXIT1 ("shmem failed (errno=%d)", errno);
 123
 124   /* Finally free up the semnaphore resource.  */
 125   if (shmctl (shmid, IPC_RMID, 0) == -1)
 126     FAIL_EXIT1 ("semctl failed (errno=%d)", errno);
 127
 128   return 0;
 129 }
 130
 131 #include <support/test-driver.c>