src/testsuite/regression/posix/shm.c

   1 /*
   2  * Copyright (C) 2011-2013 Gilles Chanteperdrix <gch@xenomai.org>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining
   5  * a copy of this software and associated documentation files (the
   6  * "Software"), to deal in the Software without restriction, including
   7  * without limitation the rights to use, copy, modify, merge, publish,
   8  * distribute, sublicense, and/or sell copies of the Software, and to
   9  * permit persons to whom the Software is furnished to do so, subject to
  10  * the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included
  13  * in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  18  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
  19  * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  20  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  21  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <errno.h>
  27
  28 #include <unistd.h>
  29 #include <fcntl.h>
  30 #include <sys/mman.h>
  31
  32 #include "check.h"
  33
  34 #define SHM_NAME "/shm"
  35 #define SHM_SZ 16384
  36
  37 int main(void)
  38 {
  39         unsigned i;
  40         void *shm;
  41         int fd;
  42
  43         fprintf(stderr, "Checking posix skin shared memories\n");
  44
  45         fd = shm_open(SHM_NAME, O_RDWR | O_CREAT | O_EXCL, 0644);
  46         if (fd == -1 && errno == EEXIST) {
  47                 fprintf(stderr, "Removing previous shared memory\n");
  48                 check_unix(shm_unlink(SHM_NAME));
  49                 check_unix(fd = shm_open(SHM_NAME,
  50                                          O_RDWR | O_CREAT | O_EXCL, 0644));
  51         }
  52         check_unix(ftruncate(fd, SHM_SZ));
  53         shm = mmap(NULL, SHM_SZ, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
  54         check_unix(shm == MAP_FAILED ? -1 : 0);
  55         for (i = 0; i < SHM_SZ; i++)
  56                 if (((unsigned char *)shm)[i] != 0) {
  57                         fprintf(stderr, "Test 1 failed at byte %u\n", i);
  58                         check_unix(shm_unlink(SHM_NAME));
  59                         exit(EXIT_FAILURE);
  60                 }
  61
  62         /* Fill the shared memory */
  63         memset(shm, 0xA5, SHM_SZ);
  64         check_unix(munmap(shm, SHM_SZ));
  65         check_unix(close(fd));
  66
  67         check_unix(fd = shm_open(SHM_NAME, O_CREAT | O_RDWR, 0644));
  68
  69         /* Resize it */
  70         check_unix(ftruncate(fd, 2 * SHM_SZ));
  71         shm = mmap(NULL, 2 * SHM_SZ, PROT_READ, MAP_SHARED, fd, 0);
  72         check_unix(shm == MAP_FAILED ? -1 : 0);
  73
  74         /* Check contents */
  75         for (i = 0; i < SHM_SZ; i++)
  76                 if (((unsigned char *)shm)[i] != 0xA5) {
  77                         fprintf(stderr, "Test 2 failed at byte %u (%x)\n",
  78                                 i, ((unsigned char *)shm)[i]);
  79                         check_unix(shm_unlink(SHM_NAME));
  80                         exit(EXIT_FAILURE);
  81                 }
  82         for (i = SHM_SZ; i < 2 * SHM_SZ; i++)
  83                 if (((unsigned char *)shm)[i] != 0) {
  84                         fprintf(stderr, "Test 2 failed at byte %u (%x)\n",
  85                                 i, ((unsigned char *)shm)[i]);
  86                         check_unix(shm_unlink(SHM_NAME));
  87                         exit(EXIT_FAILURE);
  88                 }
  89         check_unix(munmap(shm, 2 * SHM_SZ));
  90         check_unix(close(fd));
  91         check_unix(shm_unlink(SHM_NAME));
  92
  93         fprintf(stderr, "posix skin shared memories: success\n");
  94         return EXIT_SUCCESS;
  95 }