Attachment 109267 Details for Bug 150260 – mmap_private.c

mmap_private.c

mmap_private.c (text/x-csrc; charset=us-ascii), 974 bytes, created by Alexander Best on 2010-09-20 17:50:07 UTC

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Creator: Alexander Best

Created: 2010-09-20 17:50:07 UTC

Size: 974 bytes

patch

obsolete

>#include <sys/types.h>
>#include <sys/mman.h>
>#include <stdio.h>
>#include <string.h>
>#include <unistd.h>
>#include <fcntl.h>
>#include <errno.h>
>
>int main()
>{
>   shm_unlink("/myshm");
>   int fd = shm_open("/myshm", O_CREAT | O_RDWR, 0644);
>   if(fd >= 0){
>      if(ftruncate(fd, 1000) < 0){
>         printf("Error truncating");
>	 close(fd);
>      }
>      else{
>         close(fd);
>         fd = shm_open("/myshm", O_RDONLY/*O_RDWR*/, 0644);
>         if(fd >= 0){
>            void *addr = mmap(0, 1000, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
>            if (MAP_FAILED == addr){
>               printf("mmap failed, errno: %s", strerror(errno));
>            }
>            else{
>               printf("mmap OK");
>               munmap(addr, 1000);
>            }
>            close(fd);
>         }
>         else{
>            printf("Error opening shmem");
>         }
>      }
>   }
>   else{
>      printf("Error creating shmem");
>   }
>   shm_unlink("/myshm");
>   return 0;
>}
>
>
>
>

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