On 05/12/2011 06:15 AM, arethe rtai wrote:
> Hi all:
> I wirte a share memory program, but I found the share momory does
> not work while I try to take a communication between user space and
> kernel space.
> The task in kernel is OK, we can get the shared space. But the
> task in user space can not get the share memory.
> The code of the task in user space as follows:
What happens when the user-space tries to get the shared space?
>
> #include <stdio.h>
> #include <unistd.h>
> #include <sys/types.h>
> #include <sys/mman.h>
> #include <sys/stat.h>
> #include <fcntl.h>
> #include <rtai/rtai.h>
> #include <rtai/rtai_shm.h>
>
>
> int main(void)
> {
> unsigned int *adr;
>
> adr=(unsigned int *)rt_shm_alloc(0xaaaaa, sizeof(*adr), USE_VMALLOC);
>
> if (adr==NULL)
> printf("NULL pointer find \n");
>
> //rt_shm_free(0xaaaaa);
>
> printf("%d line \n",__LINE__);
>
> fflush(stdout);
>
> return 0;
>
> }
>
> BTW: I added some printf in file src/skins/rtai/shm.c, but they cannot
> be outputted to the console.
I doubt that very much. If printf did not work, a lot of application
would not work on your system.
--
Gilles.
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