The errno of mmap that is called in function __map_shm_heap_memory()
is 22, namely, EINVAL.
Is there someone successfully run the shared memory under rtai skins.

2011/5/12 Gilles Chanteperdrix <gilles.chanteperd...@xenomai.org>:
> 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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