rt_heap_create failure in user space

[Zhang Yuchen]

Problem solved!
Thanks!
 
Yuchen


  _____  

From: Dmitry Adamushko [mailto:dmitry.adamushko at datacon.at] 
Sent: Friday, August 12, 2005 1:52 PM
To: Zhang Yuchen
Cc: rtai at rtai.org
Subject: Re: rt_heap_create failure in user space



> Hi, list,
> 
> I am trying to create shared memory in user space by using rt_heap_create,
> but it fails with errno: No such file or directory. 
> The returned error code is -2 (ENOENT), which is very strange since it
> should not be returned by the function according to API doc. 
> Nothing special in my code, see below

skins/rtai/lib/heap.c:

static int __map_heap_memory (RT_HEAP *heap, RT_HEAP_PLACEHOLDER *php)
{
   int err, heapfd;

   /* Open the heap device to share the heap memory with the
      in-kernel skin and bound clients. */
   heapfd = open(XNHEAP_DEV_NAME,O_RDWR);

   if (heapfd < 0)
       return -ENOENT;

...

This routine, in turn, is called from rt_heap_create() in the same file.
That's how -ENOENT comes.

The reason, as you might have already guessed, is the absence of the proper
character device file.

#define XNHEAP_DEV_NAME  "/dev/rtheap"

At first, run "make devices" from a fusion's source directory or extract the
corresponding code and run it manualy in case there is no source directory
on the target system. Then run your program.


> Best regards,
> Zhang Yuchen
> MSc Student
> Control Engineering Group
> University of Twente
> The Netherlands
>  

---
Best regards,
Dmitry


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