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Forum Topic - open a device from the same process?:

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Michael Cranston

10/30/2008 1:31 PM

post15740

open a device from the same process?

Hello,

I am trying to unit test a simple resource manager.  The unit test process creates the resource manager just fine and I 
can see it registered in /dev/mydevice.

However, when I try to use open to access the device "/dev/mydevice" after creation, I get an error saying no such file 
or directory.

Is it not possible to open a device from the same process that created it?

If I move the resource manager code and start it as a separate process in the system, everything works fine.

Thoughts,

Thanks,
Mike

Sean Boudreau(deleted)

10/30/2008 1:34 PM

post15741

Re: open a device from the same process?

On Thu, Oct 30, 2008 at 01:31:37PM -0400, Michael Cranston wrote:
> Hello,
> 
> I am trying to unit test a simple resource manager.  The unit test process creates the resource manager just fine and 
I can see it registered in /dev/mydevice.
> 
> However, when I try to use open to access the device "/dev/mydevice" after creation, I get an error saying no such 
file or directory.
> 
> Is it not possible to open a device from the same process that created it?
> 
> If I move the resource manager code and start it as a separate process in the system, everything works fine.
> 
> Thoughts,

Look at the _RESMGR_FLAG_SELF flag in resmgr_attach().

-seanb

Michael Cranston

10/30/2008 1:55 PM

post15747

Re: open a device from the same process?

Thanks.  That did the trick.
Not sure how I missed that in the manual......

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