[Xenomai-help] how to release file descriptor after application crash

[Xenomai-help] how to release file descriptor after application crash

[Jochen Behnke]

Hello,

is there any way to release a file descriptor associated with a rtdm device after an application crash ? The reason I'm asking this is the following:
My application uses a rtdm device that can only be used in exclusive mode. When the application crashes while the device was opened, I have to reboot the system in order be able to use the device again. Is there a way to release the file descriptor or to close the device without rebooting.

Regards

Jochen
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Re: [Xenomai-help] how to release file descriptor after application crash

[Sebastian Smolorz]

Jochen Behnke wrote:
> Hello,
>
> is there any way to release a file descriptor associated with a rtdm device
> after an application crash ? The reason I'm asking this is the following:
> My application uses a rtdm device that can only be used in exclusive mode.
> When the application crashes while the device was opened, I have to reboot
> the system in order be able to use the device again. Is there a way to
> release the file descriptor or to close the device without rebooting.

See the note to the description of rt_dev_close in the RTDM API documentation.
(http://www.xenomai.org/documentation/trunk/html/api/group__userapi.html#ga34c1ddf4e2deb727a1ab3cd648ce5d9)

-- 
Sebastian

Re: [Xenomai-help] how to release file descriptor after application crash

[Jan Kiszka]

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Sebastian Smolorz wrote:
> Jochen Behnke wrote:
>> Hello,
>>
>> is there any way to release a file descriptor associated with a rtdm device
>> after an application crash ? The reason I'm asking this is the following:
>> My application uses a rtdm device that can only be used in exclusive mode.
>> When the application crashes while the device was opened, I have to reboot
>> the system in order be able to use the device again. Is there a way to
>> release the file descriptor or to close the device without rebooting.
> 
> See the note to the description of rt_dev_close in the RTDM API documentation.
> (http://www.xenomai.org/documentation/trunk/html/api/group__userapi.html#ga34c1ddf4e2deb727a1ab3cd648ce5d9)
> 

For trunk, the paragraph about stalled descriptors need to be removed
(good that you referred to it). RTDM of upcoming Xenomai 2.4 performs
automatic file descriptor cleanup now.

Jan


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Re: [Xenomai-help] how to release file descriptor after application crash

[Jochen Behnke]

Hello Sebastian and Jan,

the following command line solved the problem :-)

# echo <fildescr_to_cleanup>   > /proc/xenomai/rtdm/open_fildes


Thanks for your help.

Regards

Jochen


> Sebastian Smolorz wrote:
> > Jochen Behnke wrote:
> >> Hello,
> >>
> >> is there any way to release a file descriptor associated with a rtdm device
> >> after an application crash ? The reason I'm asking this is the following:
> >> My application uses a rtdm device that can only be used in exclusive mode.
> >> When the application crashes while the device was opened, I have to reboot
> >> the system in order be able to use the device again. Is there a way to
> >> release the file descriptor or to close the device without rebooting.
> > 
> > See the note to the description of rt_dev_close in the RTDM API documentation.
> > (http://www.xenomai.org/documentation/trunk/html/api/group__userapi.html#ga34c1ddf4e2deb727a1ab3cd648ce5d9)
> > 
> 
> For trunk, the paragraph about stalled descriptors need to be removed
> (good that you referred to it). RTDM of upcoming Xenomai 2.4 performs
> automatic file descriptor cleanup now.
> 
> Jan
> 
> 
> 


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