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Forum Topic - Create proc fs to send the arguments to the Driver: (2 Items)

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Sobin Thomas

08/29/2019 1:30 AM

post119840

Create proc fs to send the arguments to the Driver

Hi

I want to create a procfs entry to send the debug argument to the device driver at run time. 
Is it possible ?
Actually I want to enable the logs at run time. So I am thinking to modify a flag in procfs and poll same in the driver 
code.

Michael Tasche

08/29/2019 4:03 AM

post119841

Re: Create proc fs to send the arguments to the Driver

Hi Thomas, 

there is no dedicated procfs, like a Linux Kernel is providing.

a) Every qnx process can overtake some area in the qnx name-space. 
If you want to control your special driver only, your driver could generate a prefix in the name-space.
Lets say, your driver already uses the prefix "/dev/myDevice/IO" for normal work, you could additional attach "/dev/
myDevice/Debug" and connect the "IO_WRITE"-Entry. 
So, for example you later simply type "echo debug=42 > /dev/myDevice/IO/Debug"  to activate something in your driver.

b) Alternatively you could poll a file under "/dev/shmem" from time to time. This file could contain the debug-flags.
The simple RAM-Disk "/dev/shmem" is serviced by procnto and is available on every running QNX-system.

Regards
Michael

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