how to redirect from stdin to dev driver
Clash Royale CLAN TAG#URR8PPP
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I am writing a device driver and have implemented file_operations write method. I would also like to be able to just redirect to the device driver, e.g.:
echo "this text is sent to driver" > /dev/driver_name
I originally assumed this would magically work with the user space message being sent to the .write and the other parameters set accordingly. LDD3 chapter 3 has some code which is pretty similar to mine, and the authors refer to testing/playing around both by invoking the write method directly and by redirecting to the driver (as I desire to do), making me think that I am on the right track. However, when I tried redirecting to the driver, I received a "Permission denied" error and it did nothing.
Any direction/links/suggestions would be greatly appreciated.
kernel drivers kernel-modules devices
asked Apr 3 at 0:47
Jebus
114
add a comment |Â
up vote
0
down vote
favorite
I am writing a device driver and have implemented file_operations write method. I would also like to be able to just redirect to the device driver, e.g.:
echo "this text is sent to driver" > /dev/driver_name
I originally assumed this would magically work with the user space message being sent to the .write and the other parameters set accordingly. LDD3 chapter 3 has some code which is pretty similar to mine, and the authors refer to testing/playing around both by invoking the write method directly and by redirecting to the driver (as I desire to do), making me think that I am on the right track. However, when I tried redirecting to the driver, I received a "Permission denied" error and it did nothing.
Any direction/links/suggestions would be greatly appreciated.
kernel drivers kernel-modules devices
asked Apr 3 at 0:47
Jebus
114
Do you have permissions to write to the device file?
– Ignacio Vazquez-Abrams
Apr 3 at 1:23
I sudo'd the above echo line. the permissions are crw------- with root as owner.
– Jebus
Apr 3 at 1:56
You ran the echo with superuser privileges, not the shell.
– Ignacio Vazquez-Abrams
Apr 3 at 1:57
ty. How to make a driver install with different permissions?
– Jebus
Apr 3 at 2:08
add a comment |Â
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I am writing a device driver and have implemented file_operations write method. I would also like to be able to just redirect to the device driver, e.g.:
echo "this text is sent to driver" > /dev/driver_name
I originally assumed this would magically work with the user space message being sent to the .write and the other parameters set accordingly. LDD3 chapter 3 has some code which is pretty similar to mine, and the authors refer to testing/playing around both by invoking the write method directly and by redirecting to the driver (as I desire to do), making me think that I am on the right track. However, when I tried redirecting to the driver, I received a "Permission denied" error and it did nothing.
Any direction/links/suggestions would be greatly appreciated.
kernel drivers kernel-modules devices
asked Apr 3 at 0:47
Jebus
114
I am writing a device driver and have implemented file_operations write method. I would also like to be able to just redirect to the device driver, e.g.:
echo "this text is sent to driver" > /dev/driver_name
I originally assumed this would magically work with the user space message being sent to the .write and the other parameters set accordingly. LDD3 chapter 3 has some code which is pretty similar to mine, and the authors refer to testing/playing around both by invoking the write method directly and by redirecting to the driver (as I desire to do), making me think that I am on the right track. However, when I tried redirecting to the driver, I received a "Permission denied" error and it did nothing.
Any direction/links/suggestions would be greatly appreciated.
kernel drivers kernel-modules devices
asked Apr 3 at 0:47
Jebus
114
edited Apr 3 at 0:59
asked Apr 3 at 0:47
Jebus
114
asked Apr 3 at 0:47
Jebus
114
asked Apr 3 at 0:47
Jebus
114
114
Do you have permissions to write to the device file?
– Ignacio Vazquez-Abrams
Apr 3 at 1:23
I sudo'd the above echo line. the permissions are crw------- with root as owner.
– Jebus
Apr 3 at 1:56
You ran the echo with superuser privileges, not the shell.
– Ignacio Vazquez-Abrams
Apr 3 at 1:57
ty. How to make a driver install with different permissions?
– Jebus
Apr 3 at 2:08
add a comment |Â
Do you have permissions to write to the device file?
– Ignacio Vazquez-Abrams
Apr 3 at 1:23
I sudo'd the above echo line. the permissions are crw------- with root as owner.
– Jebus
Apr 3 at 1:56
You ran the echo with superuser privileges, not the shell.
– Ignacio Vazquez-Abrams
Apr 3 at 1:57
ty. How to make a driver install with different permissions?
– Jebus
Apr 3 at 2:08
Do you have permissions to write to the device file?
– Ignacio Vazquez-Abrams
Apr 3 at 1:23
Do you have permissions to write to the device file?
– Ignacio Vazquez-Abrams
Apr 3 at 1:23
I sudo'd the above echo line. the permissions are crw------- with root as owner.
– Jebus
Apr 3 at 1:56
I sudo'd the above echo line. the permissions are crw------- with root as owner.
– Jebus
Apr 3 at 1:56
You ran the echo with superuser privileges, not the shell.
– Ignacio Vazquez-Abrams
Apr 3 at 1:57
You ran the echo with superuser privileges, not the shell.
– Ignacio Vazquez-Abrams
Apr 3 at 1:57
ty. How to make a driver install with different permissions?
– Jebus
Apr 3 at 2:08
ty. How to make a driver install with different permissions?
– Jebus
Apr 3 at 2:08
add a comment |Â
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Do you have permissions to write to the device file?
– Ignacio Vazquez-Abrams
Apr 3 at 1:23
I sudo'd the above echo line. the permissions are crw------- with root as owner.
– Jebus
Apr 3 at 1:56
You ran the echo with superuser privileges, not the shell.
– Ignacio Vazquez-Abrams
Apr 3 at 1:57
ty. How to make a driver install with different permissions?
– Jebus
Apr 3 at 2:08