I am writing a resource manager, and in that I want to handle multiple
devices. (And I don’t want to reserve space for all the device at the
time of attaching it to the resource manager, means providing the
flexibility at the run time for creation and deletion of the N number
of devices under this directory).
For this I attach a directory “/dev/sample” into the resource manager.
Now I can perform the operations on the devices, named
“/dev/sample/sample0”,
“/dev/sample/sample1”,…"/dev/sample/sampleX". Each time I gets
the different FD as I should expect.
Now when I perform the Write operation, lets say on device
“/dev/sample/sample2”, but I am getting the data even I read from any
device “/dev/sample/sampleX”. This means that these logical devices
could not be differentiated in the underlaying architecture.
Any idea how to differentiate between these logical devices.
When I do SELECT on these FD’s , I always get the data into the
largest FD, irrespective of on which FD i wrote the data.
I am writing a resource manager, and in that I want to handle multiple
devices. (And I don’t want to reserve space for all the device at the
time of attaching it to the resource manager, means providing the
flexibility at the run time for creation and deletion of the N number
of devices under this directory).
For this I attach a directory “/dev/sample” into the resource manager.
Now I can perform the operations on the devices, named
“/dev/sample/sample0”,
“/dev/sample/sample1”,…"/dev/sample/sampleX". Each time I gets
the different FD as I should expect.
Now when I perform the Write operation, lets say on device
“/dev/sample/sample2”, but I am getting the data even I read from any
device “/dev/sample/sampleX”. This means that these logical devices
could not be differentiated in the underlaying architecture.
Any idea how to differentiate between these logical devices.
When I do SELECT on these FD’s , I always get the data into the
largest FD, irrespective of on which FD i wrote the data.
But I think creating the OCB structure for each open will also help.
In case of multiple open, the created OCB ( for the first time) was
linked to all the open, resulting in the one OCB structure. So what
we need to do is that for each OPEN, create the OCB and attach to the
resource manager.
and then RM will map the fd to OCB for further reference to that
device.