> Hi,
>
> I'm writing a character device driver in which each minor device can be
> opened more than once. When a device is opened is there a way to associate
> some private data for each opened instance ? Thanks.
allocation is easy -- what is complex is looking up the private data
on each system calls because you usually have no reference to
which instance of the open() the syscall refers to.
A hack that can work in some cases (ioctl and some other calls do
include the necessary info) is to use the process id of the caller
to differentiate. But you must be careful about processes forking
and passing fd's to their children...
cheers
luigi
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