In message <[EMAIL PROTECTED]>, [EMAIL PROTECTED] writ
es:
>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 ?
As other people have noted, not in the general case.
The solution I've used is to split the device minor number into a physical
unit and open instance part. You keep the existing per-unit structure, and
add per-instance data including a busy flag which causes opens to return
EBUSY. In your user land application, you iterate over the devices in
round-robin fashion as long as you get back EBUSY as you would for pty
masters.
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