On Tue, 2002-06-11 at 06:45, Poul-Henning Kamp wrote: > >The idea is simple: the same device(major,minor) can > >be opened several times by different processes (or > >possibly threads within the same process) and each > >process (thread) will have unique device instance. > > Sorry, but this wont work for a large number of reasons. > > For one thing none of the dup(2) or fork(2) like systemcalls > report what happens to the filedescriptors down to the > device drivers so you have no way to correctly track which > process or which instance you are working on.
Can't you kludge this by creating /dev/foo0 and when it is opened replacing it with a different minor number? Or perhaps /dev/foo0 as a symlink to /dev/foo0.0 and when it is opened create /dev/foo0.1 and change the symlink. This is obviously a different major,minor pair but those are the constraints in the system :) -- Daniel O'Connor software and network engineer for Genesis Software - http://www.gsoft.com.au "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum GPG Fingerprint - 9A8C 569F 685A D928 5140 AE4B 319B 41F4 5D17 FDD5 To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message
