On 5/24/07, Robert P. J. Day <rpjday@xxxxxxxxxxxxxx> wrote:
question about the character device example used in the LDD3 book, p. 59, which talks about the "release" method. in suggesting that the release method shut down the device on last close, this suggests that the code is counting the number of open instances of the device. what's the best way to do that? the open() routine would obviously increment a counter, while release() would decrement it. but where would you keep that counter? and you'd obviously need one per inode (not one per filp). what's the cleanest way to do that? thanks.
I guess kref is something you should use here. Isn't it? or am i missing something here? thanks --psr
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