Messages in this thread | | | Subject | Re: USB state change notification to user space | Date | Sun, 5 Sep 1999 16:42:00 +0200 | From | list.kernel@iahastie ... |
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On Sat, Sep 04 1999, Johannes Erdfelt wrote: > > A fourth possibility is some sort of signal, which makes sense in a way -- > > do we want the application to a) ask if there is a new device, b) wait for > > a new device, or c) be notified that there is a new device? It wouldn't be > > hard (I think) to write a callback function for the USB handler that an > > application can register with (i.e. a signal). It seems to me that option > > c) is the best, since it maps to the bus behavior best. > > Obviously, c) is the best, however it's difficult to do with signals. > Allocating a signal specifically for this is kind of a waste. Are you > thinking perhaps registering which singal should be raised by an ioctl? > > I was hoping to get something similar to c) with a poll interface. That > way it can block in poll or poll the fd along with other fd's the > program may need.
Someone recently mentioned doing poll on a proc entry, that might be a solution here as well.
-- * Jens Axboe <axboe@image.dk> * Linux CD-ROM Maintainer * http://www.kernel.dk
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