Thanks. How would I go about checking to see if a card is in the drive? Trying to open() the block device and see if it succeeds?
cheers, John. ----- Original Message ----- From: "Alan Stern" <[EMAIL PROTECTED]> To: "John Matthews" <[EMAIL PROTECTED]> Cc: <[EMAIL PROTECTED]> Sent: Thursday, August 12, 2004 2:43 PM Subject: Re: [Linux-usb-users] Compact Flash Reader : Detecting that a card has been inserted. > On Thu, 12 Aug 2004, John Matthews wrote: > > > Hi, > > > > I have a standard usb compact flash reader which works using the usb-storage > > section of the kernel. > > > > I need to know when a card is being inserted. Windows knows this so it must > > be possible. Has anyone ever attempted to get this working on linux? > > Does/could hotplug deal with this? > > > > All information gratefully recieved, > > > > John Matthews. > > There may be people who have solved this problem, but I can't point you to > any. Hotplug won't help, since inserting a card doesn't generate a > hotplug event until the kernel realizes the card is there. The only way > this can happen is for a user process to try to access the card; there's > no way for the reader to tell the kernel that a card has been inserted > until the kernel asks, and the kernel won't ask on its own. > > So the only possibility is to have a program which periodically (once a > second or once every few seconds) queries the reader. I believe that's > how Windows does it. > > Alan Stern > > > ------------------------------------------------------- SF.Net email is sponsored by Shop4tech.com-Lowest price on Blank Media 100pk Sonic DVD-R 4x for only $29 -100pk Sonic DVD+R for only $33 Save 50% off Retail on Ink & Toner - Free Shipping and Free Gift. http://www.shop4tech.com/z/Inkjet_Cartridges/9_108_r285 _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
