Accessing usb devices with USBDEVFS

[Danny Budik <dbudik@ist-traffic.com>]

I have a question that may or may not be related to hotplugging. I have 
noticed that when I plug in a USB device, it takes about 5 seconds for 
it to show up in /proc/bus/usb/001/xxx. I am using HAL to recognize when 
a USB device is plugged in and USBDEVFS to communicate with my device.

When I plug it in, dbus/HAL instantly recognizes it and sends me a 
message.  But when I make the function call to open it (using fopen on 
the file above) I get an error that the device is not found. In fact, it 
takes about 5 seconds for the device to show up in the /proc/bus/usb/ 
directory so I have to place a sleep(5) line in my C code before I am 
able to open the device.

My test machine is a PIII 733 with FC4, latest kernel, so it is a 
relatively slow machine. Is there a way to predict the time that it 
takes for the device to be accessible with USBDEVFS so that I don't have 
to hardcode the sleep statement?

Thanks,
Danny Budik


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