Hi all,
I've solved this, in what seems to be a more efficient way. I now use the linux input drivers to read the device (as mapped onto /dev/input/event#), and under this kernel module (evdev, which is standard in kernels >= 2.4) read() returns in blocking mode when the device disconnects and errno is set to ENODEV.
Thanks to everyone who has offered their help.
Cheers, Tim
----- Original Message ----- From: "Alan Stern" <[EMAIL PROTECTED]>
To: "Tim Arney" <[EMAIL PROTECTED]>
Cc: "Brian T. Brunner" <[EMAIL PROTECTED]>; "Edward" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Tuesday, November 23, 2004 5:53 AM
Subject: Re: [Linux-usb-users] Detecting unplugged device
On Fri, 19 Nov 2004, Tim Arney wrote:
Hi Brian, Edward, and Sven,
Checking out /proc/bus/usb/devices seems to work, so thanks for your help. I fear it
isn't a complete enough solution, but it will have to do in the meantime. If anyone
else knows a way to possibly trace the connection back through the joystick port it
is registered under, that would be appreciated.
Regarding the large, fast, heavy robots...treaded yes, but still waiting on the
cannon ;)
Cheers, Tim
A better way to do this is to open the /proc/bus/usb/bbb/ddd file corresponding to your device and periodically try to read the first few bytes of the file. When the device disconnects, read() will fail with errno set to ENODEV.
Maybe even better, you can use the case USBDEVFS_DISCSIGNAL ioctl available in usbfs. It will cause your process to receive a signal when then device is disconnected. Unfortunately I don't know how or if that ioctl is presented in libusb.
Alan Stern
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