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
"Brian T. Brunner" wrote:
> As said, system() allows you to grep relatively directly from within a C
> program.
> Also you can fopen("/proc/bus/usb/devices","r"); (or any other part of /proc)
> and look at the contents yourself.
>
> Also suggested: this is a job for the driver, which could raise a signal
> to a process requesting one from the driver.
> Do you have driver source available? (I'm guessing you're writing the
> bastage).
>
> Large fast heavy robots..... with treads and a 125mm cannon?
>
> Brian Brunner
> [EMAIL PROTECTED]
> (610)796-5838
>
> >>> Tim Arney <[EMAIL PROTECTED]> 11/18/04 08:57AM >>>
> Hi Edward,
>
> So can I execute grep from within a C program?
>
> Is there no way you know of using the usb library directly?
>
> Cheers,
> Tim
>
> Quoting Edward <[EMAIL PROTECTED]>:
>
> > Hello Tim,
> >
> > My best bet would be to grep the /proc/bus/usb/devices file for your
> > joystick device.
> >
> > HTH
> > Edward
> >
> > ----- Original Message -----
> > From: "Tim Arney" <[EMAIL PROTECTED]>
> > To: <[EMAIL PROTECTED]>
> > Sent: Thursday, November 18, 2004 13:51
> > Subject: [Linux-usb-users] Detecting unplugged device
> >
> >
> > > Hi all,
> > >
> > > I've written a C/C++ program for controlling a robot with a USB joystick
> > > under linux. For this I'm using the joydev module. Some of our robots
> > > are quite large and fast, and a safety concern is with the joystick
> > > being unplugged, then the robot should stop. As it stands, when the
> > > joystick is disconnected the "read" call blocks as though there is no
> > > new data. I could open the joystick port as non-blocking, but then
> > > "read" just returns like there's no new data. What I really need to be
> > > able to do is determine whether the joystick is still attached, and I
> > > figure somewhere along the chain (kernel->usb->input->joystick) someone
> > > knows whether it's there, and my best guess would be the linux usb
> > > driver. So anyway, I'm essentially looking for a point in the right
> > > direction as to how I might test to see if the joystick is connected
> > > from my C/C++ program?
> > >
> > > If it helps I'm using Debian Sarge with Linux kernel 2.4.26 on an i686
> > > system.
> > >
> > > Thanks a lot,
> > > Tim
> > >
> > >
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