As I mentioned before, the joystick initialization crashes and causes a
segmentation fault on my machine. I have a Microsoft Sidewinder Force
Feedback 2 joystick, FG.9.8. on Fedora Core 3. athlon cpu and ati
radeon AIW video card.
I have isolated the problem code in file plib/src/js/jsLinux.cxx which
if I comment out this section of the jsLinux.cxx file I can compile and
run FlightGear:
// Remove any deadband value already done in the kernel.
// Since we have our own deadband management this is save to do so.
struct js_corr corr [ _JS_MAX_AXES ];
ioctl ( os->fd, JSIOCGCORR, corr );
for ( int i = 0; i < num_axes ; ++i ) {
if ( corr[ i ] . type == JS_CORR_BROKEN ) {
int nodeadband = ( corr[ i ] . coef[ 0 ] + corr[ i ] . coef
[ 1 ] ) / 2 ;
corr[ i ] . coef[ 0 ] = nodeadband ;
corr[ i ] . coef[ 1 ] = nodeadband ;
}
}
ioctl ( os->fd, JSIOCSCORR, corr );
The Segmentation Fault is caused by the first ioctl() call. It
overwrites more than the struct js_corr structure and corrupts the THIS
pointer. then the next line:
for ( int i =0; i< num_axes;++i)
generates a Segmentation Fault when it tries to access num_axes because
the THIS pointer is now pointing at 0x0010000 memory address.
I have been unable to figure out how to fix it but if someone can give
me some help I'm sure we can figure it out.
Thanks,
Doug.
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