Potential crash because of exception in WL event handler

[iusyk]

Description

Event handler OnDevice is registered in wl_drm_listener
The code of the handler make the instance(in heap) of type DisplayWayland.
The class DisplayWayland inherits the Drm::Display, the ctor of which can throw the exception (type Exception)
In general - event handler must not throw the exception because there are not any guarantees that C code can handle it
see code

void WaylandZCopy::onDevice(const string& name)
{
lock_guard lock(mMutex);

LOG(mLog, DEBUG) << "onDevice name: " << name;

mDrmDevice.reset(new Drm::DisplayWayland(name));

authenticate();

}

Display::Display ()
{
...
if (mDrmFd < 0)
{
throw Exception("Cannot open DRM device: " + mName, errno);
}
...
if (drmGetCap(mDrmFd, DRM_CAP_DUMB_BUFFER, &hasDumb) < 0 || !hasDumb)
{
throw Exception("Drm device does not support dumb buffers", errno);
}
}

Solution

Wrap code inside OnDevice in block try{}catch(const Exception&){}

[iusyk]

fix #129