DRI3 passes the drm fd over X protocol and as such we can't rely on
hooking open to discover the drm fd. Instead we look for drm ioctl
codes in the ioctl wrapper. If we don't have a drm fd and see
something that looks like a drm ioctl, we stat the fd to see if it's a
drm fd. If it is, we save it for later so we don't have to do an
extra stat on every ioctl. We can then drop the open wrapper, but we
keep the close wrapper so we can invalidate our cached drm_fd if it's
closed.
Signed-off-by: Kristian Høgsberg <krh@cryptic-dragon.jf.intel.com>
Kristian Høgsberg
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