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https://github.com/X11Libre/xf86-input-evdev.git
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75af278861
xf86WaitForInput() would call select() with zero timeout to discover if more input was ready. But we know that's always true at least once, since we're only ever called from the sigio handler (if silken is active) or from the main loop (if it's not and we selected readable). With nonblocking IO we can just spin around until we hit EAGAIN, which gets us down to n+1 syscalls per event instead of 2n.
xf86-input-evdev - Generic Linux input driver for the Xorg X server
Please submit bugs & patches to the Xorg bugzilla:
https://bugs.freedesktop.org/enter_bug.cgi?product=xorg
All questions regarding this software should be directed at the
Xorg mailing list:
http://lists.freedesktop.org/mailman/listinfo/xorg
The master development code repository can be found at:
git://anongit.freedesktop.org/git/xorg/driver/xf86-input-evdev
http://cgit.freedesktop.org/xorg/driver/xf86-input-evdev
For more information on the git code manager, see:
http://wiki.x.org/wiki/GitPage