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61 lines
1.8 KiB
Ruby
61 lines
1.8 KiB
Ruby
module Evdev
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module FFI
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extend Fiddle::BasicTypes
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extend Fiddle::Importer
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# Indirection to pass an int as an output argument.
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Int = union ["int value"]
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dlload("libevdev.so.2")
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# https://www.freedesktop.org/software/libevdev/doc/latest/
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extern "struct libevdev * libevdev_new ()"
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extern "int libevdev_set_fd ( struct libevdev * , int )"
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extern "void libevdev_free ( struct libevdev * )"
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extern "int libevdev_has_event_type ( const struct libevdev * , unsigned int )"
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extern "const char* libevdev_get_name ( const struct libevdev * )"
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extern "int libevdev_fetch_event_value ( const struct libevdev *, unsigned int, unsigned int, int *)"
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end
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# Checks whether any of the given keys (by symbol) are held.
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# Thus, this is an OR type of operation.
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def self.keys_held(keys)
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# Temp var for holding return value while we clean up.
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ret = false
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# `evdev` works on `/dev/input/event*` nodes.
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# Check them *all*. We can't know which is a keyboard.
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Dir.glob("/dev/input/event*").each do |dev_path|
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File.open(dev_path, "r") do |dev|
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fd = dev.fileno
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evdev = FFI.libevdev_new()
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if FFI.libevdev_set_fd(evdev, fd) != 0
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$stderr.puts("warning: Could not set fd for #{dev_path}.")
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else
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# 0 is the initial value.
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buf = FFI::Int.malloc(0)
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keys.each do |key_name|
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FFI.libevdev_fetch_event_value(
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evdev,
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Linux::InputEventCodes::EV_KEY,
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Linux::InputEventCodes.const_get(key_name),
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buf
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)
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# Delay returning until after we free'd
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ret = true if buf.value == 1
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end
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end
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FFI.libevdev_free(evdev)
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return ret if ret
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end
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end
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return false
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end
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end
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