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15564577
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2013-03-22T07:00:33.380
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2015-07-10T23:04:21.143
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2015-07-10T23:04:21.143
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What you have quoted is a <code>device-driver</code> implementation for <code>lights</code> in an Android Emulator. Hence, <code>int (*set_light)(struct light_device_t* dev, struct light_state_t const* state);</code> is actually a function pointer declaration. This means <code>set_light</code> is a pointer to a function taking a <code>light_device_t</code> pointer and <code>light_state_t</code> pointer while returning an <code>int</code> value. This is a typical implementation in Android source tree. This implementation is used to have a generic implementation for potentially <code>n</code> different cases i.e. based on a case, I may want to call a different function, but the way I set it up and the way I call it, is kept generic through this implementation. Coming to your next question of where is this invoked. Please refer to this <a href="http://androidxref.com/4.2.2_r1/xref/frameworks/base/services/jni/com_android_server_LightsService.cpp" rel="nofollow">source file</a>. In this file, the device is setup <a href="http://androidxref.com/4.2.2_r1/xref/frameworks/base/services/jni/com_android_server_LightsService.cpp#73" rel="nofollow">here</a> which will invoke the open method referred by you. Once the setup is complete and <code>device</code> is returned, the actual method is invoked in <code>setLight_native</code> method as shown <a href="http://androidxref.com/4.2.2_r1/xref/frameworks/base/services/jni/com_android_server_LightsService.cpp#125" rel="nofollow">here</a>.
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1. POClarifying on function calling
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1. PTAnswer
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1. USJonathan Leffler
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1. USGanesh
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