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由 Peter Krempa 提交于
This patch adds another callback to a FDstream object. The original callback is used by the daemon stream driver to handle events. This callback is called if and only if the stream is about to be closed. This might be used to handle cleanup steps after a fdstream exits. This will be used later on in ensuring mutually exclusive access to consoles. * src/fdstream.c: - emit the callback, when stream is being closed - add data structures needed to handle the callback - add function to register callback * src/fdstream.h: - define function prototypes for the callback
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