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(fhandler_dev_dsp::Audio_out::Audio_out): Take pointer to encapsulating fhandler_dev_dsp as parameter. (fhandler_dev_dsp::Audio_in::Audio_in): Ditto. (fhandler_dev_dsp::Audio::Audio): Take pointer to encapsulating fhandler_dev_dsp as parameter and store in fh. (fhandler_dev_dsp::Audio_out::write): Change return type to int and return number of bytes written. Return -1 if waitforspace returns false and no bytes have been written so far. (fhandler_dev_dsp::Audio_out::waitforspace): Change return type to bool. Handle O_NONBLOCK. Make waiting loop interruptible and cancelable. Return false in any of these cases, otherwise true. (fhandler_dev_dsp::Audio_in::read): Set returned nBytes to -1 if waitfordata returns false and nothing has been read so far. (fhandler_dev_dsp::Audio_in::waitfordata): Change return type to bool. Handle O_NONBLOCK. Make waiting loop interruptible and cancelable. Return false in any of these cases, otherwise true. (fhandler_dev_dsp::write): Call Audio_out constructor with this as parameter. (fhandler_dev_dsp::read): Call Audio_in constructor with this as parameter.
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