change PIIODevice read* and write* methods size to "ssize_t"
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@@ -469,8 +469,8 @@ protected:
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PIPropertyStorage constructVariantDevice() const override;
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void configureFromVariantDevice(const PIPropertyStorage & d) override;
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bool configureDevice(const void * e_main, const void * e_parent = 0) override;
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int readDevice(void * read_to, int max_size) override;
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int writeDevice(const void * data, int max_size) override;
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ssize_t readDevice(void * read_to, ssize_t max_size) override;
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ssize_t writeDevice(const void * data, ssize_t max_size) override;
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DeviceInfoFlags deviceInfoFlags() const override;
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//! Executes when any read function was successful. Default implementation does nothing
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