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Introduced the select() operation for backends as the WAIT_DATA macro approach is not very extensible and causes trouble when adding platform- specific codepaths. Signed-off-by: Stéphane Raimbault <stephane.raimbault@gmail.com>
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The send() and recv() functions of the backends might require more information than just a file descriptor, therefore pass the complete modbus_t structure. Signed-off-by: Stéphane Raimbault <stephane.raimbault@gmail.com>
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Renamed error_print() to _error_print() in order to indicate it's a private method and make it globally accessible so functions in modbus-rtu.c and modbus-tcp.c can make use of it as well. Signed-off-by: Stéphane Raimbault <stephane.raimbault@gmail.com>
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All private functions and constants are now prefixed by _. The modbus protocol uses entry points to call specific functions.
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- more coherent - namespace - opaque and smaller context - usual wording