Reset the error on failing to find the C typesupport #274
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Signed-off-by: Chris Lalancette <clalancette@openrobotics.org>
The rcutils error_string is meant to be used like errno; it may or may not be set when entering a function, calling other functions may or may not set it, and it is up to the caller on how to handle all of that. make_message_value_type() and make_request_response_value_types() were not resetting the error properly, and so could leave a failure state around. Fix that here by mimicing code that exists elsewhere in rmw_cyclonedds_cpp. Signed-off-by: Chris Lalancette <clalancette@openrobotics.org>
eboasson
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Jan 5, 2021
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Thanks @clalancette! It looks good to me and it definitely does the trick (ros2/rmw#293 confirmed it).
Thanks for the review. I'm going to go ahead and make this a real PR and merge it. We can work on the rest of the failing tests over in ros2/rmw#293 . |
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The individual commits have more information, but essentially make sure to reset the error in between calls to probing for typesupport. This should fix the bulk of the test failures we are seeing in ros2/rmw#293 .
@eboasson Note that this is different than what we had discussed earlier. After talking to some more people, changing the contract of get_typesupport_handle_function is a little more dangerous than we want to attempt right now . So this is the more targeted, if less ideal, solution. I'll likely still open an issue to follow-up and change that contract, since the current contract seems a bit ugly.
CI for this change is in ros2/rmw#293 .