refactor(s2n-quic-platform): move more syscalls to syscall module #1775
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Description of changes:
Currently, the msg/mmsg syscalls require a particular not-so-flexible interface to be implemented to interact with them. This PR moves the actual syscall to a simple function to make it easier to use in more contexts.
This is needed to separate the endpoint task from the IO operations.
Call-outs:
I've added a few changes to add GRO support in the syscalls while I was here to minimize the merge conflicts.
I also have not refactored the old syscalls to use the new functions, as that implementation will be deleted in a later PR.
Testing:
There's not really a great way to test the syscalls on their own, however tests are coming in a later PR that tests them in context of the tokio IO provider.
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.