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passt/doc/platform-requirements/README
David Gibson 299c407501 doc: Add program to document and test assumptions about SO_REUSEADDR
For the approach we intend to use for handling UDP flows, we have some
pretty specific requirements about how SO_REUSEADDR works with UDP sockets.
Specifically SO_REUSEADDR allows multiple sockets with overlapping bind()s,
and therefore there can be multiple sockets which are eligible to receive
the same datagram.  Which one will actually receive it is important to us.

Add a test program which verifies things work the way we expect, which
documents what those expectations are in the process.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
2024-07-05 15:26:43 +02:00

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Platform Requirements
=====================
TODO: document the various Linux specific features we currently require
Test Programs
-------------
In some places we rely on quite specific behaviour of sockets.
Although Linux, at least, seems to behave as required, It's not always
clear from the available documentation if this is required by POSIX or
some other specification.
To specifically document those expectations this directory has some
test programs which explicitly check for the behaviour we need.
When/if we attempt a port to a new platform, running these to check
behaviour would be a good place to start.