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Inconsistent static getaddrinfo() behavior on AI_CANONNAME #494

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@fantix

Description

@fantix

Testing script:

import socket
print(
    socket.getaddrinfo(
        '127.0.0.1',
        80,
        type=socket.SOCK_STREAM,
    )[0][3],  # ai_canonname
    socket.getaddrinfo(
        '127.0.0.1',
        80,
        type=socket.SOCK_STREAM,
        flags=socket.AI_CANONNAME,
    )[0][3],  # ai_canonname
)

Testing result:

Platform flags=AI_CANONNAME flags=0
Linux glibc "127.0.0.1" ""
Linux musl "127.0.0.1" "127.0.0.1"
macOS "" ""
uvloop "" ""

Expected result: uvloop __static_getaddrinfo_pyaddr() returns consistent result as the platform std C lib returns.

UPDATE: we would expect __static_getaddrinfo_pyaddr() honor the AI_CANONNAME flag.

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