liqinhui a7a47621fa net/local: Support the socketpair interface of local udp socket.
Add the proccessing logic of udp socketpair, and modify the
logic of sending and receiving for udp socketpair.

Verification:
 - Use the socketpair interface to create a pair of local udp sockets,
   and perform read and write operations.

Signed-off-by: liqinhui <liqinhui@xiaomi.com>
2023-07-12 03:31:43 +08:00
..
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