commit 21c887c5a09040bf41d272a9e729119956e48a3f
author David Brazdil <dbrazdil@google.com> Fri Sep 23 12:25:18 2022 +0100
committer David Brazdil <dbrazdil@google.com> Fri Oct 07 11:24:45 2022 +0100
tree 3eb1e98a6aacd9b8134172f5decc9520d456d2b9
parent cd8e35be036417c14c270a2ebc94e968d930c478

RpcBinder: Add AF_UNIX socketpair transport

Add support for running RpcBinder over unnamed Unix domain sockets
created by socketpair(). This is useful e.g. between parent/child
processes.

The implementation uses the initial socket pair only to create more
socket pairs for individual connections. This creates a natural mapping
to syscalls used on sockets bound to an address:

    socket()                socketpair()
    bind()                  n/a (preconnected)
    connect()               sendmsg()
    listen()                recvmsg()

Bug: 250685929
Test: atest binderRpcTest
Change-Id: Id4ff3946ddcfefe3592eb1149c61582f7369aa29