OK. I did just a bare minimum checks.
The file is called mux.c, the function is "void muxserver_listen(void)" at line
1241.
Two comments seem quite important:
/*
* Use a temporary path before listen so we can pseudo-atomically
* establish the listening socket in its final location to avoid
* other processes racing in between bind() and listen() and hitting
* an unready socket.
*/
and
/* Now atomically "move" the mux socket into position */
Unluckily I haven't enough time to go on. Maybe later...
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https://bugs.launchpad.net/bugs/1593657
Title:
ControlPath unix socket is created in a weird way
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