[Merge Request] Let the implementation of `listen()` pick the highest backlog value
"cannot open server socket" should report reason
serv_init() is external and %m may not be accurate error cause, but better than nothing. thanks.
Apply the patch suggested by Moritz Barsnick
Apply the patch suggested from Moritz Barsnick
Apply a patch of listen() backlog suggested by Frank LENORMAND
ok, I will look into it. thanks
Fix some old bugs.