Neil Booth e6020975a5 daemon: prevent races by opening with O_EXCL ...

Rework the way the daemon and server are created.  If we might
want to create a daemon, try to grab the lockfile with O_EXCL.
If we got it, create a server and daemon, otherwise try and
connect to the server.  If connecting to the server fails (including
after sleeping a little in case the server was recently created),
remove the lockfile and start over.

Other fix: shut down network gracefully on daemon exit.

Fixes #1638

2016-01-31 14:46:03 +09:00

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