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Lennart Poettering c55ae51e77 manager: don't ever busy loop when we get a notification message we can't process
If the kernel doesn't permit us to dequeue/process an incoming notification
datagram message it's still better to stop processing the notification messages
altogether than to enter a busy loop where we keep getting notified but can't
do a thing about it.

With this change, manager_dispatch_notify_fd() behaviour is changed like this:

- if an error indicating a spurious wake-up is seen on recvmsg(), ignore it
  (EAGAIN/EINTR)

- if any other error is seen on recvmsg() propagate it, thus disabling
  processing of further wakeups

- if any error is seen on later code in the function, warn about it but do not
  propagate it, as in this cas we're not going to busy loop as the offending
  message is already dequeued.
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systemd - System and Service Manager

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