master process handling patch

[Patrick Goetz]

This is another debian patch with lots of changes (see attached).  I'm 
running out of time for tracing the validity of these and am hoping that 
someone else will take a look. This seems to apply to a rather important 
part of the whole system, so is probably worth a look.
(Yes, I can submit this to bugzilla, too, if it makes sense to do so.) 
Note one minor bug fix in the patch:

   +int read_msg(int fd, struct notify_message *msg)
   +{
   +    ssize_t r;
   +    size_t off = 0;
   +    int s = sizeof(struct notify_message);

should be
------ --

   +int read_msg(int fd, struct notify_message *msg)
   +{
   +    ssize_t r;
   +    size_t off = 0;
   +    size_t s = sizeof(struct notify_message);


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