o avoid stdio in acquire_daemonlock() so we don't leak FILE * memory

o fix potential long vs. int mismatch in pid reading/writing.
  Note that we can't use pid_t for the type of the variable stashed
  in the pidfile since we don't have a scanf format for pid_t.  Use long
  instead since we know pid_t can't be bigger than a long.
o just return if closeflag is set, regardless of the value of fd
o fix potential (unwinnable?) race locking the pid file pointed out by dynamo.
  Using O_EXLOCK is not portable but it does help in these situations.

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