if(chown(daemon->pidfile, cfg_uid, cfg_gid) == -1) {
                            verbose(VERB_QUERY, "cannot chown %u.%u %s: %s",
                                    (unsigned)cfg_uid, (unsigned)cfg_gid,
                                    daemon->pidfile, strerror(errno));
                    }

   -p, --pidfile pid-file
          Check whether a process has created the file pid-file.
          Note:  using  this  matching option alone might cause unintended
          processes to be acted on, if the old process terminated  without
          being able to remove the pid-file.
          Warning:  using  this match option with a world-writable pidfile
          or using it alone with a daemon that writes the  pidfile  as  an
          unprivileged  (non-root)  user  will  be  refused  with an error
          (since version 1.19.3) as  this  is  a  security  risk,  because
          either  any  user  can  write  to  it,  or  if  the  daemon gets
          compromised, the contents of the pidfile cannot be trusted,  and
          then  a  privileged  runner  (such as an init script executed as
          root)  would  end  up  acting  on  any  system  process.   Using
          /dev/null is exempt from these checks.