[9fans] writing to ctl using fprint and write

[EBo]

I'm working on some regression testing for my GSoC project and am trying
to understand why 

  ctl = open(path("ctl"),ORDWR|OAPPEND);
  ts = "chatty9p 1"; // or some other message

  n = fprint(ctl, ts);

succeeds, while

  n = write(ctl,ts,sizeof(ts));

fails.

Can someone explain?

  EBo --