Re: Lost process output in pipe between Emacs and CVS

[Richard Stallman]

    But the fact that `cvs diff src/minibuf.c |(sleep 120; wc)' works
    correctly make me think that maybe it is a bug in Emacs.

It might be a bug in Emacs that fails to read everything coming thru
the pipe when the subprocess terminates.  Can you see if it is that?
Did you already check and see what happens when Emacs sees that the
subprocess has terminated?

sigchld_handler just sets a few flags; the real work is done
later on by the code that checks the flags.  For an async subprocess,
it is done in status_notify.  It has code to read any remaining
output, but there could be a bug in it.