A command ran from emacs receives a "signal 1" while it does not when run in a shell

[François Fleuret]

Hi,

I am trying to write an elisp application to control vlc, the
multi-media player and I have a weird bug.

Vlc can be run in such a mode that it gets commands in stdin and send
results in stdout. If ran from a bash shell (in an xterm), I can for
instance send it "add file://toto.mp3\n" and it will play the given
mp3, if I send "stop\n", it will stop playing and wait for more
commands.

If I set up a process in emacs with start-process, set-process-filter
and set-process-sentinel, and send the first string with
process-send-string, it will play the mp3. But if I send the second
string, it will stop and then it will tells me (in its stdout) "signal
1 received" and dies. The sentinel in emacs will get "finished".

Did I miss something here?

-- 
François Fleuret