Cleanly terminating asynchronous process after it reads stdin

Question

I'm starting a process with start-process and immediately calling set-process-sentinel to get notifications when it ends. After attaching the sentinel I send the buffer's contents to the process's stdin followed by EOF, like this:

(process-send-region proc (point-min) (point-max)) (process-send-eof proc)

I'm seeing the correct output in the process's output buffer, so I know it's working correctly to some degree.

But my sentinel reports that the process ends with event "exited abnormally with code 1", but I would like the process to end normally with the "finished" event. Why am I seeing this abnormal exit? What can I do to get a normal exit?

Answer 1

Turns out I was doing this correctly, and the process was correctly returning a 1 result. So the posted code is the correct thing to do.