Module Async_unix.Process.Output

collect_output_and_wait t closes stdin t and then begins collecting the output produced on t's stdout and stderr, continuing to collect output until t terminates and the pipes for stdout and stderr are closed. Usually when t terminates, the pipes are closed; however, t could fork other processes which survive after t terminates and in turn keep the pipes open -- wait will not become determined until both pipes are closed in all descendant processes.