=== modified file 'ppio.ml'
--- ppio.ml	2019-04-11 19:04:04 +0000
+++ ppio.ml	2019-04-11 18:49:43 +0000
@@ -59,23 +59,8 @@
 
 let main {hideendl; endl; color; exe} =
   pe ((show_cmd_args {hideendl; endl; color; exe})^"\n");
-  let fd0 = Unix.File_descr.of_int 0 in
-  let fd1 = Unix.File_descr.of_int 1 in
-  let stdin_r, stdin_w = Unix.pipe () in
-  let stdout_r, stdout_w = Unix.pipe () in
-  printf "pipes: (%d %d) (%d %d)\n%!" 
-    (Core.Unix.File_descr.to_int stdin_r)
-    (Core.Unix.File_descr.to_int stdin_w)
-    (Core.Unix.File_descr.to_int stdout_r)
-    (Core.Unix.File_descr.to_int stdout_w)
-  ;
   let pid = Subprocess.create_process
-    ~redirects:[
-      fd0, Subprocess.Redirect stdin_r;
-      fd1, Subprocess.Redirect stdout_w;
-      stdin_w, Subprocess.Close;
-      stdout_r, Subprocess.Close;
-    ]
+    ~redirects:[]
     (List.nth_exn exe 0) (List.to_array exe)
   in
   printf "pid: %d\n%!" pid;