From 9696d300803ab6fcb5ab2884cd65fe05696e7025 Mon Sep 17 00:00:00 2001
From: Jacques Garrigue <garrigue at math.nagoya-u.ac.jp>
Date: Tue, 16 Nov 1999 10:22:42 +0000
Subject: import labltk

git-svn-id: http://caml.inria.fr/svn/ocaml/branches/labltk@2531 f963ae5c-01c2-4b8c-9fe0-0dff7051ff02
---
 otherlibs/labltk/support/fileevent.ml | 64 +++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 otherlibs/labltk/support/fileevent.ml

(limited to 'otherlibs/labltk/support/fileevent.ml')

diff --git a/otherlibs/labltk/support/fileevent.ml b/otherlibs/labltk/support/fileevent.ml
new file mode 100644
index 0000000000..ffebc909b1
--- /dev/null
+++ b/otherlibs/labltk/support/fileevent.ml
@@ -0,0 +1,64 @@
+(* $Id$ *)
+
+open Unix
+open Protocol
+
+external add_file_input : file_descr -> cbid -> unit
+        =  "camltk_add_file_input"
+external rem_file_input : file_descr -> unit
+        =  "camltk_rem_file_input"
+external add_file_output : file_descr -> cbid -> unit
+        =  "camltk_add_file_output"
+external rem_file_output : file_descr -> unit
+        =  "camltk_rem_file_output"
+
+(* File input handlers *)
+
+let fd_table = Hashtbl.create 37 (* Avoid space leak in callback table *)
+
+let add_fileinput :fd callback:f =
+  let id = new_function_id () in
+  Hashtbl.add callback_naming_table key:id data:(fun _ -> f());
+  Hashtbl.add fd_table key:(fd, 'r') data:id;
+  if !Protocol.debug then begin
+    Protocol.prerr_cbid id; prerr_endline " for fileinput"
+  end;
+  add_file_input fd id
+
+let remove_fileinput :fd =
+  try
+    let id = Hashtbl.find fd_table key:(fd, 'r') in
+    clear_callback id;
+    Hashtbl.remove fd_table key:(fd, 'r');
+    if !Protocol.debug then begin
+      prerr_string "clear "; 
+      Protocol.prerr_cbid id;
+      prerr_endline " for fileinput"
+    end;
+    rem_file_input fd
+  with
+    Not_found -> ()
+
+let add_fileoutput :fd callback:f =
+  let id = new_function_id () in
+  Hashtbl.add callback_naming_table key:id data:(fun _ -> f());
+  Hashtbl.add fd_table key:(fd, 'w') data:id;
+  if !Protocol.debug then begin
+    Protocol.prerr_cbid id; prerr_endline " for fileoutput"
+  end;
+  add_file_output fd id
+
+let remove_fileoutput :fd =
+  try
+    let id = Hashtbl.find fd_table key:(fd, 'w') in
+    clear_callback id;
+    Hashtbl.remove fd_table key:(fd, 'w');
+    if !Protocol.debug then begin
+      prerr_string "clear "; 
+      Protocol.prerr_cbid id;
+      prerr_endline " for fileoutput"
+    end;
+    rem_file_output fd
+  with
+    Not_found -> ()
+
-- 
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