1 files changed, 111 insertions, 0 deletions
diff --git a/otherlibs/labltk/support/cltkFile.c b/otherlibs/labltk/support/cltkFile.c
new file mode 100644
index 000000000..a890aba11
--- /dev/null
+++ b/otherlibs/labltk/support/cltkFile.c
@@ -0,0 +1,111 @@
+#ifdef _WIN32
+#include <wtypes.h>
+#include <winbase.h>
+#include <winsock.h>
+#endif
+#include <tcl.h>
+#include <tk.h>
+#include <caml/mlvalues.h>
+#include "camltk.h"
+
+/*
+ * File descriptor callbacks
+ */
+
+void FileProc(ClientData clientdata, int mask)
+{
+  callback2(*handler_code,Val_int(clientdata),Val_int(0));
+}
+
+/* Map Unix.file_descr values to Tcl file handles */
+
+#ifndef _WIN32
+
+/* Unix system */
+
+#if TCL_MAJOR_VERSION >= 8
+#define tcl_filehandle(fd) Int_val(fd)
+#define Tcl_File int
+#define Tcl_FreeFile(fd)
+#else
+static Tcl_File tcl_filehandle(value fd)
+{
+  return Tcl_GetFile((ClientData)Long_val(fd), TCL_UNIX_FD);
+}
+#endif
+
+#else
+
+/* Windows */
+
+#define Handle_val(v) (*((HANDLE *)(v)))
+
+static Tcl_File tcl_filehandle(value fd)
+{
+  HANDLE h = Handle_val(fd);
+  int type;
+  int optval, optsize;
+
+  optsize = sizeof(optval);
+  if (getsockopt((SOCKET) h, SOL_SOCKET, SO_TYPE, &optval, &optsize) == 0)
+    type = TCL_WIN_SOCKET;
+  else
+    switch (GetFileType(h)) {
+    case FILE_TYPE_CHAR:
+      type = TCL_WIN_CONSOLE;
+    case FILE_TYPE_PIPE:
+      type = TCL_WIN_PIPE;
+    case FILE_TYPE_DISK:
+    default:                    /* use WIN_FILE for unknown handles */
+      type = TCL_WIN_FILE;
+    }
+  return Tcl_GetFile(h, type);
+}
+
+#endif
+
+value camltk_add_file_input(fd, cbid)    /* ML */
+     value fd;
+     value cbid;
+{
+  CheckInit();
+  Tcl_CreateFileHandler(tcl_filehandle(fd), TCL_READABLE, 
+		       FileProc, (ClientData)(Long_val(cbid)));
+  return Val_unit;
+}
+
+/* We have to free the Tcl handle when we are finished using it (Tcl
+ * asks us to, and moreover it is probably dangerous to keep the same
+ * handle over two allocations of the same fd by the kernel). 
+ * But we don't know when we are finished with the fd, so we free it
+ * in rem_file (it doesn't close the fd anyway). For fds for which we
+ * repeatedly add/rem, this will cause some overhead.
+ */
+value camltk_rem_file_input(fd) /* ML */
+     value fd;
+{
+  Tcl_File fh = tcl_filehandle(fd);
+  Tcl_DeleteFileHandler(fh);
+  Tcl_FreeFile(fh);
+  return Val_unit;
+}
+
+value camltk_add_file_output(fd, cbid)    /* ML */
+     value fd;
+     value cbid;
+{
+  CheckInit();
+  Tcl_CreateFileHandler(tcl_filehandle(fd), TCL_WRITABLE, 
+		       FileProc, (ClientData) (Long_val(cbid)));
+  return Val_unit;
+}
+
+value camltk_rem_file_output(fd) /* ML */
+     value fd;
+{
+  Tcl_File fh = tcl_filehandle(fd);
+  Tcl_DeleteFileHandler(fh);
+  Tcl_FreeFile(fh);
+  return Val_unit;
+}
+