* tui/tui-interp.c (tui_is_toplevel): New.

	(tui_init): Set it.
	(tui_allowed_p): New.
	* tui/tui.c (tui_enable): Check if the TUI is allowed before
	enabling it.
	* tui/tui.h (tui_allowed_p): Declare.

1 files changed, 17 insertions, 0 deletions

diff --git a/gdb/tui/tui-interp.c b/gdb/tui/tui-interp.c
index 3bb8246..2a6c3ce 100644
--- a/gdb/tui/tui-interp.c
+++ b/gdb/tui/tui-interp.c
@@ -45,11 +45,16 @@ tui_exit (void)
   tui_disable ();
 }
 
+/* True if TUI is the top-level interpreter.  */
+static int tui_is_toplevel = 0;
+
 /* These implement the TUI interpreter.  */
 
 static void *
 tui_init (int top_level)
 {
+  tui_is_toplevel = top_level;
+
   /* Install exit handler to leave the screen in a good shape.  */
   atexit (tui_exit);
 
@@ -63,6 +68,18 @@ tui_init (int top_level)
   return NULL;
 }
 
+/* True if enabling the TUI is allowed.  Example, if the top level
+   interpreter is MI, enabling curses will certainly lose.  */
+
+int
+tui_allowed_p (void)
+{
+  /* Only if TUI is the top level interpreter.  Also don't try to
+     setup curses (and print funny control characters) if we're not
+     outputting to a terminal.  */
+  return tui_is_toplevel && ui_file_isatty (gdb_stdout);
+}
+
 static int
 tui_resume (void *data)
 {