[PATCH] Make sure terminal settings are restored before exiting

[Patrick Palka <patrick@parcs.ath.cx>]

[ Here is a new version of the patch that uses gdb_disable_readline
  instead of rl_deprep_terminal or gdb_rl_callback_handler_remove.

  A test is added to batch-preserve-term-settings.exp.  The test
  depends on the cleanup patch I posted earlier.  ]

Tested on x86_64 Stretch.

gdb/ChangeLog:

	* top.c (quit_force): Undo any modifications that may have been
	made to the terminal.

gdb/testsuite/ChangeLog:

	* gdb.base/batch-preserve-term-settings.exp
	(test_terminal_settings_preserved_after_cli_exit): New test.
---
 .../gdb.base/batch-preserve-term-settings.exp      | 94 +++++++++++++++++++++-
 gdb/top.c                                          |  9 +++
 2 files changed, 102 insertions(+), 1 deletion(-)

diff --git a/gdb/testsuite/gdb.base/batch-preserve-term-settings.exp b/gdb/testsuite/gdb.base/batch-preserve-term-settings.exp
index 97ffaa4..ca6f173 100644
--- a/gdb/testsuite/gdb.base/batch-preserve-term-settings.exp
+++ b/gdb/testsuite/gdb.base/batch-preserve-term-settings.exp
@@ -176,4 +176,96 @@ proc test_terminal_settings_preserved {} {
     exit_shell
 }
 
-test_terminal_settings_preserved
+# Check that quitting from the CLI via the "quit" command does not leave the
+# terminal in the wrong state.  The GDB commands CMDS are executed before
+# quitting.
+
+proc test_terminal_settings_preserved_after_cli_exit { cmds } {
+    global file_arg
+    global GDB INTERNAL_GDBFLAGS GDBFLAGS
+    global gdb_prompt
+    global shell_prompt_re
+
+    if ![spawn_shell] {
+	return
+    }
+
+    set saved_gdbflags $GDBFLAGS
+
+    set stty_supported [run_stty "stty before" stty_before]
+
+    set test "start gdb"
+    send_gdb "$GDB $INTERNAL_GDBFLAGS $GDBFLAGS [host_info gdb_opts] --args \"$file_arg\"\n"
+    gdb_expect {
+	-re "$gdb_prompt $" {
+	    pass $test
+	}
+	timeout {
+	    fail "$test (timeout)"
+	}
+	eof {
+	    fail "$test (eof)"
+	}
+    }
+
+    foreach cmd $cmds {
+	set test "run command $cmd"
+	send_gdb "$cmd\n"
+	gdb_expect {
+	    -re "$gdb_prompt $" {
+		pass $test
+	    }
+	    timeout {
+		fail "$test (timeout)"
+	    }
+	    eof {
+		fail "$test (eof)"
+	    }
+	}
+    }
+
+    set test "quit gdb"
+    send_gdb "quit\n"
+    gdb_expect {
+	-re "(y or n)" {
+	    send_gdb "y\n"
+	    exp_continue
+	}
+	-re ".*$shell_prompt_re$" {
+	    pass $test
+	}
+	timeout {
+	    fail "$test (timeout)"
+	}
+	eof {
+	    fail "$test (eof)"
+	}
+    }
+
+    set test "terminal settings preserved"
+    if $stty_supported {
+	run_stty "stty after" stty_after
+
+	gdb_assert [string equal $stty_before $stty_after] $test
+    } else {
+	unsupported "$test (no stty)"
+    }
+
+    exit_shell
+}
+
+with_test_prefix "batch run" {
+    test_terminal_settings_preserved
+}
+
+with_test_prefix "cli exit" {
+    test_terminal_settings_preserved_after_cli_exit { }
+}
+
+with_test_prefix "cli exit after start cmd" {
+    test_terminal_settings_preserved_after_cli_exit { "start" }
+}
+
+with_test_prefix "cli exit after run cmd" {
+    test_terminal_settings_preserved_after_cli_exit { "run" }
+}
diff --git a/gdb/top.c b/gdb/top.c
index 1e30b1c..6df987a 100644
--- a/gdb/top.c
+++ b/gdb/top.c
@@ -66,6 +66,7 @@
 #include "cli-out.h"
 #include "tracepoint.h"
 #include "inf-loop.h"
+#include "tui/tui.h"
 
 extern void initialize_all_files (void);
 
@@ -1494,6 +1495,14 @@ quit_force (char *args, int from_tty)
   int exit_code = 0;
   struct qt_args qt;
 
+  /* Make sure that the terminal is left in the state we acquired it.  */
+  target_terminal_ours ();
+#if defined(TUI)
+  tui_disable ();
+#endif
+  if (async_command_editing_p)
+    gdb_disable_readline ();
+
   /* An optional expression may be used to cause gdb to terminate with the 
      value of that expression.  */
   if (args)
-- 
2.5.0.rc2.22.g69b1679.dirty