We may abort the process of detaching threads with multiple SIGINTs - which are

being sent during a testcase terminating its child GDB.

Some of the threads may not be properly PTRACE_DETACHed which hurts if they

should have been detached with SIGSTOP (as they are accidentally left running

on the debugger termination).

Index: gdb-7.9.50.20150520/gdb/defs.h

===================================================================

--- gdb-7.9.50.20150520.orig/gdb/defs.h	2015-05-31 18:06:24.579002757 +0200

+++ gdb-7.9.50.20150520/gdb/defs.h	2015-05-31 18:06:29.253031613 +0200

@@ -145,6 +145,7 @@ extern void set_quit_flag (void);

 /* Flag that function quit should call quit_force.  */

 extern volatile int sync_quit_force_run;

+extern int quit_flag_cleanup;

 extern int immediate_quit;

 extern void quit (void);

Index: gdb-7.9.50.20150520/gdb/top.c

===================================================================

--- gdb-7.9.50.20150520.orig/gdb/top.c	2015-05-31 18:06:24.580002763 +0200

+++ gdb-7.9.50.20150520/gdb/top.c	2015-05-31 18:06:29.254031619 +0200

@@ -1463,7 +1463,9 @@ quit_force (char *args, int from_tty)

   qt.args = args;

   qt.from_tty = from_tty;

-  /* We want to handle any quit errors and exit regardless.  */

+  /* We want to handle any quit errors and exit regardless but we should never

+     get user-interrupted to properly detach the inferior.  */

+  quit_flag_cleanup = 1;

   /* Get out of tfind mode, and kill or detach all inferiors.  */

   TRY

Index: gdb-7.9.50.20150520/gdb/utils.c

===================================================================

--- gdb-7.9.50.20150520.orig/gdb/utils.c	2015-05-31 18:06:24.582002776 +0200

+++ gdb-7.9.50.20150520/gdb/utils.c	2015-05-31 18:06:29.255031625 +0200

@@ -122,6 +122,11 @@ int job_control;

 int immediate_quit;

+/* Nonzero means we are already processing the quitting cleanups and we should

+   no longer get aborted.  */

+

+int quit_flag_cleanup;

+

 /* Nonzero means that strings with character values >0x7F should be printed

    as octal escapes.  Zero means just print the value (e.g. it's an

    international character, and the terminal or window can cope.)  */

Index: gdb-7.9.50.20150520/gdb/extension.c

===================================================================

--- gdb-7.9.50.20150520.orig/gdb/extension.c	2015-05-31 18:06:24.582002776 +0200

+++ gdb-7.9.50.20150520/gdb/extension.c	2015-05-31 18:06:29.256031632 +0200

@@ -833,6 +833,9 @@ check_quit_flag (void)

   int i, result = 0;

   const struct extension_language_defn *extlang;

+  if (quit_flag_cleanup)

+    return 0;

+

   ALL_ENABLED_EXTENSION_LANGUAGES (i, extlang)

     {

       if (extlang->ops->check_quit_flag != NULL)