mono_runtime_install_chained_signal_handler.patch

mono_runtime_install_chained_signal_handler.patch

commit fe39d32800002f60624bcf6b48f6ba17b967c7ac
Author: Rolf Bjarne Kvinge <rolf@xamarin.com>
Date:   Tue Sep 13 13:19:25 2016 +0200

    [mini] Add API to change/install the saved signal handler for a signal.

diff --git a/mono/mini/mini-posix.c b/mono/mini/mini-posix.c
index e192403..770a33c 100644
--- a/mono/mini/mini-posix.c
+++ b/mono/mini/mini-posix.c
@@ -181,6 +181,30 @@ free_saved_signal_handlers (void)
 }
 
 /*
+ * mono_runtime_install_chained_signal_handler:
+ *
+ * Installs a signal handler that will be called when mono
+ * handles a signal and determines the signal occurred in
+ * code that mono does not care about.
+ *
+ */
+void
+mono_runtime_install_chained_signal_handler (int signal, const struct sigaction *handler, struct sigaction *previous_handler)
+{
+	gpointer original_value;
+
+	if (!mono_saved_signal_handlers)
+		mono_saved_signal_handlers = g_hash_table_new_full (NULL, NULL, NULL, g_free);
+
+	if (previous_handler && g_hash_table_lookup_extended (mono_saved_signal_handlers, GINT_TO_POINTER (signal), NULL, &original_value))
+		*previous_handler = *(struct sigaction *) original_value;
+
+	struct sigaction *handler_to_save = (struct sigaction *) g_malloc (sizeof (struct sigaction));
+	*handler_to_save = *handler;
+	g_hash_table_replace (mono_saved_signal_handlers, GINT_TO_POINTER (signal), handler_to_save);
+}
+
+/*
  * mono_chain_signal:
  *
  *   Call the original signal handler for the signal given by the arguments, which
diff --git a/mono/mini/mini.h b/mono/mini/mini.h
index 845162f..c6fc1ea 100644
--- a/mono/mini/mini.h
+++ b/mono/mini/mini.h
@@ -3153,6 +3153,7 @@ void mono_runtime_cleanup_handlers (void);
 void mono_runtime_setup_stat_profiler (void);
 void mono_runtime_shutdown_stat_profiler (void);
 void mono_runtime_posix_install_handlers (void);
+void mono_runtime_install_chained_signal_handler (int signal, const struct sigaction *handler, struct sigaction *previous_handler);
 pid_t mono_runtime_syscall_fork (void);
 void mono_gdb_render_native_backtraces (pid_t crashed_pid);