1 files changed, 86 insertions, 0 deletions
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.9.1/src/SignalHandler.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.9.1/src/SignalHandler.cpp
new file mode 100644
index 00000000000..3af78a66012
--- /dev/null
+++ b/Build/source/texk/dvisvgm/dvisvgm-1.9.1/src/SignalHandler.cpp
@@ -0,0 +1,86 @@
+/*************************************************************************
+** SignalHandler.cpp                                                    **
+**                                                                      **
+** This file is part of dvisvgm -- the DVI to SVG converter             **
+** Copyright (C) 2005-2015 Martin Gieseking <martin.gieseking@uos.de>   **
+**                                                                      **
+** This program is free software; you can redistribute it and/or        **
+** modify it under the terms of the GNU General Public License as       **
+** published by the Free Software Foundation; either version 3 of       **
+** the License, or (at your option) any later version.                  **
+**                                                                      **
+** This program is distributed in the hope that it will be useful, but  **
+** WITHOUT ANY WARRANTY; without even the implied warranty of           **
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the         **
+** GNU General Public License for more details.                         **
+**                                                                      **
+** You should have received a copy of the GNU General Public License    **
+** along with this program; if not, see <http://www.gnu.org/licenses/>. **
+*************************************************************************/
+
+#include <config.h>
+#include <cerrno>
+#include <csignal>
+#include <cstdlib>
+#include "SignalHandler.h"
+
+using namespace std;
+
+bool SignalHandler::_break = false;
+
+
+SignalHandler::~SignalHandler() {
+	stop();
+}
+
+
+/** Returns the singleton handler object. */
+SignalHandler& SignalHandler::instance() {
+	static SignalHandler handler;
+	return handler;
+}
+
+
+/** Starts listening to CTRL-C signals.
+ *  @return true if handler was activated. */
+bool SignalHandler::start () {
+	if (!_active) {
+		_break = false;
+		if (signal(SIGINT, SignalHandler::callback) != SIG_ERR) {
+			_active = true;
+			return true;
+		}
+	}
+	return false;
+}
+
+
+/** Stops listening for CTRL-C signals. */
+void SignalHandler::stop () {
+	if (_active) {
+		signal(SIGINT, SIG_DFL);
+		_active = false;
+	}
+}
+
+
+/** Checks for incoming signals and throws an exception if CTRL-C was caught.
+ *  @throw SignalException */
+void SignalHandler::check() {
+	if (_break)
+		throw SignalException();
+}
+
+
+void SignalHandler::trigger (bool notify) {
+	_break = true;
+	if (notify)
+		check();
+}
+
+
+/** This function is called on CTRL-C signals. */
+void SignalHandler::callback (int) {
+	_break = true;
+}
+