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Diffstat (limited to 'Build/source/texk/dvisvgm/dvisvgm-1.1/src/SignalHandler.cpp')
-rw-r--r-- | Build/source/texk/dvisvgm/dvisvgm-1.1/src/SignalHandler.cpp | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.1/src/SignalHandler.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.1/src/SignalHandler.cpp new file mode 100644 index 00000000000..ffcd66165e0 --- /dev/null +++ b/Build/source/texk/dvisvgm/dvisvgm-1.1/src/SignalHandler.cpp @@ -0,0 +1,85 @@ +/************************************************************************* +** SignalHandler.cpp ** +** ** +** This file is part of dvisvgm -- the DVI to SVG converter ** +** Copyright (C) 2005-2013 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 <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; +} + |