整理

include/boost/process/v1/detail/posix/signal.hpp

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+// Copyright (c) 2006, 2007 Julio M. Merino Vidal
+// Copyright (c) 2008 Ilya Sokolov, Boris Schaeling
+// Copyright (c) 2009 Boris Schaeling
+// Copyright (c) 2010 Felipe Tanus, Boris Schaeling
+// Copyright (c) 2011, 2012 Jeff Flinn, Boris Schaeling
+// Copyright (c) 2016 Klemens D. Morgenstern
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_PROCESS_POSIX_SIGNAL_HPP
+#define BOOST_PROCESS_POSIX_SIGNAL_HPP
+
+#include <boost/process/v1/detail/posix/handler.hpp>
+#include <signal.h>
+
+namespace boost { namespace process { BOOST_PROCESS_V1_INLINE namespace v1 { namespace detail { namespace posix {
+
+#if defined(__GLIBC__)
+    using sighandler_t = ::sighandler_t;
+#else
+    using sighandler_t = void(*)(int);
+#endif
+
+
+struct sig_init_ : handler_base_ext
+{
+
+    sig_init_ (sighandler_t handler) : _handler(handler) {}
+
+    template <class PosixExecutor>
+    void on_exec_setup(PosixExecutor&)
+    {
+        _old = ::signal(SIGCHLD, _handler);
+    }
+
+    template <class Executor>
+    void on_error(Executor&, const std::error_code &)
+    {
+        if (!_reset)
+        {
+            ::signal(SIGCHLD, _old);
+            _reset = true;
+        }
+    }
+
+    template <class Executor>
+    void on_success(Executor&)
+    {
+        if (!_reset)
+        {
+            ::signal(SIGCHLD, _old);
+            _reset = true;
+        }
+    }
+private:
+    bool _reset = false;
+    ::boost::process::v1::detail::posix::sighandler_t _old{0};
+    ::boost::process::v1::detail::posix::sighandler_t _handler{0};
+};
+
+struct sig_
+{
+    constexpr sig_() {}
+
+    sig_init_ operator()(::boost::process::v1::detail::posix::sighandler_t h) const {return h;}
+    sig_init_ operator= (::boost::process::v1::detail::posix::sighandler_t h) const {return h;}
+    sig_init_ dfl() const {return SIG_DFL;}
+    sig_init_ ign() const {return SIG_IGN;}
+
+};
+
+
+
+
+
+}}}}}
+
+#endif