Imported existing code

libraries/include/boost/asio/detail/socket_select_interrupter.hpp

@@ -0,0 +1,189 @@
+//
+// socket_select_interrupter.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2008 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// 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_ASIO_DETAIL_SOCKET_SELECT_INTERRUPTER_HPP
+#define BOOST_ASIO_DETAIL_SOCKET_SELECT_INTERRUPTER_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include <boost/asio/detail/push_options.hpp>
+
+#include <boost/asio/detail/push_options.hpp>
+#include <cstdlib>
+#include <boost/throw_exception.hpp>
+#include <boost/system/system_error.hpp>
+#include <boost/asio/detail/pop_options.hpp>
+
+#include <boost/asio/error.hpp>
+#include <boost/asio/detail/socket_holder.hpp>
+#include <boost/asio/detail/socket_ops.hpp>
+#include <boost/asio/detail/socket_types.hpp>
+
+namespace boost {
+namespace asio {
+namespace detail {
+
+class socket_select_interrupter
+{
+public:
+  // Constructor.
+  socket_select_interrupter()
+  {
+    boost::system::error_code ec;
+    socket_holder acceptor(socket_ops::socket(
+          AF_INET, SOCK_STREAM, IPPROTO_TCP, ec));
+    if (acceptor.get() == invalid_socket)
+    {
+      boost::system::system_error e(ec, "socket_select_interrupter");
+      boost::throw_exception(e);
+    }
+
+    int opt = 1;
+    socket_ops::setsockopt(acceptor.get(),
+        SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt), ec);
+
+    using namespace std; // For memset.
+    sockaddr_in4_type addr;
+    std::size_t addr_len = sizeof(addr);
+    memset(&addr, 0, sizeof(addr));
+    addr.sin_family = AF_INET;
+    addr.sin_addr.s_addr = inet_addr("127.0.0.1");
+    addr.sin_port = 0;
+    if (socket_ops::bind(acceptor.get(), (const socket_addr_type*)&addr,
+          addr_len, ec) == socket_error_retval)
+    {
+      boost::system::system_error e(ec, "socket_select_interrupter");
+      boost::throw_exception(e);
+    }
+
+    if (socket_ops::getsockname(acceptor.get(), (socket_addr_type*)&addr,
+          &addr_len, ec) == socket_error_retval)
+    {
+      boost::system::system_error e(ec, "socket_select_interrupter");
+      boost::throw_exception(e);
+    }
+
+    if (socket_ops::listen(acceptor.get(),
+          SOMAXCONN, ec) == socket_error_retval)
+    {
+      boost::system::system_error e(ec, "socket_select_interrupter");
+      boost::throw_exception(e);
+    }
+
+    socket_holder client(socket_ops::socket(
+          AF_INET, SOCK_STREAM, IPPROTO_TCP, ec));
+    if (client.get() == invalid_socket)
+    {
+      boost::system::system_error e(ec, "socket_select_interrupter");
+      boost::throw_exception(e);
+    }
+
+    if (socket_ops::connect(client.get(), (const socket_addr_type*)&addr,
+          addr_len, ec) == socket_error_retval)
+    {
+      boost::system::system_error e(ec, "socket_select_interrupter");
+      boost::throw_exception(e);
+    }
+
+    socket_holder server(socket_ops::accept(acceptor.get(), 0, 0, ec));
+    if (server.get() == invalid_socket)
+    {
+      boost::system::system_error e(ec, "socket_select_interrupter");
+      boost::throw_exception(e);
+    }
+    
+    ioctl_arg_type non_blocking = 1;
+    if (socket_ops::ioctl(client.get(), FIONBIO, &non_blocking, ec))
+    {
+      boost::system::system_error e(ec, "socket_select_interrupter");
+      boost::throw_exception(e);
+    }
+
+    opt = 1;
+    socket_ops::setsockopt(client.get(),
+        IPPROTO_TCP, TCP_NODELAY, &opt, sizeof(opt), ec);
+
+    non_blocking = 1;
+    if (socket_ops::ioctl(server.get(), FIONBIO, &non_blocking, ec))
+    {
+      boost::system::system_error e(ec, "socket_select_interrupter");
+      boost::throw_exception(e);
+    }
+
+    opt = 1;
+    socket_ops::setsockopt(server.get(),
+        IPPROTO_TCP, TCP_NODELAY, &opt, sizeof(opt), ec);
+
+    read_descriptor_ = server.release();
+    write_descriptor_ = client.release();
+  }
+
+  // Destructor.
+  ~socket_select_interrupter()
+  {
+    boost::system::error_code ec;
+    if (read_descriptor_ != invalid_socket)
+      socket_ops::close(read_descriptor_, ec);
+    if (write_descriptor_ != invalid_socket)
+      socket_ops::close(write_descriptor_, ec);
+  }
+
+  // Interrupt the select call.
+  void interrupt()
+  {
+    char byte = 0;
+    socket_ops::buf b;
+    socket_ops::init_buf(b, &byte, 1);
+    boost::system::error_code ec;
+    socket_ops::send(write_descriptor_, &b, 1, 0, ec);
+  }
+
+  // Reset the select interrupt. Returns true if the call was interrupted.
+  bool reset()
+  {
+    char data[1024];
+    socket_ops::buf b;
+    socket_ops::init_buf(b, data, sizeof(data));
+    boost::system::error_code ec;
+    int bytes_read = socket_ops::recv(read_descriptor_, &b, 1, 0, ec);
+    bool was_interrupted = (bytes_read > 0);
+    while (bytes_read == sizeof(data))
+      bytes_read = socket_ops::recv(read_descriptor_, &b, 1, 0, ec);
+    return was_interrupted;
+  }
+
+  // Get the read descriptor to be passed to select.
+  socket_type read_descriptor() const
+  {
+    return read_descriptor_;
+  }
+
+private:
+  // The read end of a connection used to interrupt the select call. This file
+  // descriptor is passed to select such that when it is time to stop, a single
+  // byte will be written on the other end of the connection and this
+  // descriptor will become readable.
+  socket_type read_descriptor_;
+
+  // The write end of a connection used to interrupt the select call. A single
+  // byte may be written to this to wake up the select which is waiting for the
+  // other end to become readable.
+  socket_type write_descriptor_;
+};
+
+} // namespace detail
+} // namespace asio
+} // namespace boost
+
+#include <boost/asio/detail/pop_options.hpp>
+
+#endif // BOOST_ASIO_DETAIL_SOCKET_SELECT_INTERRUPTER_HPP