ceph/src/boost/libs/asio/doc/overview/signals.qbk

   1 [/
   2  / Copyright (c) 2003-2016 Christopher M. Kohlhoff (chris at kohlhoff dot com)
   3  /
   4  / Distributed under the Boost Software License, Version 1.0. (See accompanying
   5  / file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6  /]
   7
   8 [section:signals Signal Handling]
   9
  10 Boost.Asio supports signal handling using a class called [link
  11 boost_asio.reference.signal_set signal_set]. Programs may add one or more signals to
  12 the set, and then perform an `async_wait()` operation. The specified handler
  13 will be called when one of the signals occurs. The same signal number may be
  14 registered with multiple [link boost_asio.reference.signal_set signal_set] objects,
  15 however the signal number must be used only with Boost.Asio.
  16
  17   void handler(
  18       const boost::system::error_code& error,
  19       int signal_number)
  20   {
  21     if (!error)
  22     {
  23       // A signal occurred.
  24     }
  25   }
  26
  27   ...
  28
  29   // Construct a signal set registered for process termination.
  30   boost::asio::signal_set signals(io_service, SIGINT, SIGTERM);
  31
  32   // Start an asynchronous wait for one of the signals to occur.
  33   signals.async_wait(handler);
  34
  35 Signal handling also works on Windows, as the Microsoft Visual C++ runtime
  36 library maps console events like Ctrl+C to the equivalent signal.
  37
  38 [heading See Also]
  39
  40 [link boost_asio.reference.signal_set signal_set],
  41 [link boost_asio.examples.cpp03_examples.http_server HTTP server example (C++03)],
  42 [link boost_asio.examples.cpp11_examples.http_server HTTP server example (C++11)].
  43
  44 [endsect]