ceph/src/boost/boost/process/detail/posix/signal.hpp

   1 // Copyright (c) 2006, 2007 Julio M. Merino Vidal
   2 // Copyright (c) 2008 Ilya Sokolov, Boris Schaeling
   3 // Copyright (c) 2009 Boris Schaeling
   4 // Copyright (c) 2010 Felipe Tanus, Boris Schaeling
   5 // Copyright (c) 2011, 2012 Jeff Flinn, Boris Schaeling
   6 // Copyright (c) 2016 Klemens D. Morgenstern
   7 //
   8 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   9 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  10
  11 #ifndef BOOST_PROCESS_POSIX_SIGNAL_HPP
  12 #define BOOST_PROCESS_POSIX_SIGNAL_HPP
  13
  14 #include <boost/process/detail/posix/handler.hpp>
  15 #include <signal.h>
  16
  17 namespace boost { namespace process { namespace detail { namespace posix {
  18
  19 #if defined(__GLIBC__)
  20     using sighandler_t = ::sighandler_t;
  21 #else
  22     using sighandler_t = void(*)(int);
  23 #endif
  24
  25
  26 struct sig_init_ : handler_base_ext
  27 {
  28
  29     sig_init_ (sighandler_t handler) : _handler(handler) {}
  30
  31     template <class PosixExecutor>
  32     void on_exec_setup(PosixExecutor&)
  33     {
  34         _old = ::signal(SIGCHLD, _handler);
  35     }
  36
  37     template <class Executor>
  38     void on_error(Executor&, const std::error_code &)
  39     {
  40         if (!_reset)
  41         {
  42             ::signal(SIGCHLD, _old);
  43             _reset = true;
  44         }
  45     }
  46
  47     template <class Executor>
  48     void on_success(Executor&)
  49     {
  50         if (!_reset)
  51         {
  52             ::signal(SIGCHLD, _old);
  53             _reset = true;
  54         }
  55     }
  56 private:
  57     bool _reset = false;
  58     ::boost::process::detail::posix::sighandler_t _old{0};
  59     ::boost::process::detail::posix::sighandler_t _handler{0};
  60 };
  61
  62 struct sig_
  63 {
  64     constexpr sig_() {}
  65
  66     sig_init_ operator()(::boost::process::detail::posix::sighandler_t h) const {return h;}
  67     sig_init_ operator= (::boost::process::detail::posix::sighandler_t h) const {return h;}
  68     sig_init_ dfl() const {return SIG_DFL;}
  69     sig_init_ ign() const {return SIG_IGN;}
  70
  71 };
  72
  73
  74
  75
  76
  77 }}}}
  78
  79 #endif