ceph/src/boost/boost/process/detail/child_decl.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 /**
  12  * \file boost/process/child.hpp
  13  *
  14  * Defines a child process class.
  15  */
  16
  17 #ifndef BOOST_PROCESS_CHILD_DECL_HPP
  18 #define BOOST_PROCESS_CHILD_DECL_HPP
  19
  20 #include <boost/process/detail/config.hpp>
  21 #include <chrono>
  22 #include <memory>
  23
  24 #include <boost/none.hpp>
  25 #include <atomic>
  26
  27 #if defined(BOOST_POSIX_API)
  28 #include <boost/process/detail/posix/child_handle.hpp>
  29 #include <boost/process/detail/posix/terminate.hpp>
  30 #include <boost/process/detail/posix/wait_for_exit.hpp>
  31 #include <boost/process/detail/posix/is_running.hpp>
  32 #elif defined(BOOST_WINDOWS_API)
  33 #include <boost/process/detail/windows/child_handle.hpp>
  34 #include <boost/process/detail/windows/terminate.hpp>
  35 #include <boost/process/detail/windows/wait_for_exit.hpp>
  36 #include <boost/process/detail/windows/is_running.hpp>
  37
  38 #endif
  39 namespace boost {
  40
  41 namespace process {
  42
  43 using ::boost::process::detail::api::pid_t;
  44
  45 class child
  46 {
  47     ::boost::process::detail::api::child_handle _child_handle;
  48     std::shared_ptr<std::atomic<int>> _exit_status = std::make_shared<std::atomic<int>>(::boost::process::detail::api::still_active);
  49     bool _attached = true;
  50     bool _terminated = false;
  51
  52     bool _exited()
  53     {
  54         return _terminated || !::boost::process::detail::api::is_running(_exit_status->load());
  55     };
  56 public:
  57     typedef ::boost::process::detail::api::child_handle child_handle;
  58     typedef child_handle::process_handle_t native_handle_t;
  59     explicit child(child_handle &&ch, std::shared_ptr<std::atomic<int>> &ptr) : _child_handle(std::move(ch)), _exit_status(ptr) {}
  60     explicit child(child_handle &&ch, const std::shared_ptr<std::atomic<int>> &ptr) : _child_handle(std::move(ch)), _exit_status(ptr) {}
  61     explicit child(child_handle &&ch) : _child_handle(std::move(ch)) {}
  62
  63     explicit child(pid_t & pid) : _child_handle(pid), _attached(false) {};
  64     child(const child&) = delete;
  65     child(child && lhs) noexcept
  66         : _child_handle(std::move(lhs._child_handle)),
  67           _exit_status(std::move(lhs._exit_status)),
  68           _attached (lhs._attached),
  69           _terminated (lhs._terminated)
  70     {
  71         lhs._attached = false;
  72     }
  73
  74     template<typename ...Args>
  75     explicit child(Args&&...args);
  76     child() { } // Must be kept non defaulted for MSVC 14.1 & 14.2 #113
  77     child& operator=(const child&) = delete;
  78     child& operator=(child && lhs)
  79     {
  80         _child_handle= std::move(lhs._child_handle);
  81         _exit_status = std::move(lhs._exit_status);
  82         _attached    = lhs._attached;
  83         _terminated  = lhs._terminated;
  84         lhs._attached = false;
  85         return *this;
  86     };
  87
  88     void detach() {_attached = false; }
  89     void join() {wait();}
  90     bool joinable() { return _attached;}
  91
  92     ~child()
  93     {
  94         std::error_code ec;
  95         if (_attached && !_exited() && running(ec))
  96             terminate(ec);
  97     }
  98     native_handle_t native_handle() const { return _child_handle.process_handle(); }
  99
 100
 101     int exit_code() const {return ::boost::process::detail::api::eval_exit_status(_exit_status->load());}
 102     pid_t id()      const {return _child_handle.id(); }
 103
 104     int native_exit_code() const {return _exit_status->load();}
 105
 106     bool running()
 107     {
 108         std::error_code ec;
 109         bool b = running(ec);
 110         boost::process::detail::throw_error(ec, "running error");
 111         return b;
 112     }
 113
 114     void terminate()
 115     {
 116         std::error_code ec;
 117         terminate(ec);
 118         boost::process::detail::throw_error(ec, "terminate error");
 119     }
 120
 121     void wait()
 122     {
 123         std::error_code ec;
 124         wait(ec);
 125         boost::process::detail::throw_error(ec, "wait error");
 126     }
 127
 128     template< class Rep, class Period >
 129     bool wait_for (const std::chrono::duration<Rep, Period>& rel_time)
 130     {
 131         std::error_code ec;
 132         bool b = wait_for(rel_time, ec);
 133         boost::process::detail::throw_error(ec, "wait_for error");
 134         return b;
 135     }
 136
 137     template< class Clock, class Duration >
 138     bool wait_until(const std::chrono::time_point<Clock, Duration>& timeout_time )
 139     {
 140         std::error_code ec;
 141         bool b = wait_until(timeout_time, ec);
 142         boost::process::detail::throw_error(ec, "wait_until error");
 143         return b;
 144     }
 145
 146     bool running(std::error_code & ec) noexcept
 147     {
 148         ec.clear();
 149         if (valid() && !_exited() && !ec)
 150         {
 151             int exit_code = 0;
 152             auto res = boost::process::detail::api::is_running(_child_handle, exit_code, ec);
 153             if (!ec && !res && !_exited())
 154                 _exit_status->store(exit_code);
 155
 156             return res;
 157         }
 158         return false;
 159     }
 160
 161     void terminate(std::error_code & ec) noexcept
 162     {
 163         if (valid() && running(ec) && !ec)
 164             boost::process::detail::api::terminate(_child_handle, ec);
 165
 166         if (!ec)
 167             _terminated = true;
 168     }
 169
 170     void wait(std::error_code & ec) noexcept
 171     {
 172         if (!_exited() && valid())
 173         {
 174             int exit_code = 0;
 175             boost::process::detail::api::wait(_child_handle, exit_code, ec);
 176             if (!ec)
 177                 _exit_status->store(exit_code);
 178         }
 179     }
 180
 181     template< class Rep, class Period >
 182     bool wait_for (const std::chrono::duration<Rep, Period>& rel_time, std::error_code & ec) noexcept
 183     {
 184         return wait_until(std::chrono::steady_clock::now() + rel_time, ec);
 185     }
 186
 187     template< class Clock, class Duration >
 188     bool wait_until(const std::chrono::time_point<Clock, Duration>& timeout_time, std::error_code & ec) noexcept
 189     {
 190         if (!_exited())
 191         {
 192             int exit_code = 0;
 193             auto b = boost::process::detail::api::wait_until(_child_handle, exit_code, timeout_time, ec);
 194             if (!b || ec)
 195                 return false;
 196             _exit_status->store(exit_code);
 197         }
 198         return true;
 199     }
 200
 201
 202     bool valid() const
 203     {
 204         return _child_handle.valid();
 205     }
 206     operator bool() const {return valid();}
 207
 208     bool in_group() const
 209     {
 210         return _child_handle.in_group();
 211     }
 212     bool in_group(std::error_code &ec) const noexcept
 213     {
 214         return _child_handle.in_group(ec);
 215     }
 216 };
 217
 218
 219
 220 }}
 221 #endif
 222