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3rdparty/boost_1_81_0/boost/process/spawn.hpp 1.88 KB
0b6a182c   Hu Chunming   添加无鉴权注册和注销
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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)
  
  /**
   * \file boost/process/spawn.hpp
   *
   * Defines the spawn function.
   */
  
  #ifndef BOOST_PROCESS_SPAWN_HPP
  #define BOOST_PROCESS_SPAWN_HPP
  
  #include <boost/process/detail/config.hpp>
  #include <boost/process/detail/child_decl.hpp>
  #include <boost/process/detail/execute_impl.hpp>
  #include <boost/process/detail/async_handler.hpp>
  
  #if defined(BOOST_POSIX_API)
  #include <boost/process/posix.hpp>
  #endif
  
  namespace boost {
  
  namespace process {
  
  namespace detail {
  
  }
  
  /** Launch a process and detach it. Returns no handle.
  
  This function starts a process and immediately detaches it. It thereby prevents the system from creating a zombie process,
  but will also cause the system to be unable to wait for the child to exit.
  
  \note This will set `SIGCHLD` to `SIGIGN` on posix.
  
  \warning This function does not allow asynchronous operations, since it cannot wait for the end of the process.
  It will fail to compile if a reference to `boost::asio::io_context` is passed.
  
   */
  template<typename ...Args>
  inline void spawn(Args && ...args)
  {
      typedef typename ::boost::process::detail::has_async_handler<Args...>::type
              has_async;
  
  
      static_assert(
              !has_async::value,
              "Spawn cannot wait for exit, so async properties cannot be used");
  
      auto c = ::boost::process::detail::execute_impl(
  #if defined(BOOST_POSIX_API)
              ::boost::process::posix::sig.ign(),
  #endif
               std::forward<Args>(args)...);
      c.detach();
  }
  
  }}
  #endif