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Create child process with custom environment using boost


Most used parts of BoostCreating JSON arrays in Boost using Property TreesWhat are the basic rules and idioms for operator overloading?How do I achieve the theoretical maximum of 4 FLOPs per cycle?Image Processing: Algorithm Improvement for 'Coca-Cola Can' RecognitionWhy is it faster to process a sorted array than an unsorted array?How to initialize boost::process::child(boost process 0.5)?Compiling an application for use in highly radioactive environmentsHow to reproduce deadlock hinted to by Boost process documentation?Read child process stdout in a separate thread with BOOST process






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1















The documentation boost doesn't provide any example for creating a child process with a custom environment using process::child(...).

An example is given with process::system(...) but the function system has less possible operations (such as pipes or waitpid) so I would like to have a full example using process::child if possible.










share|improve this question






























    1















    The documentation boost doesn't provide any example for creating a child process with a custom environment using process::child(...).

    An example is given with process::system(...) but the function system has less possible operations (such as pipes or waitpid) so I would like to have a full example using process::child if possible.










    share|improve this question


























      1












      1








      1








      The documentation boost doesn't provide any example for creating a child process with a custom environment using process::child(...).

      An example is given with process::system(...) but the function system has less possible operations (such as pipes or waitpid) so I would like to have a full example using process::child if possible.










      share|improve this question
















      The documentation boost doesn't provide any example for creating a child process with a custom environment using process::child(...).

      An example is given with process::system(...) but the function system has less possible operations (such as pipes or waitpid) so I would like to have a full example using process::child if possible.







      c++ boost boost-process






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Mar 9 at 3:48









      xaxxon

      14.6k43062




      14.6k43062










      asked Mar 9 at 3:06









      zack eveinzack evein

      82




      82






















          1 Answer
          1






          active

          oldest

          votes


















          0














          in system.hpp, system_impl, which supports custom env, is implemented in terms of child,



          template<typename IoService, typename ...Args>
          inline int system_impl(
          std::true_type, /*needs ios*/
          std::true_type, /*has io_context*/
          Args && ...args)
          !check.succeeded)
          return -1;

          while (!exited.load())
          ios.poll();

          return c.exit_code();



          So the call to system from the docs:



          bp::system("stuff", bp::env["VALUE_1"]="foo", bp::env["VALUE_2"]+="bar1", "bar2");


          which calls:



          template<typename ...Args>
          inline int system(Args && ...args)

          typedef typename ::boost::process::detail::needs_io_context<Args...>::type
          need_ios;
          typedef typename ::boost::process::detail::has_io_context<Args...>::type
          has_ios;
          return ::boost::process::detail::system_impl<boost::asio::io_context>(
          need_ios(), has_ios(),
          std::forward<Args>(args)...);



          translates into this function, so you should be able to do the same.






          share|improve this answer























          • it seems weird that nothing is already created

            – zack evein
            Mar 9 at 15:13











          • apparently args are sent to child but it does not compile with child

            – zack evein
            Mar 9 at 15:28











          • I did it wrong, thanks it works

            – zack evein
            Mar 10 at 0:33











          Your Answer






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          1 Answer
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          active

          oldest

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          active

          oldest

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          0














          in system.hpp, system_impl, which supports custom env, is implemented in terms of child,



          template<typename IoService, typename ...Args>
          inline int system_impl(
          std::true_type, /*needs ios*/
          std::true_type, /*has io_context*/
          Args && ...args)
          !check.succeeded)
          return -1;

          while (!exited.load())
          ios.poll();

          return c.exit_code();



          So the call to system from the docs:



          bp::system("stuff", bp::env["VALUE_1"]="foo", bp::env["VALUE_2"]+="bar1", "bar2");


          which calls:



          template<typename ...Args>
          inline int system(Args && ...args)

          typedef typename ::boost::process::detail::needs_io_context<Args...>::type
          need_ios;
          typedef typename ::boost::process::detail::has_io_context<Args...>::type
          has_ios;
          return ::boost::process::detail::system_impl<boost::asio::io_context>(
          need_ios(), has_ios(),
          std::forward<Args>(args)...);



          translates into this function, so you should be able to do the same.






          share|improve this answer























          • it seems weird that nothing is already created

            – zack evein
            Mar 9 at 15:13











          • apparently args are sent to child but it does not compile with child

            – zack evein
            Mar 9 at 15:28











          • I did it wrong, thanks it works

            – zack evein
            Mar 10 at 0:33















          0














          in system.hpp, system_impl, which supports custom env, is implemented in terms of child,



          template<typename IoService, typename ...Args>
          inline int system_impl(
          std::true_type, /*needs ios*/
          std::true_type, /*has io_context*/
          Args && ...args)
          !check.succeeded)
          return -1;

          while (!exited.load())
          ios.poll();

          return c.exit_code();



          So the call to system from the docs:



          bp::system("stuff", bp::env["VALUE_1"]="foo", bp::env["VALUE_2"]+="bar1", "bar2");


          which calls:



          template<typename ...Args>
          inline int system(Args && ...args)

          typedef typename ::boost::process::detail::needs_io_context<Args...>::type
          need_ios;
          typedef typename ::boost::process::detail::has_io_context<Args...>::type
          has_ios;
          return ::boost::process::detail::system_impl<boost::asio::io_context>(
          need_ios(), has_ios(),
          std::forward<Args>(args)...);



          translates into this function, so you should be able to do the same.






          share|improve this answer























          • it seems weird that nothing is already created

            – zack evein
            Mar 9 at 15:13











          • apparently args are sent to child but it does not compile with child

            – zack evein
            Mar 9 at 15:28











          • I did it wrong, thanks it works

            – zack evein
            Mar 10 at 0:33













          0












          0








          0







          in system.hpp, system_impl, which supports custom env, is implemented in terms of child,



          template<typename IoService, typename ...Args>
          inline int system_impl(
          std::true_type, /*needs ios*/
          std::true_type, /*has io_context*/
          Args && ...args)
          !check.succeeded)
          return -1;

          while (!exited.load())
          ios.poll();

          return c.exit_code();



          So the call to system from the docs:



          bp::system("stuff", bp::env["VALUE_1"]="foo", bp::env["VALUE_2"]+="bar1", "bar2");


          which calls:



          template<typename ...Args>
          inline int system(Args && ...args)

          typedef typename ::boost::process::detail::needs_io_context<Args...>::type
          need_ios;
          typedef typename ::boost::process::detail::has_io_context<Args...>::type
          has_ios;
          return ::boost::process::detail::system_impl<boost::asio::io_context>(
          need_ios(), has_ios(),
          std::forward<Args>(args)...);



          translates into this function, so you should be able to do the same.






          share|improve this answer













          in system.hpp, system_impl, which supports custom env, is implemented in terms of child,



          template<typename IoService, typename ...Args>
          inline int system_impl(
          std::true_type, /*needs ios*/
          std::true_type, /*has io_context*/
          Args && ...args)
          !check.succeeded)
          return -1;

          while (!exited.load())
          ios.poll();

          return c.exit_code();



          So the call to system from the docs:



          bp::system("stuff", bp::env["VALUE_1"]="foo", bp::env["VALUE_2"]+="bar1", "bar2");


          which calls:



          template<typename ...Args>
          inline int system(Args && ...args)

          typedef typename ::boost::process::detail::needs_io_context<Args...>::type
          need_ios;
          typedef typename ::boost::process::detail::has_io_context<Args...>::type
          has_ios;
          return ::boost::process::detail::system_impl<boost::asio::io_context>(
          need_ios(), has_ios(),
          std::forward<Args>(args)...);



          translates into this function, so you should be able to do the same.







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Mar 9 at 3:30









          xaxxonxaxxon

          14.6k43062




          14.6k43062












          • it seems weird that nothing is already created

            – zack evein
            Mar 9 at 15:13











          • apparently args are sent to child but it does not compile with child

            – zack evein
            Mar 9 at 15:28











          • I did it wrong, thanks it works

            – zack evein
            Mar 10 at 0:33

















          • it seems weird that nothing is already created

            – zack evein
            Mar 9 at 15:13











          • apparently args are sent to child but it does not compile with child

            – zack evein
            Mar 9 at 15:28











          • I did it wrong, thanks it works

            – zack evein
            Mar 10 at 0:33
















          it seems weird that nothing is already created

          – zack evein
          Mar 9 at 15:13





          it seems weird that nothing is already created

          – zack evein
          Mar 9 at 15:13













          apparently args are sent to child but it does not compile with child

          – zack evein
          Mar 9 at 15:28





          apparently args are sent to child but it does not compile with child

          – zack evein
          Mar 9 at 15:28













          I did it wrong, thanks it works

          – zack evein
          Mar 10 at 0:33





          I did it wrong, thanks it works

          – zack evein
          Mar 10 at 0:33



















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