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Create child process with custom environment using boost

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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.

c++ boost boost-process

share|improve this question

edited Mar 9 at 3:48

xaxxon

14.7k43062

asked Mar 9 at 3:06

zack eveinzack evein

82

add a comment | 

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.

c++ boost boost-process

share|improve this question

edited Mar 9 at 3:48

xaxxon

14.7k43062

asked Mar 9 at 3:06

zack eveinzack evein

82

add a comment | 

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

edited Mar 9 at 3:48

xaxxon

14.7k43062

asked Mar 9 at 3:06

zack eveinzack evein

82

share|improve this question

edited Mar 9 at 3:48

xaxxon

14.7k43062

asked Mar 9 at 3:06

zack eveinzack evein

82

share|improve this question

edited Mar 9 at 3:48

xaxxon

14.7k43062

asked Mar 9 at 3:06

zack eveinzack evein

82

edited Mar 9 at 3:48

xaxxon

14.7k43062

edited Mar 9 at 3:48

xaxxon

14.7k43062

asked Mar 9 at 3:06

zack eveinzack evein

82

asked Mar 9 at 3:06

zack eveinzack evein

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

answered Mar 9 at 3:30

xaxxonxaxxon

14.7k43062

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  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
  

  
  
  
  

add a comment | 

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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

answered Mar 9 at 3:30

xaxxonxaxxon

14.7k43062

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  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
  

  
  
  
  

add a comment | 

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

answered Mar 9 at 3:30

xaxxonxaxxon

14.7k43062

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  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
  

  
  
  
  

add a comment | 

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

answered Mar 9 at 3:30

xaxxonxaxxon

14.7k43062

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();

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

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)...);

share|improve this answer

answered Mar 9 at 3:30

xaxxonxaxxon

14.7k43062

answered Mar 9 at 3:30

xaxxonxaxxon

14.7k43062

answered Mar 9 at 3:30

xaxxonxaxxon

14.7k43062