Hi,
Is it possible to write both the stdout and stderr stream to the same output file/stream ?
I am hoping to emulate
```
bp_stdout_stderr_app > output.txt 2>&1
```
I tried doing something like that but get a runtime error
Run output
```
terminate called after throwing an instance of 'boost::process::process_error'
what(): dup3() failed: Bad file descriptor
stdout : 000
stdout : 020
stdout : 040
Aborted (core dumped)
```
Source code
```
#include <boost/process.hpp>
#include <iostream>
using namespace boost::process;
int main()
{
ipstream pipe_stream;
child c("bp_stdout_stderr_app", std_out > pipe_stream, std_err > pipe_stream);
std::string line;
while (pipe_stream && std::getline(pipe_stream, line) && !line.empty())
std::cerr << line << std::endl;
c.wait();
}
```