boost::process reports ERROR_INVALID_HANDLE instead of ERROR_FILE_NOT_FOUND when program cannot be found

[jpo38 <jean.porcherot@…>]

Under Windows, the following program outputs "Error is 6" (6 means ERROR_INVALID_HANDLE), while it should report "Error is 2" (2 means ERROR_FILE_NOT_FOUND).

#include <boost/process.hpp>
#include <iostream>

int main( int argc, char* argv[] )
{
    
    try
    {
        boost::process::child p( "foo" );
        p.terminate();
    }
    catch ( boost::process::process_error err )
    {
        std::cout << "Error is " << err.code().value();
    }
    
    return 0;
}