Description:
Running commands with boost::process::child or boost::process::system seem to cause file descriptor leaks.


Additional info:
boost 1.69.0-2
kernel 5.2.4-arch1-1-ARCH
gcc (GCC) 9.1.0

Steps to reproduce:

Compile and run the following, monitor /proc/PID/fd:

#include <boost/process.hpp>
#include <thread>
#include <cstdlib>


int main(void)
{
while(true)
{
std::this_thread::sleep_for(std::chrono::seconds(1));
std::system("/usr/bin/iptables -F");
}
return 0;
}