Question

I’m new to boost and I’ve been trying out boost::asio. The problem is I always get an “Bad File Descriptor” error/exception when setting some options (I need to make it non-blocking). Even this here fails:

#include <boost/asio.hpp>

using boost::asio::ip::tcp;

int main( )
{
  boost::asio::io_service io_service;

  tcp::socket socket( io_service );
  boost::asio::socket_base::non_blocking_io option(true);

  socket.io_control( option );

  return 0;
}

During run-time this pops up:

terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::system::system_error> >'
  what():  Bad file descriptor

Which is getting really frustrating as I’ve tried everything. OS is Linux x64 if it matters.

Answer 1

You invoked the socket constructor that does not open the socket. You could use one of the other overloads that open the socket prior to invoking socket::io_control(), or open the socket explicitly.

boost::asio::ip::tcp::socket socket(io_service);
socket.open(boost::asio::ip::tcp::v4());