Inherited from posix::basic_descriptor.

Perform an IO control command on the descriptor.

template<
    typename IoControlCommand>
void io_control(
    IoControlCommand & command,
    asio::error_code & ec);

This function is used to execute an IO control command on the descriptor.

Parameters

Example

Getting the number of bytes ready to read:

asio::posix::stream_descriptor descriptor(my_context);
...
asio::posix::stream_descriptor::bytes_readable command;
asio::error_code ec;
descriptor.io_control(command, ec);
if (ec)
{
  // An error occurred.
}
std::size_t bytes_readable = command.get();