Including and in the same project

Question

What I want to achieve: I want to set custom baud rate values for some tty*-like UART-mapped terminals.

How: The only way I fo

Answer 1

I had a similar issue - wanted custom baud rate support with definitions like termios2, TCGETS2 and BOTHER, while still making use of the traditional termios calls. I instinctively wrapped the termios2 stuff in its own compilation unit and had no problems. So my structure looks like this:

serial_driver.c/.h

#include <termios.h>
#include <fcntl.h>
#include <dirent.h>

int open_port(int fd, int baudrate, eParitySetting parity, int numStopBits)
{
  if(baudrate_is_non_standard(baudrate)
    setNonStandardBaudRateTermios(fd, baudrate, parity, numStopBits);
  else
    //all the normal tcgetattr/cfsetospeed/tcsetattr
}

int do_other_things(void)
{
  //all the normal tcsendbreak/tcflush/etc things
}

serial_driver_abr.c/.h

#include <asm/termios.h> /* asm gives us the all important BOTHER and TCGETS2 */
#include <fcntl.h>
#include <dirent.h>
#include <stropts.h> /* Oddly, for ioctl, because ioctl.h causes include dramas */

setNonStandardBaudRateTermios(int fd, int baudrate, eParitySetting parity, int numStopBits)
{
  //All the termios2/ioctl/TCGETS2/BOTHER things
}

Works well for me.

Answer 2

How can I solve this without using some obscure practice (like wrapping one of headers in a namespace, like mentioned here)?

If you find namespaces obscure, I don't know how you'd call this:

#define termios asmtermios
#include <asm/termios.h>
#undef  termios
#include <termios.h>

Anyway, this too gets you rid of the error: redefinition of 'struct termios'.