#if defined(__linux__)

#include <sys/ioctl.h>
#include <asm/ioctls.h>
#include <asm/termbits.h>
#include <linux/serial.h>

// Uses the termios2 interface to set nonstandard baud rates
int linuxSetCustomBaudRate(const int fd, const unsigned int baudrate) {
    struct termios2 t;

    if (ioctl(fd, TCGETS2, &t) == -1) {
      return -1;
    }

    t.c_cflag &= ~CBAUD;
    t.c_cflag |= BOTHER;
    t.c_ospeed = t.c_ispeed = baudrate;

    if (ioctl(fd, TCSETS2, &t) == -1) {
      return -2;
    }

    return 0;
}

// Uses termios2 interface to retrieve system reported baud rate
int linuxGetSystemBaudRate(const int fd, int* const outbaud) {
  struct termios2 t;

  if (ioctl(fd, TCGETS2, &t) == -1) {
    return -1;
  }

  *outbaud = static_cast<int>(t.c_ospeed);

  return 0;
}

int linuxSetLowLatencyMode(const int fd, const bool enable) {
  struct serial_struct ss;

  if (ioctl(fd, TIOCGSERIAL, &ss) == -1) {
    return -1;
  }

  if ((ss.flags & ASYNC_LOW_LATENCY) == enable) {
    return 0;
  }

  if (enable) {
    ss.flags |= ASYNC_LOW_LATENCY;
  } else {
    ss.flags &= ~ASYNC_LOW_LATENCY;
  }

  if (ioctl(fd, TIOCSSERIAL, &ss) == -1) {
    return -2;
  }

  return 0;
}

int linuxGetLowLatencyMode(const int fd, bool* const enabled) {
  struct serial_struct ss;

  if (ioctl(fd, TIOCGSERIAL, &ss) == -1) {
    return -1;
  }

  *enabled = ss.flags & ASYNC_LOW_LATENCY;

  return 0;
}

#endif