1 #include <termios.h> 2 3 #define SERIAL_ERROR -1 /* General error, see errno for details */ 4 #define SERIAL_TIMEOUT -2 5 #define SERIAL_EOF -3 6 7 extern speed_t cvtspeed(char *); 8 extern int serialopen(char *, speed_t); 9 extern int serialreadchar(int, int); 10 extern int serialwrite(int, char *, int); 11 extern int serialclose(int); 12