3 #define SERIAL_ERROR -1 /* General error, see errno for details */
4 #define SERIAL_TIMEOUT -2
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);