cc_t, speed_t, tcflag_t - terminal special characters, baud rates, modes
Standard C library (libc)
#include <termios.h>
typedef /* ... */ cc_t;
typedef /* ... */ speed_t;
typedef /* ... */ tcflag_t;
cc_t is used for terminal special characters, speed_t for baud rates, and tcflag_t for modes.
All are unsigned integer types.