cfsetspeed -- set terminal input and output data rate


#include <termios.h>

int cfsetspeed(struct termios *t, speed_t speed);


cfsetspeed() sets the baud rate values in the termios structure. The effects of the function on the terminal as described below do not become effective, nor are all errors detected, until the tcsetattr() function is called. Certain values for baud rates set in termios and passed to tcsetattr() have special meanings.

Getting and Setting the Baud Rate

Input and output baud rates are found in the termios structure. The unsigned integer speed_t is typdef'd in the include file termios.h. The value of the integer corresponds directly to the baud rate being represented; however, the following symbolic values are defined.

  #define B0      0
  #define B50     50
  #define B75     75
  #define B110    110
  #define B134    134
  #define B150    150
  #define B200    200
  #define B300    300
  #define B600    600
  #define B1200   1200
  #define B1800   1800
  #define B2400   2400
  #define B4800   4800
  #define B9600   9600
  #define B19200  19200
  #define B38400  38400
  #ifndef _POSIX_SOURCE
  #define EXTA    19200
  #define EXTB    38400
  #endif  /*_POSIX_SOURCE */

cfsetspeed() sets both the input and output baud rates in the termios structure referenced by t to speed.

Return Value

On success, 0 is returned. On error, -1 is returned and the global variable errno is set appropriately.



Invalid speed argument