Cfsetospeed and cfsetispeed functions in Linux-supplement to serial programming in Linux

The cfsetospeed and cfsetispeed functions are usually used to set the baud rate. The cfgetispeed and cfgetospeed functions are used to obtain the baud rate information.

Cfsetospeed Function

Header file:

# Include <termios. h>

Function prototype:

Int cfsetospeed (struct termios * termptr, speed_t speed );

Parameters:

Struct termios * termptr-pointer to the termios Structure

Speed_t speed-output baud rate to be set

Return Value:

If the request is successful, 0 is returned. Otherwise,-1 is returned.

Cfsetispeed Function

Header file:

# Include <termios. h>

Function prototype:

Int cfsetispeed (struct termios * termptr, speed_t speed );

Parameters:

Struct termios * termptr-pointer to the termios Structure

Speed_t speed-the input baud rate to be set

Return Value:

If the request is successful, 0 is returned. Otherwise,-1 is returned.

Cfgetospeed Function

Header file:

# Include <termios. h>

Function prototype:

Speed_t cfgetospeed (const struct termios * termptr );

Parameters:

Const struct termios-pointer to the termios Structure

Return Value:

Returns the output baud rate.

Cfgetispeed Function

Header file:

# Include <termios. h>

Function prototype:

Speed_t cfgetispeed (const struct termios * termptr );

Parameters:

Const struct termios * termptr-pointer to the termios Structure

Return Value:

Returns the input baud rate.

Baud Rate Constant:

Cbaud mask

B0 0 Port

B50 50 Port

B75 75 Port

B110 100 Port

B134 134 Port

B150 150 Port

B200 200 Port

B300 300 Port

B600 600 Port

B1200 1200 Port

B1800 1800 Port

B2400 2400 Port

B9600 9600 Port

B19200 19200 Port

B38400 38400 Port

B57600 57600 Port

B115200 115200 Port