cfsetispeed

Synopsis

#include <termios.h>

int cfsetispeed(struct termios *termios_p, speed_t speed);

Status

Implemented

Conformance

IEEE Std 1003.1-2017

Description

The cfsetispeed() function shall set the input baud rate stored in the structure pointed to by termios_p to speed.

There shall be no effect on the baud rates set in the hardware until a subsequent successful call to tcsetattr() with the same termios structure. Similarly, errors resulting from attempts to set baud rates not supported by the terminal device need not be detected until the tcsetattr() function is called.

If speed is 0 (B0), the input baud rate is set to the output baud rate stored in the structure, so that a subsequent call to tcsetattr() sets the input baud rate to the output baud rate. The value of speed is not validated: the speed constants defined in <termios.h> are equal to the baud rates they name (for example B9600 is 9600).

Return value

Upon successful completion, cfsetispeed() shall return 0; otherwise, -1 shall be returned, and errno may be set to indicate the error.

Errors

The cfsetispeed() function may fail if:

• EINVAL - The speed value is not a valid baud rate.

• EINVAL - The value of speed is outside the range of possible speed values as specified in <termios.h>.

POSIX deviations

No POSIX deviations discovered.