NAME
cfsetospeed — set
output baud rate
SYNOPSIS
#include
<termios.h>
int cfsetospeed(struct termios *termios_p, speed_t speed);
DESCRIPTION
The cfsetospeed () function shall set the
output 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(3) 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(3) function is called.
RETURN VALUE
Upon successful completion, cfsetospeed ()
shall return 0; otherwise, it shall return -1 and errno
may be set to indicate the error.
ERRORS
The cfsetospeed () 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> .
EXAMPLES
None.
APPLICATION USAGE
None.
RATIONALE
Refer to cfgetispeed(3).
FUTURE DIRECTIONS
None.
SEE ALSO
cfgetispeed(3), cfgetospeed(3), cfsetispeed(3), tcsetattr(3), the Base Definitions volume of IEEE Std 1003.1-2001 (“POSIX.1”), xbd_chap11(7), <termios.h>
CHANGE HISTORY
First released in Issue 3. Included for alignment with the POSIX.1-1988 standard.
Issue 6
The following new requirements on POSIX implementations derive from alignment with the Single UNIX Specification:
- The optional setting of errno and the [EINVAL] error conditions are added.
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