int cfsetospeed(struct termios *termios_p, speed_tspeed);
The cfsetospeed() function shall set the output baud rate stored
in the structure pointed to by termios_p to
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.
Upon successful completion, cfsetospeed() shall return 0; otherwise,
it shall return -1 and errno may be set to
indicate the error.
The cfsetospeed() function may fail if:
The speed value is not a valid baud rate.
The value of speed is outside the range of possible speed values
as specified in <termios.h>.
The following sections are informative.
Refer to cfgetispeed() .
cfgetispeed() , cfgetospeed() , cfsetispeed() ,
tcsetattr() , the Base Definitions volume of
IEEE Std 1003.1-2001, Chapter 11, General Terminal Interface, <termios.h>
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group. In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online at