HP-UX Reference (11i v2 07/12) - 3 Library Functions A-M (vol 6)

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cfspeed(3C) cfspeed(3C)

NAME

cfgetospeed(), cfsetospeed(), cfgetispeed( ), cfsetispeed( ) - tty baud rate functions

SYNOPSIS

#include <termios.h>

speed_t cfgetospeed(const struct termios *termios_p);

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

speed_t cfgetispeed(const struct termios *termios_p);

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

DESCRIPTION

These functions set and get the input and output speed codes in the termios structure referenced by

termios_p. The termios structure contains these speed codes representing input and output baud rates as

well as other terminal related parameters. Setting the parameters on a terminal ﬁle does not become

effective until

tcsetattr() is successfully called.

cfgetospeed() returns the output speed code from the termios structure referenced by

termios_p.

cfsetospeed() sets the output speed code in the termios structure referenced by termios_p to

speed. The speed code for a baud rate of zero, B0, is used to terminate the con-

nection. If B0 is speciﬁed, the modem control lines are no longer asserted,

which normally disconnects the line.

cfgetispeed() returns the input speed code from the termios structure referenced by termios_p.

cfsetispeed() sets the input speed code in the termios structure referenced by termios_p to

speed.

RETURN VALUE

cfgetospeed() returns the output speed code from the termios structure referenced by termios_p.

cfgetispeed() returns the input speed code from the termios structure referenced by termios_p.

cfsetispeed() and cfsetospeed()

return zero upon successful completion. Otherwise, they

return -1 and set

errno to indicate the error.

ERRORS

cfsetispeed() and cfsetospeed()

fail when the following condition is encountered:

[EINVAL] The value of speed is outside the range of possible speed codes as speciﬁed in

<termios.h>.

WARNINGS

cfsetispeed() and cfsetospeed()

can be used to set speed codes in the termios structure that

are not supported by the terminal hardware.