tcattribute(3C)tcattribute(3C)NAMEtcgetattr(), tcsetattr() - control tty device
SYNOPSISDESCRIPTION
gets the parameters associated with fildes and stores them in the
termios structure referenced by termios_p. If the terminal device does
not support split baud rates, the input baud rate stored in the termios
structure is zero. This function is allowed from a background process
(see termio(7)). However, the terminal attributes can be subsequently
changed by a foreground process.
sets the parameters associated with fildes (unless support is required
from underlying hardware that is not available) from the termios struc‐
ture referenced by termios_p as follows:
· If optional_actions is the change is immediate.
· If optional_actions is the change occurs after all output
written to fildes is transmitted.
· If optional_actions is the change occurs after all output
written to fildes is transmitted, and all input that has been
received but not read is discarded.
RETURN VALUE
Upon successful completion, a value of zero is returned. Otherwise, a
value of −1 is returned and is set to indicate the error.
ERRORS
and fail if any of the following conditions are encountered:
[EBADF] fildes is not a valid file descriptor.
[EINVAL] The optional_actions argument is not a proper value or
no part of a request could be performed.
[ENOTTY] The file associated with fildes is not a terminal.
WARNINGS
will attempt to perform as much of the request as possible. However,
the hardware being used may not support all possible c_cflag values.
If any part of the request can be performed, those values will be set,
any values not supported by the hardware will be ignored, and will com‐
plete successfully. If no part of the request can be performed, will
fail and set to [EINVAL].
For any hardware that does not support separate input and output baud
rates, an attempt to set different input and output baud rates does not
affect either baud rate.
always returns the actual values set in hardware. For any hardware
that does not support separate input and output baud rates, returns
zero for the input baud rate.
SEE ALSOcfspeed(3C), tccontrol(3C), thread_safety(5), termio(7).
STANDARDS CONFORMANCEtcattribute(3C)