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Add TIOCM_OUT1, TIOCM_OUT2, and TIOCM_LOOP constants to termios #127335
Description
Feature or enhancement
Proposal:
This issue suggests adding new termios constants.
TIOCM_LOOP
TIOCM_OUT1
TIOCM_OUT2
example:
import array
import fcntl
import termios
f = open('/dev/ttyS0', 'r')
buf = array.array('h', [0])
# return a mask
fcntl.ioctl(f, termios.TIOCMGET, buf)
# some mask operation
# check if the target device has this flag activated
if buf[0] & TIOCM_OUT1: ...
if /* more compare */: ...
It's suitable for the physical characteristics of the terminal equipment, such as interrupt and chip select output
for example, a library like this uses.
https://github.com/makerbot/pyserial
ref:
https://github.com/torvalds/linux/blob/master/include/uapi/asm-generic/termios.h
Has this already been discussed elsewhere?
No response given
Links to previous discussion of this feature:
No response
Activity
[-]Add latest termios constants[/-][+]Add `TIOCM_OUT1`, `TIOCM_OUT2`, and `TIOCM_LOOP` constants to `termios`[/+]erlend-aasland commentedon Nov 29, 2024
Which constants? What do they do? Why are you proposing to add these flags? Always explain proposed changes in detail.
erlend-aasland commentedon Jan 4, 2025
You did not follow up this remark. Moreover, the example code in the OP is C code. Can you provide Python examples of how these are intended to be used?
rruuaanng commentedon Jan 5, 2025
I mistakenly thought I had modified it, but I hadn't :(. But now, I have changed it.