Hello, I'm just wondering that bash (reproduced with 5.2-rc1 under Debian 11) seems to determine LINES and COLUMNS from stderr.
For example, this will lead to strange results when starting the script #!/bin/bash shopt -s checkwinsize trap 'echo $LINES $COLUMNS' SIGWINCH while true; do sleep 0.1; done with standard error redirected to a file (or - even more strange ;-) - another terminal). A quick POC shows that replacing tty = input_tty (); with tty = open( "/dev/tty", O_RDONLY ); in get_new_windows_size in lib/sh/winsize.c gives the "expected" result. In case there is some reason not to use /dev/tty, wouldn't it then be better to ask stdin instead of stderr? The script will most probably be interested in the size of device it is writing to, not the one it is logging to. Best regards Martin
