Trap Command not detecting terminal resize (SIGWINCH)

Question

Im trying to detect when my menu is resized using trap "echo resized" SIGWINCH but it doesnt seem to be detecting it. Im currently using ubuntu 20.04 and i am using a bash script to do this. The trap command is at the top of my script. Why is it not executing?

try removing the `SIG` prefix as: `trap 'echo resized' WINCH`. Tested it working with `gnome-terminal` and `xterm`. — Léa Gris, Nov 07 '20 at 14:35

pynexj · Accepted Answer · 2020-11-07T14:49:02.487

3

According to bash manual (man bash):

If bash is waiting for a command to complete and receives a signal for which a trap has been set, the trap will not be executed until the command completes.

You can verify this with:

trap 'echo resized' SIGWINCH

while true; do
    sleep 1
done

edited Nov 07 '20 at 14:49

answered Nov 07 '20 at 14:37

pynexj

16,531
5
29
48

See: https://stackoverflow.com/questions/27694818/interrupt-sleep-in-bash-with-a-signal-trap – Léa Gris Nov 07 '20 at 14:44

Trap Command not detecting terminal resize (SIGWINCH)

1 Answers1