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Cursor jumps to leftmost column on trap ... SIGALRM

From: Markus Schwarzenberg
Subject: Cursor jumps to leftmost column on trap ... SIGALRM
Date: Fri, 4 Feb 2022 15:54:14 +0100

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -O2 -flto=auto -ffat-lto-objects -fexceptions -g
-grecord-gcc-switches -pipe -Wall -Werror=format-security
-specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong
-specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -m64  -mtune=generic
-fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection
uname output: Linux ########.fraunhofer.de 5.15.12-200.fc35.x86_64
#1 SMP Wed Dec 29 15:03:38 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Machine Type: x86_64-redhat-linux-gnu

Bash Version: 5.1
Patch Level: 8
Release Status: release

        The position of the cursor changes to the first column when bash, 
        running inside xterm, receives the signal SIGALRM

        Expected behavior: No change in cursor position

        # Start a bash in xterm w/o customizations 
        xterm -class nothing -e bash --norc &
        # within this xterm, enter:
        function sigalarm_test { echo -n ; }  # define an empty signal handler
        trap sigalarm_test SIGALRM            # install the signal handler
        echo $$                               # report the shells PID
        # in a different shell, send SIGALRM to the PID of the previously 
started bash
        kill -s SIGALRM PID                   # use the PID reported by 'echo 
$$' above
        => now the cursor position jumps to the first column in the xterm 
running bash

        So far I've watched this behavior only with SIGALRM.

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