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commands do not ignore TSTP if TSTP ignored already

From: idallen
Subject: commands do not ignore TSTP if TSTP ignored already
Date: Thu, 16 Oct 2014 00:38:23 -0400 (EDT)

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-pc-linux-gnu' 
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL 
-DHAVE_CONFIG_H   -I.  -I../bash -I../bash/include -I../bash/lib  
-D_FORTIFY_SOURCE=2 -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat 
-Wformat-security -Werror=format-security -Wall
uname output: Linux idallen-oak.home.idallen.ca 3.13.0-37-generic 
#64~precise1-Ubuntu SMP Wed Sep 24 21:37:11 UTC 2014 x86_64 x86_64 x86_64 
Machine Type: x86_64-pc-linux-gnu

Bash Version: 4.2
Patch Level: 25
Release Status: release


If a bash shell script starts up with TSTP ignored, commands run by that
script will not ignore TSTP, even if you set a trap in the script to
ignore TSTP.  If the script starts up with TSTP not ignored, then the
trap to ignore TSTP works fine.


Create these two scripts below one.sh and two.sh and run ./one.sh and use
^Z to signal TSTP.  The "sleep" will stop, even though TSTP is ignored.

Remove (comment out) the "trap" line from one.sh and run ./one.sh and
now ^Z (TSTP) is properly ignored when two.sh runs.

==> one.sh <==
    trap '' TSTP
    exec ./two.sh

==> two.sh <==
    trap '' TSTP
    while : ; do
        echo "DEBUG"
        sleep 1

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