Package: bash
Version: 4.3-11+b1
Severity: normal
Dear Maintainer,
the behavior of bash to handle signals of the built-in "read" command
has changed against bash V4.2.
The following tiny script shows the issue:
----------------- Script begin ------------------
#!/bin/bash
FIFO=myfifo
rm -f $FIFO
mkfifo $FIFO
myhandler()
{
echo "myhandler called"
trap - INT
kill -s INT $$
}
echo "Pid is $$"
trap myhandler INT
while [ "1" ]; do
read a b < $FIFO
echo "Read $a $b"
done
----------------- Script end ------------------
This script cannot be stopped by CTRL-C as long as "read" is blocking.
When I change the line
read a b < $FIFO
into
read a b
it works fine. Even if I kill the process externally via "kill -INT <pid>"
With bash 4.2.37 (part of Debian 7.8) this worked smoothly.
CTRL-C always stopped the execution of the script.
Is there any option I have to set or any workaround to make the bash script
behave as expected?
When I use "dash" instead of "bash" it is working fine.
However, as I want to use some extended bash features I'd like to stay
with bash...
Thanks for any feedback on this issue.
Regards
Mathias
-- System Information:
Debian Release: 8.1
APT prefers stable
APT policy: (500, 'stable')
Architecture: i386 (i686)
Kernel: Linux 3.18.13-rt10-2 (SMP w/8 CPU cores; PREEMPT)
Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
Versions of packages bash depends on:
ii base-files 8+deb8u1
ii dash 0.5.7-4+b1
ii debianutils 4.4+b1
ii libc6 2.19-18
ii libncurses5 5.9+20140913-1+b1
ii libtinfo5 5.9+20140913-1+b1
Versions of packages bash recommends:
ii bash-completion 1:2.1-4
Versions of packages bash suggests:
pn bash-doc <none>
-- no debconf information
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