Output by dash 0.5.10.2-6:
3
^CIgnored 1
Ignored 2
Back
EXIT
bash 5.0.3 works the same way.
To get the output you want, you can use the following code:
--------------
#!/bin/sh
#set -e
trap '' INT
trap 'echo EXIT' EXIT
sorry() {
echo "Ignored 1"; echo "Ignored 2"
sleep 1
echo Back
}
for i in 3 2 1; do
echo "$i"
(
trap 'sorry; exit 0' INT
sleep 1
) # || :
done
echo OUT
---------
If you use bash, instead of dash, it would work even if "set -e" was
used and "trap '' INT" was not used. If "set -e" was used with dash, you
would have to uncomment "|| :" to make it work.
See also Bug #892317
--
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Foundations Bugs, which is subscribed to dash in Ubuntu.
https://bugs.launchpad.net/bugs/673119
Title:
dash "set -e" breaks "trap action INT"
Status in dash package in Ubuntu:
New
Bug description:
Binary package hint: dash
With set -e, dash executes only the first command of an INT (Ctrl-C)
trap handler:
#!/bin/sh
set -e
trap 'sorry' INT
trap 'echo EXIT' EXIT
zero() {
return 0;
}
sorry() {
#zero
echo "Ignored 1"; echo "Ignored 2"
sleep 1
echo Back
}
for i in 3 2 1; do
echo "$i"
sleep 1 # || true
done
echo OUT
Actual result:
$ ./x # Press ^C right away
3
^CIgnored 1
EXIT
Expected result:
3
^CIgnored 1
Ignored 2
Back
2
1
OUT
EXIT
By un-commenting the call to function zero, or the "|| true" in the
main loop, the problem disapears.
Bash also exits prematurely, but at least it runs the "trap INT"
handler code to completion.
ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: dash 0.5.5.1-3ubuntu2
ProcVersionSignature: Ubuntu 2.6.32-25.45-generic 2.6.32.21+drm33.7
Uname: Linux 2.6.32-25-generic i686
NonfreeKernelModules: nvidia
Architecture: i386
Date: Tue Nov 9 19:12:41 2010
ProcEnviron:
PATH=(custom, user)
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: dash
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