Configuration Information [Automatically generated, do not change]:
Machine: i686
OS: linux-gnu
Compiler: i686-pc-linux-gnu-gcc
Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='i686' -
DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i686-pc-linux-gnu' -
DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL -
DHAVE_CONFIG_H -I. -I. -I./include -I./lib -
DDEFAULT_PATH_VALUE='/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin'
-DSTANDARD_UTILS_PATH='/bin:/usr/bin:/sbin:/usr/sbin' -
DSYS_BASHRC='/etc/bash/bashrc' -DSYS_BASH_LOGOUT='/etc/bash/bash_logout' -
DNON_INTERACTIVE_LOGIN_SHELLS -DSSH_SOURCE_BASHRC -march=pentium4 -g -O2 -pipe
uname output: Linux localhost 2.6.31.6-grsec #1 Fri Nov 13 21:21:04 CET 2009
i686 Intel(R) Pentium(R) 4 CPU 2.80GHz GenuineIntel GNU/Linux
Machine Type: i686-pc-linux-gnu
Bash Version: 4.0
Patch Level: 33
Release Status: release
Description:
The bash builtin function "caller" outputs wrong line numbers if the
script was sourced within the current shell. This may have to do with
subshells, but the output is correct if a newly spawned shell
runs the script. The contents of "bash-caller-bug.sh" documented
below.
$ bash bash-caller-bug.sh
calling 'func2' in a subshell from line 33
this is 'func1' at line 25 -- so where we end?
Bash backtrace:
25 func1 ./bash-caller-bug.sh
29 func2 ./bash-caller-bug.sh
33 main ./bash-caller-bug.sh
$ source bash-caller-bug.sh
calling 'func2' in a subshell from line 33
this is 'func1' at line 1 -- so where we end?
Bash backtrace:
1 func1 ./bash-caller-bug.sh
-27 func2 ./bash-caller-bug.sh
33 source ./bash-caller-bug.sh
Repeat-By:
#!/bin/bash -e
# besides kill, there is no reliable way to terminate a script
# from a subshell [= anything running between (), i.e. $()].
die() {
local -i n=0
echo -n "$1" >&2
[[ "$2" != "0" ]] \
&& echo "( function returned error "$2" )" >&2 \
|| echo >&2;
echo "Bash backtrace:" >&2
while ( [[ true ]] ); do
local frame=$(caller $n)
local msg="\t$frame"
[[ $frame ]] && echo -e "$msg" >&2 || break;
n=$((++n))
done
# kill $$;
exit 1; # don't exec subsequent statements from subshell
}
func1() {
die "this is '${FUNCNAME}' at line ${LINENO} -- so where we
end?" 0
}
func2() {
echo "$(func1)";
}
echo "calling 'func2' in a subshell from line ${LINENO} $(func2)";
# END OF FILE
