hush/shell
Denis Vlasenko 92c0b8222e tail: fix SEGV on "tail -N"
config system: clarify PREFER_APPLETS/SH_STANDALONE effects in help text
2007-05-08 17:27:17 +00:00
..
ash_test fix accumulated whitespace and indentation damage 2007-03-20 11:30:28 +00:00
ash.c ash,kill: use common code for kill applet/builtin 2007-04-29 23:42:54 +00:00
bbsh.c style fixes. No code changes 2007-04-12 00:32:05 +00:00
Config.in tail: fix SEGV on "tail -N" 2007-05-08 17:27:17 +00:00
hush.c hush: fix double-free in "echo TEST &" 2007-05-06 14:15:42 +00:00
Kbuild cmdedit is not a 'command' editing anymore, it's just editing (generic), 2007-01-22 09:03:07 +00:00
lash.c lash: recognize and use NOFORK applets 2007-04-14 11:16:29 +00:00
msh.c shells: remove few statics and duplicated code 2007-04-16 22:34:39 +00:00
README hush: fix double-free in "echo TEST &" 2007-05-06 14:15:42 +00:00
README.job hush: small code shrink; style fixes 2007-04-20 08:35:45 +00:00
susv3_doc.tar.bz2 shell/: add SUSv3 doc for fast & easy reference 2007-04-13 19:44:22 +00:00

Various bits of what is known about busybox shells, in no particular order.

2006-05-06
hush: more bugs spotted. Comparison with bash:
bash-3.2# echo "TEST`date;echo;echo`BEST"
TESTSun May  6 09:21:05 CEST 2007BEST         [we dont strip eols]
bash-3.2# echo "TEST`echo '$(echo ZZ)'`BEST"
TEST$(echo ZZ)BEST                            [we execute inner echo]
bash-3.2# echo "TEST`echo "'"`BEST"
TEST'BEST                                     [we totally mess up this one]
bash-3.2# echo `sleep 5`
[Ctrl-C should work, Ctrl-Z should do nothing][we totally mess up this one]
bash-3.2# if true; then
> [Ctrl-C]
bash-3.2#                                     [we re-issue "> "]
bash-3.2# if echo `sleep 5`; then
> true; fi                                    [we execute sleep before "> "]

2007-05-04
hush: made ctrl-Z/C work correctly for "while true; do true; done"
(namely, it backgrounds/interrupts entire "while")

2007-05-03
hush: new bug spotted: Ctrl-C on "while true; do true; done" doesn't
work right:
# while true; do true; done
[1] 0 true <-- pressing Ctrl-C several times...
[2] 0 true
[3] 0 true
Segmentation fault

2007-05-03
hush: update on "sleep 1 | exit 3; echo $?" bug.
parse_stream_outer() repeatedly calls parse_stream().
parse_stream() is now fixed to stop on ';' in this example,
fixing it (parse_stream_outer() will call parse_stream() 1st time,
execute the parse tree, call parse_stream() 2nd time and execute the tree).
But it's not the end of story.
In more complex situations we _must_ parse way farther before executing.
Example #2: "{ sleep 1 | exit 3; echo $?; ...few_lines... } >file".
Because of redirection, we cannot execute 1st pipe before we parse it all.
We probably need to learn to store $var expressions in parse tree.
Debug printing of parse tree would be nice too.

2007-04-28
hush: Ctrl-C and Ctrl-Z for single NOFORK commands are working.
Memory and other resource leaks (opendir) are not addressed
(testcase is "rm -i" interrupted by ctrl-c).

2007-04-21
hush: "sleep 5 | sleep 6" + Ctrl-Z + fg seems to work.
"rm -i" + Ctrl-C, "sleep 5" + Ctrl-Z still doesn't work
for SH_STANDALONE case :(

2007-04-21
hush: fixed non-backgrounding of "sleep 1 &" and totally broken
"sleep 1 | sleep 2 &". Noticed a bug where successive jobs
get numbers 1,2,3 even when job #1 has exited before job# 2 is started.
(bash reuses #1 in this case)

2007-04-21
hush: "sleep 1 | exit 3; echo $?" prints 0 because $? is substituted
_before_ pipe gets executed!! run_list_real() already has "pipe;echo"
parsed and handed to it for execution, so it sees "pipe"; "echo 0".

2007-04-21
hush: removed setsid() and made job control sort-of-sometimes-work.
Ctrl-C in "rm -i" works now except for SH_STANDALONE case.
"sleep 1 | exit 3" + "echo $?" works, "sleep 1 | exit 3; echo $?"
shows exitcode 0 (should be 3). "sleep 1 | sleep 2 &" fails horribly.

2007-04-14
lash, hush: both do setsid() and as a result don't have ctty!
Ctrl-C doesn't work for any child (try rm -i), etc...
lash: bare ">file" doesn't create a file (hush works)