mirror of
https://github.com/sheumann/hush.git
synced 2024-12-22 14:30:31 +00:00
105 lines
3.9 KiB
Plaintext
105 lines
3.9 KiB
Plaintext
Various bits of what is known about busybox shells, in no particular order.
|
|
|
|
2007-11-23
|
|
hush: fixed bogus glob handling; fixed exec <"$1"; added test and echo builtins
|
|
|
|
2007-06-13
|
|
hush: exec <"$1" doesn't do parameter subst
|
|
|
|
2007-05-24
|
|
hush: environment-related memory leak plugged, with net code size
|
|
decrease.
|
|
|
|
2007-05-24
|
|
hush: '( echo ${name )' will show syntax error message, but prompt
|
|
doesn't return (need to press <enter>). Pressing Ctrl-C, <enter>,
|
|
'( echo ${name )' again, Ctrl-C segfaults.
|
|
|
|
2007-05-21
|
|
hush: environment cannot be handled by libc routines as they are leaky
|
|
(by API design and thus unfixable): hush will leak memory in this script,
|
|
bash does not:
|
|
pid=$$
|
|
while true; do
|
|
unset t;
|
|
t=111111111111111111111111111111111111111111111111111111111111111111111111
|
|
export t
|
|
ps -o vsz,pid,comm | grep " $pid "
|
|
done
|
|
The fix is to not use setenv/putenv/unsetenv but manipulate env ourself. TODO.
|
|
hush: meanwhile, first three command subst bugs mentioned below are fixed. :)
|
|
|
|
2007-05-06
|
|
hush: more bugs spotted. Comparison with bash:
|
|
bash-3.2# echo "TEST`date;echo;echo`BEST"
|
|
TESTSun May 6 09:21:05 CEST 2007BEST [we dont strip eols]
|
|
bash-3.2# echo "TEST`echo '$(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)
|