| Various bits of what is known about busybox shells, in no particular order. |
| |
| 2008-02-14 |
| ash: does not restore tty pgrp if killed by HUP. Symptom: Midnight Commander |
| is backgrounded if you started ash under it, and then killed it with HUP. |
| |
| 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) |