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153fcaa6c1
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com> |
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.. | ||
ash_test | ||
hush_test | ||
msh_test | ||
ash_doc.txt | ||
ash_ptr_hack.c | ||
ash.c | ||
bbsh.c | ||
brace.txt | ||
builtin_read.c | ||
builtin_read.h | ||
Config.in | ||
cttyhack.c | ||
hush_doc.txt | ||
hush_leaktool.sh | ||
hush.c | ||
Kbuild | ||
lash_unused.c | ||
match.c | ||
match.h | ||
math.c | ||
math.h | ||
msh_unused.c | ||
random.c | ||
random.h | ||
README | ||
README.job | ||
shell_common.c | ||
shell_common.h |
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)