PIPE_SEQ is used most often, having it zero makes code smaller:
function old new delta
done_word 719 707 -12
parse_stream 2546 2531 -15
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
I thought gcc can detect this itself. It doesn't.
function old new delta
run_list 1030 1021 -9
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Was playing with "sleep 3 | exit 3 & wait %1" and noticed that often
SIGCHLD arrives even before I get to signal masking. Can avoid it in this
case.
function old new delta
wait_for_child_or_signal 228 265 +37
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Also add tests. wait5.tests so far fails (but works for ash and dash).
function old new delta
builtin_wait 305 283 -22
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
It would be nice to provide bash-like "remember las exitcode"
thingy, but it's a bit complex. For now, match ash and dash.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Since our "read to malloced buf" routines only gradually grow
allocations, let's be generous here and allow 128k.
Reported by Alex Henrie <alexhenrie24@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Parse this in config files:
DEFINE col ...
DEFINE tbl ...
DEFINE nroff ...
Add width options to nroff command line.
Use "tbl", not "gtbl", as default tbl command.
Export GROFF_NO_SGR=1 and use "col -b -p -x" instead of pager when writing to file.
function old new delta
man_main 735 863 +128
if_redefined - 64 +64
show_manpage 199 169 -30
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 1/1 up/down: 192/-30) Total: 162 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
In this example:
ash -c 'readonly x; echo $(command eval x=2)'
evalstring() is called after forkchild(), which calls popallfiles().
On exception, evalstring() will popfile().
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
It was not properly interruptible, and did not update job status
(the exited processes were still thought of as running).
function old new delta
process_wait_result - 453 +453
wait_for_child_or_signal - 199 +199
run_list 996 1002 +6
checkjobs_and_fg_shell 41 43 +2
builtin_wait 328 215 -113
checkjobs 516 142 -374
------------------------------------------------------------------------------
(add/remove: 2/0 grow/shrink: 2/2 up/down: 660/-487) Total: 173 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Upstream commit:
Date: Sun, 22 Feb 2009 18:10:01 +0800
[JOBS] Fix dowait signal race
This test program by Alexey Gladkov can cause dash to enter an
infinite loop in waitcmd.
#!/bin/dash
trap "echo TRAP" USR1
stub() {
echo ">>> STUB $1" >&2
sleep $1
echo "<<< STUB $1" >&2
kill -USR1 $$
}
stub 3 &
stub 2 &
until { echo "###"; wait; } do
echo "*** $?"
done
The problem is that if we get a signal after the wait3 system
call has returned but before we get to INTON in dowait, then
we can jump back up to the top and lose the exit status. So
if we then wait for the job that has just exited, then it'll
stay there forever.
I made the original change that caused this bug to fix pretty
much the same bug but in the opposite direction. That is, if
we get a signal after we enter wait3 but before we hit the kernel
then it too can cause the wait to go on forever (assuming the
child doesn't exit).
In fact this is pretty much exactly the scenario that you'll
find in glibc's documentation on pause(). The solution is given
there too, in the form of sigsuspend, which is the only way to
do the check and wait atomically.
So this patch fixes Alexey's race without reintroducing the old
bug by converting the blocking wait3 to a sigsuspend.
In order to do this we need to set a signal handler for SIGCHLD,
so the code has been modified to always do that.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
I failed to reproduce the bug (it requires precise timing), but it seems real.
function old new delta
dowait 284 463 +179
setsignal 301 326 +25
signal_handler 59 76 +17
ash_main 1481 1487 +6
localcmd 350 348 -2
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 4/1 up/down: 227/-2) Total: 225 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Upstream commit 1:
Date: Sun, 22 Feb 2009 18:16:13 +0800
[SIGNAL] Remove EXSIG
Now that waitcmd no longer uses EXSIG we can remove it.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Upstream commit 2:
Date: Thu, 2 Oct 2014 21:07:55 +0800
[ERROR] Set exitstatus in onint
Currently the exit status when we receive SIGINT is set in evalcommand
which means that it doesn't always get set. For example, if you press
CTRL-C at the prompt of an interactive dash, the exit status is not
set to 130 as it is in many other Bourne shells.
This patch fixes this by moving the setting of the exit status into
onint which also simplifies evalcommand.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Upstream commit 3:
Date: Fri, 3 Oct 2014 14:07:07 +0800
[EVAL] Do not clobber exitstatus in evalcommand
All originators of EXERROR have been setting the exitstatus for
a while now. So it is no longer appropriate to set it explicitly
in evalcommand.
In fact doing so may cause the original exitstatus to be lost.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Last three coomits:
function old new delta
waitcmd 186 224 +38
dowait 276 284 +8
waitforjob 104 107 +3
localcmd 348 350 +2
showjobs 64 61 -3
forkshell 263 260 -3
raise_interrupt 93 67 -26
blocking_wait_with_raise_on_sig 40 - -40
evalcommand 1264 1208 -56
evaltree 809 498 -311
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This loses an insignificant optimization, but may allow backporting
of some recent-ish dash fixes.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit should have deleted these two statements:
commit c0e007663d
Author: Ron Yorston <rmy@pobox.com>
Date: Thu Oct 29 11:30:55 2015 +0000
ash: simplify EOF/newline handling in list parser
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Upstream commit:
Date: Wed, 8 Sep 2010 20:07:26 +0800
[EXPAND] Fix ifsfirst/ifslastp leak
As it stands expandarg may return with a non-NULL ifslastp which
then confuses any subsequent ifsbreakup user that doesn't clear
it directly.
What's worse, if we get interrupted before we hit ifsfree in
expandarg we will leak memory.
This patch fixes this by always calling ifsfree in expandarg
thus ensuring that ifslastp is always NULL on the normal path.
It also adds an ifsfree call to the RESET path to ensure that
memory isn't leaked.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Fallout 1:
Date: Mon, 18 Oct 2010 10:55:42 +0800
[EXPAND] Fix ifsfirst/ifslastp leak in casematch
The commit f42e443bb511ed3224f09b4fcf0772438ebdbbfa
[EXPAND] Fix ifsfirst/ifslastp leak
revealed yet another ifsfirst/ifslastp leak in casematch.
Previously it was hidden because ifsfirst/ifslastp was cleared
unconditionally on entry (which caused the leakage of those
entries).
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Fallout 2:
Date: Sun, 28 Nov 2010 21:09:51 +0800
[EXPAND] Free IFS state in evalbackcmd
On Sun, Nov 07, 2010 at 04:04:20PM -0600, Jonathan Nieder wrote:
> Herbert Xu wrote:
> > commit f42e443bb511ed3224f09b4fcf0772438ebdbbfa
> > Author: Herbert Xu <herbert@gondor.apana.org.au>
> > Date: Wed Sep 8 20:07:26 2010 +0800
> >
> > [EXPAND] Fix ifsfirst/ifslastp leak
>
> Another puzzle bisecting to f42e443bb. This one comes from the
> grub-mkconfig script:
>
> $ sh -c 'datadir=/usr/share; pkgdatadir=${datadir}/`cat`' 2>&1 | cat -A
> cat: M-^\^M^F^HM-4^M^F^HM-(^M^F^H: No such file or directory$
> cat: M-(^M^F^H: No such file or directory$
>
> Still reproducible with 016b529. I'll try to find time to look into
> it, but thought you might like to know nevertheless.
This is the symptom of another leak. In this case evalbackcmd
occurs in the middle of an expansion (as it should) but the forked
child never clears the previous IFS state.
This patch adds the missing ifsfree call.
This wasn't as much of a problem as the previously discovered leaks
since all it means is that the child gets to carry around the parent's
expansion state and the child is usually short-lived.
Reported-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Fallout 3:
Date: Tue, 15 Mar 2011 16:01:34 +0800
[EXPAND] Free IFS state after here document expansion
Here's another bug bisecting to f42e443bb ([EXPAND] Fix
ifsfirst/ifslastp leak, 2010-09-08). It was found with the following
test case, based on the configure script for Tracker:
dash -x -c '
<<-_ACEOF
$@
_ACEOF
exec
' - abcdefgh
+
+ exec ?a
exec: 1: : Permission denied
The missing ifsfree call is in expandarg when it returns to openhere
during here document expansion.
Reported-by: Aurelien Jarno <aurel32@debian.org>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
function old new delta
ifsfree - 66 +66
ash_main 1490 1495 +5
argstr 1154 1159 +5
evalcase 275 270 -5
expandarg 972 888 -84
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 2/2 up/down: 76/-89) Total: -13 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Upstream commit "[EVAL] Force fork if any trap is set, not just on EXIT"
had a similar code as our fix to that bug.
Eliminate some superficial differences.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
