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* [EXPAND] Fix ifsfirst/ifslastp leakHerbert Xu2010-09-08
| | | | | | | | | | | | | | | | 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>
* [JOBS] Debug compile fixmaximilian attems2010-09-08
| | | | | | | | | | | No point in tracing a no longer undeclared "ps->cmd", fixes: jobs.c: In function \u2018commandtext\u2019: jobs.c:1192: error: \u2018ps\u2019 undeclared (first use in this function) jobs.c:1192: error: (Each undeclared identifier is reported only once jobs.c:1192: error: for each function it appears in.) Signed-off-by: maximilian attems <max@stro.at> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [VAR] Fix varinit ordering that broke fcJilles Tjoelker2010-09-08
| | | | | | | | | | | | | | | Git commit 0df96793ef6aa103df228d7dfe56099b7d721a15 "[SHELL] Add preliminary LINENO support" added the LINENO variable in the middle of other initialized variables, causing some macros for TERM and HISTSIZE to break (both of these are only used if libedit support is compiled in, which is not the case by default). The breakage is the same as can be seen by setting HISTSIZE=0. Also add a comment warning about this. Reported-by: Wez Furlong <kingwez@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [EVAL] Check exit for eval NSUBSHELLGerrit Pape2010-07-06
| | | | | | | | | | | | | | | Example: $ dash -c 'set -e; (false); echo here' here With this commit, dash exits 1 before echo. The bug was reported by Stefan Fritsch through http://bugs.debian.org/514863 Signed-off-by: Gerrit Pape <pape@smarden.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [EVAL] Removed dead code for eval NPIPEHerbert Xu2010-07-06
| | | | | | The notyet code is identical to the current code. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [VAR] Fix loss of variables when hash collidesHerbert Xu2010-07-06
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Brian Koropoff reported that the new var patches broke the following script: #!/bin/dash GDM_LANG="bar" OPTION="foo" unset GDM_LANG # OPTION has mysteriously become unset echo "$OPTION" He correctly diagnosed this as a result of removing all variables in the hash chain preceding the one that should be removed in setvareq. He also provided a patch to fix this. This patch is based on his but without keeping the original vpp. As a result, we now store new variables at the end of the hash chain instead of the beginning. To make this work, setvareq/setvar now returns the vp pointer modified. In case they're used to unset a variable the pointer returned is undefined. This is because mklocal needs it and used to get it by assuming that the new variable always appear at the beginning of the chain. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [EVAL] Don't clear eflag in evalbackcmdGerrit Pape2010-06-28
| | | | | | | | | | | | | | | | | | | | | | According to http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_12 "A subshell environment shall be created as a duplicate of the shell environment, except that signal traps set by that shell environment shall be set to the default values." Currently the eflag is cleared when forking a subshell, e.g. $ dash -c 'set -e ; z=$(false;echo foo) ; echo $z' foo With this commit the eflag is preserved for subshells, and dash exits 1 before echo. The problem was reported by Vincent Lefevre through http://bugs.debian.org/514863 Signed-off-by: Gerrit Pape <pape@smarden.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [BUILTIN] Continue after EINTR in read(1) with no pending signalsHerbert Xu2010-05-29
| | | | | | | | | | | | The recent introduction of SIGCHLD trapping broke read(1) as each SIGCHLD may cause read(1) to return prematurely. Now if we did have a trap for SIGCHLD read(1) should actually do this. However, returning when SIGCHLD isn't trapped is wrong. This patch fixes this by checking for EINTR and pendingsigs in read(1). Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [JOBS] Fix wait regression where it does not wait for all jobsHerbert Xu2010-05-27
| | | | | | | | | | | The sigsuspend patch broke wait by making it return after just one job has completed. This is because we rely on pendingsigs to signal work and never clear it until waitcmd finishes. This patch adds a separate gotsigchld for this purpose so we can clear it before we start waiting. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [EXPAND] Fix corruption of redirections with byte 0x81Jilles Tjoelker2010-05-27
| | | | | | | | | | | | | | | | | | In other ash variants, a partial implementation of ksh-like cmd >file* adds and removes CTLESC bytes ('\x81') in redirection filenames, preserving 8-bit transparency. Long ago, dash removed the code to add the CTLESC bytes, but not the code to remove them, causing corruption of filenames containing CTLESC. This commit removes the code to remove the CTLESC bytes. The CTLESC byte occurs frequently in UTF-8 encoded non-Latin text. This bug has been reported various times to Ubuntu and Debian (e.g. Launchpad Ubuntu #422298). This patch is the same as the one submitted by Alexander Korolkov in Ubuntu #422298. Signed-off-by: Jilles Tjoelker <jilles@stack.nl> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [EVAL] Force fork if any trap is set, not just on EXITJilles Tjoelker2010-05-27
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | In some cases the shell executes a subshell or an external command in the current process. This is not done if a trap on EXIT has been set, so that that trap can execute after the subshell or external command has finished. Extend that check to all traps. (A trap is "set" if a non-empty command string has been attached to it.) Improve encapsulation by exporting an accessor function for this and making the trap array static again. This is much like FreeBSD SVN r194127, enhanced to apply to subshells also (see FreeBSD SVN r194774). Example: dash -c '{ trap "echo moo" TERM; sleep 3; }& sleep 1; kill $!;wait' This should print "moo" after 3 seconds. Example: dash -c '{ trap "echo moo" TERM; (sleep 3) }& sleep 1; kill $!;wait' The same. Example: dash -c '{ trap "echo moo" TERM; sleep 3; :; }& sleep 1; kill $!;wait' This works correctly even without this patch. Signed-off-by: Jilles Tjoelker <jilles@stack.nl> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [REDIR] Fix popredir on abnormal exit from built-inHerbert Xu2010-05-27
| | | | | | | | | Just like the poplocalvar problem recently fixed, redirections can also be leaked in case of an abnormal exit. This patch fixes it using the same method as poplocalvar, by storing the previous redirection state and restoring to that point. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [REDIR] Move null redirect checks into callerHerbert Xu2010-05-27
| | | | | | | | | The null redirect checks were added as an optimisation to avoid unnecessary memory allocations. However, we could avoid this completely by simply making the caller avoid making a redirection unless it is not null. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [VAR] Do not poplocalvars prematurely on regular utilitiesHerbert Xu2010-05-27
| | | | | | | | | | | The recent cmdenviron removal broke regular utilities by calling poplocalvars too early. This patch fixes that by postponing the poplocalvars for regular utilities until they have completed. In order to ensure that local still works, it is now a special built-in. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [VAR] Document local command behaviour changeHerbert Xu2010-05-27
| | | | | | | | The localvar nesting changeset causes local to fail when used outside functions. While this behaviour is consistent with other shells, it is a change in dash's beavhiour. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [VAR] Fix poplocalvar on abnormal exit from functionHerbert Xu2010-05-27
| | | | | | | | | | The new localvar code broke the abnormal exit from functions and built-ins by not restoring the original localvar state. This patch fixes this by storing the previous localvar state so that we always unwind correctly in case of an abnormal exit. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [VAR] Replace cmdenviron with localvarsHerbert Xu2010-05-26
| | | | | | | | | | This patch replaces the cmdenviron mechanism for temporary command variables with the localvars mechanism used by functions. This reduces code size, and more importantly, makes the variable assignment take effect immediately as required by POSIX. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [VAR] Move unsetvar functionality into setvareqHerbert Xu2010-05-26
| | | | | | | | This patch moves the unsetvar code into setvareq so that we can no have a pathological case of an unset variable hanging around unless it has a bit pinning it like VEXPORT. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [VAR] Fix poplocalvar leakHerbert Xu2010-05-26
| | | | | | | | | | When a variable is marked as local, we set VSTRFIXED on its vp recored. However, poplocalvar never clears this flag for variables that were unset to begin with. Thus if you ever made an unset variable local, it would get the VSTRFIXED bit and stick around forever. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [VAR] Add localvars nestingHerbert Xu2010-05-26
| | | | | | | This patch adds localvars nesting infrastructure so we can reuse the localvars mechanism for command evaluation. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [EVAL] Fix command -- crashGerrit Pape2010-05-03
| | | | | | | | | | | | | | | parse_command_args() returning a **argv pointer with *argv == 0 makes dash segfault in find_command(). To reproduce run dash -c 'command --' With this commit, parse_command_args() returns 0 if *argv is null after parsing --, and so fixes the subsequent segfault. Reported by Jonny through http://bugs.debian.org/579543 Signed-off-by: Gerrit Pape <pape@smarden.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [JOBS] Fix for job control off warningH. Peter Anvin2010-04-15
| | | | | | | | | | | There seems to be a problem with the new version of dash with job control off. I can't tell if it is just a warning or is a manifest bug. usr/dash/trap.c: In function `exitshell': usr/dash/trap.c:376: warning: suggest braces around empty body in an `if' statement Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [BUILTIN] Use faccessat if availableHerbert Xu2010-04-02
| | | | | | | | | | | | Eric Blake suggested that we should use faccessat so that ACLs and other corner cases are handled correctly. This patch does exactly that. Note that faccessat doesn't handle ACLs when euid != uid, as this case is currently implemented by glibc instead of the kernel, using code similar to the existing dash test. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* Release 0.5.6.Herbert Xu2010-04-02
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* [BUILTIN] Make trap signal name/number errors non-fatal.Herbert Xu2010-04-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | On Wed, Feb 24, 2010 at 10:23:34AM +0000, Peter Kjellerstedt wrote: > > there seems to be a problem with the trap implementation in dash > (tested with 0.5.4 and 0.5.5.1). If I specify a signal which is not > supported, the shell unconditionally aborts. E.g., I had expected > the following to print foo (like bash and zsh do): > > # dash -c 'trap "echo trap executed" UNKNOWNSIGNAL || echo "foo"' > trap: 1: UNKNOWNSIGNAL: bad trap > > This means I cannot write a construct like the following to take > advantage of the ERR signal which is present in some shells: > > trap "echo ERR trap executed" ERR 2>/dev/null || : > > I also checked the POSIX documentation, and quoting from > http://www.opengroup.org/onlinepubs/009695399/utilities/trap.html > (exit status): "For both interactive and non-interactive shells, > invalid signal names [XSI] [Option Start] or numbers [Option End] > shall not be considered a syntax error and do not cause the shell > to abort." This patch replaces sh_error with a outfmt + return 1 in trapcmd so that these errors are no longer fatal. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [BUILTIN] Use TMPDIR in mkbuiltinsmaximilian attems2010-04-02
| | | | | | | | while merging upstream dash in klibc, noticed that klibc dash had grown that useful feature. Signed-off-by: maximilian attems <max@stro.at> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [ARITH] Fix logical or result valueJilles Tjoelker2010-03-10
| | | | | | | | | | | Another change I'm making to the arith code is making || return 0 or 1 only, matching C, POSIX and other shells. Apart from the compliance issue, it is also bad to expose implementation details like the exact meaning of 'noeval' to scripts such that they may come to depend on them. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [REDIR] Do not truncate file for FROMTO redirectionHerbert Xu2010-03-09
| | | | | | | | | | | | | | | | On Tue, Jun 23, 2009 at 10:06:30AM +0000, Nikola Vladov wrote: > May be this is a bug: > > echo XX > uu > cat <> uu > > dash truncates file uu. The open flag O_TRUNC must be removed. > I'm not 100% shure what POSIX say about: program <> file Indeed, this is a bug we inherited from NetBSD. This patch removes the O_TRUNC flag for FROMTO. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [ARITH] Fix binary operator parsingHerbert Xu2010-03-09
| | | | | | | | | | | | | Jilles Tjoelker reported that binary operator parsing doesn't respect operator precedence correctly in the case where a lower- precedence operator is followed by a higher-precedence operator, and then by a lower-precedence operator. This patch fixes this by stopping when we encounter a binary oeprator with a precedence lower than one that we have already encountered. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [BUILD] Fix changelog entryHerbert Xu2010-03-09
| | | | Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [BUILTIN] Fix off-by-one recordregion in readcmdHerbert Xu2009-11-26
| | | | | | | | | | | | | | | | | | | | | | | Alexey Gladkov <gladkov.alexey@gmail.com> wrote: > > I found another example: > > $ tr -d '[:print:]' < /etc/passwd |tr -d '\t\n' |wc -c > 0 > > $ dash -c 'while read o p; do printf "[%s] [%s]\n" "$o" "$p"; done < > /etc/passwd' |tr -d '[:print:]' |tr -d '[:space:]' |wc -c > 61 > > bug is not fixed yet :( This bug is caused by an off-by-one error in the recordregion call in readcmd. It included the terminating NUL in the region which causes ifsbreakup to include the string after it for scanning. Setting the correct length fixes the problem. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [PARSER] Fix syntax array sizeJim Meyering2009-11-04
| | | | | | | | | | | | | | | On Mon, Sep 28, 2009 at 11:00:05AM +0200, Jim Meyering wrote: > A DEL (0177, dec 127) byte in a here-document would cause dash to > access uninitialized memory at the end of one of the syntax.c tables, > since those tables are sized to accommodate a maximum index of > BASESYNTAX + 126. Make the generated tables one byte larger. > printf ':<<\\E\n\200y\nE'|./dash > * src/mksyntax.c (filltable): Use 258, not 257 as the size, > so that BASESYNTAX(=130) + 127 is a valid index. > (print): Likewise. > Don't emit explicit array dimension in declaration. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [CD] Lookup PWD after going through CDPATHHerbert Xu2009-08-31
| | | | | | | | | | | | | | | | | | | | | | | On Tue, Jul 14, 2009 at 09:39:03PM +0000, Eric Blake wrote: > For the cd command, POSIX 2008 requires that after all pathnames in CDPATH > have been tested and failed in step 5, then step 6 interprets the directory > argument relative to PWD. In other words, this demonstrates a bug: > > $ dash -c 'cd /tmp; mkdir -p foo; CDPATH=oops; cd foo; echo $?; pwd' > cd: 1: can't cd to foo > 2 > /tmp > > while bash gets it correct: > > $ bash -c 'cd /tmp; mkdir -p foo; CDPATH=oops; cd foo; echo $?; pwd' > 0 > /tmp/foo This patch fixes the problem. Reported-by: Eric Blake <ebb9@byu.net> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [BUILTIN] Avoid compiler warnings on isdigitEric Blake2009-08-31
| | | | | | | Pass correct type to ctype macro. Signed-off-by: Eric Blake <ebb9@byu.net> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [BUILTIN] Add another missing LC_COLLATE to mkbuiltinsMatthew Burgess2009-08-31
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | On Sat, Aug 15, 2009 at 06:07:16PM +0000, Matthew Burgess wrote: > > My system has Coreutils-7.4 compiled with the i18n patch from > http://cvs.fedoraproject.org/viewvc/devel/coreutils/coreutils-i18n.patch. > > Using this to compile dash, when in an en_GB.UTF-8 locale, I get the following error: > > if gcc -DHAVE_CONFIG_H -I. -I. -I.. -include ../config.h -DBSD=1 -DSHELL -DIFS_BROKEN -Wall -g -O2 -MT eval.o -MD -MP -MF ".deps/eval.Tpo" -c -o eval.o eval.c; \ > then mv -f ".deps/eval.Tpo" ".deps/eval.Po"; else rm -f ".deps/eval.Tpo"; exit 1; fi > eval.c: In function ‘evalcommand’: > eval.c:810: error: ‘EXECCMD’ undeclared (first use in this function) > eval.c:810: error: (Each undeclared identifier is reported only once > eval.c:810: error: for each function it appears in.) > eval.c:812: error: ‘COMMANDCMD’ undeclared (first use in this function) > make[3]: *** [eval.o] Error 1 > > This is because the src/mkbuiltins script ends up generating an incomplete > src/builtins.h file. This, in turn, is caused by 'sort -u -k 3,3' not > working correctly. > > The attached patch fixes/works around things by setting LC_CTYPE=C, thus > overriding the build environment (in a similar manner to the earlier call to > 'sort' in that same script). I've changed it to use LC_COLLATE. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [BUILTIN] Fix NUL termination in readcmdHerbert Xu2009-08-31
| | | | | | | | | | | | Commit 55c46b7286f5d9f2d8291158203e2b61d2494420 ([BUILTIN] Honor tab as IFS whitespace when splitting fields in readcmd) introduced a bug where sometimes garbage would follow the last field preceding the end-of-line. This was caused by an off-by-one error in the string length calculation. This patch fixes the bug. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [EVAL] Revert SKIPEVAL into EXEXITHerbert Xu2009-08-11
| | | | | | | Now that eval handles EV_TESTED correctly, we can remove the SKIPEVAL hack and simply use EXEXIT for set -e. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [EVAL] Pass EV_TESTED into evalcmdHerbert Xu2009-08-11
| | | | | | | | | | | | | | | | | | This patch fixes the case where the eval command is used with set -e and as part of a construct that should not cause the shell to abort, e.g., as part of the condition of an if statement. This is achieved by propagating the EV_TESTED flag into the evalstring function through evalcmd. As this alters the prototype of evalcmd it is now invoked explicitly by evalbltin. The built-in infrastructure has been changed to accomodate this special case. In order to ensure that the EXIT trap is properly executed this patch clears evalskip in exitshell. This wasn't needed before because of the broken way evalstring worked where it always clears evalskip when called by minusc. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [SHELL] Add preliminary LINENO supportRocky Bernstein2009-08-11
| | | | | | | | | | | | | | | | | | | | | | | Looks like in contrast to what the dash.1 manual page says, expansion of PS{1,2,4} does work. Here is a little patch to set LINENO. The ways in that it is less than ideal mirror the ways that the line number error reporting is also less than ideal. For example if you run this: ( x=$((1/0)) # Just to add another line # And another ) # error reports this line The error reported will be the closing parenthesis even though I think most people would prefer the error to be the one where x was set. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [BUILTIN] Honor tab as IFS whitespace when splitting fields in readcmdStefan Potyra2009-08-11
| | | | | | | | | | | | | | | | | | | When I try to split fields by tabs, dash doesn't honour multiple tabs between fields as whitespace (at least that's how I interpret [1], please correct me if I'm wrong). #!/bin/sh # "1\t2\t\t3" TESTSTRING="1 2 3" # only "\t" IFS=" " echo "$TESTSTRING" | while read p1 p2 p3; do echo "p1=${p1}, p2=${p2}, p3=${p3}" done Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [EXPAND] Fix quoted pattern patch breakageHerbert Xu2009-06-27
| | | | | | | | | | | | | | The change [EXPAND] Do not quote back slashes in parameter expansions outside quotes broke quote removal after parameter expansion. This is because its effecte extended beyond that of quoted patterns. This patch fixes this by limiting the change to just quoted patterns. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [REDIR] Fix incorrect savefd conversionsHerbert Xu2009-06-27
| | | | | | | | | When I added savefd we may end up closing stderr if that is how we get to the tty. This patch fixes by adding a second argument to indicate what fd should be closed which lets jobs.c get around the problem. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [MAN] Update manual page to differentiate dash from ashGerrit Pape2009-05-23
| | | | | | | | | | | | Rename sh to dash in the header and synopsis; remove reference to the 4.4 BSD release in the description, and replace the history information with a reference to NetBSD's ash. Suggested by jaalto through http://bugs.debian.org/499838 Signed-off-by: Gerrit Pape <pape@smarden.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [PARSER] Use CHKNL to parse case statementsHerbert Xu2009-02-22
| | | | | | | | Instead of open-coding the newline loop, use the CHKNL flag to get readtoken to eat the newlines before the in keyword for the case statement. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [PARSER] Allow newlines after var name in for statementsHerbert Xu2009-02-22
| | | | | | | | | POSIX allows newlines before the "in" keyword in for statements so we should too. Thanks to Maximilian Bernöcker for reporting this. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [JOBS] Do not close stderr when /dev/tty fails to openHerbert Xu2009-02-22
| | | | | | | | | As it stands if we fail to open /dev/tty we end up closing stderr after saving it at a higher fd. Thanks to David van Gorkom for reporting this. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [SIGNAL] Remove EXSIGHerbert Xu2009-02-22
| | | | | | Now that waitcmd no longer uses EXSIG we can remove it. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [JOBS] Fix dowait signal raceHerbert Xu2009-02-22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* Release 0.5.5.1.Herbert Xu2009-01-14
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* [BUILD] Add arith_yacc.h to dash_SOURCESHerbert Xu2009-01-14
| | | | | | | The file arith_yacc.h was missing from dash_SOURCES causing it to be excluded from the generated tar file. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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