external/cde
1
0
Fork 0
mirror of git://git.code.sf.net/p/cdesktopenv/code synced 2025-03-09 15:50:02 +00:00
Code Issues Releases Wiki Activity

Fix hang in comsubs (rhbz#1062296) (re: 970069a6)

Browse source 
The new command substitution mechanism imported in 970069a6 from
Red Hat patches introduced this bug: backtick-style command
substitutions hang when processing about 117KiB of data or more.

It is fixed by another Red Hat patch:
642af4d6/f/ksh-20140415-hokaido.patch

It saves the value of the shp->comsub flag so that it is set to 2
(usually meaning new-style $(comsubs)) in two specific cases even
when processing backtick comsubs. This stops the sh_subtmpfile()
function in subshell.c from creating a /tmp file. However, I think
that approach is quite ugly, so I'm taking a slightly different one
that has the same effect.

src/cmd/ksh93/include/defs.h,
src/cmd/ksh93/sh/subshell.c:
- Redefine sh_subtmpfile() to pass the comsub flag as an argument.
  (Remove the shp pointer argument, which is redundant; a pointer
  to the shell state can easily be obtained in the function.)

src/cmd/ksh93/sh/xec.c: sh_exec():
- Apply the Red Hat fix by passing flag 2 to sh_subtmpfile().

src/cmd/ksh93/tests/subshell.sh:
- Move regress test from ce68e1be from basic.sh to here; this is
  the place for command substitution tests as they are subshells.
- Add regress test for this bug.

All other changed files:
- Update sh_subtmpfile() calls to pass on the shp->comsub flag.
This commit is contained in:
Martijn Dekker 2020-09-24 05:54:25 +02:00
parent 3654ee73c0
commit 4ce486a7a4
7 changed files with 42 additions and 30 deletions
Download patch file Download diff file Expand all files Collapse all files

2
src/cmd/ksh93/sh/args.c
View file

@ -689,7 +689,7 @@ struct argnod *sh_argprocsub(Shell_t *shp,struct argnod *argp)
ap->argflag &= ~ARG_RAW;
fd = argp->argflag&ARG_RAW;
if(fd==0 && shp->subshell)
sh_subtmpfile(shp);
sh_subtmpfile(shp->comsub);
#if SHOPT_DEVFD
sfwrite(shp->stk,e_devfdNN,8);
pv[2] = 0;