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Fix ${ comsub; } killing job control

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Another longstanding whopper of a bug in basic ksh93 functionality:
run a ${ shared-state; } command substitution twice and job control
promptly loses track of all your running jobs. New jobs are tracked
again until you run another two shared-state command substitutions.
This is in at least 93t+, 93u-, 93u+, 93v- and ksh2020.

$ sleep 300 &
[1]	56883
$ jobs						# OK
[1] +  Running                 sleep 300 &
$ v=${ echo hi1; }
$ jobs						# OK
[1] +  Running                 sleep 300 &
$ v=${ echo hi2; }
$ jobs						# Nothing!
$ fg
ksh: fg: no such job

src/cmd/ksh93/sh/subshell.c: sh_subshell():
- The current environment number shp->curenv (a.k.a. sh.curenv) was
  not being restored if the virtual subshell we're leaving is of
  the shared-state command substitution variety as it was wrongly
  considered to be part of the environment that didn't need
  restoring. This caused it to be out of sync with shp->jobenv
  (a.k.a. sh.jobenv) which did get restored from savedcurenv.
  Restore both from savedcurenv at the same time for any subshell.
  (How these numbers are used exactly remains to be discovered.)

src/cmd/ksh93/tests/jobs.sh:
- Added, with a test for this bug to start it off. There is no
  other test script where job control fits, and a lot more related
  fixes are anticipated: https://github.com/ksh93/ksh/issues/119
This commit is contained in:
Martijn Dekker 2021-02-11 13:41:10 +00:00
parent 2996d7ae7c
commit 37a18bab71
4 changed files with 51 additions and 3 deletions
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@ -3,6 +3,11 @@ For full details, see the git log at: https://github.com/ksh93/ksh
Any uppercase BUG_* names are modernish shell bug IDs.
2021-02-11:
- Fixed a bug that caused ksh to lose track of all running background jobs if
a shared-state command substitution of the form v=${ cmd; } was used twice.
2021-02-05:
- Fixed a longstanding bug that caused redirections that store a file