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Decrease SHLVL before doing 'exec' from main shell

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Problem:

$ exec ksh
$ echo $SHLVL
2
$ exec ksh
$ echo $SHLVL
3
$ exec ksh
$ echo $SHLVL
4

...etc. SHLVL is supposed to acount the number of shell processes
that you need to exit before you get logged out. Since ksh was
replacing itself with a new shell in the same process using 'exec',
SHLVL should not increase.

src/cmd/ksh93/bltins/misc.c: b_exec():
- When about to replace the shell and we're not in a subshell,
  decrease SHLVL to cancel out a subsequent increase by the
  replacing shell. Bash and zsh also do this.
This commit is contained in:
Martijn Dekker 2021-05-19 00:02:49 +02:00
parent c828ea8d0d
commit e5e1d4b53e
4 changed files with 15 additions and 3 deletions
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2
src/cmd/ksh93/include/version.h
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@ -21,7 +21,7 @@
#define SH_RELEASE_FORK "93u+m" /* only change if you develop a new ksh93 fork */
#define SH_RELEASE_SVER "1.0.0-beta.2" /* semantic version number: https://semver.org */
#define SH_RELEASE_DATE "2021-05-13" /* must be in this format for $((.sh.version)) */
#define SH_RELEASE_DATE "2021-05-18" /* must be in this format for $((.sh.version)) */
#define SH_RELEASE_CPYR "(c) 2020-2021 Contributors to ksh " SH_RELEASE_FORK
/* Scripts sometimes field-split ${.sh.version}, so don't change amount of whitespace. */