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-o posix: allow invoked programs to inherit FDs > 2

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If there are file descriptors > 2 opened with 'exec' or 'redirect',
ksh93 has always closed them when invoking another pogram. This is
contrary to POSIX which states:
    Utilities other than the special built-ins […] shall be invoked
    in a separate environment that consists of the following. The
    initial value of these objects shall be the same as that for
    the parent shell, except as noted below.
    * Open files inherited on invocation of the shell, open files
      controlled by the exec special built-in plus any
      modifications, and additions specified by any redirections to
      the utility
    * […]
https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_12

src/cmd/ksh93/sh/io.c: sh_redirect():
- When flag==2, do not close FDs > 2 if POSIX mode is active.

src/cmd/ksh93/tests/io.sh:
- Regress-test inheriting FD 7 with and without POSIX mode.

src/cmd/ksh93/sh.1:
- Update.
This commit is contained in:
Martijn Dekker 2020-09-01 08:11:27 +01:00
parent b301d41731
commit fd977388a2
4 changed files with 13 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

8
src/cmd/ksh93/tests/io.sh
View file

@ -616,5 +616,13 @@ then set -o posix
[[ $(< aha2.txt) == ok2 ]] || err_exit '&> does not redirect stderr'
fi
# In POSIX mode, file descriptors > 2 should remain open when invoking another proram
if [[ -o ?posix ]]
then (set -o posix; exec 7>ok.txt; "$SHELL" -c 'print ok >&7' 2>/dev/null)
[[ $(<ok.txt) == ok ]] || err_exit 'File descriptors > 2 not inherited in POSIX mode'
fi
(exec 7>bad.txt; "$SHELL" -c 'print bad >&7' 2>/dev/null)
[[ $(<bad.txt) == '' ]] || err_exit 'File descriptors > 2 inherited without POSIX mode' "(got $actual)"
# ======
exit $((Errors<125?Errors:125))