This regression also exists on ksh 93v- and ksh2020, from which it
was backported.
Reproducer:
$ (fn() { true; }; fn >/dev/null/ne; true) 2>/dev/null; echo $?
1
Expected output: 0 (as on ksh 93u+).
FreeBSD sh and NetBSD sh are the only other known shells that share
this behaviour. POSIX currently allows both behaviours, but may
require the ksh 93u+ behaviour in future. In any case, this causes
an incompatibility with established ksh behaviour that could easily
break existing ksh scripts.
src/cmd/ksh93/sh/xec.c: sh_exec():
- Commit 23f2e23 introduced a check for jmpval > SH_JMPIO (5).
When a function call pushes context for a redirection, this is
done with the jmpval exit value of SH_JMPCMD (6). Change that to
SH_JMPIO to avoid triggering that check.
src/cmd/ksh93/tests/exit.sh:
- Add regression tests for exit behaviour on various kinds of
shell errors as listed in the POSIX standard, including an error
in a redirection of a function call.
Fixes: https://github.com/ksh93/ksh/issues/310
0dd115e4b4