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45496405c6
If EV_EXIT causes an exit, use the exception mechanism to unwind
redirections and local variables. This way, if the final command is a
redirected command, an EXIT trap now executes without the redirections.
Because of these changes, EV_EXIT can now be inherited by the body of a
function, so do so. This means that a function no longer prevents a fork
before an exec being skipped, such as in
f() { head -1 /etc/passwd; }; echo $(f)
Wrapping a single builtin in a function may still cause an otherwise
unnecessary fork with command substitution, however.
An exit command or -e failure still invokes the EXIT trap with the
original redirections and local variables in place.
Note: this depends on SHELLPROC being gone. A SHELLPROC depended on
keeping the redirections and local variables and only cleaning up the
state to restore them.
21 lines
675 B
Text
21 lines
675 B
Text
# $FreeBSD$
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failures=0
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check() {
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if [ "$2" != "$3" ]; then
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echo "Failure at $1" >&2
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failures=$((failures + 1))
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fi
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}
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check $LINENO "$(trap "echo bye" EXIT; : >/dev/null)" bye
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check $LINENO "$(trap "echo bye" EXIT; { :; } >/dev/null)" bye
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check $LINENO "$(trap "echo bye" EXIT; (:) >/dev/null)" bye
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check $LINENO "$(trap "echo bye" EXIT; (: >/dev/null))" bye
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check $LINENO "$(${SH} -c 'trap "echo bye" EXIT; : >/dev/null')" bye
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check $LINENO "$(${SH} -c 'trap "echo bye" EXIT; { :; } >/dev/null')" bye
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check $LINENO "$(${SH} -c 'trap "echo bye" EXIT; (:) >/dev/null')" bye
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check $LINENO "$(${SH} -c 'trap "echo bye" EXIT; (: >/dev/null)')" bye
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exit $((failures > 0))
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