source: vendor/bash/3.1/tests/redir7.sub@ 3951

# weird redirections that caused trouble and were fixed in post-3.0 bash
stuff()
{
        c=1
        ( sleep 5 < /dev/null >/dev/null 2>&1 & ) &
}

exec 3>&1
eval `
exec 4>&1 >&3 3>&-
{
        stuff 4>&-
        echo "c=$c" >&4
}`
echo c1 is $c

unset -f stuff

stuff()
{
        c=2
        ( sleep 5 < /dev/null >/dev/null 2>&1 & )
}

exec 3>&1
eval `
exec 4>&1 >&3 3>&-
{
        stuff 4>&-
        echo "c=$c" >&4
}`
echo c2 is $c

unset -f stuff

stuff()
{
        c=3
        { sleep 5 < /dev/null >/dev/null 2>&1 & } &
}

exec 3>&1
eval `
exec 4>&1 >&3 3>&-
{
        stuff 4>&-
        echo "c=$c" >&4
}`
echo c3 is $c

unset -f stuff

stuff()
{
        c=4
        { sleep 5 < /dev/null >/dev/null 2>&1 & }
}

exec 3>&1
eval `
exec 4>&1 >&3 3>&-
{
        stuff 4>&-
        echo "c=$c" >&4
}`
echo c4 is $c

# fixed in bash-3.1
echo 'exec <&3' | ${THIS_SH} 3<&0