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# Tests for both trap builtin and TRAP* functions.
%prep
setopt localtraps
mkdir traps.tmp && cd traps.tmp
%test
fn1() {
trap 'print EXIT1' EXIT
fn2() { trap 'print EXIT2' EXIT; }
fn2
}
fn1
0:Nested `trap ... EXIT'
>EXIT2
>EXIT1
fn1() {
TRAPEXIT() { print EXIT1; }
fn2() { TRAPEXIT() { print EXIT2; }; }
fn2
}
fn1
0: Nested TRAPEXIT
>EXIT2
>EXIT1
fn1() {
trap 'print EXIT1' EXIT
fn2() { trap - EXIT; }
fn2
}
fn1
0:Nested `trap - EXIT' on `trap ... EXIT'
>EXIT1
fn1() {
TRAPEXIT() { print EXIT1; }
fn2() { trap - EXIT; }
fn2
}
fn1
0:Nested `trap - EXIT' on `TRAPEXIT'
>EXIT1
# We can't test an EXIT trap for the shell as a whole, because
# we're inside a function scope which we don't leave when the
# subshell exits. Not sure if that's the correct behaviour, but
# it's sort of consistent.
( fn1() { trap 'print Function 1 going' EXIT; exit; print Not reached; }
fn2() { trap 'print Function 2 going' EXIT; fn1; print Not reached; }
fn2
)
0:EXIT traps on functions when exiting from function
>Function 1 going
>Function 2 going
# $ZTST_exe is relative to the parent directory.
# We ought to fix this in ztst.zsh...
cd ..
$ZTST_exe -fc 'TRAPEXIT() { print Exited.; }'
0:EXIT traps on a script
>Exited.
fn1() {
trap
trap 'print INT1' INT
fn2() { trap 'print INT2' INT; trap; }
trap
fn2
trap
}
fn1
0: Nested `trap ... INT', not triggered
>trap -- 'print INT1' INT
>trap -- 'print INT2' INT
>trap -- 'print INT1' INT
fn1() {
trap
TRAPINT() { print INT1; }
fn2() { TRAPINT() { print INT2; }; trap; }
trap
fn2
trap
}
fn1
0: Nested `trap ... INT', not triggered
>TRAPINT () {
> print INT1
>}
>TRAPINT () {
> print INT2
>}
>TRAPINT () {
> print INT1
>}
fn1() {
trap 'print INT1' INT
fn2() { trap - INT; trap; }
trap
fn2
trap
}
fn1
0: Nested `trap - INT' on untriggered `trap ... INT'
>trap -- 'print INT1' INT
>trap -- 'print INT1' INT
# Testing the triggering of traps here is very unpleasant.
# The delays are attempts to avoid race conditions, though there is
# no guarantee that they will work. Note the subtlety that the
# `sleep' in the function which receives the trap does *not* get the
# signal, only the parent shell, which is waiting for a SIGCHILD.
# (At least, that's what I think is happening.) Thus we have to wait at
# least the full two seconds to make sure we have got the output from the
# execution of the trap.
print 'This test takes at least three seconds...' >&8
fn1() {
trap 'print TERM1' TERM
fn2() { trap 'print TERM2; return 1' TERM; sleep 2; }
fn2 &
sleep 1
kill -TERM $!
sleep 2
}
fn1
0: Nested `trap ... TERM', triggered on inner loop
>TERM2
print 'This test, too, takes at least three seconds...' >&8
fn1() {
trap 'print TERM1; return 1' TERM
fn2() { trap 'print TERM2; return 1' TERM; }
fn2
sleep 2
}
fn1 &
sleep 1
kill -TERM $!
sleep 2
0: Nested `trap ... TERM', triggered on outer loop
>TERM1
TRAPZERR() { print error activated; }
fn() { print start of fn; false; print end of fn; }
fn
fn() {
setopt localoptions localtraps
unfunction TRAPZERR
print start of fn
false
print end of fn
}
fn
unfunction TRAPZERR
print finish
0: basic localtraps handling
>start of fn
>error activated
>end of fn
>start of fn
>end of fn
>finish
TRAPZERR() { print 'ERR-or!'; }
f() { print f; false; }
t() { print t; }
f
f && t
t && f && true
t && f
testunset() {
setopt localtraps
unset -f TRAPZERR
print testunset
false
true
}
testunset
f
1: more sophisticated error trapping
>f
>ERR-or!
>f
>t
>t
>f
>ERR-or!
>testunset
>f
>ERR-or!
f() {
setopt localtraps
TRAPWINCH() { print "Window changed. That wrecked the test."; }
}
f
f
functions TRAPWINCH
1:Unsetting ordinary traps with localtraps.
#
# Returns from within traps are a perennial problem.
# The following two apply to returns in and around standard
# ksh-style traps. The intention is that a return value from
# within the function is preserved (i.e. statuses set by the trap
# are ignored) unless the trap explicitly executes `return', which makes
# it return from the enclosing function.
#
fn() { trap 'true' EXIT; return 1; }
fn
1: ksh-style EXIT traps preserve return value
inner() { trap 'return 3' EXIT; return 2: }
outer() { inner; return 1; }
3: ksh-style EXIT traps can force return status of enclosing function
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