From 9b67c9942eba3b1a6b008ddab8ee6e542bd3de6b Mon Sep 17 00:00:00 2001
From: Jeff King <peff@peff.net>
Date: Thu, 30 Jun 2016 04:16:18 -0400
Subject: tests: factor portable signal check out of t0005

In POSIX shells, a program which exits due to a signal
generally has an exit code of 128 plus the signal number.
However, ksh uses 256 plus the signal number.  We've
accounted for that in t0005, but not in other tests.  Let's
pull out the logic so we can use it elsewhere.

It would be nice for debugging if this additionally printed
errors to stderr, like our other test_* helpers. But we're
going to need to use it in other places besides the innards
of a test_expect block. So let's leave it as generic as
possible.

Note that we also leave the magic "3" for Windows out of the
generic helper. This is an artifact of the way we use
raise() to kill ourselves in test-sigchain.c, and will not
necessarily apply to all programs. So it's better to keep it
out of the helper, to reduce the chance of confusing it with
a real call to exit(3).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t0005-signals.sh b/t/t0005-signals.sh
index e7f27eb..95f8c05 100755
--- a/t/t0005-signals.sh
+++ b/t/t0005-signals.sh
@@ -11,12 +11,13 @@ EOF
 
 test_expect_success 'sigchain works' '
 	{ test-sigchain >actual; ret=$?; } &&
-	case "$ret" in
-	143) true ;; # POSIX w/ SIGTERM=15
-	271) true ;; # ksh w/ SIGTERM=15
-	  3) true ;; # Windows
-	  *) false ;;
-	esac &&
+	{
+		# Signal death by raise() on Windows acts like exit(3),
+		# regardless of the signal number. So we must allow that
+		# as well as the normal signal check.
+		test_match_signal 15 "$ret" ||
+		test "$ret" = 3
+	} &&
 	test_cmp expect actual
 '
 
diff --git a/t/test-lib-functions.sh b/t/test-lib-functions.sh
index 48884d5..15ef3f8 100644
--- a/t/test-lib-functions.sh
+++ b/t/test-lib-functions.sh
@@ -961,3 +961,18 @@ test_env () {
 		done
 	)
 }
+
+# Returns true if the numeric exit code in "$2" represents the expected signal
+# in "$1". Signals should be given numerically.
+test_match_signal () {
+	if test "$2" = "$((128 + $1))"
+	then
+		# POSIX
+		return 0
+	elif test "$2" = "$((256 + $1))"
+	then
+		# ksh
+		return 0
+	fi
+	return 1
+}
-- 
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