ash: fix signal and "set -e" interaction

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

shell/ash_test/ash-signals/signal8.right

@@ -0,0 +1,3 @@
+Removing traps
+End of exit_func
+Done: 0

shell/ash_test/ash-signals/signal8.tests

@@ -0,0 +1,18 @@
+"$THIS_SH" -c '
+exit_func() {
+    echo "Removing traps"
+    trap - EXIT TERM INT
+    echo "End of exit_func"
+}
+set -e
+trap exit_func EXIT TERM INT
+sleep 2
+exit 77
+' &
+
+sleep 1
+# BUG: ash kills -PGRP, but in non-interactive shell we do not create pgrps!
+# In this case, bash kills by PID, not PGRP.
+kill -TERM %1
+wait
+echo Done: $?

shell/ash_test/ash-signals/signal9.right

@@ -0,0 +1,3 @@
+Removing traps
+End of exit_func
+Done: 0

shell/ash_test/ash-signals/signal9.tests

@@ -0,0 +1,21 @@
+# Note: the inner script is a test which checks for a different bug
+# (ordering between INT handler and exit on "set -e"),
+# but so far I did not figure out how to simulate it non-interactively.
+
+"$THIS_SH" -c '
+exit_func() {
+    echo "Removing traps"
+    trap - EXIT TERM INT
+    echo "End of exit_func"
+}
+set -e
+trap exit_func EXIT TERM INT
+sleep 2
+exit 77
+' &
+
+child=$!
+sleep 1
+kill -TERM $child
+wait
+echo Done: $?