hush: add support for "set -e"

function                                             old     new   delta
run_list                                             978    1046     +68
o_opt_strings                                         24      32      +8
reset_traps_to_defaults                              136     142      +6
pick_sighandler                                       57      60      +3
packed_usage                                       31772   31770      -2
hush_main                                            983     961     -22
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 4/2 up/down: 85/-24)             Total: 61 bytes

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

4 files changed, 45 insertions, 0 deletions

diff --git a/shell/hush_test/hush-signals/signal8.right b/shell/hush_test/hush-signals/signal8.right
new file mode 100644
index 000000000..39572f30e
--- /dev/null
+++ b/shell/hush_test/hush-signals/signal8.right
@@ -0,0 +1,3 @@
+Removing traps
+End of exit_func
+Done: 0
diff --git a/shell/hush_test/hush-signals/signal8.tests b/shell/hush_test/hush-signals/signal8.tests
new file mode 100755
index 000000000..731af7477
--- /dev/null
+++ b/shell/hush_test/hush-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: $?
diff --git a/shell/hush_test/hush-signals/signal9.right b/shell/hush_test/hush-signals/signal9.right
new file mode 100644
index 000000000..39572f30e
--- /dev/null
+++ b/shell/hush_test/hush-signals/signal9.right
@@ -0,0 +1,3 @@
+Removing traps
+End of exit_func
+Done: 0
diff --git a/shell/hush_test/hush-signals/signal9.tests b/shell/hush_test/hush-signals/signal9.tests
new file mode 100755
index 000000000..18e71012b
--- /dev/null
+++ b/shell/hush_test/hush-signals/signal9.tests
@@ -0,0 +1,21 @@
+# Note: the inner script is a test which checks for a different bug
+# (ordering between INT handler and exit on "set -e"),
+# but so far I did not figure out how to simulate it non-interactively.
+
+"$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: $?