[git commit master] ash: trap with bad signal name should not abort

[Denys Vlasenko]

commit: http://git.busybox.net/busybox/commit/?id=496d5bf4c6566b7837e61fa83da3fb5851ae446b
branch: http://git.busybox.net/busybox/commit/?id=refs/heads/master

function                                             old     new   delta
trapcmd                                              236     271     +35

Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
---
 shell/ash.c                              |   14 ++++++++++----
 shell/ash_test/ash-signals/signal4.right |    4 ++++
 shell/ash_test/ash-signals/signal4.tests |    5 +++++
 3 files changed, 19 insertions(+), 4 deletions(-)
 create mode 100644 shell/ash_test/ash-signals/signal4.right
 create mode 100755 shell/ash_test/ash-signals/signal4.tests

diff --git a/shell/ash.c b/shell/ash.c
index e285130..0cfa4fc 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -12281,7 +12281,7 @@ trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
 {
 	char *action;
 	char **ap;
-	int signo;
+	int signo, exitcode;
 
 	nextopt(nullstr);
 	ap = argptr;
@@ -12314,10 +12314,15 @@ trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
 	action = NULL;
 	if (ap[1])
 		action = *ap++;
+	exitcode = 0;
 	while (*ap) {
 		signo = get_signum(*ap);
-		if (signo < 0)
-			ash_msg_and_raise_error("%s: bad trap", *ap);
+		if (signo < 0) {
+			/* Mimic bash message exactly */
+			ash_msg("%s: invalid signal specification", *ap);
+			exitcode = 1;
+			goto next;
+		}
 		INT_OFF;
 		if (action) {
 			if (LONE_DASH(action))
@@ -12330,9 +12335,10 @@ trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
 		if (signo != 0)
 			setsignal(signo);
 		INT_ON;
+ next:
 		ap++;
 	}
-	return 0;
+	return exitcode;
 }
 
 
diff --git a/shell/ash_test/ash-signals/signal4.right b/shell/ash_test/ash-signals/signal4.right
new file mode 100644
index 0000000..3260584
--- /dev/null
+++ b/shell/ash_test/ash-signals/signal4.right
@@ -0,0 +1,4 @@
+./signal4.tests: trap: line 3: BADNAME: invalid signal specification
+1
+Trapped
+Ok
diff --git a/shell/ash_test/ash-signals/signal4.tests b/shell/ash_test/ash-signals/signal4.tests
new file mode 100755
index 0000000..6f1c4a9
--- /dev/null
+++ b/shell/ash_test/ash-signals/signal4.tests
@@ -0,0 +1,5 @@
+#!/bin/sh
+
+trap "echo Trapped" BADNAME TERM; echo $?
+kill $$
+echo Ok
-- 
1.6.3.3