testj1939: add omit bind option

This option is needed for j1939 socket functionality test.
Connects wihout bind should not work.

Signed-off-by: Bastian Stender <bst@pengutronix.de>
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>

testj1939.c

@@ -39,6 +39,7 @@ static const char help_msg[] =
 	" -c		Issue connect()\n"
 	" -p=PRIO	Set priority to PRIO\n"
 	" -b		Do normal bind with SA+1 and rebind with actual SA\n"
+	" -o		Omit bind\n"
 	" -n		Emit 64bit NAMEs in output\n"
 	" -w[TIME]	Return after TIME (default 1) seconds\n"
 	"\n"
@@ -47,7 +48,7 @@ static const char help_msg[] =
 	"\n"
 	;
 
-static const char optstring[] = "?vbs::rep:cnw::";
+static const char optstring[] = "?vbos::rep:cnw::";
 
 static void parse_canaddr(char *spec, struct sockaddr_can *paddr)
 {
@@ -111,6 +112,7 @@ int main(int argc, char *argv[])
 	int valid_peername = 0;
 	int todo_send = 0, todo_recv = 0, todo_echo = 0, todo_prio = -1;
 	int todo_connect = 0, todo_names = 0, todo_wait = 0, todo_rebind = 0;
+	int no_bind = 0;
 
 	/* argument parsing */
 	while ((opt = getopt(argc, argv, optstring)) != -1)
@@ -139,6 +141,9 @@ int main(int argc, char *argv[])
 	case 'b':
 		todo_rebind = 1;
 		break;
+	case 'o':
+		no_bind = 1;
+		break;
 	case 'w':
 		schedule_oneshot_itimer(strtod(optarg ?: "1", NULL));
 		signal(SIGALRM, onsigalrm);
@@ -183,6 +188,8 @@ int main(int argc, char *argv[])
 			error(1, errno, "set priority %i", todo_prio);
 	}
 
+	if (!no_bind) {
+
 		if (verbose)
 			fprintf(stderr, "- bind(, %s, %zi);\n", libj1939_addr2str(&sockname), sizeof(sockname));
 		ret = bind(sock, (void *)&sockname, sizeof(sockname));
@@ -199,6 +206,7 @@ int main(int argc, char *argv[])
 			if (ret < 0)
 				error(1, errno, "re-bind()");
 		}
+	}
 
 	if (todo_connect) {
 		if (!valid_peername)