cangen: Enable sending of RTR CAN frames

Signed-off-by: Rostislav Lisovy <lisovy@gmail.com>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>

diff --git a/cangen.c b/cangen.c
index 4f37808a97e779c9489867cc621b880417a68913..efb8251a4b45a522308dc6eb9cd47a7e78224ea6 100644 (file)
--- a/cangen.c
+++ b/cangen.c
@@ -101,6 +101,7 @@ void print_usage(char *prg)
                " write() syscalls)\n");
        fprintf(stderr, "         -x            (disable local loopback of "
                "generated CAN frames)\n");
+       fprintf(stderr, "         -R            (send RTR frame)\n");
        fprintf(stderr, "         -v            (increment verbose level for "
                "printing sent CAN frames)\n\n");
        fprintf(stderr, "Generation modes:\n");
@@ -141,6 +142,7 @@ int main(int argc, char **argv)
        unsigned char dlc_mode = MODE_RANDOM;
        unsigned char loopback_disable = 0;
        unsigned char verbose = 0;
+       unsigned char rtr_frame = 0;
        int count = 0;
        uint64_t incdata = 0;
 
@@ -165,7 +167,7 @@ int main(int argc, char **argv)
        signal(SIGHUP, sigterm);
        signal(SIGINT, sigterm);
 
-       while ((opt = getopt(argc, argv, "ig:eI:L:D:xp:n:vh?")) != -1) {
+       while ((opt = getopt(argc, argv, "ig:eI:L:D:xp:n:vRh?")) != -1) {
                switch (opt) {
 
                case 'i':
@@ -224,6 +226,10 @@ int main(int argc, char **argv)
                        loopback_disable = 1;
                        break;
 
+               case 'R':
+                       rtr_frame = 1;
+                       break;
+
                case 'p':
                        polltimeout = strtoul(optarg, NULL, 10);
                        break;
@@ -268,6 +274,9 @@ int main(int argc, char **argv)
                        frame.can_id &= CAN_SFF_MASK;
        }
 
+       if (rtr_frame)
+               frame.can_id |= CAN_RTR_FLAG;
+
        if (extended)
                frame.can_id |=  CAN_EFF_FLAG;