Added -f option to filter only on the CAN-ID and not on the content.

This can be useful when the timestamp cyle needs to be displayed.

diff --git a/cansniffer.c b/cansniffer.c
index c2b5930..bedaf5c 100644 (file)
--- a/cansniffer.c
+++ b/cansniffer.c
@@ -118,13 +118,14 @@ extern int optind, opterr, optopt;
 
 static int running = 1;
 static int clearscreen = 1;
-static int notch = 0;
+static int notch;
+static int filter_id_only;
 static long timeout = TIMEOUT;
 static long hold = HOLD;
 static long loop = LOOP;
-static unsigned char binary = 0;
-static unsigned char binary_gap = 0;
-static unsigned char color  = 0;
+static unsigned char binary;
+static unsigned char binary_gap;
+static unsigned char color;
 
 void rx_setup (int fd, int id);
 void rx_delete (int fd, int id);
@@ -195,7 +196,6 @@ int main(int argc, char **argv)
        long currcms = 0;
        long lastcms = 0;
        unsigned char quiet = 0;
-
        int opt, ret;
        struct timeval timeo, start_tv, tv;
        struct sockaddr_can addr;
@@ -210,7 +210,7 @@ int main(int argc, char **argv)
        for (i=0; i < 2048 ;i++) /* default: check all CAN-IDs */
                do_set(i, ENABLE);
 
-       while ((opt = getopt(argc, argv, "m:v:r:t:h:l:qbBc")) != -1) {
+       while ((opt = getopt(argc, argv, "m:v:r:t:h:l:qbBcf")) != -1) {
                switch (opt) {
                case 'm':
                        sscanf(optarg, "%x", &mask);
@@ -254,6 +254,10 @@ int main(int argc, char **argv)
                        color = 1;
                        break;
 
+               case 'f':
+                       filter_id_only = 1;
+                       break;
+
                case '?':
                        break;
 
@@ -371,6 +375,9 @@ void rx_setup (int fd, int id){
        txmsg.msg_head.nframes = 1;
        U64_DATA(&txmsg.frame) = (__u64) 0xFFFFFFFFFFFFFFFFULL;
 
+       if (filter_id_only)
+               txmsg.msg_head.flags |= RX_FILTER_ID;
+
        if (write(fd, &txmsg, sizeof(txmsg)) < 0)
                perror("write");
 };