Add functionality to

terminate after receiption of <count> CAN frames.

diff --git a/candump.c b/candump.c
index cbe821e1fc7ccac90dce24573aa5cd852d71bdae..a106bfd577d563832079ec121090f2ccd38045d5 100644 (file)
--- a/candump.c
+++ b/candump.c
@@ -115,6 +115,7 @@ void print_usage(char *prg)
        fprintf(stderr, "         -B <can>    (bridge mode - like '-b' with disabled loopback)\n");
        fprintf(stderr, "         -l          (log CAN-frames into file. Sets '-s %d' by default)\n", SILENT_ON);
        fprintf(stderr, "         -L          (use log file format on stdout)\n");
+       fprintf(stderr, "         -n <count>  (terminate after receiption of <count> CAN frames)\n");
        fprintf(stderr, "\n");
        fprintf(stderr, "Up to %d CAN interfaces with optional filter sets can be specified\n", MAXSOCK);
        fprintf(stderr, "on the commandline in the form: <ifname>[,filter]*\n");
@@ -202,6 +203,7 @@ int main(int argc, char **argv)
        unsigned char view = 0;
        unsigned char log = 0;
        unsigned char logfrmt = 0;
+       int count = 0;
        int opt, ret;
        int currmax, numfilter;
        char *ptr, *nptr;
@@ -221,7 +223,7 @@ int main(int argc, char **argv)
        last_tv.tv_sec  = 0;
        last_tv.tv_usec = 0;
 
-       while ((opt = getopt(argc, argv, "t:ciaSs:b:B:lLh?")) != -1) {
+       while ((opt = getopt(argc, argv, "t:ciaSs:b:B:lLn:h?")) != -1) {
                switch (opt) {
                case 't':
                        timestamp = optarg[0];
@@ -304,6 +306,14 @@ int main(int argc, char **argv)
                        logfrmt = 1;
                        break;
 
+               case 'n':
+                       count = atoi(optarg);
+                       if (count < 1) {
+                               print_usage(basename(argv[0]));
+                               exit(1);
+                       }
+                       break;
+
                default:
                        print_usage(basename(argv[0]));
                        exit(1);
@@ -500,6 +510,9 @@ int main(int argc, char **argv)
                                        return 1;
                                }
 
+                               if (count && (--count == 0))
+                                       running = 0;
+
                                if (bridge) {
                                        nbytes = write(bridge, &frame, sizeof(struct can_frame));
                                        if (nbytes < 0) {