slcan_attach: added '-f' commandline option to read status flags.

[sojka/can-utils.git] / slcan_attach.c

diff --git a/slcan_attach.c b/slcan_attach.c
index 147ec6b0b795b54d4fc17e47c47c3d2e040fc36b..89366be014ee38a397d171a1fc84f6d89ad40a02 100644 (file)
--- a/slcan_attach.c
+++ b/slcan_attach.c
@@ -61,13 +61,14 @@ void print_usage(char *prg)
        fprintf(stderr, "\nUsage: %s [options] tty\n\n", prg);
        fprintf(stderr, "Options: -o         (send open command 'O\\r')\n");
        fprintf(stderr, "         -c         (send close command 'C\\r')\n");
+       fprintf(stderr, "         -f         (read status flags with 'F\\r' to reset error states)\n");
        fprintf(stderr, "         -s <speed> (set CAN speed 0..8)\n");
        fprintf(stderr, "         -b <btr>   (set bit time register value)\n");
        fprintf(stderr, "         -d         (only detach line discipline)\n");
        fprintf(stderr, "         -w         (attach - wait for keypess - detach)\n");
        fprintf(stderr, "         -n <name>  (assign created netdevice name)\n");
        fprintf(stderr, "\nExamples:\n");
-       fprintf(stderr, "slcan_attach -w -o -s6 -c /dev/ttyS1\n");
+       fprintf(stderr, "slcan_attach -w -o -f -s6 -c /dev/ttyS1\n");
        fprintf(stderr, "slcan_attach /dev/ttyS1\n");
        fprintf(stderr, "slcan_attach -d /dev/ttyS1\n");
        fprintf(stderr, "slcan_attach -w -n can15 /dev/ttyS1\n");
@@ -83,6 +84,7 @@ int main(int argc, char **argv)
        int waitkey = 0;
        int send_open = 0;
        int send_close = 0;
+       int send_read_status_flags = 0;
        char *speed = NULL;
        char *btr = NULL;
        char buf[IFNAMSIZ+1];
@@ -90,7 +92,7 @@ int main(int argc, char **argv)
        char *name = NULL;
        int opt;
 
-       while ((opt = getopt(argc, argv, "l:dwocs:b:n:?")) != -1) {
+       while ((opt = getopt(argc, argv, "l:dwocfs:b:n:?")) != -1) {
                switch (opt) {
                case 'l':
                        fprintf(stderr, "Ignored option '-l'\n");
@@ -112,6 +114,10 @@ int main(int argc, char **argv)
                        send_close = 1;
                        break;
 
+               case 'f':
+                       send_read_status_flags = 1;
+                       break;
+
                case 's':
                        speed = optarg;
                        if (strlen(speed) > 1)
@@ -159,6 +165,11 @@ int main(int argc, char **argv)
                        write(fd, buf, strlen(buf));
                }
 
+               if (send_read_status_flags) {
+                       sprintf(buf, "F\r");
+                       write(fd, buf, strlen(buf));
+               }
+
                if (send_open) {
                        sprintf(buf, "O\r");
                        write(fd, buf, strlen(buf));