4 * Copyright (c) 2002-2008 Volkswagen Group Electronic Research
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8 * modification, are permitted provided that the following conditions
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16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * Alternatively, provided that this notice is retained in full, this
20 * software may be distributed under the terms of the GNU General
21 * Public License ("GPL") version 2, in which case the provisions of the
22 * GPL apply INSTEAD OF those given above.
24 * The provided data structures and external interfaces from this code
25 * are not restricted to be used by modules with a GPL compatible license.
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40 * Send feedback to <linux-can@vger.kernel.org>
54 #include <sys/types.h>
55 #include <sys/socket.h>
56 #include <sys/ioctl.h>
60 #include <linux/can.h>
61 #include <linux/can/raw.h>
64 #include "canframelen.h"
66 #define MAXSOCK 16 /* max. number of CAN interfaces given on the cmdline */
68 #define PERCENTRES 5 /* resolution in percent for bargraph */
69 #define NUMBAR (100/PERCENTRES) /* number of bargraph elements */
71 extern int optind, opterr, optopt;
74 char devname[IFNAMSIZ+1];
76 unsigned int recv_frames;
77 unsigned int recv_bits_total;
78 unsigned int recv_bits_payload;
81 static int max_devname_len; /* to prevent frazzled device name output */
82 static int max_bitrate_len;
84 static unsigned char redraw;
85 static unsigned char timestamp;
86 static unsigned char color;
87 static unsigned char bargraph;
88 static enum cfl_mode mode = CFL_WORSTCASE;
91 void print_usage(char *prg)
93 fprintf(stderr, "\nUsage: %s [options] <CAN interface>+\n", prg);
94 fprintf(stderr, " (use CTRL-C to terminate %s)\n\n", prg);
95 fprintf(stderr, "Options: -t (show current time on the first line)\n");
96 fprintf(stderr, " -c (colorize lines)\n");
97 fprintf(stderr, " -b (show bargraph in %d%% resolution)\n", PERCENTRES);
98 fprintf(stderr, " -r (redraw the terminal - similar to top)\n");
99 fprintf(stderr, " -i (ignore bitstuffing in bandwidth calculation)\n");
100 fprintf(stderr, " -e (exact calculation of stuffed bits)\n");
101 fprintf(stderr, "\n");
102 fprintf(stderr, "Up to %d CAN interfaces with mandatory bitrate can be specified on the \n", MAXSOCK);
103 fprintf(stderr, "commandline in the form: <ifname>@<bitrate>\n\n");
104 fprintf(stderr, "The bitrate is mandatory as it is needed to know the CAN bus bitrate to\n");
105 fprintf(stderr, "calcultate the bus load percentage based on the received CAN frames.\n");
106 fprintf(stderr, "Due to the bitstuffing estimation the calculated busload may exceed 100%%.\n");
107 fprintf(stderr, "For each given interface the data is presented in one line which contains:\n\n");
108 fprintf(stderr, "(interface) (received CAN frames) (used bits total) (used bits for payload)\n");
109 fprintf(stderr, "\nExample:\n");
110 fprintf(stderr, "\nuser$> canbusload can0@100000 can1@500000 can2@500000 can3@500000 -r -t -b -c\n\n");
111 fprintf(stderr, "%s 2008-05-27 15:18:49\n", prg);
112 fprintf(stderr, " can0@100000 805 74491 36656 74%% |XXXXXXXXXXXXXX......|\n");
113 fprintf(stderr, " can1@500000 796 75140 37728 15%% |XXX.................|\n");
114 fprintf(stderr, " can2@500000 0 0 0 0%% |....................|\n");
115 fprintf(stderr, " can3@500000 47 4633 2424 0%% |....................|\n");
116 fprintf(stderr, "\n");
119 void sigterm(int signo)
124 void printstats(int signo)
129 printf("%s", CSR_HOME);
135 if (time(&currtime) == (time_t)-1) {
140 localtime_r(&currtime, &now);
142 printf("%s %04d-%02d-%02d %02d:%02d:%02d\n",
152 for (i=0; i<currmax; i++) {
158 printf("%s", FGBLUE);
162 percent = (stat[i].recv_bits_total*100)/stat[i].bitrate;
166 printf(" %*s@%-*d %5d %7d %6d %3d%%",
167 max_devname_len, stat[i].devname,
168 max_bitrate_len, stat[i].bitrate,
170 stat[i].recv_bits_total,
171 stat[i].recv_bits_payload,
181 for (j=0; j < NUMBAR; j++){
182 if (j < percent/PERCENTRES)
192 printf("%s", ATTRESET);
196 stat[i].recv_frames = 0;
197 stat[i].recv_bits_total = 0;
198 stat[i].recv_bits_payload = 0;
207 int main(int argc, char **argv)
214 struct sockaddr_can addr;
215 struct can_frame frame;
218 sigset_t sigmask, savesigmask;
220 signal(SIGTERM, sigterm);
221 signal(SIGHUP, sigterm);
222 signal(SIGINT, sigterm);
224 signal(SIGALRM, printstats);
226 prg = basename(argv[0]);
228 while ((opt = getopt(argc, argv, "rtbcieh?")) != -1) {
247 mode = CFL_NO_BITSTUFFING;
261 if (optind == argc) {
266 currmax = argc - optind; /* find real number of CAN devices */
268 if (currmax > MAXSOCK) {
269 printf("More than %d CAN devices given on commandline!\n", MAXSOCK);
273 for (i=0; i < currmax; i++) {
275 ptr = argv[optind+i];
277 nbytes = strlen(ptr);
278 if (nbytes >= IFNAMSIZ+sizeof("@1000000")+1) {
279 printf("name of CAN device '%s' is too long!\n", ptr);
284 printf("open %d '%s'.\n", i, ptr);
287 s[i] = socket(PF_CAN, SOCK_RAW, CAN_RAW);
293 nptr = strchr(ptr, '@');
300 nbytes = nptr - ptr; /* interface name is up the first '@' */
302 if (nbytes >= IFNAMSIZ) {
303 printf("name of CAN device '%s' is too long!\n", ptr);
307 strncpy(stat[i].devname, ptr, nbytes);
308 memset(&ifr.ifr_name, 0, sizeof(ifr.ifr_name));
309 strncpy(ifr.ifr_name, ptr, nbytes);
311 if (nbytes > max_devname_len)
312 max_devname_len = nbytes; /* for nice printing */
314 stat[i].bitrate = atoi(nptr+1); /* bitrate is placed behind the '@' */
316 if (!stat[i].bitrate || stat[i].bitrate > 1000000) {
317 printf("invalid bitrate for CAN device '%s'!\n", ptr);
321 nbytes = strlen(nptr+1);
322 if (nbytes > max_bitrate_len)
323 max_bitrate_len = nbytes; /* for nice printing */
327 printf("using interface name '%s'.\n", ifr.ifr_name);
330 if (ioctl(s[i], SIOCGIFINDEX, &ifr) < 0) {
331 perror("SIOCGIFINDEX");
335 addr.can_family = AF_CAN;
336 addr.can_ifindex = ifr.ifr_ifindex;
338 if (bind(s[i], (struct sockaddr *)&addr, sizeof(addr)) < 0) {
347 printf("%s", CLR_SCREEN);
352 for (i=0; i<currmax; i++)
355 savesigmask = sigmask;
357 if (pselect(s[currmax-1]+1, &rdfs, NULL, NULL, NULL, &sigmask) < 0) {
359 sigmask = savesigmask;
363 for (i=0; i<currmax; i++) { /* check all CAN RAW sockets */
365 if (FD_ISSET(s[i], &rdfs)) {
367 nbytes = read(s[i], &frame, sizeof(struct can_frame));
374 if (nbytes < sizeof(struct can_frame)) {
375 fprintf(stderr, "read: incomplete CAN frame\n");
379 stat[i].recv_frames++;
380 stat[i].recv_bits_payload += frame.can_dlc*8;
381 stat[i].recv_bits_total += can_frame_length((struct canfd_frame*)&frame,
382 mode, sizeof(frame));
387 for (i=0; i<currmax; i++)