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Use timespec #592

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76b5891
Use timespec
RikusW Mar 10, 2025
71e8c16
Optional nanosecond timestamp logging
RikusW Mar 11, 2025
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86 changes: 56 additions & 30 deletions candump.c
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Original file line number Diff line number Diff line change
Expand Up @@ -128,6 +128,7 @@ static void print_usage(void)
fprintf(stderr, "Options:\n");
fprintf(stderr, " -t <type> (timestamp: (a)bsolute/(d)elta/(z)ero/(A)bsolute w date)\n");
fprintf(stderr, " -H (read hardware timestamps instead of system timestamps)\n");
fprintf(stderr, " -N (log nanosecond timestamps instead of microseconds)\n");
fprintf(stderr, " -c (increment color mode level)\n");
fprintf(stderr, " -i (binary output - may exceed 80 chars/line)\n");
fprintf(stderr, " -a (enable additional ASCII output)\n");
Expand Down Expand Up @@ -220,49 +221,66 @@ static int idx2dindex(int ifidx, int socket)
return i;
}

static int sprint_timestamp(char *ts_buffer, const char timestamp,
const struct timeval *tv, struct timeval *const last_tv)
static int sprint_timestamp(char *ts_buffer, const char timestamp, unsigned char use_ns,
const struct timespec *ts, struct timespec *const last_ts)
{
int numchars = 0;

switch (timestamp) {
case 'a': /* absolute with timestamp */
numchars = sprintf(ts_buffer, "(%010llu.%06llu) ",
(unsigned long long)tv->tv_sec,
(unsigned long long)tv->tv_usec);
if (use_ns) {
numchars = sprintf(ts_buffer, "(%010llu.%09llu) ",
(unsigned long long)ts->tv_sec,
(unsigned long long)ts->tv_nsec);
} else {
numchars = sprintf(ts_buffer, "(%010llu.%06llu) ",
(unsigned long long)ts->tv_sec,
(unsigned long long)ts->tv_nsec / 1000);
}
break;

case 'A': /* absolute with date */
{
struct tm tm;
char timestring[25];

tm = *localtime(&tv->tv_sec);
tm = *localtime(&ts->tv_sec);
strftime(timestring, 24, "%Y-%m-%d %H:%M:%S", &tm);
numchars = sprintf(ts_buffer, "(%s.%06llu) ", timestring,
(unsigned long long)tv->tv_usec);
if (use_ns) {
numchars = sprintf(ts_buffer, "(%s.%09llu) ", timestring,
(unsigned long long)ts->tv_nsec);
} else {
numchars = sprintf(ts_buffer, "(%s.%06llu) ", timestring,
(unsigned long long)ts->tv_nsec / 1000);
}
}
break;

case 'd': /* delta */
case 'z': /* starting with zero */
{
struct timeval diff;

if (last_tv->tv_sec == 0) /* first init */
*last_tv = *tv;
diff.tv_sec = tv->tv_sec - last_tv->tv_sec;
diff.tv_usec = tv->tv_usec - last_tv->tv_usec;
if (diff.tv_usec < 0)
diff.tv_sec--, diff.tv_usec += 1000000;
struct timespec diff;

if (last_ts->tv_sec == 0) /* first init */
*last_ts = *ts;
diff.tv_sec = ts->tv_sec - last_ts->tv_sec;
diff.tv_nsec = ts->tv_nsec - last_ts->tv_nsec;
if (diff.tv_nsec < 0)
diff.tv_sec--, diff.tv_nsec += 1000000000;
if (diff.tv_sec < 0)
diff.tv_sec = diff.tv_usec = 0;
numchars = sprintf(ts_buffer, "(%03llu.%06llu) ",
(unsigned long long)diff.tv_sec,
(unsigned long long)diff.tv_usec);
diff.tv_sec = diff.tv_nsec = 0;
if (use_ns) {
numchars = sprintf(ts_buffer, "(%03llu.%09llu) ",
(unsigned long long)diff.tv_sec,
(unsigned long long)diff.tv_nsec);
} else {
numchars = sprintf(ts_buffer, "(%03llu.%06llu) ",
(unsigned long long)diff.tv_sec,
(unsigned long long)diff.tv_nsec / 1000);
}

if (timestamp == 'd')
*last_tv = *tv; /* update for delta calculation */
*last_ts = *ts; /* update for delta calculation */
}
break;

Expand All @@ -288,6 +306,7 @@ int main(int argc, char **argv)
unsigned char timestamp = 0;
unsigned char logtimestamp = 'a';
unsigned char hwtimestamp = 0;
unsigned char use_ns = 0;
unsigned char down_causes_exit = 1;
unsigned char dropmonitor = 0;
unsigned char extra_msg_info = 0;
Expand Down Expand Up @@ -322,7 +341,7 @@ int main(int argc, char **argv)
static cu_t cu; /* union for CAN CC/FD/XL frames */
int nbytes, i;
struct ifreq ifr;
struct timeval tv, last_tv;
struct timespec ts, last_ts;
int timeout_ms = -1; /* default to no timeout */
FILE *logfile = NULL;
char fname[83]; /* suggested by -Wformat-overflow= */
Expand All @@ -334,12 +353,12 @@ int main(int argc, char **argv)
signal(SIGHUP, sigterm);
signal(SIGINT, sigterm);

last_tv.tv_sec = 0;
last_tv.tv_usec = 0;
last_ts.tv_sec = 0;
last_ts.tv_nsec = 0;

progname = basename(argv[0]);

while ((opt = getopt(argc, argv, "t:HciaSs:lf:Ln:r:Dde8xT:h?")) != -1) {
while ((opt = getopt(argc, argv, "t:HNciaSs:lf:Ln:r:Dde8xT:h?")) != -1) {
switch (opt) {
case 't':
timestamp = optarg[0];
Expand All @@ -359,6 +378,10 @@ int main(int argc, char **argv)
hwtimestamp = 1;
break;

case 'N':
use_ns = 1;
break;

case 'c':
color++;
break;
Expand Down Expand Up @@ -784,7 +807,11 @@ int main(int argc, char **argv)
cmsg && (cmsg->cmsg_level == SOL_SOCKET);
cmsg = CMSG_NXTHDR(&msg,cmsg)) {
if (cmsg->cmsg_type == SO_TIMESTAMP) {
struct timeval tv;
memcpy(&tv, CMSG_DATA(cmsg), sizeof(tv));
ts.tv_sec = tv.tv_sec;
ts.tv_nsec = tv.tv_usec;
ts.tv_nsec *= 1000;
} else if (cmsg->cmsg_type == SO_TIMESTAMPING) {
struct timespec *stamp = (struct timespec *)CMSG_DATA(cmsg);

Expand All @@ -795,8 +822,7 @@ int main(int argc, char **argv)
* See chapter 2.1.2 Receive timestamps in
* linux/Documentation/networking/timestamping.txt
*/
tv.tv_sec = stamp[2].tv_sec;
tv.tv_usec = stamp[2].tv_nsec / 1000;
ts = stamp[2];
} else if (cmsg->cmsg_type == SO_RXQ_OVFL) {
memcpy(&obj->dropcnt, CMSG_DATA(cmsg), sizeof(__u32));
}
Expand Down Expand Up @@ -831,8 +857,8 @@ int main(int argc, char **argv)
/* build common log format output */
if ((log) || ((logfrmt) && (silent == SILENT_OFF))) {

alen = sprint_timestamp(afrbuf, logtimestamp,
&tv, &last_tv);
alen = sprint_timestamp(afrbuf, logtimestamp, use_ns,
&ts, &last_ts);

alen += sprintf(afrbuf + alen, "%*s ",
max_devname_len, devname[idx]);
Expand Down Expand Up @@ -861,7 +887,7 @@ int main(int argc, char **argv)

/* print (colored) long CAN frame style to stdout */
alen = sprintf(afrbuf, " %s", (color > 2) ? col_on[idx % MAXCOL] : "");
alen += sprint_timestamp(afrbuf + alen, timestamp, &tv, &last_tv);
alen += sprint_timestamp(afrbuf + alen, timestamp, use_ns, &ts, &last_ts);
alen += sprintf(afrbuf + alen, " %s%*s",
(color && (color < 3)) ? col_on[idx % MAXCOL] : "",
max_devname_len, devname[idx]);
Expand Down