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candump: make hardware timestamps Linux version agnostic 

Hardware timestamps have been introduced in Linux 2.6.30. Check for the
availability of SO_TIMESTAMPING and print an appropriate error message if
missing. Additionally fix some style issues and define the proper length
of ctrlmsg[].

Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
pull/62/head
Oliver Hartkopp 2017-12-06 10:16:09 +01:00
parent 7b8607ca89
commit 33640c8643
1 changed files with 27 additions and 15 deletions
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42
candump.c
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@ -58,7 +58,6 @@
#include <sys/ioctl.h>
#include <sys/uio.h>
#include <net/if.h>
#include <linux/net_tstamp.h>
#include <linux/can.h>
#include <linux/can/raw.h>
@ -66,6 +65,16 @@
#include "terminal.h"
#include "lib.h"
/* for hardware timestamps - since Linux 2.6.30 */
#ifndef SO_TIMESTAMPING
#define SO_TIMESTAMPING 37
#endif
/* from #include <linux/net_tstamp.h> - since Linux 2.6.30 */
#define SOF_TIMESTAMPING_SOFTWARE (1<<4)
#define SOF_TIMESTAMPING_RX_SOFTWARE (1<<3)
#define SOF_TIMESTAMPING_RAW_HARDWARE (1<<6)
#define MAXSOCK 16 /* max. number of CAN interfaces given on the cmdline */
#define MAXIFNAMES 30 /* size of receive name index to omit ioctls */
#define MAXCOL 6 /* number of different colors for colorized output */
@ -109,7 +118,7 @@ void print_usage(char *prg)
fprintf(stderr, "\nUsage: %s [options] <CAN interface>+\n", prg);
fprintf(stderr, " (use CTRL-C to terminate %s)\n\n", prg);
fprintf(stderr, "Options: -t <type> (timestamp: (a)bsolute/(d)elta/(z)ero/(A)bsolute w date)\n");
fprintf(stderr, " -H (Read hardware timestamps)\n");
fprintf(stderr, " -H (read hardware timestamps instead of system timestamps)\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");
@ -227,10 +236,7 @@ int main(int argc, char **argv)
int join_filter;
char *ptr, *nptr;
struct sockaddr_can addr;
struct {
struct cmsghdr cm;
char control[512];
} ctrlmsg;
char ctrlmsg[CMSG_SPACE(sizeof(struct timeval) + 3*sizeof(struct timespec) + sizeof(__u32))];
struct iovec iov;
struct msghdr msg;
struct cmsghdr *cmsg;
@ -565,18 +571,21 @@ int main(int argc, char **argv)
if (timestamp || log || logfrmt) {
int timestamping_flags = 1;
if (hwtimestamp) {
timestamping_flags = SOF_TIMESTAMPING_SOFTWARE | SOF_TIMESTAMPING_RX_SOFTWARE | \
SOF_TIMESTAMPING_RAW_HARDWARE;
const int timestamping_flags = (SOF_TIMESTAMPING_SOFTWARE | \
SOF_TIMESTAMPING_RX_SOFTWARE | \
SOF_TIMESTAMPING_RAW_HARDWARE);
if (setsockopt(s[i], SOL_SOCKET, SO_TIMESTAMPING,
&timestamping_flags, sizeof(timestamping_flags)) < 0) {
perror("setsockopt SO_TIMESTAMPING");
perror("setsockopt SO_TIMESTAMPING is not supported by your Linux kernel");
return 1;
}
} else {
const int timestamp_on = 1;
if (setsockopt(s[i], SOL_SOCKET, SO_TIMESTAMP,
&timestamping_flags, sizeof(timestamping_flags)) < 0) {
&timestamp_on, sizeof(timestamp_on)) < 0) {
perror("setsockopt SO_TIMESTAMP");
return 1;
}
@ -713,10 +722,13 @@ int main(int argc, char **argv)
struct timespec *stamp = (struct timespec *)CMSG_DATA(cmsg);
// stamp[0] is the software timestamp
// stamp[1] is deprecated
// stamp[2] is the raw hardware timestamp
// See 2.1.2 in doc/Documentation/networking/timestamping.txt
/*
* stamp[0] is the software timestamp
* stamp[1] is deprecated
* stamp[2] is the raw hardware timestamp
* 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;
} else if (cmsg->cmsg_type == SO_RXQ_OVFL)