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candump: Use SCM_* consts instead of SO_* for cmsg_type

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There are explicit #defines for SCM_TIMESTAMP and SCM_TIMESTAMPING. They
currently happen to have the same value as SO_TIMESTAMP and
SO_TIMESTAMPING but the former should be used when checking cmsg_type in
case one day they do not.
This commit is contained in:
Darcy Phipps
2025-12-05 09:35:50 -05:00
parent 374fecde09
commit 65e715d56d
1 changed files with 5 additions and 2 deletions
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candump.c
+5 -2
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@@ -72,6 +72,9 @@
#ifndef SO_TIMESTAMPING
#define SO_TIMESTAMPING 37
#endif
#ifndef SCM_TIMESTAMPING
#define SCM_TIMESTAMPING SO_TIMESTAMPING
#endif
#define TIMESTAMPSZ 50 /* string 'absolute with date' requires max 49 bytes */
@@ -807,13 +810,13 @@ int main(int argc, char **argv)
for (cmsg = CMSG_FIRSTHDR(&msg);
cmsg && (cmsg->cmsg_level == SOL_SOCKET);
cmsg = CMSG_NXTHDR(&msg,cmsg)) {
if (cmsg->cmsg_type == SO_TIMESTAMP) {
if (cmsg->cmsg_type == SCM_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) {
} else if (cmsg->cmsg_type == SCM_TIMESTAMPING) {
struct timespec *stamp = (struct timespec *)CMSG_DATA(cmsg);
/*