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socket: enable nanosecond resolution RX timestamp on FreeBSD

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FreeBSD allows switching the receive timestamp format to struct timespec by
setting the SO_TS_CLOCK socket option to SO_TS_REALTIME after enabling
SO_TIMESTAMP.  If successful, the kernel then starts adding SCM_REALTIME
control messages instead of SCM_TIMESTAMP.
This commit is contained in:
Josef 'Jeff' Sipek 2023-08-09 07:58:38 -04:00 committed by Miroslav Lichvar
parent e48a34392c
commit 8caaa0b056
1 changed files with 13 additions and 1 deletions
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14
socket.c
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@ -869,6 +869,11 @@ process_header(struct msghdr *msg, int msg_length, int sock_fd, int flags,
memcpy(&message->timestamp.kernel, CMSG_DATA(cmsg), sizeof (message->timestamp.kernel));
}
#endif
#ifdef SCM_REALTIME
else if (match_cmsg(cmsg, SOL_SOCKET, SCM_REALTIME, sizeof (message->timestamp.kernel))) {
memcpy(&message->timestamp.kernel, CMSG_DATA(cmsg), sizeof (message->timestamp.kernel));
}
#endif
#ifdef HAVE_LINUX_TIMESTAMPING
#ifdef HAVE_LINUX_TIMESTAMPING_OPT_PKTINFO
else if (match_cmsg(cmsg, SOL_SOCKET, SCM_TIMESTAMPING_PKTINFO,
@ -1386,8 +1391,15 @@ SCK_EnableKernelRxTimestamping(int sock_fd)
return 1;
#endif
#ifdef SO_TIMESTAMP
if (SCK_SetIntOption(sock_fd, SOL_SOCKET, SO_TIMESTAMP, 1))
if (SCK_SetIntOption(sock_fd, SOL_SOCKET, SO_TIMESTAMP, 1)) {
#if defined(SO_TS_CLOCK) && defined(SO_TS_REALTIME)
/* We don't care about the return value - we'll get either a
SCM_REALTIME (if we succeded) or a SCM_TIMESTAMP (if we failed) */
if (!SCK_SetIntOption(sock_fd, SOL_SOCKET, SO_TS_CLOCK, SO_TS_REALTIME))
;
#endif
return 1;
}
#endif
return 0;