From 7d756e1c04de6eb3f2b3d3e1141a218bb329fcfb Mon Sep 17 00:00:00 2001 From: "A. Wilcox" Date: Thu, 29 Dec 2022 21:21:32 -0600 Subject: dns: prefer monotonic clock for timeouts Before this commit, DNS timeouts always used CLOCK_REALTIME, which could produce spurious timeouts or delays if wall time changed for whatever reason. Now we try CLOCK_MONOTONIC and only fall back to CLOCK_REALTIME when it is unavailable. --- src/network/res_msend.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/src/network/res_msend.c b/src/network/res_msend.c index 11c6aa0e..fef7e3a2 100644 --- a/src/network/res_msend.c +++ b/src/network/res_msend.c @@ -25,7 +25,8 @@ static void cleanup(void *p) static unsigned long mtime() { struct timespec ts; - clock_gettime(CLOCK_REALTIME, &ts); + if (clock_gettime(CLOCK_MONOTONIC, &ts) < 0 && errno == ENOSYS) + clock_gettime(CLOCK_REALTIME, &ts); return (unsigned long)ts.tv_sec * 1000 + ts.tv_nsec / 1000000; } -- cgit v1.2.1