[musl] [PATCH] dns: Prefer monotonic clock for DNS lookup timeouts

["A. Wilcox" <AWilcox@Wilcox-Tech.com>]

Before this commit, DNS timeouts always used CLOCK_REALTIME, which could
produce errors 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;
 }
-- 
2.37.1 (Apple Git-137.1)