From 7d2f0196813bd6ea046a2fd6a8623baee3f58db0 Mon Sep 17 00:00:00 2001
From: Johannes Schlatow <johannes.schlatow@genode-labs.com>
Date: Fri, 15 Jul 2022 11:09:45 +0200
Subject: [PATCH] libc: output warning if RTC is not present

genodelabs/genode#4561
---
 repos/libports/src/lib/libc/time.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/repos/libports/src/lib/libc/time.cc b/repos/libports/src/lib/libc/time.cc
index 0ec663caa4..a6168111ff 100644
--- a/repos/libports/src/lib/libc/time.cc
+++ b/repos/libports/src/lib/libc/time.cc
@@ -78,8 +78,10 @@ int clock_gettime(clockid_t clk_id, struct timespec *ts)
 		if (!_current_real_time_ptr)
 			throw Missing_call_of_init_time();
 
-		if (!_current_real_time_ptr->has_real_time())
+		if (!_current_real_time_ptr->has_real_time()) {
+			warning("clock_gettime(): missing real-time clock");
 			return Errno(EINVAL);
+		}
 
 		*ts = _current_real_time_ptr->current_real_time();
 		break;