From: Andrei Tatar <andrei@unikraft.io>
Date: Tue, 7 Nov 2023 14:06:48 +0000 (+0100)
Subject: lib/posix-time: Allow NULL arg in clock_getres
X-Git-Tag: RELEASE-0.16.0~205
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=7153f4aa4aecaacd674a1315a2b2613fd4ac456f;p=unikraft%2Funikraft.git

lib/posix-time: Allow NULL arg in clock_getres

This change fixes the behavior of clock_getres to not return an error
when receiving a NULL as its output argument, in accordance with docs.

Signed-off-by: Andrei Tatar <andrei@unikraft.io>
Reviewed-by: Simon Kuenzer <simon@unikraft.io>
Approved-by: Simon Kuenzer <simon@unikraft.io>
GitHub-Closes: #1154
---

diff --git a/lib/posix-time/time.c b/lib/posix-time/time.c
index a34ef4781..fbbd5c79a 100644
--- a/lib/posix-time/time.c
+++ b/lib/posix-time/time.c
@@ -149,17 +149,14 @@ UK_SYSCALL_R_DEFINE(int, clock_getres, clockid_t, clk_id,
 {
 	int error;
 
-	if (!tp) {
-		error = EFAULT;
-		goto out_error;
-	}
-
 	switch (clk_id) {
 	case CLOCK_MONOTONIC:
 	case CLOCK_MONOTONIC_COARSE:
 	case CLOCK_REALTIME:
-		tp->tv_sec = 0;
-		tp->tv_nsec = UKPLAT_TIME_TICK_NSEC;
+		if (tp) {
+			tp->tv_sec = 0;
+			tp->tv_nsec = UKPLAT_TIME_TICK_NSEC;
+		}
 		break;
 	default:
 		error = EINVAL;