From 2be94e68e8aeb7955aba9a5e317414040b90e619 Mon Sep 17 00:00:00 2001
From: Ted Lyngmo <ted@lyncon.se>
Date: Fri, 3 May 2024 20:10:33 +0200
Subject: [PATCH] Log the real reason for why posix_fadvise failed (#430)

`reclaimFilePageCache` did not set `errno` but `rdbSaveInternal` which
is logging the error assumed it did. This makes sure `errno` is set.

Signed-off-by: Ted Lyngmo <ted@lyncon.se>
---
 src/util.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/util.c b/src/util.c
index 26d92b922..62d789be9 100644
--- a/src/util.c
+++ b/src/util.c
@@ -1138,7 +1138,10 @@ int fsyncFileDir(const char *filename) {
 int reclaimFilePageCache(int fd, size_t offset, size_t length) {
 #ifdef HAVE_FADVISE
     int ret = posix_fadvise(fd, offset, length, POSIX_FADV_DONTNEED);
-    if (ret) return -1;
+    if (ret) {
+        errno = ret;
+        return -1;
+    }
     return 0;
 #else
     UNUSED(fd);