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-rw-r--r--src/stdio/ferror.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/src/stdio/ferror.c b/src/stdio/ferror.c
index 8288a93d..d692eed9 100644
--- a/src/stdio/ferror.c
+++ b/src/stdio/ferror.c
@@ -4,7 +4,10 @@
 
 int ferror(FILE *f)
 {
-	return !!(f->flags & F_ERR);
+	FLOCK(f);
+	int ret = !!(f->flags & F_ERR);
+	FUNLOCK(f);
+	return ret;
 }
 
 weak_alias(ferror, ferror_unlocked);