Index: lib/libc/gen/readdir.c
===================================================================
RCS file: /cvsroot/src/lib/libc/gen/readdir.c,v
retrieving revision 1.26
diff -p -u -r1.26 readdir.c
--- lib/libc/gen/readdir.c	25 Jun 2012 22:32:43 -0000	1.26
+++ lib/libc/gen/readdir.c	31 Aug 2024 14:55:42 -0000
@@ -91,7 +91,10 @@ struct dirent *
 readdir(DIR *dirp)
 {
 	struct dirent	*dp;
+	int saved_errno;
 
+	saved_errno = errno;
+	errno = 0;
 #ifdef _REENTRANT
 	if (__isthreaded) {
 		mutex_lock((mutex_t *)dirp->dd_lock);
@@ -101,6 +104,10 @@ readdir(DIR *dirp)
 	else
 #endif
 		dp = _readdir_unlocked(dirp, 1);
+
+	if (errno == 0 && dp == NULL)
+		errno = saved_errno;
+
 	return (dp);
 }