1 files changed, 35 insertions, 0 deletions
diff --git a/libc/misc/dirent/telldir.c b/libc/misc/dirent/telldir.c
new file mode 100644
index 000000000..33e163aba
--- /dev/null
+++ b/libc/misc/dirent/telldir.c
@@ -0,0 +1,35 @@
+#include <errno.h>
+#include <unistd.h>
+#include "dirstream.h"
+
+
+off_t telldir(DIR * dir)
+{
+	off_t offset;
+
+	if (!dir) {
+		errno = EBADF;
+		return -1;
+	}
+
+	switch (dir->dd_getdents) {
+	case no_getdents:
+		/* We are running the old kernel. This is the starting offset
+		   of the next readdir(). */
+		offset = lseek(dir->dd_fd, 0, SEEK_CUR);
+		break;
+
+	case unknown:
+		/* readdir () is not called yet. but seekdir () may be called. */
+	case have_getdents:
+		/* The next entry. */
+		offset = dir->dd_nextoff;
+		break;
+
+	default:
+		errno = EBADF;
+		offset = -1;
+	}
+
+	return offset;
+}