Adjust for monotone.
diff --git a/libdw/dwarf_getsrcfiles.c b/libdw/dwarf_getsrcfiles.c
new file mode 100644
index 0000000..6472bf4
--- /dev/null
+++ b/libdw/dwarf_getsrcfiles.c
@@ -0,0 +1,60 @@
+/* Return source file information of CU.
+ Copyright (C) 2004, 2005 Red Hat, Inc.
+ Written by Ulrich Drepper <drepper@redhat.com>, 2004.
+
+ This program is Open Source software; you can redistribute it and/or
+ modify it under the terms of the Open Software License version 1.0 as
+ published by the Open Source Initiative.
+
+ You should have received a copy of the Open Software License along
+ with this program; if not, you may obtain a copy of the Open Software
+ License version 1.0 from http://www.opensource.org/licenses/osl.php or
+ by writing the Open Source Initiative c/o Lawrence Rosen, Esq.,
+ 3001 King Ranch Road, Ukiah, CA 95482. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <assert.h>
+#include <dwarf.h>
+#include "libdwP.h"
+
+
+int
+dwarf_getsrcfiles (Dwarf_Die *cudie, Dwarf_Files **files, size_t *nfiles)
+{
+ if (unlikely (cudie == NULL
+ || INTUSE(dwarf_tag) (cudie) != DW_TAG_compile_unit))
+ return -1;
+
+ int res = -1;
+
+ /* Get the information if it is not already known. */
+ struct Dwarf_CU *const cu = cudie->cu;
+ if (cu->lines == NULL)
+ {
+ Dwarf_Lines *lines;
+ size_t nlines;
+
+ /* Let the more generic function do the work. It'll create more
+ data but that will be needed in an real program anyway. */
+ res = INTUSE(dwarf_getsrclines) (cudie, &lines, &nlines);
+ }
+ else if (cu->files != (void *) -1l)
+ /* We already have the information. */
+ res = 0;
+
+ if (likely (res == 0))
+ {
+ assert (cu->files != NULL && cu->files != (void *) -1l);
+ *files = cu->files;
+ if (nfiles != NULL)
+ *nfiles = cu->files->nfiles;
+ }
+
+ // XXX Eventually: unlocking here.
+
+ return res;
+}
+INTDEF (dwarf_getsrcfiles)