Squashed 'third_party/elfutils/' content from commit 555e15e
Change-Id: I61cde98949e47e5c8c09c33260de17f30921be79
git-subtree-dir: third_party/elfutils
git-subtree-split: 555e15ebe8bf1eb33d00747173cfc80cc65648a4
diff --git a/libelf/elf_clone.c b/libelf/elf_clone.c
new file mode 100644
index 0000000..e6fe472
--- /dev/null
+++ b/libelf/elf_clone.c
@@ -0,0 +1,81 @@
+/* Create clone of a given descriptor.
+ Copyright (C) 2003, 2004 Red Hat, Inc.
+ This file is part of elfutils.
+ Written by Ulrich Drepper <drepper@redhat.com>, 2003.
+
+ This file is free software; you can redistribute it and/or modify
+ it under the terms of either
+
+ * the GNU Lesser General Public License as published by the Free
+ Software Foundation; either version 3 of the License, or (at
+ your option) any later version
+
+ or
+
+ * the GNU General Public License as published by the Free
+ Software Foundation; either version 2 of the License, or (at
+ your option) any later version
+
+ or both in parallel, as here.
+
+ elfutils is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received copies of the GNU General Public License and
+ the GNU Lesser General Public License along with this program. If
+ not, see <http://www.gnu.org/licenses/>. */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <assert.h>
+#include <stddef.h>
+#include "libelfP.h"
+#include "common.h"
+
+
+Elf *
+elf_clone (Elf *elf, Elf_Cmd cmd)
+{
+ Elf *retval = NULL;
+
+ if (elf == NULL)
+ /* Some earlier mistake. */
+ return NULL;
+
+ /* Make sure the descriptor is not suddenly going away. */
+ rwlock_rdlock (elf->lock);
+
+ if (cmd != ELF_C_EMPTY)
+ // XXX TODO handle ELF_C_READ/WRITE etc
+ goto out;
+
+ retval = allocate_elf (elf->fildes, elf->map_address, elf->start_offset,
+ elf->maximum_size, elf->cmd, elf->parent, elf->kind,
+ elf->state.elf32.scns.max * sizeof (Elf_Scn));
+ if (retval != NULL)
+ {
+ /* We have to write to the file in any case. */
+ retval->flags = ELF_F_DIRTY;
+
+ /* Some more or less arbitrary value. */
+ retval->state.elf.scnincr = 10;
+
+ /* We have allocated room for some sections. */
+ assert (offsetof (struct Elf, state.elf32.scns)
+ == offsetof (struct Elf, state.elf64.scns));
+ retval->state.elf.scns_last = &retval->state.elf32.scns;
+ retval->state.elf32.scns.max = elf->state.elf32.scns.max;
+
+ retval->class = elf->class;
+ }
+
+ /* Release the lock. */
+ out:
+ rwlock_unlock (elf->lock);
+
+ return retval;
+}