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_cntl.c b/libelf/elf_cntl.c
new file mode 100644
index 0000000..fd68178
--- /dev/null
+++ b/libelf/elf_cntl.c
@@ -0,0 +1,81 @@
+/* Control an ELF file desrciptor.
+ Copyright (C) 1998, 1999, 2000, 2002, 2015 Red Hat, Inc.
+ This file is part of elfutils.
+ Written by Ulrich Drepper <drepper@redhat.com>, 1998.
+
+ 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 <unistd.h>
+
+#include "libelfP.h"
+
+
+int
+elf_cntl (Elf *elf, Elf_Cmd cmd)
+{
+ int result = 0;
+
+ if (elf == NULL)
+ return -1;
+
+ if (elf->fildes == -1)
+ {
+ __libelf_seterrno (ELF_E_INVALID_HANDLE);
+ return -1;
+ }
+
+ rwlock_wrlock (elf->lock);
+
+ switch (cmd)
+ {
+ case ELF_C_FDREAD:
+ /* If not all of the file is in the memory read it now. */
+ if (elf->map_address == NULL && __libelf_readall (elf) == NULL)
+ {
+ /* We were not able to read everything. */
+ result = -1;
+ break;
+ }
+ FALLTHROUGH;
+
+ case ELF_C_FDDONE:
+ /* Mark the file descriptor as not usable. */
+ elf->fildes = -1;
+ break;
+
+ default:
+ __libelf_seterrno (ELF_E_INVALID_CMD);
+ result = -1;
+ break;
+ }
+
+ rwlock_unlock (elf->lock);
+
+ return result;
+}