Squashed 'third_party/elfutils/' content from commit 555e15e
Change-Id: I61cde98949e47e5c8c09c33260de17f30921be79
git-subtree-dir: third_party/elfutils
git-subtree-split: 555e15ebe8bf1eb33d00747173cfc80cc65648a4
diff --git a/libdw/dwarf_begin.c b/libdw/dwarf_begin.c
new file mode 100644
index 0000000..19d16e5
--- /dev/null
+++ b/libdw/dwarf_begin.c
@@ -0,0 +1,99 @@
+/* Create descriptor from file descriptor for processing file.
+ Copyright (C) 2002, 2003, 2004, 2005 Red Hat, Inc.
+ This file is part of elfutils.
+ Written by Ulrich Drepper <drepper@redhat.com>, 2002.
+
+ 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 <errno.h>
+#include <stddef.h>
+#include <sys/stat.h>
+
+#include <libdwP.h>
+
+
+Dwarf *
+dwarf_begin (int fd, Dwarf_Cmd cmd)
+{
+ Elf *elf;
+ Elf_Cmd elfcmd;
+ Dwarf *result = NULL;
+
+ switch (cmd)
+ {
+ case DWARF_C_READ:
+ elfcmd = ELF_C_READ_MMAP;
+ break;
+ case DWARF_C_WRITE:
+ elfcmd = ELF_C_WRITE;
+ break;
+ case DWARF_C_RDWR:
+ elfcmd = ELF_C_RDWR;
+ break;
+ default:
+ /* No valid mode. */
+ __libdw_seterrno (DWARF_E_INVALID_CMD);
+ return NULL;
+ }
+
+ /* We have to call `elf_version' here since the user might have not
+ done it or initialized libelf with a different version. This
+ would break libdwarf since we are using the ELF data structures
+ in a certain way. */
+ elf_version (EV_CURRENT);
+
+ /* Get an ELF descriptor. */
+ elf = elf_begin (fd, elfcmd, NULL);
+ if (elf == NULL)
+ {
+ /* Test why the `elf_begin" call failed. */
+ struct stat st;
+
+ if (fstat (fd, &st) == 0 && ! S_ISREG (st.st_mode))
+ __libdw_seterrno (DWARF_E_NO_REGFILE);
+ else if (errno == EBADF)
+ __libdw_seterrno (DWARF_E_INVALID_FILE);
+ else
+ __libdw_seterrno (DWARF_E_IO_ERROR);
+ }
+ else
+ {
+ /* Do the real work now that we have an ELF descriptor. */
+ result = INTUSE(dwarf_begin_elf) (elf, cmd, NULL);
+
+ /* If this failed, free the resources. */
+ if (result == NULL)
+ elf_end (elf);
+ else
+ result->free_elf = true;
+ }
+
+ return result;
+}
+INTDEF(dwarf_begin)