1 files changed, 85 insertions, 0 deletions
diff --git a/libdw/dwarf_begin.c b/libdw/dwarf_begin.c
new file mode 100644
index 00000000..a2ffa1c6
--- /dev/null
+++ b/libdw/dwarf_begin.c
@@ -0,0 +1,85 @@
+/* Create descriptor from file descriptor for processing file.
+   Copyright (C) 2002, 2003, 2004 Red Hat, Inc.
+   Written by Ulrich Drepper <drepper@redhat.com>, 2002.
+
+   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 <errno.h>
+#include <stddef.h>
+#include <sys/stat.h>
+
+#include <libdwP.h>
+
+
+Dwarf *
+dwarf_begin (fd, cmd)
+     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 stat64 st;
+
+      if (fstat64 (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 = 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;
+}