Rework File_read interface. Get file size. Use pread when

available.

1 files changed, 39 insertions, 0 deletions

diff --git a/gold/pread.c b/gold/pread.c
new file mode 100644
index 0000000000..1b0cf40e74
--- /dev/null
+++ b/gold/pread.c
@@ -0,0 +1,39 @@
+/* pread.c -- version of pread for gold.  */
+
+/* Copyright 2006, 2007 Free Software Foundation, Inc.
+   Written by Ian Lance Taylor <iant@google.com>.
+
+   This file is part of gold.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program 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 a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+   MA 02110-1301, USA.  */
+
+/* This file implements pread for systems which don't have it.  This
+   file is only compiled if pread is not present on the system.  This
+   is not an exact version of pread, as it does not preserve the
+   current file offset.  */
+
+#include "config.h"
+
+#include <sys/types.h>
+#include <unistd.h>
+
+ssize_t
+pread(int fd, void* buf, size_t count, off_t offset)
+{
+  if (lseek(fd, offset, SEEK_SET) != offset)
+    return -1;
+  return read(fd, buf, count);
+}