Adds a modified copy of talk/base to webrtc/base. It is the first step in migrating talk/base to webrtc/base.

BUG=N/A
R=andrew@webrtc.org, wu@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/12199004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6107 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/base/linuxfdwalk.h

@@ -0,0 +1,34 @@
+/*
+ *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_BASE_LINUXFDWALK_H_
+#define WEBRTC_BASE_LINUXFDWALK_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Linux port of SunOS's fdwalk(3) call. It loops over all open file descriptors
+// and calls func on each one. Additionally, it is safe to use from the child
+// of a fork that hasn't exec'ed yet, so you can use it to close all open file
+// descriptors prior to exec'ing a daemon.
+// The return value is 0 if successful, or else -1 and errno is set. The
+// possible errors include any error that can be returned by opendir(),
+// readdir(), or closedir(), plus EBADF if there are problems parsing the
+// contents of /proc/self/fd.
+// The file descriptors that are enumerated will not include the file descriptor
+// used for the enumeration itself.
+int fdwalk(void (*func)(void *, int), void *opaque);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // WEBRTC_BASE_LINUXFDWALK_H_