Symlink.h

/*
 * Copyright (c) 2008-2014, Pedigree Developers
 *
 * Please see the CONTRIB file in the root of the source tree for a full
 * list of contributors.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
 
#ifndef SYMLINK_H
#define SYMLINK_H
 
#include "pedigree/kernel/Log.h"
#include "pedigree/kernel/compiler.h"
#include "pedigree/kernel/process/FilesystemContext.h"
#include "pedigree/kernel/processor/types.h"
#include "pedigree/kernel/time/Time.h"
#include "pedigree/kernel/utilities/String.h"
 
#include "Directory.h"
 
class EXPORTED_PUBLIC Symlink : public File {
  friend class Filesystem;
 
 public:
  static Symlink* fromFile(File* pF) {
    if (!pF->isSymlink())
      FATAL("Casting non-symlink File to Symlink!");
    return reinterpret_cast<Symlink*>(pF);
  }
 
  Symlink();
 
  Symlink(const Symlink& file);
 
 private:
  Symlink& operator=(const Symlink&);
 
 public:
  Symlink(const String& name, Time::Timestamp accessedTime, Time::Timestamp modifiedTime,
          Time::Timestamp creationTime, uintptr_t inode, class Filesystem* pFs, size_t size,
          File* pParent);
  virtual ~Symlink();
 
  virtual bool isSymlink() {
    return true;
  }
 
  virtual int followLink(char* pBuffer, size_t bufLen);
 
  virtual File* followLinkRetained(Directory::ChildLease& result);
 
  virtual bool isPathLink() const {
    return false;
  }
  virtual bool followPath(FilesystemPathRef&) {
    return false;
  }
 
 protected:
  static File* retainTarget(File* target, Directory::ChildLease& result);
 
  String m_sTarget;
 
  Mutex m_TargetLock;
 
  void initialise(bool bForce = false);
 
  virtual bool isBytewise() const;
};
 
#endif