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| 1 /* Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
| 2 * Use of this source code is governed by a BSD-style license that can be | |
| 3 * found in the LICENSE file. | |
| 4 */ | |
| 5 #ifndef LIBRARIES_NACL_MOUNTS_KERNEL_HANDLE_H_ | |
| 6 #define LIBRARIES_NACL_MOUNTS_KERNEL_HANDLE_H_ | |
| 7 | |
| 8 #include <pthread.h> | |
| 9 | |
| 10 #include "nacl_mounts/ostypes.h" | |
| 11 #include "utils/macros.h" | |
| 12 #include "utils/ref_object.h" | |
| 13 | |
| 14 class Mount; | |
| 15 class MountNode; | |
| 16 | |
| 17 // KernelHandle provides a reference counted container for the open | |
| 18 // file information, such as it's mount, node, access type and offset. | |
| 19 // KernelHandle can only be referenced when the KernelProxy lock is held. | |
| 20 class KernelHandle : public RefObject { | |
| 21 public: | |
| 22 KernelHandle(Mount* mnt, MountNode* node, int oflags); | |
| 23 | |
| 24 off_t Seek(off_t offset, int whence); | |
| 25 | |
| 26 Mount* mount_; | |
| 27 MountNode* node_; | |
| 28 int mode_; | |
| 29 size_t offs_; | |
| 30 | |
| 31 private: | |
| 32 // May only be called by the KernelProxy when the Kernel's | |
| 33 // lock is held. | |
| 34 friend class KernelObject; | |
| 35 friend class KernelProxy; | |
| 36 void Acquire() { RefObject::Acquire(); } | |
| 37 bool Release() { return RefObject::Release(); } | |
| 38 DISALLOW_COPY_AND_ASSIGN(KernelHandle); | |
| 39 }; | |
| 40 | |
| 41 #endif // LIBRARIES_NACL_MOUNTS_KERNEL_HANDLE_H_ | |
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