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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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