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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef IPC_FILE_DESCRIPTOR_SET_POSIX_H_ | 5 #ifndef IPC_FILE_DESCRIPTOR_SET_POSIX_H_ |
6 #define IPC_FILE_DESCRIPTOR_SET_POSIX_H_ | 6 #define IPC_FILE_DESCRIPTOR_SET_POSIX_H_ |
7 | 7 |
8 #include <vector> | 8 #include <vector> |
9 | 9 |
10 #include "base/basictypes.h" | 10 #include "base/basictypes.h" |
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24 FileDescriptorSet(); | 24 FileDescriptorSet(); |
25 | 25 |
26 // This is the maximum number of descriptors per message. We need to know this | 26 // This is the maximum number of descriptors per message. We need to know this |
27 // because the control message kernel interface has to be given a buffer which | 27 // because the control message kernel interface has to be given a buffer which |
28 // is large enough to store all the descriptor numbers. Otherwise the kernel | 28 // is large enough to store all the descriptor numbers. Otherwise the kernel |
29 // tells us that it truncated the control data and the extra descriptors are | 29 // tells us that it truncated the control data and the extra descriptors are |
30 // lost. | 30 // lost. |
31 // | 31 // |
32 // In debugging mode, it's a fatal error to try and add more than this number | 32 // In debugging mode, it's a fatal error to try and add more than this number |
33 // of descriptors to a FileDescriptorSet. | 33 // of descriptors to a FileDescriptorSet. |
34 static const size_t kMaxDescriptorsPerMessage = 7; | 34 static const size_t kMaxDescriptorsPerMessage = 128; |
35 | 35 |
36 // --------------------------------------------------------------------------- | 36 // --------------------------------------------------------------------------- |
37 // Interfaces for building during message serialisation... | 37 // Interfaces for building during message serialisation... |
38 | 38 |
39 // Add a descriptor to the end of the set. Returns false iff the set is full. | 39 // Add a descriptor to the end of the set. Returns false iff the set is full. |
40 bool AddToBorrow(base::PlatformFile fd); | 40 bool AddToBorrow(base::PlatformFile fd); |
41 // Add a descriptor to the end of the set and automatically close it after | 41 // Add a descriptor to the end of the set and automatically close it after |
42 // transmission. Returns false iff the set is full. | 42 // transmission. Returns false iff the set is full. |
43 bool AddToOwn(base::ScopedFD fd); | 43 bool AddToOwn(base::ScopedFD fd); |
44 | 44 |
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110 // This contains the index of the next descriptor which should be consumed. | 110 // This contains the index of the next descriptor which should be consumed. |
111 // It's used in a couple of ways. Firstly, at destruction we can check that | 111 // It's used in a couple of ways. Firstly, at destruction we can check that |
112 // all the descriptors have been read (with GetNthDescriptor). Secondly, we | 112 // all the descriptors have been read (with GetNthDescriptor). Secondly, we |
113 // can check that they are read in order. | 113 // can check that they are read in order. |
114 mutable unsigned consumed_descriptor_highwater_; | 114 mutable unsigned consumed_descriptor_highwater_; |
115 | 115 |
116 DISALLOW_COPY_AND_ASSIGN(FileDescriptorSet); | 116 DISALLOW_COPY_AND_ASSIGN(FileDescriptorSet); |
117 }; | 117 }; |
118 | 118 |
119 #endif // IPC_FILE_DESCRIPTOR_SET_POSIX_H_ | 119 #endif // IPC_FILE_DESCRIPTOR_SET_POSIX_H_ |
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