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Side by Side Diff: ipc/file_descriptor_set_posix.h

Issue 7633042: Create ipc.dll. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src/
Patch Set: '' Created 9 years, 4 months ago
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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 #pragma once 7 #pragma once
8 8
9 #include <vector> 9 #include <vector>
10 10
11 #include "base/basictypes.h" 11 #include "base/basictypes.h"
12 #include "base/file_descriptor_posix.h" 12 #include "base/file_descriptor_posix.h"
13 #include "base/memory/ref_counted.h" 13 #include "base/memory/ref_counted.h"
14 #include "ipc/ipc_export.h"
14 15
15 // ----------------------------------------------------------------------------- 16 // -----------------------------------------------------------------------------
16 // A FileDescriptorSet is an ordered set of POSIX file descriptors. These are 17 // A FileDescriptorSet is an ordered set of POSIX file descriptors. These are
17 // associated with IPC messages so that descriptors can be transmitted over a 18 // associated with IPC messages so that descriptors can be transmitted over a
18 // UNIX domain socket. 19 // UNIX domain socket.
19 // ----------------------------------------------------------------------------- 20 // -----------------------------------------------------------------------------
20 class FileDescriptorSet : public base::RefCountedThreadSafe<FileDescriptorSet> { 21 class IPC_EXPORT FileDescriptorSet
22 : public base::RefCountedThreadSafe<FileDescriptorSet> {
21 public: 23 public:
22 FileDescriptorSet(); 24 FileDescriptorSet();
23 25
24 // 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
25 // 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
26 // 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
27 // 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
28 // lost. 30 // lost.
29 // 31 //
30 // 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
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106 // This contains the index of the next descriptor which should be consumed. 108 // This contains the index of the next descriptor which should be consumed.
107 // It's used in a couple of ways. Firstly, at destruction we can check that 109 // It's used in a couple of ways. Firstly, at destruction we can check that
108 // all the descriptors have been read (with GetNthDescriptor). Secondly, we 110 // all the descriptors have been read (with GetNthDescriptor). Secondly, we
109 // can check that they are read in order. 111 // can check that they are read in order.
110 mutable unsigned consumed_descriptor_highwater_; 112 mutable unsigned consumed_descriptor_highwater_;
111 113
112 DISALLOW_COPY_AND_ASSIGN(FileDescriptorSet); 114 DISALLOW_COPY_AND_ASSIGN(FileDescriptorSet);
113 }; 115 };
114 116
115 #endif // IPC_FILE_DESCRIPTOR_SET_POSIX_H_ 117 #endif // IPC_FILE_DESCRIPTOR_SET_POSIX_H_
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