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Side by Side Diff: base/file_descriptor_shuffle.h

Issue 7461141: Rename BASE_API to BASE_EXPORT. (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 BASE_FILE_DESCRIPTOR_SHUFFLE_H_ 5 #ifndef BASE_FILE_DESCRIPTOR_SHUFFLE_H_
6 #define BASE_FILE_DESCRIPTOR_SHUFFLE_H_ 6 #define BASE_FILE_DESCRIPTOR_SHUFFLE_H_
7 #pragma once 7 #pragma once
8 8
9 // This code exists to perform the shuffling of file descriptors which is 9 // This code exists to perform the shuffling of file descriptors which is
10 // commonly needed when forking subprocesses. The naive approve is very simple, 10 // commonly needed when forking subprocesses. The naive approve is very simple,
11 // just call dup2 to setup the desired descriptors, but wrong. It's tough to 11 // just call dup2 to setup the desired descriptors, but wrong. It's tough to
12 // handle the edge cases (like mapping 0 -> 1, 1 -> 0) correctly. 12 // handle the edge cases (like mapping 0 -> 1, 1 -> 0) correctly.
13 // 13 //
14 // In order to unittest this code, it's broken into the abstract action (an 14 // In order to unittest this code, it's broken into the abstract action (an
15 // injective multimap) and the concrete code for dealing with file descriptors. 15 // injective multimap) and the concrete code for dealing with file descriptors.
16 // Users should use the code like this: 16 // Users should use the code like this:
17 // base::InjectiveMultimap file_descriptor_map; 17 // base::InjectiveMultimap file_descriptor_map;
18 // file_descriptor_map.push_back(base::InjectionArc(devnull, 0, true)); 18 // file_descriptor_map.push_back(base::InjectionArc(devnull, 0, true));
19 // file_descriptor_map.push_back(base::InjectionArc(devnull, 2, true)); 19 // file_descriptor_map.push_back(base::InjectionArc(devnull, 2, true));
20 // file_descriptor_map.push_back(base::InjectionArc(pipe[1], 1, true)); 20 // file_descriptor_map.push_back(base::InjectionArc(pipe[1], 1, true));
21 // base::ShuffleFileDescriptors(file_descriptor_map); 21 // base::ShuffleFileDescriptors(file_descriptor_map);
22 // 22 //
23 // and trust the the Right Thing will get done. 23 // and trust the the Right Thing will get done.
24 24
25 #include <vector> 25 #include <vector>
26 26
27 #include "base/base_api.h" 27 #include "base/base_export.h"
28 28
29 namespace base { 29 namespace base {
30 30
31 // A Delegate which performs the actions required to perform an injective 31 // A Delegate which performs the actions required to perform an injective
32 // multimapping in place. 32 // multimapping in place.
33 class InjectionDelegate { 33 class InjectionDelegate {
34 public: 34 public:
35 // Duplicate |fd|, an element of the domain, and write a fresh element of the 35 // Duplicate |fd|, an element of the domain, and write a fresh element of the
36 // domain into |result|. Returns true iff successful. 36 // domain into |result|. Returns true iff successful.
37 virtual bool Duplicate(int* result, int fd) = 0; 37 virtual bool Duplicate(int* result, int fd) = 0;
(...skipping 24 matching lines...) Expand all
62 } 62 }
63 63
64 int source; 64 int source;
65 int dest; 65 int dest;
66 bool close; // if true, delete the source element after performing the 66 bool close; // if true, delete the source element after performing the
67 // mapping. 67 // mapping.
68 }; 68 };
69 69
70 typedef std::vector<InjectionArc> InjectiveMultimap; 70 typedef std::vector<InjectionArc> InjectiveMultimap;
71 71
72 BASE_API bool PerformInjectiveMultimap(const InjectiveMultimap& map, 72 BASE_EXPORT bool PerformInjectiveMultimap(const InjectiveMultimap& map,
73 InjectionDelegate* delegate); 73 InjectionDelegate* delegate);
74 74
75 BASE_API bool PerformInjectiveMultimapDestructive(InjectiveMultimap* map, 75 BASE_EXPORT bool PerformInjectiveMultimapDestructive(
76 InjectionDelegate* delegate); 76 InjectiveMultimap* map,
77 InjectionDelegate* delegate);
77 78
78 // This function will not call malloc but will mutate |map| 79 // This function will not call malloc but will mutate |map|
79 static inline bool ShuffleFileDescriptors(InjectiveMultimap* map) { 80 static inline bool ShuffleFileDescriptors(InjectiveMultimap* map) {
80 FileDescriptorTableInjection delegate; 81 FileDescriptorTableInjection delegate;
81 return PerformInjectiveMultimapDestructive(map, &delegate); 82 return PerformInjectiveMultimapDestructive(map, &delegate);
82 } 83 }
83 84
84 } // namespace base 85 } // namespace base
85 86
86 #endif // BASE_FILE_DESCRIPTOR_SHUFFLE_H_ 87 #endif // BASE_FILE_DESCRIPTOR_SHUFFLE_H_
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