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1 // Copyright (c) 2009 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2009 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 #include "chrome/common/child_process_info.h" | 5 #include "chrome/common/child_process_info.h" |
6 | 6 |
7 #include <limits> | 7 #include <limits> |
8 | 8 |
9 #include "app/l10n_util.h" | 9 #include "app/l10n_util.h" |
10 #include "base/atomicops.h" | 10 #include "base/atomicops.h" |
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99 id_ = id; | 99 id_ = id; |
100 } | 100 } |
101 | 101 |
102 std::string ChildProcessInfo::GenerateRandomChannelID(void* instance) { | 102 std::string ChildProcessInfo::GenerateRandomChannelID(void* instance) { |
103 // Note: the string must start with the current process id, this is how | 103 // Note: the string must start with the current process id, this is how |
104 // child processes determine the pid of the parent. | 104 // child processes determine the pid of the parent. |
105 // Build the channel ID. This is composed of a unique identifier for the | 105 // Build the channel ID. This is composed of a unique identifier for the |
106 // parent browser process, an identifier for the child instance, and a random | 106 // parent browser process, an identifier for the child instance, and a random |
107 // component. We use a random component so that a hacked child process can't | 107 // component. We use a random component so that a hacked child process can't |
108 // cause denial of service by causing future named pipe creation to fail. | 108 // cause denial of service by causing future named pipe creation to fail. |
109 return StringPrintf("%d.%x.%d", | 109 return StringPrintf("%d.%p.%d", |
110 base::GetCurrentProcId(), instance, | 110 base::GetCurrentProcId(), instance, |
111 base::RandInt(0, std::numeric_limits<int>::max())); | 111 base::RandInt(0, std::numeric_limits<int>::max())); |
112 } | 112 } |
113 | 113 |
114 // static | 114 // static |
115 int ChildProcessInfo::GenerateChildProcessUniqueId() { | 115 int ChildProcessInfo::GenerateChildProcessUniqueId() { |
116 // This function must be threadsafe. | 116 // This function must be threadsafe. |
117 static base::subtle::Atomic32 last_unique_child_id = 0; | 117 static base::subtle::Atomic32 last_unique_child_id = 0; |
118 return base::subtle::NoBarrier_AtomicIncrement(&last_unique_child_id, 1); | 118 return base::subtle::NoBarrier_AtomicIncrement(&last_unique_child_id, 1); |
119 } | 119 } |
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