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| 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 | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "content/common/child_process_info.h" | |
| 6 | |
| 7 #include <limits> | |
| 8 | |
| 9 #include "base/atomicops.h" | |
| 10 #include "base/i18n/rtl.h" | |
| 11 #include "base/logging.h" | |
| 12 #include "base/process_util.h" | |
| 13 #include "base/rand_util.h" | |
| 14 #include "base/stringprintf.h" | |
| 15 #include "base/utf_string_conversions.h" | |
| 16 | |
| 17 ChildProcessInfo::ChildProcessInfo(content::ProcessType type, int id) : | |
| 18 type_(type) { | |
| 19 if (id == -1) | |
| 20 id_ = GenerateChildProcessUniqueId(); | |
| 21 else | |
| 22 id_ = id; | |
| 23 } | |
| 24 | |
| 25 ChildProcessInfo::ChildProcessInfo(const ChildProcessInfo& original) | |
| 26 : type_(original.type_), | |
| 27 name_(original.name_), | |
| 28 version_(original.version_), | |
| 29 id_(original.id_), | |
| 30 process_(original.process_) { | |
| 31 } | |
| 32 | |
| 33 ChildProcessInfo::~ChildProcessInfo() { | |
| 34 } | |
| 35 | |
| 36 ChildProcessInfo& ChildProcessInfo::operator=( | |
| 37 const ChildProcessInfo& original) { | |
| 38 if (&original != this) { | |
| 39 type_ = original.type_; | |
| 40 name_ = original.name_; | |
| 41 version_ = original.version_; | |
| 42 id_ = original.id_; | |
| 43 process_ = original.process_; | |
| 44 } | |
| 45 return *this; | |
| 46 } | |
| 47 | |
| 48 std::string ChildProcessInfo::GenerateRandomChannelID(void* instance) { | |
| 49 // Note: the string must start with the current process id, this is how | |
| 50 // child processes determine the pid of the parent. | |
| 51 // Build the channel ID. This is composed of a unique identifier for the | |
| 52 // parent browser process, an identifier for the child instance, and a random | |
| 53 // component. We use a random component so that a hacked child process can't | |
| 54 // cause denial of service by causing future named pipe creation to fail. | |
| 55 return base::StringPrintf("%d.%p.%d", | |
| 56 base::GetCurrentProcId(), instance, | |
| 57 base::RandInt(0, std::numeric_limits<int>::max())); | |
| 58 } | |
| 59 | |
| 60 // static | |
| 61 int ChildProcessInfo::GenerateChildProcessUniqueId() { | |
| 62 // This function must be threadsafe. | |
| 63 static base::subtle::Atomic32 last_unique_child_id = 0; | |
| 64 return base::subtle::NoBarrier_AtomicIncrement(&last_unique_child_id, 1); | |
| 65 } | |
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