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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 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 "mojo/edk/embedder/simple_platform_shared_buffer.h" | 5 #include "mojo/edk/embedder/simple_platform_shared_buffer.h" |
| 6 | 6 |
| 7 #include <stdint.h> | 7 #include <stdint.h> |
| 8 #include <stdio.h> // For |fileno()|. | 8 #include <stdio.h> // For |fileno()|. |
| 9 #include <sys/mman.h> // For |mmap()|/|munmap()|. | 9 #include <sys/mman.h> // For |mmap()|/|munmap()|. |
| 10 #include <sys/stat.h> | 10 #include <sys/stat.h> |
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| 120 size_t length) { | 120 size_t length) { |
| 121 size_t offset_rounding = offset % base::SysInfo::VMAllocationGranularity(); | 121 size_t offset_rounding = offset % base::SysInfo::VMAllocationGranularity(); |
| 122 size_t real_offset = offset - offset_rounding; | 122 size_t real_offset = offset - offset_rounding; |
| 123 size_t real_length = length + offset_rounding; | 123 size_t real_length = length + offset_rounding; |
| 124 | 124 |
| 125 // This should hold (since we checked |num_bytes| versus the maximum value of | 125 // This should hold (since we checked |num_bytes| versus the maximum value of |
| 126 // |off_t| on creation, but it never hurts to be paranoid. | 126 // |off_t| on creation, but it never hurts to be paranoid. |
| 127 DCHECK_LE(static_cast<uint64_t>(real_offset), | 127 DCHECK_LE(static_cast<uint64_t>(real_offset), |
| 128 static_cast<uint64_t>(std::numeric_limits<off_t>::max())); | 128 static_cast<uint64_t>(std::numeric_limits<off_t>::max())); |
| 129 | 129 |
| 130 void* real_base = mmap(nullptr, | 130 void* real_base = |
| 131 real_length, | 131 mmap(nullptr, real_length, PROT_READ | PROT_WRITE, MAP_SHARED, |
| 132 PROT_READ | PROT_WRITE, | 132 handle_.get().fd, static_cast<off_t>(real_offset)); |
| 133 MAP_SHARED, | |
| 134 handle_.get().fd, | |
| 135 static_cast<off_t>(real_offset)); | |
| 136 // |mmap()| should return |MAP_FAILED| (a.k.a. -1) on error. But it shouldn't | 133 // |mmap()| should return |MAP_FAILED| (a.k.a. -1) on error. But it shouldn't |
| 137 // return null either. | 134 // return null either. |
| 138 if (real_base == MAP_FAILED || !real_base) { | 135 if (real_base == MAP_FAILED || !real_base) { |
| 139 PLOG(ERROR) << "mmap"; | 136 PLOG(ERROR) << "mmap"; |
| 140 return nullptr; | 137 return nullptr; |
| 141 } | 138 } |
| 142 | 139 |
| 143 void* base = static_cast<char*>(real_base) + offset_rounding; | 140 void* base = static_cast<char*>(real_base) + offset_rounding; |
| 144 return make_scoped_ptr(new SimplePlatformSharedBufferMapping( | 141 return make_scoped_ptr(new SimplePlatformSharedBufferMapping( |
| 145 base, length, real_base, real_length)); | 142 base, length, real_base, real_length)); |
| 146 } | 143 } |
| 147 | 144 |
| 148 // SimplePlatformSharedBufferMapping ------------------------------------------- | 145 // SimplePlatformSharedBufferMapping ------------------------------------------- |
| 149 | 146 |
| 150 void SimplePlatformSharedBufferMapping::Unmap() { | 147 void SimplePlatformSharedBufferMapping::Unmap() { |
| 151 int result = munmap(real_base_, real_length_); | 148 int result = munmap(real_base_, real_length_); |
| 152 PLOG_IF(ERROR, result != 0) << "munmap"; | 149 PLOG_IF(ERROR, result != 0) << "munmap"; |
| 153 } | 150 } |
| 154 | 151 |
| 155 } // namespace embedder | 152 } // namespace embedder |
| 156 } // namespace mojo | 153 } // namespace mojo |
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