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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 #include "base/memory/shared_memory.h" | 5 #include "base/memory/shared_memory.h" |
| 6 | 6 |
| 7 #include <sys/mman.h> | 7 #include <sys/mman.h> |
| 8 | 8 |
| 9 #include "base/logging.h" | 9 #include "base/logging.h" |
| 10 #include "third_party/ashmem/ashmem.h" | 10 #include "third_party/ashmem/ashmem.h" |
| 11 | 11 |
| 12 namespace base { | 12 namespace base { |
| 13 | 13 |
| 14 // For Android, we use ashmem to implement SharedMemory. ashmem_create_region | 14 // For Android, we use ashmem to implement SharedMemory. ashmem_create_region |
| 15 // will automatically pin the region. We never explicitly call pin/unpin. When | 15 // will automatically pin the region. We never explicitly call pin/unpin. When |
| 16 // all the file descriptors from different processes associated with the region | 16 // all the file descriptors from different processes associated with the region |
| 17 // are closed, the memory buffer will go away. | 17 // are closed, the memory buffer will go away. |
| 18 | 18 |
| 19 bool SharedMemory::Create(const SharedMemoryCreateOptions& options) { | 19 bool SharedMemory::Create(const SharedMemoryCreateOptions& options) { |
| 20 DCHECK_EQ(-1, mapped_file_ ); | 20 DCHECK_EQ(-1, mapped_file_ ); |
| 21 | 21 |
| 22 if (options.size > static_cast<size_t>(std::numeric_limits<int>::max())) | 22 if (options.size > static_cast<size_t>(std::numeric_limits<int>::max())) |
| 23 return false; | 23 return false; |
| 24 | 24 |
| 25 // "name" is just a label in ashmem. It is visible in /proc/pid/maps. | 25 // "name" is just a label in ashmem. It is visible in /proc/pid/maps. |
| 26 mapped_file_ = ashmem_create_region( | 26 mapped_file_ = ashmem_create_region( |
| 27 options.name == NULL ? "" : options.name->c_str(), | 27 options.name_deprecated == NULL ? "" : options.name_deprecated->c_str(), |
| 28 options.size); | 28 options.size); |
| 29 if (-1 == mapped_file_) { | 29 if (-1 == mapped_file_) { |
| 30 DLOG(ERROR) << "Shared memory creation failed"; | 30 DLOG(ERROR) << "Shared memory creation failed"; |
| 31 return false; | 31 return false; |
| 32 } | 32 } |
| 33 | 33 |
| 34 int err = ashmem_set_prot_region(mapped_file_, | 34 int err = ashmem_set_prot_region(mapped_file_, |
| 35 PROT_READ | PROT_WRITE | PROT_EXEC); | 35 PROT_READ | PROT_WRITE | PROT_EXEC); |
| 36 if (err < 0) { | 36 if (err < 0) { |
| 37 DLOG(ERROR) << "Error " << err << " when setting protection of ashmem"; | 37 DLOG(ERROR) << "Error " << err << " when setting protection of ashmem"; |
| (...skipping 19 matching lines...) Expand all Loading... |
| 57 return true; | 57 return true; |
| 58 } | 58 } |
| 59 | 59 |
| 60 bool SharedMemory::Open(const std::string& name, bool read_only) { | 60 bool SharedMemory::Open(const std::string& name, bool read_only) { |
| 61 // ashmem doesn't support name mapping | 61 // ashmem doesn't support name mapping |
| 62 NOTIMPLEMENTED(); | 62 NOTIMPLEMENTED(); |
| 63 return false; | 63 return false; |
| 64 } | 64 } |
| 65 | 65 |
| 66 } // namespace base | 66 } // namespace base |
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