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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> |
| 11 #include <sys/types.h> // For |off_t|. | 11 #include <sys/types.h> // For |off_t|. |
| 12 #include <unistd.h> | 12 #include <unistd.h> |
| 13 | 13 |
| 14 #include <limits> | 14 #include <limits> |
| 15 | 15 |
| 16 #include "base/files/file_path.h" | 16 #include "base/files/file_path.h" |
| 17 #include "base/files/file_util.h" | 17 #include "base/files/file_util.h" |
| 18 #include "base/files/scoped_file.h" | |
| 19 #include "base/logging.h" | 18 #include "base/logging.h" |
| 20 #include "base/posix/eintr_wrapper.h" | 19 #include "base/posix/eintr_wrapper.h" |
| 21 #include "base/sys_info.h" | 20 #include "base/sys_info.h" |
| 22 #include "base/threading/thread_restrictions.h" | 21 #include "base/threading/thread_restrictions.h" |
| 22 #include "mojo/edk/util/scoped_file.h" |
| 23 | 23 |
| 24 // We assume that |size_t| and |off_t| (type for |ftruncate()|) fits in a | 24 // We assume that |size_t| and |off_t| (type for |ftruncate()|) fits in a |
| 25 // |uint64_t|. | 25 // |uint64_t|. |
| 26 static_assert(sizeof(size_t) <= sizeof(uint64_t), "size_t too big"); | 26 static_assert(sizeof(size_t) <= sizeof(uint64_t), "size_t too big"); |
| 27 static_assert(sizeof(off_t) <= sizeof(uint64_t), "off_t too big"); | 27 static_assert(sizeof(off_t) <= sizeof(uint64_t), "off_t too big"); |
| 28 | 28 |
| 29 namespace mojo { | 29 namespace mojo { |
| 30 namespace embedder { | 30 namespace embedder { |
| 31 | 31 |
| 32 // SimplePlatformSharedBuffer -------------------------------------------------- | 32 // SimplePlatformSharedBuffer -------------------------------------------------- |
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| 49 // |CreateAndOpenTemporaryFileInDir()| starts with an FD, |fdopen()|s to get a | 49 // |CreateAndOpenTemporaryFileInDir()| starts with an FD, |fdopen()|s to get a |
| 50 // |FILE*|, and then we have to |dup(fileno(fp))| to get back to an FD that we | 50 // |FILE*|, and then we have to |dup(fileno(fp))| to get back to an FD that we |
| 51 // can own. (base/memory/shared_memory_posix.cc does this too, with more | 51 // can own. (base/memory/shared_memory_posix.cc does this too, with more |
| 52 // |fstat()|s thrown in for good measure.) | 52 // |fstat()|s thrown in for good measure.) |
| 53 base::FilePath shared_buffer_dir; | 53 base::FilePath shared_buffer_dir; |
| 54 if (!base::GetShmemTempDir(false, &shared_buffer_dir)) { | 54 if (!base::GetShmemTempDir(false, &shared_buffer_dir)) { |
| 55 LOG(ERROR) << "Failed to get temporary directory for shared memory"; | 55 LOG(ERROR) << "Failed to get temporary directory for shared memory"; |
| 56 return false; | 56 return false; |
| 57 } | 57 } |
| 58 base::FilePath shared_buffer_file; | 58 base::FilePath shared_buffer_file; |
| 59 base::ScopedFILE fp(base::CreateAndOpenTemporaryFileInDir( | 59 util::ScopedFILE fp(base::CreateAndOpenTemporaryFileInDir( |
| 60 shared_buffer_dir, &shared_buffer_file)); | 60 shared_buffer_dir, &shared_buffer_file)); |
| 61 if (!fp) { | 61 if (!fp) { |
| 62 LOG(ERROR) << "Failed to create/open temporary file for shared memory"; | 62 LOG(ERROR) << "Failed to create/open temporary file for shared memory"; |
| 63 return false; | 63 return false; |
| 64 } | 64 } |
| 65 // Note: |unlink()| is not interruptible. | 65 // Note: |unlink()| is not interruptible. |
| 66 if (unlink(shared_buffer_file.value().c_str()) != 0) { | 66 if (unlink(shared_buffer_file.value().c_str()) != 0) { |
| 67 PLOG(WARNING) << "unlink"; | 67 PLOG(WARNING) << "unlink"; |
| 68 // This isn't "fatal" (e.g., someone else may have unlinked the file first), | 68 // This isn't "fatal" (e.g., someone else may have unlinked the file first), |
| 69 // so we may as well continue. | 69 // so we may as well continue. |
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| 149 | 149 |
| 150 // SimplePlatformSharedBufferMapping ------------------------------------------- | 150 // SimplePlatformSharedBufferMapping ------------------------------------------- |
| 151 | 151 |
| 152 void SimplePlatformSharedBufferMapping::Unmap() { | 152 void SimplePlatformSharedBufferMapping::Unmap() { |
| 153 int result = munmap(real_base_, real_length_); | 153 int result = munmap(real_base_, real_length_); |
| 154 PLOG_IF(ERROR, result != 0) << "munmap"; | 154 PLOG_IF(ERROR, result != 0) << "munmap"; |
| 155 } | 155 } |
| 156 | 156 |
| 157 } // namespace embedder | 157 } // namespace embedder |
| 158 } // namespace mojo | 158 } // namespace mojo |
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