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1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2013 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/debug/proc_maps_linux.h" | 5 #include "base/debug/proc_maps_linux.h" |
6 | 6 |
7 #if defined(OS_LINUX) | 7 #if defined(OS_LINUX) |
8 #include <inttypes.h> | 8 #include <inttypes.h> |
9 #endif | 9 #endif |
10 | 10 |
11 #include "base/file_util.h" | 11 #include "base/file_util.h" |
12 #include "base/strings/string_split.h" | 12 #include "base/strings/string_split.h" |
13 | 13 |
14 #if defined(OS_ANDROID) | 14 #if defined(OS_ANDROID) |
15 // Bionic's inttypes.h defines PRI/SCNxPTR as an unsigned long int, which | 15 // Bionic's inttypes.h defines PRI/SCNxPTR as an unsigned long int, which |
16 // is incompatible with Bionic's stdint.h defining uintptr_t as a unsigned int: | 16 // is incompatible with Bionic's stdint.h defining uintptr_t as a unsigned int: |
17 // https://code.google.com/p/android/issues/detail?id=57218 | 17 // https://code.google.com/p/android/issues/detail?id=57218 |
18 #undef SCNxPTR | 18 #undef SCNxPTR |
19 #define SCNxPTR "x" | 19 #define SCNxPTR "x" |
20 #endif | 20 #endif |
21 | 21 |
22 namespace base { | 22 namespace base { |
23 namespace debug { | 23 namespace debug { |
24 | 24 |
25 // Local testing revealed that the size of /proc/<pid>/maps for an official | |
26 // release build of chrome hovered around the ~45 KB mark with some processes | |
27 // hitting 80-90 KB. We'll play it safe and use 256 KB. | |
28 enum { kLargeProcMapsSize = 256 * 1024 }; | |
Mark Mentovai
2013/07/11 03:47:50
Why an enum? Why not a const?
And why is it out h
| |
29 | |
25 bool ReadProcMaps(std::string* proc_maps) { | 30 bool ReadProcMaps(std::string* proc_maps) { |
31 // It's possible for /proc/self/maps to change during reading (e.g., when | |
32 // running under ThreadSanitizer). Resize |proc_maps| to be large enough | |
33 // to read without causing a reallocation. | |
34 // | |
35 // Refer to http://crbug.com/258451 for details. | |
36 proc_maps->clear(); | |
37 proc_maps->reserve(kLargeProcMapsSize); | |
Mark Mentovai
2013/07/11 03:47:50
How is this supposed to help…?
| |
38 | |
26 FilePath proc_maps_path("/proc/self/maps"); | 39 FilePath proc_maps_path("/proc/self/maps"); |
27 return file_util::ReadFileToString(proc_maps_path, proc_maps); | 40 return file_util::ReadFileToString(proc_maps_path, proc_maps); |
Mark Mentovai
2013/07/11 03:47:50
…file_util::ReadFileToString still reads chunks of
Alexander Potapenko
2013/07/11 10:28:54
Maybe base::MemoryMappedFile could be used instead
Mark Mentovai
2013/07/11 14:20:40
Alexander Potapenko wrote:
| |
28 } | 41 } |
29 | 42 |
30 bool ParseProcMaps(const std::string& input, | 43 bool ParseProcMaps(const std::string& input, |
31 std::vector<MappedMemoryRegion>* regions_out) { | 44 std::vector<MappedMemoryRegion>* regions_out) { |
32 std::vector<MappedMemoryRegion> regions; | 45 std::vector<MappedMemoryRegion> regions; |
33 | 46 |
34 // This isn't async safe nor terribly efficient, but it doesn't need to be at | 47 // This isn't async safe nor terribly efficient, but it doesn't need to be at |
35 // this point in time. | 48 // this point in time. |
36 std::vector<std::string> lines; | 49 std::vector<std::string> lines; |
37 SplitString(input, '\n', &lines); | 50 SplitString(input, '\n', &lines); |
(...skipping 54 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... | |
92 regions.push_back(region); | 105 regions.push_back(region); |
93 regions.back().path.assign(line + path_index); | 106 regions.back().path.assign(line + path_index); |
94 } | 107 } |
95 | 108 |
96 regions_out->swap(regions); | 109 regions_out->swap(regions); |
97 return true; | 110 return true; |
98 } | 111 } |
99 | 112 |
100 } // namespace debug | 113 } // namespace debug |
101 } // namespace base | 114 } // namespace base |
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