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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 | |
3 // found in the LICENSE file. | |
4 | |
5 #include "base/debug/proc_maps_linux.h" | |
6 | |
7 #if defined(OS_LINUX) | |
8 #include <inttypes.h> | |
9 #endif | |
10 | |
11 #if defined(OS_ANDROID) | |
12 // Bionic's inttypes.h defines PRI/SCNxPTR as an unsigned long int, which | |
13 // is incompatible with Bionic's stdint.h defining uintptr_t as a unsigned int: | |
14 // https://code.google.com/p/android/issues/detail?id=57218 | |
15 #define SCNxPTR "x" | |
16 #endif | |
17 | |
18 #include "base/file_util.h" | |
19 #include "base/strings/string_split.h" | |
20 | |
21 namespace base { | |
22 namespace debug { | |
23 | |
24 bool ReadProcMaps(std::string* proc_maps) { | |
25 FilePath proc_maps_path("/proc/self/maps"); | |
26 return file_util::ReadFileToString(proc_maps_path, proc_maps); | |
27 } | |
28 | |
29 bool ParseProcMaps(const std::string& input, | |
30 std::vector<MappedMemoryRegion>* regions_out) { | |
31 std::vector<MappedMemoryRegion> regions; | |
32 | |
33 // This isn't async safe nor terribly efficient, but it doesn't need to be at | |
34 // this point in time. | |
35 std::vector<std::string> lines; | |
36 SplitString(input, '\n', &lines); | |
37 | |
38 for (size_t i = 0; i < lines.size(); ++i) { | |
39 // Due to splitting on '\n' the last line should be empty. | |
40 if (i == lines.size() - 1) { | |
41 if (!lines[i].empty()) | |
42 return false; | |
43 break; | |
44 } | |
45 | |
46 MappedMemoryRegion region; | |
47 const char* line = lines[i].c_str(); | |
48 char permissions[5] = {'\0'}; // Ensure NUL-terminated string. | |
49 uint8 dev_major = 0; | |
50 uint8 dev_minor = 0; | |
51 long inode = 0; | |
52 int path_index = 0; | |
53 | |
54 // Sample format from man 5 proc: | |
55 // | |
56 // address perms offset dev inode pathname | |
57 // 08048000-08056000 r-xp 00000000 03:0c 64593 /usr/sbin/gpm | |
58 // | |
59 // The final %n term captures the offset in the input string, which is used | |
60 // to determine the path name. It *does not* increment the return value. | |
61 // Refer to man 3 sscanf for details. | |
62 if (sscanf(line, "%" SCNxPTR "-%" SCNxPTR " %4c %llx %hhx:%hhx %ld %n", | |
63 ®ion.start, ®ion.end, permissions, ®ion.offset, | |
64 &dev_major, &dev_minor, &inode, &path_index) < 7) { | |
65 return false; | |
66 } | |
67 | |
68 region.permissions = 0; | |
69 | |
70 if (permissions[0] == 'r') | |
71 region.permissions |= MappedMemoryRegion::READ; | |
72 else if (permissions[0] != '-') | |
73 return false; | |
74 | |
75 if (permissions[1] == 'w') | |
76 region.permissions |= MappedMemoryRegion::WRITE; | |
77 else if (permissions[1] != '-') | |
78 return false; | |
79 | |
80 if (permissions[2] == 'x') | |
81 region.permissions |= MappedMemoryRegion::EXECUTE; | |
82 else if (permissions[2] != '-') | |
83 return false; | |
84 | |
85 if (permissions[3] == 'p') | |
86 region.permissions |= MappedMemoryRegion::PRIVATE; | |
87 else if (permissions[3] != 's' && permissions[3] != 'S') // Shared memory. | |
88 return false; | |
89 | |
90 region.path.assign(line + path_index); | |
91 regions.push_back(region); | |
scherkus (not reviewing)
2013/07/02 21:48:38
hrmm.. I guess I could cut down on a string copy i
scherkus (not reviewing)
2013/07/02 22:04:34
went ahead and did it -- can't hurt!
Mark Mentovai
2013/07/02 22:21:36
scherkus wrote:
| |
92 } | |
93 | |
94 regions_out->swap(regions); | |
95 return true; | |
96 } | |
97 | |
98 } // namespace debug | |
99 } // namespace base | |
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