102 lines
3.0 KiB
C++
102 lines
3.0 KiB
C++
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// Copyright (c) 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/debug/proc_maps_linux.h"
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#if defined(OS_LINUX)
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#include <inttypes.h>
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#endif
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#include "base/file_util.h"
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#include "base/strings/string_split.h"
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#if defined(OS_ANDROID)
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// Bionic's inttypes.h defines PRI/SCNxPTR as an unsigned long int, which
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// is incompatible with Bionic's stdint.h defining uintptr_t as a unsigned int:
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// https://code.google.com/p/android/issues/detail?id=57218
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#undef SCNxPTR
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#define SCNxPTR "x"
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#endif
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namespace base {
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namespace debug {
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bool ReadProcMaps(std::string* proc_maps) {
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FilePath proc_maps_path("/proc/self/maps");
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return file_util::ReadFileToString(proc_maps_path, proc_maps);
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}
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bool ParseProcMaps(const std::string& input,
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std::vector<MappedMemoryRegion>* regions_out) {
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std::vector<MappedMemoryRegion> regions;
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// This isn't async safe nor terribly efficient, but it doesn't need to be at
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// this point in time.
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std::vector<std::string> lines;
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SplitString(input, '\n', &lines);
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for (size_t i = 0; i < lines.size(); ++i) {
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// Due to splitting on '\n' the last line should be empty.
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if (i == lines.size() - 1) {
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if (!lines[i].empty())
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return false;
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break;
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}
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MappedMemoryRegion region;
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const char* line = lines[i].c_str();
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char permissions[5] = {'\0'}; // Ensure NUL-terminated string.
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uint8 dev_major = 0;
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uint8 dev_minor = 0;
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long inode = 0;
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int path_index = 0;
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// Sample format from man 5 proc:
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//
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// address perms offset dev inode pathname
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// 08048000-08056000 r-xp 00000000 03:0c 64593 /usr/sbin/gpm
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//
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// The final %n term captures the offset in the input string, which is used
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// to determine the path name. It *does not* increment the return value.
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// Refer to man 3 sscanf for details.
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if (sscanf(line, "%" SCNxPTR "-%" SCNxPTR " %4c %llx %hhx:%hhx %ld %n",
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®ion.start, ®ion.end, permissions, ®ion.offset,
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&dev_major, &dev_minor, &inode, &path_index) < 7) {
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return false;
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}
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region.permissions = 0;
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if (permissions[0] == 'r')
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region.permissions |= MappedMemoryRegion::READ;
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else if (permissions[0] != '-')
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return false;
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if (permissions[1] == 'w')
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region.permissions |= MappedMemoryRegion::WRITE;
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else if (permissions[1] != '-')
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return false;
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if (permissions[2] == 'x')
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region.permissions |= MappedMemoryRegion::EXECUTE;
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else if (permissions[2] != '-')
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return false;
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if (permissions[3] == 'p')
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region.permissions |= MappedMemoryRegion::PRIVATE;
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else if (permissions[3] != 's' && permissions[3] != 'S') // Shared memory.
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return false;
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// Pushing then assigning saves us a string copy.
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regions.push_back(region);
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regions.back().path.assign(line + path_index);
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}
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regions_out->swap(regions);
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return true;
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}
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} // namespace debug
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} // namespace base
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