1 /* 2 * Copyright (C) 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include "src/traced/probes/filesystem/fs_mount.h" 18 19 #include <sys/types.h> 20 #include <unistd.h> 21 #include <fstream> 22 #include <sstream> 23 24 #include "perfetto/base/file_utils.h" 25 #include "perfetto/base/logging.h" 26 #include "perfetto/base/string_splitter.h" 27 28 namespace perfetto { 29 30 std::multimap<BlockDeviceID, std::string> ParseMounts(const char* path) { 31 std::string data; 32 if (!base::ReadFile(path, &data)) { 33 PERFETTO_ELOG("Failed to read %s", path); 34 return {}; 35 } 36 std::multimap<BlockDeviceID, std::string> device_to_mountpoints; 37 38 for (base::StringSplitter lines(std::move(data), '\n'); lines.Next();) { 39 base::StringSplitter words(&lines, ' '); 40 if (!words.Next() || !words.Next()) { 41 PERFETTO_DLOG("Invalid mount point: %s.", lines.cur_token()); 42 continue; 43 } 44 const char* mountpoint = words.cur_token(); 45 struct stat buf {}; 46 if (stat(mountpoint, &buf) == -1) { 47 PERFETTO_PLOG("stat %s", mountpoint); 48 continue; 49 } 50 device_to_mountpoints.emplace(buf.st_dev, mountpoint); 51 } 52 return device_to_mountpoints; 53 } 54 55 } // namespace perfetto 56
