1 /* 2 * Copyright (C) 2016 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 #define LOG_TAG "DEBUG" 18 19 #include <dirent.h> 20 #include <errno.h> 21 #include <stdio.h> 22 #include <stdlib.h> 23 #include <string.h> 24 #include <sys/types.h> 25 #include <unistd.h> 26 27 #include <string> 28 #include <utility> 29 #include <vector> 30 31 #include <android-base/file.h> 32 #include <log/log.h> 33 34 #include "open_files_list.h" 35 36 #include "utility.h" 37 38 void populate_open_files_list(pid_t pid, OpenFilesList* list) { 39 std::string fd_dir_name = "/proc/" + std::to_string(pid) + "/fd"; 40 std::unique_ptr<DIR, int (*)(DIR*)> dir(opendir(fd_dir_name.c_str()), closedir); 41 if (dir == nullptr) { 42 ALOGE("failed to open directory %s: %s", fd_dir_name.c_str(), strerror(errno)); 43 return; 44 } 45 46 struct dirent* de; 47 while ((de = readdir(dir.get())) != nullptr) { 48 if (*de->d_name == '.') { 49 continue; 50 } 51 52 int fd = atoi(de->d_name); 53 std::string path = fd_dir_name + "/" + std::string(de->d_name); 54 std::string target; 55 if (android::base::Readlink(path, &target)) { 56 list->emplace_back(fd, target); 57 } else { 58 ALOGE("failed to readlink %s: %s", path.c_str(), strerror(errno)); 59 list->emplace_back(fd, "???"); 60 } 61 } 62 } 63 64 void dump_open_files_list_to_log(const OpenFilesList& files, log_t* log, const char* prefix) { 65 for (auto& file : files) { 66 _LOG(log, logtype::OPEN_FILES, "%sfd %i: %s\n", prefix, file.first, file.second.c_str()); 67 } 68 } 69 70
