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
38void 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
64void 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