14c8c0765a
Test: Format-only changes; treehugger suffices. Change-Id: I23cde3f0bbcac13bef555d13514e922c79d5ad48
125 lines
3.7 KiB
C++
125 lines
3.7 KiB
C++
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <ctype.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <fts.h>
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#include <poll.h>
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#include <pwd.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <fstream>
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#include <unordered_set>
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#include <android-base/file.h>
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#include <android-base/logging.h>
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#include <android-base/parseint.h>
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#include <android-base/stringprintf.h>
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#include <android-base/strings.h>
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#include "Process.h"
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using android::base::StringPrintf;
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namespace android {
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namespace vold {
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static bool checkMaps(const std::string& path, const std::string& prefix) {
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bool found = false;
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std::ifstream infile(path);
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std::string line;
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while (std::getline(infile, line)) {
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std::string::size_type pos = line.find('/');
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if (pos != std::string::npos) {
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line = line.substr(pos);
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if (android::base::StartsWith(line, prefix)) {
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LOG(WARNING) << "Found map " << path << " referencing " << line;
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found = true;
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}
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}
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}
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return found;
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}
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static bool checkSymlink(const std::string& path, const std::string& prefix) {
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std::string res;
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if (android::base::Readlink(path, &res)) {
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if (android::base::StartsWith(res, prefix)) {
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LOG(WARNING) << "Found symlink " << path << " referencing " << res;
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return true;
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}
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}
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return false;
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}
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int KillProcessesWithOpenFiles(const std::string& prefix, int signal) {
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std::unordered_set<pid_t> pids;
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auto proc_d = std::unique_ptr<DIR, int (*)(DIR*)>(opendir("/proc"), closedir);
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if (!proc_d) {
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PLOG(ERROR) << "Failed to open proc";
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return -1;
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}
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struct dirent* proc_de;
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while ((proc_de = readdir(proc_d.get())) != nullptr) {
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// We only care about valid PIDs
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pid_t pid;
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if (proc_de->d_type != DT_DIR) continue;
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if (!android::base::ParseInt(proc_de->d_name, &pid)) continue;
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// Look for references to prefix
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bool found = false;
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auto path = StringPrintf("/proc/%d", pid);
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found |= checkMaps(path + "/maps", prefix);
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found |= checkSymlink(path + "/cwd", prefix);
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found |= checkSymlink(path + "/root", prefix);
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found |= checkSymlink(path + "/exe", prefix);
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auto fd_path = path + "/fd";
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auto fd_d = std::unique_ptr<DIR, int (*)(DIR*)>(opendir(fd_path.c_str()), closedir);
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if (!fd_d) {
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PLOG(WARNING) << "Failed to open " << fd_path;
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} else {
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struct dirent* fd_de;
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while ((fd_de = readdir(fd_d.get())) != nullptr) {
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if (fd_de->d_type != DT_LNK) continue;
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found |= checkSymlink(fd_path + "/" + fd_de->d_name, prefix);
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}
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}
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if (found) {
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pids.insert(pid);
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}
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}
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if (signal != 0) {
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for (const auto& pid : pids) {
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LOG(WARNING) << "Sending " << strsignal(signal) << " to " << pid;
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kill(pid, signal);
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}
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}
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return pids.size();
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}
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} // namespace vold
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} // namespace android
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