129 lines
3.6 KiB
C++
129 lines
3.6 KiB
C++
/*
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* Copyright (C) 2016 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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#pragma once
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#include <dirent.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <memory>
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#include <string>
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#include <type_traits>
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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/unique_fd.h>
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namespace android {
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namespace procinfo {
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#if defined(__linux__)
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enum ProcessState {
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kProcessStateUnknown,
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kProcessStateRunning,
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kProcessStateSleeping,
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kProcessStateUninterruptibleWait,
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kProcessStateStopped,
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kProcessStateZombie,
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};
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struct ProcessInfo {
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std::string name;
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ProcessState state;
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pid_t tid;
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pid_t pid;
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pid_t ppid;
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pid_t tracer;
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uid_t uid;
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uid_t gid;
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// Start time of the process since boot, measured in clock ticks.
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uint64_t starttime;
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};
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// Parse the contents of /proc/<tid>/status into |process_info|.
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bool GetProcessInfo(pid_t tid, ProcessInfo* process_info, std::string* error = nullptr);
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// Parse the contents of <fd>/status into |process_info|.
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// |fd| should be an fd pointing at a /proc/<pid> directory.
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bool GetProcessInfoFromProcPidFd(int fd, ProcessInfo* process_info, std::string* error = nullptr);
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// Fetch the list of threads from a given process's /proc/<pid> directory.
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// |fd| should be an fd pointing at a /proc/<pid> directory.
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template <typename Collection>
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auto GetProcessTidsFromProcPidFd(int fd, Collection* out, std::string* error = nullptr) ->
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typename std::enable_if<sizeof(typename Collection::value_type) >= sizeof(pid_t), bool>::type {
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out->clear();
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int task_fd = openat(fd, "task", O_DIRECTORY | O_RDONLY | O_CLOEXEC);
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std::unique_ptr<DIR, int (*)(DIR*)> dir(fdopendir(task_fd), closedir);
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if (!dir) {
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if (error != nullptr) {
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*error = "failed to open task directory";
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}
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return false;
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}
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struct dirent* dent;
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while ((dent = readdir(dir.get()))) {
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if (strcmp(dent->d_name, ".") != 0 && strcmp(dent->d_name, "..") != 0) {
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pid_t tid;
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if (!android::base::ParseInt(dent->d_name, &tid, 1, std::numeric_limits<pid_t>::max())) {
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if (error != nullptr) {
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*error = std::string("failed to parse task id: ") + dent->d_name;
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}
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return false;
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}
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out->insert(out->end(), tid);
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}
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}
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return true;
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}
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template <typename Collection>
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auto GetProcessTids(pid_t pid, Collection* out, std::string* error = nullptr) ->
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typename std::enable_if<sizeof(typename Collection::value_type) >= sizeof(pid_t), bool>::type {
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char task_path[PATH_MAX];
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if (snprintf(task_path, PATH_MAX, "/proc/%d", pid) >= PATH_MAX) {
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if (error != nullptr) {
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*error = "task path overflow (pid = " + std::to_string(pid) + ")";
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}
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return false;
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}
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android::base::unique_fd fd(open(task_path, O_DIRECTORY | O_RDONLY | O_CLOEXEC));
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if (fd == -1) {
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if (error != nullptr) {
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*error = std::string("failed to open ") + task_path;
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}
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return false;
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}
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return GetProcessTidsFromProcPidFd(fd.get(), out, error);
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}
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#endif
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} /* namespace procinfo */
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} /* namespace android */
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