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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <dirent.h>
#include <fcntl.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include <memory>
#include <string>
#include <type_traits>
#include <android-base/logging.h>
#include <android-base/parseint.h>
#include <android-base/unique_fd.h>
namespace android {
namespace procinfo {
#if defined(__linux__)
enum ProcessState {
kProcessStateUnknown,
kProcessStateRunning,
kProcessStateSleeping,
kProcessStateUninterruptibleWait,
kProcessStateStopped,
kProcessStateZombie,
};
struct ProcessInfo {
std::string name;
ProcessState state;
pid_t tid;
pid_t pid;
pid_t ppid;
pid_t tracer;
uid_t uid;
uid_t gid;
};
// Parse the contents of /proc/<tid>/status into |process_info|.
bool GetProcessInfo(pid_t tid, ProcessInfo* process_info, std::string* error = nullptr);
// Parse the contents of <fd>/status into |process_info|.
// |fd| should be an fd pointing at a /proc/<pid> directory.
bool GetProcessInfoFromProcPidFd(int fd, ProcessInfo* process_info, std::string* error = nullptr);
// Fetch the list of threads from a given process's /proc/<pid> directory.
// |fd| should be an fd pointing at a /proc/<pid> directory.
template <typename Collection>
auto GetProcessTidsFromProcPidFd(int fd, Collection* out, std::string* error = nullptr) ->
typename std::enable_if<sizeof(typename Collection::value_type) >= sizeof(pid_t), bool>::type {
out->clear();
int task_fd = openat(fd, "task", O_DIRECTORY | O_RDONLY | O_CLOEXEC);
std::unique_ptr<DIR, int (*)(DIR*)> dir(fdopendir(task_fd), closedir);
if (!dir) {
if (error != nullptr) {
*error = "failed to open task directory";
}
return false;
}
struct dirent* dent;
while ((dent = readdir(dir.get()))) {
if (strcmp(dent->d_name, ".") != 0 && strcmp(dent->d_name, "..") != 0) {
pid_t tid;
if (!android::base::ParseInt(dent->d_name, &tid, 1, std::numeric_limits<pid_t>::max())) {
if (error != nullptr) {
*error = std::string("failed to parse task id: ") + dent->d_name;
}
return false;
}
out->insert(out->end(), tid);
}
}
return true;
}
template <typename Collection>
auto GetProcessTids(pid_t pid, Collection* out, std::string* error = nullptr) ->
typename std::enable_if<sizeof(typename Collection::value_type) >= sizeof(pid_t), bool>::type {
char task_path[PATH_MAX];
if (snprintf(task_path, PATH_MAX, "/proc/%d", pid) >= PATH_MAX) {
if (error != nullptr) {
*error = "task path overflow (pid = " + std::to_string(pid) + ")";
}
return false;
}
android::base::unique_fd fd(open(task_path, O_DIRECTORY | O_RDONLY | O_CLOEXEC));
if (fd == -1) {
if (error != nullptr) {
*error = std::string("failed to open ") + task_path;
}
return false;
}
return GetProcessTidsFromProcPidFd(fd.get(), out, error);
}
#endif
} /* namespace procinfo */
} /* namespace android */
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