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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "procfs_utils.h"
#include <stdio.h>
#include <string.h>
#include "file_utils.h"
#include "logging.h"
using file_utils::ForEachPidInProcPath;
using file_utils::ReadProcFile;
using file_utils::ReadProcFileTrimmed;
namespace procfs_utils {
namespace {
const char kJavaAppPrefix[] = "/system/bin/app_process";
const char kZygotePrefix[] = "zygote";
inline void ReadProcString(int pid, const char* path, char* buf, size_t size) {
if (!file_utils::ReadProcFileTrimmed(pid, path, buf, size))
buf[0] = '\0';
}
inline void ReadExePath(int pid, char* buf, size_t size) {
char exe_path[64];
sprintf(exe_path, "/proc/%d/exe", pid);
ssize_t res = readlink(exe_path, buf, size - 1);
if (res >= 0)
buf[res] = '\0';
else
buf[0] = '\0';
}
inline bool IsApp(const char* name, const char* exe) {
return strncmp(exe, kJavaAppPrefix, sizeof(kJavaAppPrefix) - 1) == 0 &&
strncmp(name, kZygotePrefix, sizeof(kZygotePrefix) - 1) != 0;
}
} // namespace
int ReadTgid(int pid) {
static const char kTgid[] = "\nTgid:";
char buf[512];
ssize_t rsize = ReadProcFile(pid, "status", buf, sizeof(buf));
if (rsize <= 0)
return -1;
const char* tgid_line = strstr(buf, kTgid);
CHECK(tgid_line);
return atoi(tgid_line + sizeof(kTgid) - 1);
}
std::unique_ptr<ProcessInfo> ReadProcessInfo(int pid) {
ProcessInfo* process = new ProcessInfo();
process->pid = pid;
ReadProcString(pid, "cmdline", process->name, sizeof(process->name));
if (process->name[0] != 0) {
ReadExePath(pid, process->exe, sizeof(process->exe));
process->is_app = IsApp(process->name, process->exe);
} else {
ReadProcString(pid, "comm", process->name, sizeof(process->name));
CHECK(process->name[0]);
process->in_kernel = true;
}
return std::unique_ptr<ProcessInfo>(process);
}
void ReadProcessThreads(ProcessInfo* process) {
if (process->in_kernel)
return;
char tasks_path[64];
sprintf(tasks_path, "/proc/%d/task", process->pid);
ForEachPidInProcPath(tasks_path, [process](int tid) {
if (process->threads.count(tid))
return;
ThreadInfo thread = { tid, "" };
char task_comm[64];
sprintf(task_comm, "task/%d/comm", tid);
ReadProcString(process->pid, task_comm, thread.name, sizeof(thread.name));
if (thread.name[0] == '\0' && process->is_app)
strcpy(thread.name, "UI Thread");
process->threads[tid] = thread;
});
}
bool ReadOomStats(ProcessSnapshot* snapshot) {
char buf[64];
if (ReadProcFileTrimmed(snapshot->pid, "oom_score", buf, sizeof(buf)))
snapshot->oom_score = atoi(buf);
else
return false;
if (ReadProcFileTrimmed(snapshot->pid, "oom_score_adj", buf, sizeof(buf)))
snapshot->oom_score_adj = atoi(buf);
else
return false;
return true;
}
bool ReadPageFaultsAndCpuTimeStats(ProcessSnapshot* snapshot) {
char buf[512];
if (!ReadProcFileTrimmed(snapshot->pid, "stat", buf, sizeof(buf)))
return false;
int ret = sscanf(buf,
"%*d (%*[^)]) %*c %*d %*d %*d %*d %*d %*u %lu %*lu %lu %*lu %lu %lu",
&snapshot->minor_faults, &snapshot->major_faults,
&snapshot->utime, &snapshot->stime);
CHECK(ret == 4);
return true;
}
bool ReadMemInfoStats(std::map<std::string, uint64_t>* mem_info) {
char buf[1024];
ssize_t rsize = file_utils::ReadFile("/proc/meminfo", buf, sizeof(buf));
if (rsize <= 0)
return false;
file_utils::LineReader reader(buf, rsize);
for (const char* line = reader.NextLine();
line && line[0];
line = reader.NextLine()) {
const char* pos_colon = strstr(line, ":");
if (pos_colon == nullptr)
continue; // Should not happen.
std::string name(line, pos_colon - line);
(*mem_info)[name] = strtoull(&pos_colon[1], nullptr, 10);
}
return true;
}
} // namespace procfs_utils
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