dmstack/dmstack/unwind/backtraces.cpp at main · DamengDB/dmstack · GitHub

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#include "unwind/backtraces.h"

#include "utils/signal_handler.h"

#include "utils/defer.h"

#include "log/log.h"

#include <dirent.h>

#include <sys/ptrace.h>

#include <sys/wait.h>

#include <sys/stat.h>

#include <libunwind.h>

#include <libunwind-ptrace.h>

#include <fstream>

void wait_info(int tid, int task_idx, int total_task, long long wait_count)

{

char line[128];

// 避免打印过于频繁

if (wait_count % 1000 == 0)

{

char bar[21];

int fill;

int i;

int percent = (total_task > 0) ? (int)((long long)task_idx * 100 / total_task) : 0;

if (percent < 0)

percent = 0;

if (percent > 100)

percent = 100;

fill = percent * 20 / 100;

for (i = 0; i < 20; i++)

bar[i] = (i < fill) ? '#' : '-';

bar[20] = '\0';

snprintf(line, sizeof(line),

"T%-5d [%-20s] %3d%% %4d/%4d",

tid, bar, percent, task_idx, total_task);

// 固定整行输出宽度，

fprintf(stderr, "\r%-80s\r", line);

fflush(stderr);

}

BackTraces::BackTraces(std::unordered_map<int, std::string>& tasks): error_code_(0)

{

int rc = 0;

int task_idx = 0;

int total_task = tasks.size();

int w_pid = 0;

int status = 0;

int count = 0;

bts_.reserve(total_task);

do {

unw_addr_space_t addr_space = unw_create_addr_space(&_UPT_accessors, 0);

if (!addr_space)

{

rc = -1;

LOG(ERROR, "unw_create_addr_space failed");

break;

}

DEFER(if (addr_space) unw_destroy_addr_space(addr_space));

unw_set_caching_policy(addr_space, UNW_CACHE_GLOBAL);

for (auto &t: tasks)

{

// init local bt

BackTrace bt(t.first);

// reset wait info

rc = 0;

w_pid = 0;

status = 0;

count = 0;

task_idx++;

// break the loop while interrupt

if (utils::interrupt)

{

break;

}

// attach

rc = ptrace(PTRACE_ATTACH, t.first);

if (-1 == rc)

{

if (errno != ESRCH)

{

LOG(ERROR, "ptrace attach failed, tid: %d, err: %d, errmsg: %s",

t.first, errno, strerror(errno));

}

continue;

}

DEFER(ptrace(PTRACE_DETACH, t.first, 0, 0));

// wait stop

while (1)

{

w_pid = wait4(t.first, &status, __WALL | WNOHANG, NULL);

// no status change

if (0 == w_pid)

{

usleep(20);

wait_info(t.first, task_idx, total_task, count++);

continue;

}

if (-1 == w_pid)

{

// Interrupted system call, should retry

if (errno == EINTR)

{

continue;

}

rc = errno;

break;

}

else if (WIFEXITED(status) || WIFSIGNALED(status))

{

// no such process

rc = ESRCH;

break;

}

else if (WIFSTOPPED(status))

{

// successfully stopped

rc = 0;

break;

}

if (rc != 0)

{

LOG(ERROR, "wait %d failed, err: %d, errmsg: %s", t.first, rc, strerror(rc));

continue;

}

// unwind backtrace

struct UPT_info* upt_info = (struct UPT_info*)_UPT_create(t.first);

if (!upt_info)

{

LOG(WARN, "unw_create_addr_space failed");

rc = -1;

continue;

}

DEFER(_UPT_destroy(upt_info));

unw_cursor_t c;

unw_init_remote(&c, addr_space, upt_info);

do {

unw_word_t uip;

if ((rc = unw_get_reg(&c, UNW_REG_IP, &uip)) < 0)

{

LOG(WARN, "get reg failed, err: %d\n", rc);

break;

}

bt.addAddr(static_cast<int64_t>(uip));

} while ((rc = unw_step(&c)) > 0);

if (bt.addrs().size() > 0)

{

bts_.push_back(bt);

}

if (utils::interrupt) {

error_code_ = -1;

LOG(WARN, "interruption occurs, will exit...");

}

} while (0);

}

std::unordered_map<int, std::string> ThreadInfo::getThreads(int pid, bool thread_only)

{

std::unordered_map<int, std::string> thread_map;

std::string path = "/proc/" + std::to_string(pid) + "/task";

struct dirent* entry;

struct stat entry_stat;

auto getThreadName = [](int tid)

{

std::string path = "/proc/" + std::to_string(tid) + "/comm";

std::ifstream file(path);

if (!file.is_open())

return std::string("Unknown");

std::string name;

std::getline(file, name);

file.close();

return name;

};

if (thread_only)

{

std::string name = getThreadName(pid);

thread_map.emplace(pid, name);

return thread_map;

}

DIR* dir = opendir(path.c_str());

if (!dir)

{

LOG(ERROR, "Failed to open directory: %s", path.c_str());

return thread_map;

}

// 遍历 /proc/{pid}/task/ 目录，获取所有线程 TID

while ((entry = readdir(dir)) != nullptr)

{

std::string full_path = path + "/" + entry->d_name;

if (stat(full_path.c_str(), &entry_stat) == 0 &&

S_ISDIR(entry_stat.st_mode))

{

std::string dirName = entry->d_name;

if (dirName != "." && dirName != "..")

{

int tid = std::stoi(dirName);

std::string name = getThreadName(tid);

thread_map.emplace(tid, name);

}

closedir(dir);

return thread_map;

}

bool ThreadInfo::isPidStopped()

{

FILE* status_file;

char buf[100];

bool stopped = false;

snprintf(buf, sizeof(buf), "/proc/%d/status", (int)tid_);

status_file = fopen(buf, "r");

if (status_file != NULL)

{

int have_state = 0;

while (fgets(buf, sizeof(buf), status_file))

{

buf[strlen(buf) - 1] = '\0';

if (strncmp(buf, "State:", 6) == 0)

{

have_state = 1;

break;

}

if (have_state && strstr(buf, "T") != NULL)

{

LOG(WARN, "process %d %s", tid_, buf);

stopped = true;

}

fclose(status_file);

}

return stopped;

}

dmstack/dmstack/unwind/backtraces.cpp at main · DamengDB/dmstack · GitHub

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