如何从C++中获取Linux 中的SPID

#include<iostream>
#include <fstream>
#include<string>
#include <sstream>

int main() {
    int pid = getpid(); // 获取当前进程的PID

    // 打开/proc/[pid]/status文件
    std::stringstream ss;
    ss << "/proc/"<< pid << "/status";
    std::ifstream statusFile(ss.str());

    if (!statusFile.is_open()) {
        std::cerr << "无法打开/proc/[pid]/status文件"<< std::endl;
        return 1;
    }

    // 读取文件内容，查找SPID
    std::string line;
    while (std::getline(statusFile, line)) {
        if (line.find("SPID") != std::string::npos) {
            std::stringstream spidStream(line);
            std::string spidKey;
            int spidValue;
            spidStream >> spidKey >> spidValue;
            std::cout << "SPID: " << spidValue<< std::endl;
            break;
        }
    }

    statusFile.close();
    return 0;
}