在C++中获取后台shell命令的PID

#include <iostream>
#include <cstdio>
#include <cstring>

int main() {
    FILE* pipe = popen("your_shell_command & echo $!", "r");
    if (!pipe) {
        std::cerr << "Error executing shell command" << std::endl;
        return -1;
    }

    char buffer[128];
    std::string result = "";
    while (!feof(pipe)) {
        if (fgets(buffer, 128, pipe) != NULL)
            result += buffer;
    }

    pclose(pipe);

    // 提取PID
    size_t pos = result.find_first_of("\n");
    std::string pid = result.substr(0, pos);

    std::cout << "PID: " << pid << std::endl;

    return 0;
}