Linux中獲取當前進程的絕對路徑

• 通過readlink的方式獲取。

bool GetExePath(std::string &path)
{
    std::string exe_path(PATH_MAX, std::string::value_type());
    auto exe_path_len = readlink("/proc/self/exe", &exe_path[0], exe_path.size());
    if (exe_path_len < 0) {
        std::cerr << "readlink failed!, exe_path_len < 0"<< std::endl;
        return false;
    } else if (static_cast<size_t>(exe_path_len) >= exe_path.size()) {
        std::cerr << "readlink failed!, exe_path_len >= exe_path.size()"<< std::endl;
        return false;
    }

    exe_path.resize(exe_path_len);
    auto pos = exe_path.rfind('/');
    if (pos == std::string::npos) {
        std::cerr << "exe_path.rfind fail!, exe_path.rfind = npos"<< std::endl;
        return false;
    }
    path = exe_path.substr(0, pos);
    return true;
}