void ACEApp::write_pid_file()
{
string pid_file_path = program_;
pid_file_path += ".pid";
pid_file_path = "./" + pid_file_path;
ACE_DEBUG((LM_INFO, "[%D] write pid file %s\n", pid_file_path.c_str()));
ofstream pid_file(pid_file_path.c_str());
pid_file << ACE_OS::getpid();
pid_file.close();
}
bool Sentinel::is_process_dead(const std::string& pid_path) {
std::ifstream pid_file(pid_path.c_str());
if (pid_file.fail())
return false; // if pid file does not exist, the process was most
// likely intentionally stopped, report no issues
std::string pid_str;
std::getline(pid_file, pid_str);
pid_file.close();
int pid;
try {
pid = std::stoi(pid_str);
} catch (const std::invalid_argument&) {
return true;
} catch (const std::out_of_range&) {
return true;
}
// sending the ``0`` signal to any pid just checks if the process is alive
return kill(pid, SIGNAL_CHECK) != ALIVE;
}