C++ Daemon类代码示例

/**
 *
 * @param argc
 * @param argv
 * @return
 */
int main(int argc, char** argv) {
    bool foreground = false;
    
    // TODO: Check for foreground flag
    // TODO: Add other flags
    // Check startup flags
    try {
        po::options_description desc("Allowed options");
        desc.add_options()
            ("help,h", "Display this message")
            ("version,v", "Display version information")
            ("foreground,f", "Run in foreground, logging errors to console")
            ;
        
        po::variables_map vm;
        po::store(po::parse_command_line(argc, argv, desc), vm);
        po::notify(vm);

        // Display help message
        if (vm.count("help")) {
            cout << desc << "\n";
            return 0;
        }
        
        // Display version information
        if (vm.count("version")) {
            printf("[%s] - Version %s\n", argv[0], VERSION);
            return 0;
        }
        
        if (vm.count("fg")) {
            foreground = true;
        }

        
    } catch (exception &e) {
        printf("[%s] Exception caught getting options: %s\n", argv[0], e.what());
        return 1;   
    }

    // Fork to background, if we weren't told not to do it
    if (!foreground) {       
        fork();
    }
    
    // Setup logging
    openlog("tievox", LOG_PERROR | LOG_PID | LOG_CONS, LOG_DAEMON);
    
    // Setup wiringPi, using physical pin numbers.
    wiringPiSetupPhys();
    
    // Run daemon
    Daemon *daemon = new Daemon();
    int result = daemon->Run();
    
    // Cleanup after ourselves
    closelog();
    
    return result;
}

int main() {
    Daemon d;
    if(d.isUnique()) {
        daemon(0, 0);
        d.run();
    }
    return 0;
}

 void *daemon_launch_thread_(void *arg) {
     Daemon *d = (Daemon *)arg;
     dprintf(DBG_MINOR, "Dummy::Sensor: Launching dummy simulator thread\n");
     d->running = true;
     d->run();
     d->running = false;
     pthread_exit(NULL);
     return NULL;
 }

int
CollectorList::resortLocal( const char *preferred_collector )
{
		// Find the collector in the list that is best suited for 
		// this host. This is determined either by
		// a) preferred_collector passed in
        // b) the collector that has the same hostname as this negotiator
	char * tmp_preferred_collector = NULL;

	if ( !preferred_collector ) {
        // figure out our hostname for plan b) above
		MyString _hostname_str = get_local_fqdn();
		const char * _hostname = _hostname_str.Value();
		if (!(*_hostname)) {
				// Can't get our hostname??? fuck off
			return -1;
		}

		tmp_preferred_collector = strdup(_hostname);
		preferred_collector = tmp_preferred_collector; // So we know to free later
	}


		// First, pick out collector(s) that is on this host
	Daemon *daemon;
	SimpleList<Daemon*> prefer_list;
	this->list.Rewind();
	while ( this->list.Next(daemon) ) {
		if ( same_host (preferred_collector, daemon->fullHostname()) ) {
			this->list.DeleteCurrent();
			prefer_list.Prepend( daemon );
		}
	}

		// Walk through the list of preferred collectors,
		// stuff 'em in the main "list"
	this->list.Rewind();
	prefer_list.Rewind();
	while ( prefer_list.Next(daemon) ) {
		this->list.Prepend( daemon );
	}
	
	free(tmp_preferred_collector); // Warning, preferred_collector (may have) just became invalid, so do this just before returning.
	return 0;
}

int main(int argc, char *argv[]) {
    QApplication a(argc, argv);

    //listenStatus = 1;
    //if (localPortIsOpen(QHostAddress::LocalHost,9250) || localPortIsOpen(QHostAddress::LocalHost,9251)) torStatus = -1;
    //if (localPortIsOpen(QHostAddress::Any, 445)) listenStatus = 0;

    //Database::db = new QSqlDatabase(QSqlDatabase::addDatabase("QSQLITE"));
    //Database::db->setDatabaseName("db.sqlite");
    //Database::setDB();

    QThread *thread = new QThread;
    Daemon *Tor = new Daemon;
    Tor->moveToThread(thread);
    QObject::connect(thread, SIGNAL(started()), Tor, SLOT(startTor()));
    QObject::connect(Tor, SIGNAL(finished()), thread, SLOT(quit()), Qt::DirectConnection);
    QObject::connect(thread, SIGNAL(finished()), Tor, SLOT(deleteLater()));
    QObject::connect(thread, SIGNAL(finished()), thread, SLOT(deleteLater()));
    thread->start();

    QThread *thread2 = new QThread;
    Daemon *daemon = new Daemon;
    daemon->moveToThread(thread2);
    QObject::connect(thread2, SIGNAL(started()), daemon, SLOT(startListener()));
    QObject::connect(daemon, SIGNAL(ListenerStarted()), daemon, SLOT(init()));
    QObject::connect(daemon, SIGNAL(finished()), thread2, SLOT(quit()), Qt::DirectConnection);
    QObject::connect(thread2, SIGNAL(finished()), daemon, SLOT(deleteLater()));
    QObject::connect(thread2, SIGNAL(finished()), thread2, SLOT(deleteLater()));
    thread2->start();

    QThread *thread3 = new QThread;
    JobsManager *jobsmanager = new JobsManager;
    QObject::connect(thread3, SIGNAL(started()), jobsmanager, SLOT(worker()));
    jobsmanager->moveToThread(thread3);
    thread3->start();

    Dialog *dialog = new Dialog();
    dialog->show();
    QTimer::singleShot(4000, dialog, SLOT(hide()));
    Systray *systray = new Systray();
    QObject::connect(systray, SIGNAL(exit()), &a, SLOT(quit()));
    QObject::connect(jobsmanager, SIGNAL(update()), systray, SLOT(update()));
    return a.exec();
}

void* Daemon::entry(void* data){
	struct sync* td = (struct sync*)data;
	Daemon* daemon = td->daemon;

	/* setup self-pipe */
	if ( pipe2(daemon->pipe, O_NONBLOCK) != 0 ){
		int saved = errno;
		Log::fatal("main", "pipe2() returned %d: %s\n", saved, strerror(saved));
		td->value = saved;
		sem_post(&td->semaphore);
		return NULL;
	}

	td->value = daemon->init();
	sem_post(&td->semaphore);

	if ( td->value != 0 ){
		return NULL;
	}

	if ( td->barrier ){
		pthread_barrier_wait(td->barrier);
	}

	daemon->run();
	daemon->cleanup();

	/* close pipe */
	close(daemon->pipe[0]);
	close(daemon->pipe[1]);

	/* free resources */
	sem_destroy(&td->semaphore);
	free(td);

	return 0;
}

int main(int argc, char **argv) {
#ifdef DAEMON
	/* отделяемся от родительского процесса */
	int pid = fork();

	switch (pid) {
		case 0: // child
		{
 			umask(0);	//777
			setsid();	// Создание нового SID для дочернего процесса

			/*Закрываем стандартные файловые дескрипторы*/
			close (STDIN_FILENO);
			close (STDOUT_FILENO);
			close (STDERR_FILENO);

			signal(SIGHUP, signal_handler);
			signal(SIGTERM, signal_handler);
			openlog("daemon", LOG_CONS | LOG_PID | LOG_NDELAY, LOG_LOCAL1);
#endif

// CODE
			dmn = Daemon();
			dmn.start();
			exit(0);

#ifdef DAEMON
	break;
}
case -1: // error!
	exit(EXIT_FAILURE);
/*Если с PID ’ ом в с е получилось , то родительский процесс можно завершить .*/
default:// parent
	return 0;
}
#endif
}

int main( int argc, char *argv[] )
{
	char *machine_name = 0;
	char *log_name = 0;
	char *pool=0;
	int i;

	daemon_t type = DT_MASTER;

	myDistro->Init( argc, argv );
	config();

	for( i=1; i<argc; i++ ) {
		if(!strcmp(argv[i],"-help")) {
			usage(argv[0]);
			exit(0);
		} else if(!strcmp(argv[i],"-pool")) {	
			i++;
			if(!argv[i]) {
				fprintf(stderr,"-pool requires an argument.\n\n");
				usage(argv[0]);
				exit(1);
			}
			pool = argv[i];
		} else if(!strcmp(argv[i],"-version")) {
			version();
			exit(0);
		} else if(!strcmp(argv[i],"-debug")) {
            dprintf_set_tool_debug("TOOL", 0);
		} else if(argv[i][0]=='-') {
			type = stringToDaemonType(&argv[i][1]);
			if( type == DT_NONE || type == DT_DAGMAN) {
				usage(argv[0]);
				exit(1);
			}
		} else if(argv[i][0]!='-') {
			if(!machine_name) {
				machine_name = argv[i];
			} else if(!log_name) {
				log_name = argv[i];
			} else {
				fprintf(stderr,"Extra argument: %s\n\n",argv[i]);
				usage(argv[0]);
				exit(1);
			}
		} else {
			usage(argv[0]);
			exit(1);
		}
	}

	if( !machine_name || !log_name ) {
		usage(argv[0]);
		exit(1);
	}

	Daemon *daemon;
	ReliSock *sock;

	if (pool) {
		DCCollector col( pool );
		if( ! col.addr() ) {
			fprintf( stderr, "Error: %s\n", col.error() );
			exit(1);
		}
		daemon = new Daemon( type, machine_name, col.addr() );
	} else {
		daemon = new Daemon( type, machine_name );
	}

		
	dprintf(D_FULLDEBUG,"Locating daemon process on %s...\n",machine_name);

	if(!daemon->locate()) {
		fprintf(stderr,"Couldn't locate daemon on %s: %s\n",machine_name,daemon->error());
		exit(1);
	}

	dprintf(D_FULLDEBUG,"Daemon %s is %s\n",daemon->hostname(),daemon->addr());
	
	sock = (ReliSock*)daemon->startCommand( DC_FETCH_LOG, Sock::reli_sock);

	if(!sock) {
		fprintf(stderr,"couldn't connect to daemon %s at %s\n",daemon->hostname(),daemon->addr());
		return 1;
	}

	int commandType = DC_FETCH_LOG_TYPE_PLAIN;
	if ((strcmp(log_name, "HISTORY") == 0) || (strcmp(log_name, "STARTD_HISTORY") == 0)) {
		commandType = DC_FETCH_LOG_TYPE_HISTORY;
	}

	if ((strcmp(log_name, "STARTD.PER_JOB_HISTORY_DIR") == 0) || (strcmp(log_name, "STARTD.PER_JOB_HISTORY_DIR") == 0)) {
		commandType = DC_FETCH_LOG_TYPE_HISTORY_DIR;
	}

	sock->put( commandType );
	sock->put( log_name );
	sock->end_of_message();

//.........这里部分代码省略.........

//.........这里部分代码省略.........
			dashAttributes.rewind();
			while ((s = dashAttributes.next())) {
				projList.AppendArg(s);
			}
		}
	}

	if( projList.Count() > 0 ) {
		char **attr_list = projList.GetStringArray();
		query->setDesiredAttrs(attr_list);
		deleteStringArray(attr_list);
	}

	// if diagnose was requested, just print the query ad
	if (diagnose) {
		ClassAd 	queryAd;

		// print diagnostic information about inferred internal state
		setMode ((Mode) 0, 0, NULL);
		setType (NULL, 0, NULL);
		setPPstyle ((ppOption) 0, 0, DEFAULT);
		printf ("----------\n");

		q = query->getQueryAd (queryAd);
		fPrintAd (stdout, queryAd);

		printf ("----------\n");
		fprintf (stderr, "Result of making query ad was:  %d\n", q);
		exit (1);
	}

        // Address (host:port) is taken from requested pool, if given.
	char* addr = (NULL != pool) ? pool->addr() : NULL;
        Daemon* requested_daemon = pool;

        // If we're in "direct" mode, then we attempt to locate the daemon
	// associated with the requested subsystem (here encoded by value of mode)
        // In this case the host:port of pool (if given) denotes which
        // pool is being consulted
	if( direct ) {
		Daemon *d = NULL;
		switch( mode ) {
		case MODE_MASTER_NORMAL:
			d = new Daemon( DT_MASTER, direct, addr );
			break;
		case MODE_STARTD_NORMAL:
		case MODE_STARTD_AVAIL:
		case MODE_STARTD_RUN:
		case MODE_STARTD_COD:
			d = new Daemon( DT_STARTD, direct, addr );
			break;

#ifdef HAVE_EXT_POSTGRESQL
		case MODE_QUILL_NORMAL:
			d = new Daemon( DT_QUILL, direct, addr );
			break;
#endif /* HAVE_EXT_POSTGRESQL */

		case MODE_SCHEDD_NORMAL:
		case MODE_SCHEDD_SUBMITTORS:
			d = new Daemon( DT_SCHEDD, direct, addr );
			break;
		case MODE_NEGOTIATOR_NORMAL:
			d = new Daemon( DT_NEGOTIATOR, direct, addr );
			break;
		case MODE_CKPT_SRVR_NORMAL:

int
Globals::run(int argc, char * * argv)

{
	Daemon daemon;
	char * cp;
	char * sockarg;

	name(FilePath(argv[0]).filename());

	//	Parse arguments.

	config = FilePath("/etc") + name();

	for (;;) {
		cp = *++argv;

		if (!--argc || *cp != '-' || !cp[1])
			break;

		while (*++cp)
			switch (*cp) {

			case 'c':	// Configuration file.
				if (!--argc)
					usage();

				config = *++argv;
				break;

			case 'd':	// Increase debug level.
				debuglvl++;
				break;

			case 'e':		// Log to stderr only.
				stderrOnly = true;
				break;

			case 'g':		// Group.
				if (!--argc)
					usage();

				group = *++argv;
				break;

			case 'j':		// Jail.
				if (!--argc)
					usage();

				jail = *++argv;
				break;

			case 'l':		// Log to stderr too.
				logstd = true;
				break;

			case 'n':		// Do not detach.
				nodaemon = true;
				break;


			case 'u':		// User.
				if (!--argc)
					usage();

				user = *++argv;
				break;

			default:
				usage();
				}
		}

	if (!cp)
		usage();
	else if (--argc)
		usage();

	sockarg = cp;

	//	Daemonize.
	//	Do not change user and/or group now, since we need full
	//		permissions for sockets.

	try {
		daemon.program(name());
		daemon.lock_file(FilePath(LOCKDIR) + daemon.program());
		daemon.pid_file(FilePath(RUNDIR) + (daemon.program() + ".pid"));
		daemon.user(user);
		daemon.group(group);
		daemon.log_to_stderr(logstd);
		daemon.jail(jail);
		daemon.block_signals();
		daemon.ignore_signals();

		if (!nodaemon)
			daemon.detach();

		daemon.close_all(!stderrOnly);
		daemon.open_log(LOG_PID | LOG_NDELAY, LOG_MAIL);
//.........这里部分代码省略.........

int main( int argc, char *argv[] )
{
	char *pool=0;
	char *name=0;
	char *address=0;
	char *optional_config=0;
	int  output_mode = -1;
	daemon_t dtype = DT_NONE;
	int i;

	ExtArray<MyString> worklist_name;
	ExtArray<int> worklist_number;
	int worklist_count = 0;
	Daemon * daemon = NULL;

	myDistro->Init( argc, argv );
	config();

	for( i=1; i<argc; i++ ) {
		if(!strncmp(argv[i],"-help",strlen(argv[i]))) {
			usage(argv[0]);
			exit(0);
		} else if(!strncmp(argv[i],"-quiet",strlen(argv[i]))) {	
			if(output_mode == -1) {
				output_mode = 0;
			} else {
				fprintf(stderr,"ERROR: only one output mode may be specified.\n\n");
				usage(argv[0]);
				exit(1);
			}
		} else if(!strncmp(argv[i],"-table",strlen(argv[i]))) {	
			if(output_mode == -1) {
				output_mode = 10;
			} else {
				fprintf(stderr,"ERROR: only one output mode may be specified.\n\n");
				usage(argv[0]);
				exit(1);
			}
		} else if(!strncmp(argv[i],"-verbose",strlen(argv[i]))) {	
			if(output_mode == -1) {
				output_mode = 2;
			} else {
				fprintf(stderr,"ERROR: only one output mode may be specified.\n\n");
				usage(argv[0]);
				exit(1);
			}
		} else if(!strncmp(argv[i],"-config",strlen(argv[i]))) {	
			i++;
			if(!argv[i]) {
				fprintf(stderr,"ERROR: -config requires an argument.\n\n");
				usage(argv[0]);
				exit(1);
			}
			optional_config = argv[i];
		} else if(!strncmp(argv[i],"-pool",strlen(argv[i]))) {	
			i++;
			if(!argv[i]) {
				fprintf(stderr,"ERROR: -pool requires an argument.\n\n");
				usage(argv[0]);
				exit(1);
			}
			if(address) {
				fprintf(stderr,"ERROR: -address cannot be used with -pool or -name.\n\n");
				usage(argv[0]);
				exit(1);
			}
			pool = argv[i];
		} else if(!strncmp(argv[i],"-name",strlen(argv[i]))) {	
			i++;
			if(!argv[i]) {
				fprintf(stderr,"ERROR: -name requires an argument.\n\n");
				usage(argv[0]);
				exit(1);
			}
			if(address) {
				fprintf(stderr,"ERROR: -address cannot be used with -pool or -name.\n\n");
				usage(argv[0]);
				exit(1);
			}
			name = argv[i];
		} else if(!strncmp(argv[i],"-type",strlen(argv[i]))) {	
			i++;
			if(!argv[i]) {
				fprintf(stderr,"ERROR: -type requires an argument.\n\n");
				usage(argv[0]);
				exit(1);
			}
			dtype = stringToDaemonType(argv[i]);
			if( dtype == DT_NONE) {
				fprintf(stderr,"ERROR: unrecognized daemon type: %s\n\n", argv[i]);
				usage(argv[0]);
				exit(1);
			}
		} else if(!strncmp(argv[i],"-address",strlen(argv[i]))) {	
			i++;
			if(!argv[i]) {
				fprintf(stderr,"ERROR: -address requires an argument.\n\n");
				usage(argv[0]);
				exit(1);
			}
//.........这里部分代码省略.........

int main(int argc, char **argv) {
    openni::Device &device = __device;
    openni::VideoStream &depth = __depth, &color = __color;
    openni::Status rc;

    char *prefix = strrchr(argv[0], '/')+1;
    char *cfgfile = new char[prefix-argv[0]+strlen(rgbdsend::config_file_name)+1];

    strncpy(cfgfile, argv[0], prefix-argv[0]+1);
    strcpy(cfgfile+(prefix-argv[0]), rgbdsend::config_file_name);

    Config conf;
    if(conf.read(cfgfile) != 1) {
        printf("Config: Falling back to builtin presets.\n");
        conf.setDefaults();
    }

    delete[] cfgfile;

    CURL *curl = init_curl();

    Daemon daemon;
    daemon.init(conf.daemon_port, conf.daemon_timeout);

    atexit(atexit_handler);

    init_openni(&device, &depth, &color, conf);

    int dw, dh, cw, ch;
    int tmp1, tmp2;

    if(!depth.getCropping(&tmp1, &tmp2, &dw, &dh)) {
        dw = depth.getVideoMode().getResolutionX();
        dh = depth.getVideoMode().getResolutionY();
    }

    if(!color.getCropping(&tmp1, &tmp2, &cw, &ch)) {
        cw = color.getVideoMode().getResolutionX();
        ch = color.getVideoMode().getResolutionY();
    }

    printf("Resolution:\nDepth: %dx%d @ %d fps\nColor: %dx%d @ %d fps\n",
           dw, dh, depth.getVideoMode().getFps(),
           cw, ch, color.getVideoMode().getFps());

    std::queue<char *> onilist;

    Command cmd;
    while(1) {
        timeval t;
        t.tv_sec = conf.daemon_timeout;
        t.tv_usec = 0;

        fd_set fds;
        FD_ZERO(&fds);
        FD_SET(daemon.sock, &fds);
        FD_SET(daemon.csock, &fds);

        int in = select((daemon.csock > daemon.sock ? daemon.csock : daemon.sock)+1, &fds, 0, 0, &t);

        if(FD_ISSET(daemon.sock, &fds))
            daemon.acceptConnection();

        if(FD_ISSET(daemon.csock, &fds)) {
            char b[5];
            int r = daemon.receiveCommand(&cmd);

            if(r == 0) {
                printf("Daemon Error: Could not receive command.\n");

                daemon.closeConnection();
                continue;
            }

            if(r == 2) // keep alive
                continue;

            if(strncmp(cmd.header, "capt", 4) == 0) {
                printf("Received capture command.\n");

                char *newfile = new char[rgbdsend::filename_bufsize];
                if(record_oni(newfile, rgbdsend::filename_bufsize, depth, color, conf) == true) {
                    onilist.push(newfile);
                } else {
                    delete[] newfile;
                }
                daemon.sendCommand("okay", 0, 0);
            } else if(strncmp(cmd.header, "thmb", 4) == 0) {
                printf("Received thumbnail command.\n");
                unsigned char *thumbbuf = NULL;
                long unsigned int size = 0;
                capture_thumbnail(&thumbbuf, &size, color);
                printf("Captured thumbnail. %ld bytes\n", size);

                daemon.sendCommand("stmb", thumbbuf, size);

//				delete[] thumbbuf; seems like libjpeg handles this. but I'm not sure.
            } else if(strncmp(cmd.header, "quit", 4) == 0) {
                daemon.closeConnection();
            } else {
//.........这里部分代码省略.........

int main(int argc, char *argv[])
{
  Daemon *app = new Daemon(argc, argv);
  return app->run();
}

void signal_handler(int sig) {
	switch (sig) {
	case SIGHUP:
		dmn.reup();
		break;
	case SIGTERM:
		dmn.die();
		break;
	}
}

void signal_handler(int sig) {
	switch (sig) {
	case SIGHUP:
		syslog(LOG_INFO, "Reload conf file\n");
		break;
	case SIGTERM:
		syslog(LOG_INFO, "Close daemon...\n");
		dmn.die();
		break;
	}
}