text: /*
   *  Phusion Passenger - https://www.phusionpassenger.com/
   *  Copyright (c) 2010-2014 Phusion Holding B.V.
   *
   *  "Passenger", "Phusion Passenger" and "Union Station" are registered
   *  trademarks of Phusion Holding B.V.
   *
   *  Permission is hereby granted, free of charge, to any person obtaining a copy
   *  of this software and associated documentation files (the "Software"), to deal
   *  in the Software without restriction, including without limitation the rights
   *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   *  copies of the Software, and to permit persons to whom the Software is
   *  furnished to do so, subject to the following conditions:
   *
   *  The above copyright notice and this permission notice shall be included in
   *  all copies or substantial portions of the Software.
   *
   *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
   *  THE SOFTWARE.
   */
  
  /**
   * Touch all files in the server instance dir every 6 hours in order to prevent /tmp
   * cleaners from weaking havoc:
   * http://code.google.com/p/phusion-passenger/issues/detail?id=365
   */
  class InstanceDirToucher {
  private:
  	WorkingObjectsPtr wo;
  	oxt::thread *thr;
  
  	void
  	threadMain() {
  		while (!this_thread::interruption_requested()) {
  			syscalls::sleep(60 * 60);
  
  			begin_touch:
  
  			this_thread::disable_interruption di;
  			this_thread::disable_syscall_interruption dsi;
  			// Fork a process which touches everything in the server instance dir.
  			pid_t pid = syscalls::fork();
  			if (pid == 0) {
  				// Child
  				int prio, ret, e;
  
  				closeAllFileDescriptors(2);
  
  				// Make process nicer.
  				do {
  					prio = getpriority(PRIO_PROCESS, getpid());
  				} while (prio == -1 && errno == EINTR);
  				if (prio != -1) {
  					prio++;
  					if (prio > 20) {
  						prio = 20;
  					}
  					do {
  						ret = setpriority(PRIO_PROCESS, getpid(), prio);
  					} while (ret == -1 && errno == EINTR);
  				} else {
  					perror("getpriority");
  				}
  
  				do {
  					ret = chdir(wo->instanceDir->getPath().c_str());
  				} while (ret == -1 && errno == EINTR);
  				if (ret == -1) {
  					e = errno;
  					fprintf(stderr, "chdir(\"%s\") failed: %s (%d)\n",
  						wo->instanceDir->getPath().c_str(),
  						strerror(e), e);
  					fflush(stderr);
  					_exit(1);
  				}
  				restoreOomScore(agentsOptions);
  
  				execlp("/bin/sh", "/bin/sh", "-c", "find . | xargs touch", (char *) 0);
  				e = errno;
  				fprintf(stderr, "Cannot execute 'find . | xargs touch': %s (%d)\n",
  					strerror(e), e);
  				fflush(stderr);
  				_exit(1);
  			} else if (pid == -1) {
  				// Error
  				P_WARN("Could not touch the server instance directory because "
  					"fork() failed. Retrying in 2 minutes...");
  				this_thread::restore_interruption si(di);
  				this_thread::restore_syscall_interruption rsi(dsi);
  				syscalls::sleep(60 * 2);
  				goto begin_touch;
  			} else {
  				syscalls::waitpid(pid, NULL, 0);
  			}
  		}
  	}
  
  public:
  	InstanceDirToucher(const WorkingObjectsPtr &wo) {
  		this->wo = wo;
  		thr = new oxt::thread(boost::bind(&InstanceDirToucher::threadMain, this),
  			"Server instance dir toucher", 256 * 1024);
  	}
  
  	~InstanceDirToucher() {
  		thr->interrupt_and_join();
  		delete thr;
  	}
  };
  
  typedef boost::shared_ptr<InstanceDirToucher> InstanceDirToucherPtr;
  