# Based on code from <http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/66012># Eventually (read: probably never) I'll rewrite this myself, so that it's not cookie-cutter code.import sys, os, timefrom signal import SIGTERMdef startstop(action, stdout='/dev/null', stderr=None, stdin='/dev/null', pidfile='pid.txt', startmsg = 'Started with pid %s' ): try: pf = file(pidfile,'r') pid = int(pf.read().strip()) pf.close() except IOError: pid = None if 'stop' == action or 'restart' == action: if not pid: mess = "Could not stop, pid file '%s' missing.\n" sys.stderr.write(mess % pidfile) if 'stop' == action: sys.exit(1) action = 'start' pid = None else: try: while 1: os.kill(pid,SIGTERM) time.sleep(1) except OSError, err: err = str(err) if err.find("No such process") > 0: os.remove(pidfile) sys.stderr.write("Killed process %s.\n" % pid) if 'stop' == action: sys.exit(0) action = 'start' pid = None else: print str(err) sys.exit(1) if 'start' == action: if pid: mess = "Start aborded since pid file '%s' exists.\n" sys.stderr.write(mess % pidfile) sys.exit(1) deamonize(stdout,stderr,stdin,pidfile,startmsg) returndef deamonize(stdout='/dev/null', stderr=None, stdin='/dev/null', pidfile=None, startmsg = 'started with pid %s'): ''' This forks the current process into a daemon. The stdin, stdout, and stderr arguments are file names that will be opened and be used to replace the standard file descriptors in sys.stdin, sys.stdout, and sys.stderr. These arguments are optional and default to /dev/null. Note that stderr is opened unbuffered, so if it shares a file with stdout then interleaved output may not appear in the order that you expect. ''' # Do first fork. try: pid = os.fork() if pid > 0: sys.exit(0) # Exit first parent. except OSError, e: sys.stderr.write("fork #1 failed: (%d) %s\n" % (e.errno, e.strerror)) sys.exit(1) # Decouple from parent environment. #os.chdir("/") os.umask(0) os.setsid() # Do second fork. try: pid = os.fork() if pid > 0: sys.exit(0) # Exit second parent. except OSError, e: sys.stderr.write("fork #2 failed: (%d) %s\n" % (e.errno, e.strerror)) sys.exit(1) # Open file descriptors and print start message if not stderr: stderr = stdout si = file(stdin, 'r') so = file(stdout, 'a+') se = file(stderr, 'a+', 0) pid = str(os.getpid()) sys.stderr.write("%s\n" % startmsg % pid) sys.stderr.flush() if pidfile: file(pidfile,'w+').write("%s\n" % pid) # Redirect standard file descriptors. os.dup2(si.fileno(), sys.stdin.fileno()) os.dup2(so.fileno(), sys.stdout.fileno()) os.dup2(se.fileno(), sys.stderr.fileno())