Revert trunk to bleeding_edge at r12484

tools/testrunner/server/daemon.py

-#!/usr/bin/env python
-
-# This code has been written by Sander Marechal and published at:
-# http://www.jejik.com/articles/2007/02/a_simple_unix_linux_daemon_in_python/
-# where the author has placed it in the public domain (see comment #6 at
-# http://www.jejik.com/articles/2007/02/a_simple_unix_linux_daemon_in_python/#c6
-# ).
-# Some minor modifications have been made by the V8 authors. The work remains
-# in the public domain.
-
-import atexit
-import os
-from signal import SIGTERM
-from signal import SIGINT
-import sys
-import time
-
-
-class Daemon(object):
-  """
-  A generic daemon class.
-
-  Usage: subclass the Daemon class and override the run() method
-  """
-  def __init__(self, pidfile, stdin='/dev/null',
-               stdout='/dev/null', stderr='/dev/null'):
-    self.stdin = stdin
-    self.stdout = stdout
-    self.stderr = stderr
-    self.pidfile = pidfile
-
-  def daemonize(self):
-    """
-    do the UNIX double-fork magic, see Stevens' "Advanced
-    Programming in the UNIX Environment" for details (ISBN 0201563177)
-    http://www.erlenstar.demon.co.uk/unix/faq_2.html#SEC16
-    """
-    try:
-      pid = os.fork()
-      if pid > 0:
-        # exit first parent
-        sys.exit(0)
-    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.setsid()
-    os.umask(0)
-
-    # do second fork
-    try:
-      pid = os.fork()
-      if pid > 0:
-        # exit from second parent
-        sys.exit(0)
-    except OSError, e:
-      sys.stderr.write("fork #2 failed: %d (%s)\n" % (e.errno, e.strerror))
-      sys.exit(1)
-
-    # redirect standard file descriptors
-    sys.stdout.flush()
-    sys.stderr.flush()
-    si = file(self.stdin, 'r')
-    so = file(self.stdout, 'a+')
-    se = file(self.stderr, 'a+', 0)
-    # TODO: (debug) re-enable this!
-    #os.dup2(si.fileno(), sys.stdin.fileno())
-    #os.dup2(so.fileno(), sys.stdout.fileno())
-    #os.dup2(se.fileno(), sys.stderr.fileno())
-
-    # write pidfile
-    atexit.register(self.delpid)
-    pid = str(os.getpid())
-    file(self.pidfile, 'w+').write("%s\n" % pid)
-
-  def delpid(self):
-    os.remove(self.pidfile)
-
-  def start(self):
-    """
-    Start the daemon
-    """
-    # Check for a pidfile to see if the daemon already runs
-    try:
-      pf = file(self.pidfile, 'r')
-      pid = int(pf.read().strip())
-      pf.close()
-    except IOError:
-      pid = None
-
-    if pid:
-      message = "pidfile %s already exist. Daemon already running?\n"
-      sys.stderr.write(message % self.pidfile)
-      sys.exit(1)
-
-    # Start the daemon
-    self.daemonize()
-    self.run()
-
-  def stop(self):
-    """
-    Stop the daemon
-    """
-    # Get the pid from the pidfile
-    try:
-      pf = file(self.pidfile, 'r')
-      pid = int(pf.read().strip())
-      pf.close()
-    except IOError:
-      pid = None
-
-    if not pid:
-      message = "pidfile %s does not exist. Daemon not running?\n"
-      sys.stderr.write(message % self.pidfile)
-      return # not an error in a restart
-
-    # Try killing the daemon process
-    try:
-      # Give the process a one-second chance to exit gracefully.
-      os.kill(pid, SIGINT)
-      time.sleep(1)
-      while 1:
-        os.kill(pid, SIGTERM)
-        time.sleep(0.1)
-    except OSError, err:
-      err = str(err)
-      if err.find("No such process") > 0:
-        if os.path.exists(self.pidfile):
-          os.remove(self.pidfile)
-      else:
-        print str(err)
-        sys.exit(1)
-
-  def restart(self):
-    """
-    Restart the daemon
-    """
-    self.stop()
-    self.start()
-
-  def run(self):
-    """
-    You should override this method when you subclass Daemon. It will be
-    called after the process has been daemonized by start() or restart().
-    """