bin/server.py

   1 #!/usr/bin/env python
   2
   3 import os, sys, string
   4 process_id = {}
   5
   6 # -----------------------------------------------------------------------------
   7 #
   8 # Definition des classes d'objets pour le lancement des Server CORBA
   9 #
  10
  11 class Server:
  12     """Generic class for CORBA server launch"""
  13
  14     def initArgs(self):
  15         self.PID=None
  16         self.CMD=[]
  17         self.ARGS=[]
  18         if self.args.get('xterm'):
  19             self.ARGS=['xterm', '-iconic', '-sb', '-sl', '500', '-hold']
  20
  21     def __init__(self,args):
  22         self.args=args
  23         self.initArgs()
  24
  25
  26     def run(self):
  27         global process_id
  28         myargs=self.ARGS
  29         if self.args.get('xterm'):
  30             # (Debian) send LD_LIBRARY_PATH to children shells (xterm)
  31             env_ld_library_path=['env', 'LD_LIBRARY_PATH='
  32                                  + os.getenv("LD_LIBRARY_PATH")]
  33             myargs = myargs +['-T']+self.CMD[:1]+['-e'] + env_ld_library_path
  34         command = myargs + self.CMD
  35         #print "command = ", command
  36         if sys.platform == "win32":
  37           import win32pm
  38           #cmd_str = "\"" + string.join(command, " ") + "\""
  39           #print cmd_str
  40           #pid = win32pm.spawnpid( cmd_str )
  41           pid = win32pm.spawnpid( string.join(command, " "), '-nc' )
  42           #pid = win32pm.spawnpid( string.join(command, " ") )
  43         else:
  44           #pid = os.spawnvp(os.P_NOWAIT, command[0], command)
  45           pid=self.daemonize(command)
  46         process_id[pid]=self.CMD
  47         self.PID = pid
  48         return pid
  49
  50     def daemonize(self,args):
  51         # to daemonize a process need to do the UNIX double-fork magic
  52         # see Stevens, "Advanced Programming in the UNIX Environment" for details (ISBN 0201563177)
  53         # and UNIX Programming FAQ 1.7 How do I get my program to act like a daemon?
  54         #     http://www.erlenstar.demon.co.uk/unix/faq_2.html#SEC16
  55         #open a pipe
  56         c2pread, c2pwrite = os.pipe()
  57         #do first fork
  58         pid=os.fork()
  59         if pid > 0:
  60           #first parent
  61           os.close(c2pwrite)
  62           #receive real pid from child
  63           data=os.read(c2pread,24) #read 24 bytes
  64           os.waitpid(pid,0) #remove zombie
  65           os.close(c2pread)
  66           # return : first parent
  67           return int(data)
  68
  69         #first child
  70         # decouple from parent environment
  71         os.setsid()
  72         os.close(c2pread)
  73
  74         # do second fork : second child not a session leader
  75         try:
  76           pid = os.fork()
  77           if pid > 0:
  78             #send real pid to parent
  79             os.write(c2pwrite,"%d" % pid)
  80             os.close(c2pwrite)
  81             # exit from second parent
  82             os._exit(0)
  83         except OSError, e:
  84           print >>sys.stderr, "fork #2 failed: %d (%s)" % (e.errno, e.strerror)
  85           os.write(c2pwrite,"-1")
  86           os.close(c2pwrite)
  87           sys.exit(1)
  88
  89         #I am a daemon
  90         os.close(0) #close stdin
  91         os.open("/dev/null", os.O_RDWR)  # redirect standard input (0) to /dev/null
  92         try:
  93           os.execvp(args[0], args)
  94         except OSError, e:
  95           print >>sys.stderr, "(%s) launch failed: %d (%s)" % (args[0],e.errno, e.strerror)
  96           os._exit(127)