[boost] Re: build_monitor.exe: a cure worse than the disease

From: Rob Williscroft (rtw_at_[hidden])
Date: 2004-08-02 06:48:38

Victor A. Wagner Jr. wrote in
news:6.1.2.0.2.20040801130827.05d83938_at_[hidden] in
gmane.comp.lib.boost.devel: 

> I have NO idea what criteria build_monitor uses to killing processes,
> but when I awoke this morning, it had managed to kill:  the dnet "run
> in the background" ORG process, Pirch (my IRC client), a proxy that
> lets me get dcc's through my hardware firewall, Trillian (the instant
> message program), SpyBot resident.....
> I think you get the picture.
> this thing just walked through my system like a hoard of Vandals (or
> was it Visigoths).
> whatever
> 
> DO NO RUN THIS PROGRAM ON YOUR SYSTEM UNTIL IT'S FIXED
> 
> my results will be delayed as a result of my stopping the -monitored
> tests because I'll have to manually click through the modal dialogs
> (may their creator roast in hell) so the tests will finish.
> 

Their creator did at least write a manual :).

<http://msdn.microsoft.com/library/default.asp?url=/library/en-
us/debug/base/seterrormode.asp>
 
http://tinyurl.com/4sq3j

The real problem is we write command line programms for *nix and 
then expect them to work just the same in windows.

Driver programme:

  #include <cstdlib>
  #include <windows.h>
  
  int main()
  {
    UINT previous = SetErrorMode( SEM_NOGPFAULTERRORBOX );
    std::system( "segfault.exe" );
    SetErrorMode( previous );
  }
  
segfault.exe:

  #include <iostream>
  int main()
  {
    int p = 0;
    // int *p = 0;
    
    std::cout << "segfault\n";
    std::cout.flush();
        
    return 1 / p;
    // return *p;
  }
  
Assuming bjam doesn't call SetErrorMode( 0 ) itself, then as the 
error mode is "inherited" you shouldn't get any more popups.

I suggest rewriting the "Driver" programme above to invoke bjam or
whatever it is that invokes bjam. 

If a python version is more convenient:

import sys, os
    
_nowin32api = True
if sys.platform[ : 3 ] == 'win':
  SEM_NOGPFAULTERRORBOX = 0x0002
  
  try:
    import win32api
    _nowin32api = False
  
    class _error_mode( object ):
      def __init__( self ):
        self.mode = win32api.SetErrorMode( SEM_NOGPFAULTERRORBOX )
      def restore( self ):
        win32api.SetErrorMode( self.mode )
      pass

  except ImportError:
    print >> sys.stderr, "Warning win32 and no win32api (beware popups)"
    
  
if _nowin32api:
  class _error_mode( object ):
    def restore( self ):
      pass
    pass

def open_command( cmd, open = os.system ):
  """
  does:
    wrapper for os.system, avoid's popups on win32
  """
  try:
    emode = _error_mode()    
    result = open( cmd )
  finally:
    emode.restore()
          
  return result

if __name__ == '__main__':
  open_command( 'segfault.exe' )
  print 'Ok'

win32api is here:

http://starship.python.net/crew/mhammond/win32/Downloads.html

Rob.
-- 
http://www.victim-prime.dsl.pipex.com/