[ROOT] EINTR handled in TSocket ?

From: Mathes, Hermann-Josef (Hermann-Josef.Mathes@ik.fzk.de)
Date: Tue Jul 13 2004 - 09:48:50 MEST 

 
Dear Rooters,
 
I am in doubt that EINTR is handled properly in the TSocket class. There was a message from Fons a long time ago concerning this subject (http://root.cern.ch/cgi-bin/print_hit_bold.pl/root/roottalk/roottalk01/2317.html), but I could not find it in the code (TUnixSystem::UnixSend(), TUnixSystem::SendRaw(), TSocket::Send() and TSocket::SendRaw()).
 
I have checked it in the sources of 3.00, 3.02, 3.05/07 (the version our project uses) and the CVS HEAD version.
 
This is my code fragment and I am using the alarm() function to send periodically signals to my application:
      cout << "Sending event # " << header->GetEventNo() << endl;
 
      mess.Reset();
      mess.SetWhat( kMESS_OBJECT );
 
      mess.WriteObject( event );
 
      length = socket->Send( mess );
 
      if ( length <= 0 ) {
        cerr << "TSocket::Send() - length= " << length << endl;
        cerr << "TSystem::GetErrno()= " << gSystem->GetErrno() << endl;
      }
 
This is the printout when the SIGALARM happens during/near the socket transaction:
 
Sending event # 11941
SigAlarmHandler() was called at 1089647658 !
SigAlarmHandler() was called at 1089647659 !
TSocket::Send() - length= -1
TSystem::GetErrno()= 4
 
I am overwriting the ROOT signal handler for SIGALARM through sigaction().
 
Could you please comment on it or help me to open my eyes ... ? If it is not handled what is your suggestion ?
 
Thanks for any help, suggestions etc.
Regards
Hermann-Josef
 
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