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Diff for /loncom/Attic/lonc between versions 1.32 and 1.33

version 1.32, 2002/03/08 03:56:19 version 1.33, 2002/03/20 03:42:45
Line 45 Line 45
 # 12/20 Scott Harrison  # 12/20 Scott Harrison
 # YEAR=2002  # YEAR=2002
 # 2/19/02,02/22/02,02/25/02 Gerd Kortemeyer  # 2/19/02,02/22/02,02/25/02 Gerd Kortemeyer
 #   # 3/07/02 Ron Fox 
 # based on nonforker from Perl Cookbook  # based on nonforker from Perl Cookbook
 # - server who multiplexes without forking  # - server who multiplexes without forking
   
Line 279  unlink($port); Line 279  unlink($port);
             }              }
             $cmd="enc:$cmdlength:$encrequest\n";              $cmd="enc:$cmdlength:$encrequest\n";
         }          }
     $SIG{ALRM}=sub { die "timeout" };   $answer = londtransaction($remotesock, $cmd, 60);
     $SIG{__DIE__}='DEFAULT';  
     eval {  
         alarm(60);  
         print $remotesock "$cmd\n";  
         $answer=<$remotesock>;  
  chomp($answer);   chomp($answer);
         alarm(0);  
     };  
     $SIG{ALRM}='DEFAULT';  
     $SIG{__DIE__}=\&catchexception;  
   
         if (($answer ne '') && ($@!~/timeout/)) {          if (($answer ne '') && ($@!~/timeout/)) {
     unlink("$dfname");      unlink("$dfname");
Line 309  unless ( Line 300  unless (
        my $st=120+int(rand(240));         my $st=120+int(rand(240));
        &logthis(         &logthis(
          "<font color=blue>WARNING: ".           "<font color=blue>WARNING: ".
          "Can't make server socket ($st secs): $@ .. exiting</font>");           "Can't make server socket ($st secs):  .. exiting</font>");
        sleep($st);         sleep($st);
        exit;          exit; 
      };       };
Line 441  sub handle { Line 432  sub handle {
         # $request is the text of the request          # $request is the text of the request
         # put text of reply into $outbuffer{$client}          # put text of reply into $outbuffer{$client}
 # ------------------------------------------------------------ Is this the end?  # ------------------------------------------------------------ Is this the end?
    chomp($request);
  if($DEBUG) {   if($DEBUG) {
      &logthis("<font color=green> Request $request processing starts</font>");       &logthis("<font color=green> Request $request processing starts</font>");
         }          }
Line 464  sub handle { Line 456  sub handle {
                 $encrequest.=                  $encrequest.=
                     unpack("H16",$cipher->encrypt(substr($cmd,$encidx,8)));                      unpack("H16",$cipher->encrypt(substr($cmd,$encidx,8)));
             }              }
             $request="enc:$cmdlength:$encrequest\n";              $request="enc:$cmdlength:$encrequest";
         }          }
 # --------------------------------------------------------------- Main exchange  # --------------------------------------------------------------- Main exchange
     $SIG{ALRM}=sub { die "timeout" };   $answer = londtransaction($remotesock, $request, 300);
     $SIG{__DIE__}='DEFAULT';  
     eval {   if($DEBUG) { 
         alarm(300);      &logthis("<font color=green> Request data exchange complete");
         &status("Sending: $request");   }
         print $remotesock "$request";   if ($@=~/timeout/) { 
         &status("Waiting for reply from $conserver: $request");      $answer='';
         $answer=<$remotesock>;      &logthis(
         &status("Received reply: $request");       "<font color=red>CRITICAL: Timeout: $request</font>");
         alarm(0);   }  
     };  
     if($DEBUG) {   
  &logthis("<font color=green> Request data exchange complete");  
     }  
     if ($@=~/timeout/) {   
        $answer='';  
        &logthis(  
         "<font color=red>CRITICAL: Timeout: $request</font>");  
     }    
     $SIG{ALRM}='DEFAULT';  
     $SIG{__DIE__}=\&catchexception;  
   
   
         if ($answer) {          if ($answer) {
Line 503  sub handle { Line 484  sub handle {
       $answer=substr($answer,0,$cmdlength);        $answer=substr($answer,0,$cmdlength);
       $answer.="\n";        $answer.="\n";
    }     }
      if($DEBUG) {
          &logthis("sending $answer to client\n");
      }
            $outbuffer{$client} .= $answer;             $outbuffer{$client} .= $answer;
         } else {          } else {
            $outbuffer{$client} .= "con_lost\n";             $outbuffer{$client} .= "con_lost\n";
Line 552  unless ( Line 536  unless (
    ) {      ) { 
   
        &logthis(         &logthis(
 "<font color=blue>WARNING: Couldn't connect to $conserver ($st secs): $@</font>");  "<font color=blue>WARNING: Couldn't connect to $conserver ($st secs): </font>");
        sleep($st);         sleep($st);
        exit;          exit; 
      };       };
Line 561  unless ( Line 545  unless (
 &logthis("<font color=green>INFO Connected to $conserver, initing </font>");  &logthis("<font color=green>INFO Connected to $conserver, initing </font>");
 &status("Init dialogue: $conserver");  &status("Init dialogue: $conserver");
   
      $SIG{ALRM}=sub { die "timeout" };      $answer = londtransaction($remotesock, "init", 60);
      $SIG{__DIE__}='DEFAULT';      chomp($answer);
      eval {      $answer = londtransaction($remotesock, $answer, 60);
          alarm(60);      chomp($answer);
 print $remotesock "init\n";  
 $answer=<$remotesock>;  
 print $remotesock "$answer";  
 $answer=<$remotesock>;  
 chomp($answer);  
           alarm(0);  
      };  
      $SIG{ALRM}='DEFAULT';  
      $SIG{__DIE__}=\&catchexception;  
     
      if ($@=~/timeout/) {       if ($@=~/timeout/) {
  &logthis("Timed out during init.. exiting");   &logthis("Timed out during init.. exiting");
Line 632  sub catchexception { Line 607  sub catchexception {
     chomp($signal);      chomp($signal);
     &logthis("<font color=red>CRITICAL: "      &logthis("<font color=red>CRITICAL: "
      ."ABNORMAL EXIT. Child $$ for server [$wasserver] died through "       ."ABNORMAL EXIT. Child $$ for server [$wasserver] died through "
      ."\"$signal\" with parameter [$@]</font>");       ."\"$signal\" with parameter </font>");
     die($@);      die("Signal abend");
 }  }
   
 # -------------------------------------- Routines to see if other box available  # -------------------------------------- Routines to see if other box available
Line 736  sub subreply { Line 711  sub subreply {
        or return "con_lost";         or return "con_lost";
   
   
     $SIG{ALRM}=sub { die "timeout" };      $answer = londtransaction($sclient, $cmd, 10);
     $SIG{__DIE__}='DEFAULT';  
     eval {  
      alarm(10);  
      print $sclient "$cmd\n";  
      $answer=<$sclient>;  
      chomp($answer);  
      alarm(0);  
     };  
     if ((!$answer) || ($@=~/timeout/)) { $answer="con_lost"; }      if ((!$answer) || ($@=~/timeout/)) { $answer="con_lost"; }
     $SIG{ALRM}='DEFAULT';      $SIG{ALRM}='DEFAULT';
     $SIG{__DIE__}=\&catchexception;      $SIG{__DIE__}=\&catchexception;
Line 764  sub logthis { Line 732  sub logthis {
     print $fh "$local ($$) [$conserver] [$status]: $message\n";      print $fh "$local ($$) [$conserver] [$status]: $message\n";
 }  }
   
   #--------------------------------------  londtransaction:
   #  
   #  Performs a transaction with lond with timeout support.
   #    result = londtransaction(socket,request,timeout)
   #
   sub londtransaction {
       my ($socket, $request, $tmo) = @_;
   
       if($DEBUG) {
    &logthis("londtransaction request: $request");
       }
   
       # Set the signal handlers: ALRM for timeout and disble the others.
   
       $SIG{ALRM} = sub { die "timeout" };
       $SIG{__DIE__} = 'DEFAULT';
       
       # Disable all but alarm so that only that can interupt the
       # send /receive.
       #
       my $sigset = POSIX::SigSet->new(QUIT, USR1, HUP, INT, TERM);
       my $priorsigs = POSIX::SigSet->new;
       unless (defined sigprocmask(SIG_BLOCK, $sigset, $priorsigs)) {
    &logthis("<font color=red> CRITICAL -- londtransaction ".
    "failed to block signals </font>");
    die "could not block signals in londtransaction";
       }
       $answer = '';
       #
       #  Send request to lond.
       #
       eval { 
    alarm($tmo);
    print $socket "$request\n";
    alarm(0);
       };
       #  If request didn't timeout, try for the response.
       #
   
       if ($@!~/timeout/) {
    eval {
       alarm($tmo);
       $answer = <$socket>;
       if($DEBUG) {
    &logthis("Received $answer in londtransaction");
       }
       alarm(0);
    };
       } else {
    if($DEBUG) {
       &logthis("Timeout on send in londtransaction");
    }
       }
       if( ($@ =~ /timeout/)  && ($DEBUG)) {
    &logthis("Timeout on receive in londtransaction");
       }
       #
       # Restore the initial sigmask set.
       #
       unless (defined sigprocmask(SIG_UNBLOCK, $priorsigs)) {
    &logthis("<font color=red> CRITICAL -- londtransaction ".
    "failed to re-enable signal processing. </font>");
    die "londtransaction failed to re-enable signals";
       }
       #
       # go back to the prior handler set.
       #
       $SIG{ALRM} = 'DEFAULT';
       $SIG{__DIE__} = \&cathcexception;
   
       #    chomp $answer;
       if ($DEBUG) {
    &logthis("Returning $answer in londtransaction");
       }
       return $answer;
   
   }
   
 sub logperm {  sub logperm {
     my $message=shift;      my $message=shift;
Line 824  B<lonc> forks off children processes tha Line 869  B<lonc> forks off children processes tha
 in the network.  Management of these processes can be done at the  in the network.  Management of these processes can be done at the
 parent process level or the child process level.  parent process level or the child process level.
   
     After forking off the children, B<lonc> the B<parent> 
   executes a main loop which simply waits for processes to exit.
   As a process exits, a new process managing a link to the same
   peer as the exiting process is created.  
   
 B<logs/lonc.log> is the location of log messages.  B<logs/lonc.log> is the location of log messages.
   
 The process management is now explained in terms of linux shell commands,  The process management is now explained in terms of linux shell commands,
Line 899  Subroutine B<USRMAN>: Line 949  Subroutine B<USRMAN>:
 SIGUSR1 is sent to all the children, and the status of  SIGUSR1 is sent to all the children, and the status of
 each connection is logged.  each connection is logged.
   
 =item *  
   
 SIGCHLD  
   
   
 Child signal assignment:  
  none  
   
 Command-line invocations:  
  B<kill> B<-s> SIGCHLD I<PID>  
   
 Subroutine B<REAPER>:  
  This is only invoked for the B<lonc> parent I<PID>.  
 Information pertaining to the child is removed.  
 The socket port is cleaned up.  
   
 =back  =back
   
Removed from v.1.32  
changed lines
  Added in v.1.33

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