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Diff for /loncom/lonmaxima between versions 1.23 and 1.44

version 1.23, 2007/02/03 04:09:30 version 1.44, 2018/12/05 23:02:38
Line 44  use strict; Line 44  use strict;
 # global variables  # global variables
 my $PREFORK                = 5;        # number of children to maintain  my $PREFORK                = 5;        # number of children to maintain
 my $MAX_CLIENTS_PER_CHILD  = 50;       # number of clients each child should process  my $MAX_CLIENTS_PER_CHILD  = 50;       # number of clients each child should process
   my $extra_children         = 0;
 my %children               = ();       # keys are current child process IDs  my %children               = ();       # keys are current child process IDs
 my $children               = 0;        # current number of children  my $children               = 0;        # current number of children
 my $status;                            # string for current status  my $status;                            # string for current status
Line 60  sub REAPER {                        # ta Line 61  sub REAPER {                        # ta
                                     # and MAXIMA processes                                      # and MAXIMA processes
     $SIG{CHLD} = \&REAPER;      $SIG{CHLD} = \&REAPER;
     my $pid = wait;      my $pid = wait;
     $children--;      if (exists($children{$pid})) {
     delete($children{$pid});   $children--;
    delete($children{$pid});
    if ($extra_children) {
       $extra_children--;
    }
       }    
 }  }
     
 sub HUNTSMAN {                      # signal handler for SIGINT  sub HUNTSMAN {                      # signal handler for SIGINT
Line 126  sub catchexception { Line 132  sub catchexception {
 }  }
   
   
   sub child_announce_death {
       $SIG{USR1} = \&child_announce_death;
       if ($extra_children < $PREFORK*10) {
    $extra_children++;
       }
   }
   
 # ---------------------------------------------------------------- Main program  # ---------------------------------------------------------------- Main program
 # -------------------------------- Set signal handlers to record abnormal exits  # -------------------------------- Set signal handlers to record abnormal exits
Line 133  sub catchexception { Line 145  sub catchexception {
     
 $SIG{'QUIT'}=\&catchexception;  $SIG{'QUIT'}=\&catchexception;
 $SIG{__DIE__}=\&catchexception;  $SIG{__DIE__}=\&catchexception;
   $SIG{USR1} = \&child_announce_death;
     
 # ---------------------------------- Read loncapa_apache.conf and loncapa.conf  # ---------------------------------- Read loncapa_apache.conf and loncapa.conf
 &status("Read loncapa.conf and loncapa_apache.conf");  &status("Read loncapa.conf and loncapa_apache.conf");
Line 143  my $wwwid=getpwnam('www'); Line 156  my $wwwid=getpwnam('www');
 if ($wwwid!=$<) {  if ($wwwid!=$<) {
     my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";      my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
     my $subj="LON: User ID mismatch";      my $subj="LON: User ID mismatch";
     system("echo 'User ID mismatch.  lonmaxima must be run as user www.' |\      system("echo 'User ID mismatch.  lonmaxima must be run as user www.' |".
  mailto $emailto -s '$subj' > /dev/null");             " mail -s '$subj' $emailto > /dev/null");
     exit 1;      exit 1;
 }  }
     
Line 212  for (1 .. $PREFORK) { Line 225  for (1 .. $PREFORK) {
 while (1) {  while (1) {
     &status('Parent process, sleeping');      &status('Parent process, sleeping');
     sleep;                          # wait for a signal (i.e., child's death)      sleep;                          # wait for a signal (i.e., child's death)
     for (my $i = $children; $i < $PREFORK; $i++) {      for (my $i = $children; $i < $PREFORK+$extra_children; $i++) {
         &status('Parent process, starting child');          &status('Parent process, starting child');
         &make_new_child($server);           # top up the child pool          &make_new_child($server);           # top up the child pool
     }      }
Line 237  sub make_new_child { Line 250  sub make_new_child {
         return;          return;
     } else {      } else {
         # Child can *not* return from this subroutine.          # Child can *not* return from this subroutine.
         $SIG{INT} = 'DEFAULT';      # make SIGINT kill us as it did before          
    my $ppid = getppid();
             
         # unblock signals          # unblock signals
         sigprocmask(SIG_UNBLOCK, $sigset)          sigprocmask(SIG_UNBLOCK, $sigset)
Line 245  sub make_new_child { Line 259  sub make_new_child {
   
         &logthis('New process started');          &logthis('New process started');
   
         my $command=Expect->spawn('maxima');          my $command = new Expect();
         $command->log_stdout(0);          $command->log_stdout(0);
           #$command->log_file("$execdir/logs/lonmaxima.session.log");
           $command->spawn('maxima');
           &getmaximaoutput($command, 2); # wait for maxima to finish initialization
    # soft/hard_close can take awhile and we really
           # don't care we just want it gone
    $SIG{INT} = sub {
       my $pid = $command->pid();
       kill('KILL'=>$pid);
       exit; 
    };
   
         &getmaximaoutput($command);  
   
         for (my $i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {          for (my $i=0; $i < $MAX_CLIENTS_PER_CHILD; $i++) {
            &status('Accepting connections');              &status('Accepting connections');
            my $client = $server->accept()     or last;              my $client = $server->accept()     or last;
            print $command "kill(all);\n";              &sync($command);
    &getmaximaoutput($command);              print $command ("display2d:false;simp:true;kill(all);\n");
            &sync($command);      &getmaximaoutput($command,2);
            while (my $cmd=<$client>) {              &sync($command);
               &status('Processing command');              my $syntaxerr = 0;
               print $command &unescape($cmd);              while (my $cmd=<$client>) {
               my ($reply,$finished,$syntaxerr) = &getmaximaoutput($command);                  &status('Processing command');
               if ((!$finished) && (!$syntaxerr) && ($reply !~ /^Error\:/)) {                  print $command &unescape($cmd);
                   ($reply,$finished,$syntaxerr) = &getmaximaoutput($command);                  my ($reply,$syntaxerr) = &getmaximaoutput($command,1);
               }                  print $client &escape($reply)."\n";
               print $client &escape($reply)."\n";                  if ($syntaxerr) {
               if ($reply=~/^Error\:/) {                      last;
                  &logthis('Died through '.$reply);                  } elsif ($reply=~/^Error\:/) {
                  $client->close();                      &logthis('Died through '.$reply);
                  $command->hard_close();           kill('USR1' => $ppid);
                  exit;                      $client->close();
               }                            $command->hard_close();     
       &sync($command);                      exit;
               &status('Waiting for commands');                  }
            }          &sync($command);
                   &status('Waiting for commands');
               }
         }          }
   
    kill('USR1' => $ppid);
    print $command ("quit();\n");
         # tidy up gracefully and finish          # tidy up gracefully and finish
    sleep(15);
         $command->soft_close();          $command->soft_close();
   
         # this exit is VERY important, otherwise the child will become          # this exit is VERY important, otherwise the child will become
Line 294  sub make_new_child { Line 321  sub make_new_child {
  my $expect=$counter.time;   my $expect=$counter.time;
  print $command "$expect;\n";   print $command "$expect;\n";
  while (1) {   while (1) {
     my $output=&getmaximaoutput($command);      my $output=&getmaximaoutput($command,1);
     if (($output=~/\Q$expect\E/) || ($output=~/^Error\:/)) {      if (($output=~/\Q$expect\E/) || ($output=~/^Error\:/)) {
  return;   return;
     }      }
Line 303  sub make_new_child { Line 330  sub make_new_child {
 }  }
   
 sub getmaximaoutput {  sub getmaximaoutput {
     my ($command)=@_;      my ($command,$numcheck)=@_;
     my (undef,$error,undef,$output)=$command->expect(20, -re => '\(\%i\d+\)');      my $regexp = '\(\%i\d+\)';
       my $syntaxerr=0;
       if ($numcheck) {
           if ($numcheck eq 2) {
       # command was the killall so should get a full reset on
       # command numbers
       $regexp = '(\(\%i(1)\)|[Ii]ncorrect syntax\:)';
    } elsif ($command->match() =~ /\(\%i(\d+)\)/) {
               my $nextmatch = $1+1;
               $regexp = '(\(\%i'.$nextmatch.'\)|[Ii]ncorrect syntax\:)';
           }
       }
       my $timeout = 20;
       my (undef,$error,$matched,$output) =
    $command->expect($timeout, -re => $regexp);
   
       if ($numcheck && lc($matched) eq 'incorrect syntax:') {
    $syntaxerr = 1;
    if (wantarray) {
       return ($matched,$syntaxerr);
    } else {
       return $matched;
    }
       }
     if ($error) {      if ($error) {
        return 'Error: '.$error;   return 'Error: '.$error;
     }      }
     $output =~ s/\r+//g; # Remove Windows-style linebreaks      $output =~ s/\r+//gs; # Remove Windows-style linebreaks
     my $hasoutput=0;  
     my $foundoutput=0;      my $foundoutput=0;
     my $syntaxerr=0;      my $found_label=0;
     my $realoutput='';      my $realoutput='';
     foreach my $line (split(/\n/,$output)) {      foreach my $line (split(/\n/,$output)) {
        if ($line=~/\;/) { $foundoutput=1; next; }         if ($line=~/\;/) { $foundoutput=1; next; }
        if (!$foundoutput) { next; }         if (!$foundoutput) { next; }
        if ($line=~/^Incorrect syntax:/) { $syntaxerr = 1; next; }         if ($line=~/^[Ii]ncorrect syntax:/) { $syntaxerr = 1; next; }
        (my $label, $line) = ($line=~ /^(\(\%o\d+\))(.+)$/);         if ($line=~ /^(\(\%o\d+\))(.+)$/){
        if ($label) {             my $label = $1;
           $label=~s/\S/ /g;             $line = $2;
           $line=$label.$line;             $label =~s/\S/ /g;
           $hasoutput = 1;             $line=$label.$line;
      $found_label=1;
          }
          if ($found_label) {
      $realoutput.=$line."\n";
        }         }
        $realoutput.=$line."\n";  
     }      }
     if (wantarray) {      if (wantarray) {
         return ($realoutput,$hasoutput,$syntaxerr);          return ($realoutput,$syntaxerr);
     } else {      } else {
         return $realoutput;          return $realoutput;
     }      }
Removed from v.1.23  
changed lines
  Added in v.1.44

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