--- loncom/Attic/lonc	2000/02/10 23:20:13	1.6
+++ loncom/Attic/lonc	2001/03/15 20:25:20	1.15
@@ -12,7 +12,12 @@
 
 # 6/4/99,6/5,6/7,6/8,6/9,6/10,6/11,6/12,7/14,7/19,
 # 10/8,10/9,10/15,11/18,12/22,
-# 2/8 Gerd Kortemeyer 
+# 2/8,7/25 Gerd Kortemeyer
+# 12/05 Scott Harrison
+# 12/05 Gerd Kortemeyer
+# 01/10/01 Scott Harrison
+# 03/14/01,03/15 Gerd Kortemeyer
+# 
 # based on nonforker from Perl Cookbook
 # - server who multiplexes without forking
 
@@ -25,8 +30,24 @@ use Fcntl;
 use Tie::RefHash;
 use Crypt::IDEA;
 
+# grabs exception and records it to log before exiting
+sub catchexception {
+    my ($signal)=@_;
+    $SIG{'QUIT'}='DEFAULT';
+    $SIG{__DIE__}='DEFAULT';
+    &logthis("<font color=red>CRITICAL: "
+     ."ABNORMAL EXIT. Child $$ for server $wasserver died through "
+     ."\"$signal\" with this parameter->[$@]</font>");
+    die($@);
+}
+
 $childmaxattempts=10;
 
+# -------------------------------- Set signal handlers to record abnormal exits
+
+$SIG{'QUIT'}=\&catchexception;
+$SIG{__DIE__}=\&catchexception;
+
 # ------------------------------------ Read httpd access.conf and get variables
 
 open (CONFIG,"/etc/httpd/conf/access.conf") || die "Can't read access.conf";
@@ -40,6 +61,27 @@ while ($configline=<CONFIG>) {
 }
 close(CONFIG);
 
+# ----------------------------- Make sure this process is running from user=www
+my $wwwid=getpwnam('www');
+if ($wwwid!=$<) {
+   $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
+   $subj="LON: $perlvar{'lonHostID'} User ID mismatch";
+   system("echo 'User ID mismatch.  lonc must be run as user www.' |\
+ mailto $emailto -s '$subj' > /dev/null");
+   exit 1;
+}
+
+# --------------------------------------------- Check if other instance running
+
+my $pidfile="$perlvar{'lonDaemons'}/logs/lonc.pid";
+
+if (-e $pidfile) {
+   my $lfh=IO::File->new("$pidfile");
+   my $pide=<$lfh>;
+   chomp($pide);
+   if (kill 0 => $pide) { die "already running"; }
+}
+
 # ------------------------------------------------------------- Read hosts file
 
 open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
@@ -85,6 +127,7 @@ sub HUPSMAN {                      # sig
     local($SIG{CHLD}) = 'IGNORE';  # we're going to kill our children
     kill 'INT' => keys %children;
     &logthis("<font color=red>CRITICAL: Restarting</font>");
+    unlink("$execdir/logs/lonc.pid");
     my $execdir=$perlvar{'lonDaemons'};
     exec("$execdir/lonc");         # here we go again
 }
@@ -261,7 +304,7 @@ $key=$key.$buildkey.$key.$buildkey.$key.
 $key=substr($key,0,32);
 my $cipherkey=pack("H32",$key);
 if ($cipher=new IDEA $cipherkey) {
-   &logthis("Secure connection inititalized: $conserver");
+   &logthis("Secure connection initialized: $conserver");
 } else {
    my $st=120+int(rand(240));
    &logthis(
@@ -400,16 +443,21 @@ while (1) {
         $rv = $client->send($outbuffer{$client}, 0);
         unless (defined $rv) {
             # Whine, but move on.
-            warn "I was told I could write, but I can't.\n";
+            &logthis("I was told I could write, but I can't.\n");
             next;
         }
+        $errno=$!;
         if (($rv == length $outbuffer{$client}) ||
-            ($! == POSIX::EWOULDBLOCK)) {
+            ($errno == POSIX::EWOULDBLOCK) || ($errno == 0)) {
             substr($outbuffer{$client}, 0, $rv) = '';
             delete $outbuffer{$client} unless length $outbuffer{$client};
         } else {
             # Couldn't write all the data, and it wasn't because
             # it would have blocked.  Shutdown and move on.
+
+	    &logthis("Dropping data with ".$errno.": ".
+                     length($outbuffer{$client}).", $rv");
+
             delete $inbuffer{$client};
             delete $outbuffer{$client};
             delete $ready{$client};
@@ -489,7 +537,3 @@ sub nonblock {
             or die "Can't make socket nonblocking: $!\n";
 }
 
-
-
-
-