--- loncom/lond	2000/09/25 20:22:58	1.21
+++ loncom/lond	2000/12/05 19:14:59	1.26
@@ -8,6 +8,8 @@
 # 03/07,05/31 Gerd Kortemeyer
 # 06/26 Scott Harrison
 # 06/29,06/30,07/14,07/15,07/17,07/20,07/25,09/18 Gerd Kortemeyer
+# 12/05 Scott Harrison
+# 12/05 Gerd Kortemeyer
 #
 # based on "Perl Cookbook" ISBN 1-56592-243-3
 # preforker - server who forks first
@@ -25,9 +27,43 @@ use LWP::UserAgent();
 use GDBM_File;
 use Authen::Krb4;
 
+# 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 $$ for server $wasserver died through "
+     ."$signal with this parameter->[$@]</font>");
+    if ($client) { print $client "error: $@\n"; }
+    die($@);
+}
+
+# grabs exception and records it to log before exiting
+# NOTE: we must NOT use the regular (non-overrided) die function in
+# the code because a handler CANNOT be attached to it
+# (despite what some of the documentation says about SIG{__DIE__}.
+
+sub catchdie {
+    my ($message)=@_;
+    $SIG{'QUIT'}='DEFAULT';
+    $SIG{__DIE__}='DEFAULT';
+    &logthis("<font color=red>CRITICAL: "
+     ."ABNORMAL EXIT. Child $$ for server $wasserver died through "
+     ."\_\_DIE\_\_ with this parameter->[$message]</font>");
+    if ($client) { print $client "error: $message\n"; }
+    die($message);
+}
+
+# -------------------------------- 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";
+open (CONFIG,"/etc/httpd/conf/access.conf")
+    || catchdie "Can't read access.conf";
 
 while ($configline=<CONFIG>) {
     if ($configline =~ /PerlSetVar/) {
@@ -46,14 +82,15 @@ if (-e $pidfile) {
    my $lfh=IO::File->new("$pidfile");
    my $pide=<$lfh>;
    chomp($pide);
-   if (kill 0 => $pide) { die "already running"; }
+   if (kill 0 => $pide) { catchdie "already running"; }
 }
 
 $PREFORK=4; # number of children to maintain, at least four spare
 
 # ------------------------------------------------------------- Read hosts file
 
-open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab") || die "Can't read host file";
+open (CONFIG,"$perlvar{'lonTabDir'}/hosts.tab")
+    || catchdie "Can't read host file";
 
 while ($configline=<CONFIG>) {
     my ($id,$domain,$role,$name,$ip)=split(/:/,$configline);
@@ -70,7 +107,7 @@ $server = IO::Socket::INET->new(LocalPor
                                 Proto     => 'tcp',
                                 Reuse     => 1,
                                 Listen    => 10 )
-  or die "making socket: $@\n";
+  or catchdie "making socket: $@\n";
 
 # --------------------------------------------------------- Do global variables
 
@@ -253,9 +290,9 @@ sub ishome {
 
 $fpid=fork;
 exit if $fpid;
-die "Couldn't fork: $!" unless defined ($fpid);
+catchdie "Couldn't fork: $!" unless defined ($fpid);
 
-POSIX::setsid() or die "Can't start new session: $!";
+POSIX::setsid() or catchdie "Can't start new session: $!";
 
 # ------------------------------------------------------- Write our PID on disk
 
@@ -294,14 +331,14 @@ sub make_new_child {
     # block signal for fork
     $sigset = POSIX::SigSet->new(SIGINT);
     sigprocmask(SIG_BLOCK, $sigset)
-        or die "Can't block SIGINT for fork: $!\n";
+        or catchdie "Can't block SIGINT for fork: $!\n";
     
-    die "fork: $!" unless defined ($pid = fork);
+    catchdie "fork: $!" unless defined ($pid = fork);
     
     if ($pid) {
         # Parent records the child's birth and returns.
         sigprocmask(SIG_UNBLOCK, $sigset)
-            or die "Can't unblock SIGINT for fork: $!\n";
+            or catchdie "Can't unblock SIGINT for fork: $!\n";
         $children{$pid} = 1;
         $children++;
         return;
@@ -311,7 +348,7 @@ sub make_new_child {
     
         # unblock signals
         sigprocmask(SIG_UNBLOCK, $sigset)
-            or die "Can't unblock SIGINT for fork: $!\n";
+            or catchdie "Can't unblock SIGINT for fork: $!\n";
 
         $tmpsnum=0;
     
@@ -522,7 +559,7 @@ sub make_new_child {
                              $response=$ua->request($request,$transname);
 			      }
                              if ($response->is_error()) {
-				 unline($transname);
+				 unlink($transname);
                                  my $message=$response->status_line;
                                  &logthis(
                                   "LWP GET: $message for $fname ($remoteurl)");
@@ -569,8 +606,11 @@ sub make_new_child {
                          } else {
                            $now=time;
                            { 
-                            my $sh=IO::File->new(">$fname.$hostid{$clientip}");
-                            print $sh "$clientip:$now\n";
+			    my $sh;
+                            if ($sh=
+                             IO::File->new(">$fname.$hostid{$clientip}")) {
+                               print $sh "$clientip:$now\n";
+			    }
 			   }
                            $fname=~s/\/home\/httpd\/html\/res/raw/;
                            $fname="http://$thisserver/".$fname;