Index: openacs-4/packages/acs-subsite/www/shared/1pixel.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-subsite/www/shared/1pixel.tcl,v
diff -u -N -r1.2 -r1.2.2.1
--- openacs-4/packages/acs-subsite/www/shared/1pixel.tcl	13 Mar 2002 22:50:53 -0000	1.2
+++ openacs-4/packages/acs-subsite/www/shared/1pixel.tcl	6 May 2003 07:05:10 -0000	1.2.2.1
@@ -1,40 +1,55 @@
 # 1pixel.tcl,v 1.1.2.2 2000/02/03 10:00:24 ron Exp
-# File:        index.tcl
-# Date:        28 Nov 1999
-# Author:      Jon Salz <jsalz@mit.edu>
-# Description: Generates a 1-pixel GIF image with a certain color.
-# Inputs:      r g b
 
+ad_page_contract {
+    Generates a 1-pixel GIF image with a certain color.
+
+    @author Jon Salz <jsalz@mit.edu>
+    @creation-date 28 Nov 1999
+    @cvs-id $Id$
+} {
+    r:integer
+    g:integer
+    b:integer
+}
+
 ReturnHeaders "image/gif"
 
-set_the_usual_form_variables
+if { [catch {
+    set file [open "[acs_package_root_dir "acs-subsite"]/www/shared/1pixel.header"]
+    ns_writefp $file
+    close $file
 
-set file [open "[acs_package_root_dir "acs-subsite"]/www/shared/1pixel.header"]
-ns_writefp $file
-close $file
+    if { [util_aolserver_2_p] } {
+        if { $r == 0 } { set r 1 }
+        if { $g == 0 } { set g 1 }
+        if { $b == 0 } { set b 1 }
 
-if { [util_aolserver_2_p] } {
-    if { $r == 0 } { set r 1 }
-    if { $g == 0 } { set g 1 }
-    if { $b == 0 } { set b 1 }
+        ns_write "[format "%c%c%c" $r $g $b]"
+    } else {
+        # Can't figure out how to write binary data using AOLserver 3 (it
+        # insist on UTF8-encoding it). So we write to a file, then dump
+        # the file's contents.
 
-    ns_write "[format "%c%c%c" $r $g $b]"
-} else {
-    # Can't figure out how to write binary data using AOLserver 3 (it
-    # insist on UTF8-encoding it). So we write to a file, then dump
-    # the file's contents.
+        set file_name [ns_tmpnam]
+        ns_log "Notice" "logging to $file_name"
+        set file [open $file_name w+]
+        fconfigure $file -encoding binary
+        puts -nonewline $file "[format "%c%c%c" $r $g $b]"
+        seek $file 0
+        ns_writefp $file
+        close $file
+        ns_unlink $file_name
+    }
 
-    set file_name [ns_tmpnam]
-    ns_log "Notice" "logging to $file_name"
-    set file [open $file_name w+]
-    fconfigure $file -encoding binary
-    puts -nonewline $file "[format "%c%c%c" $r $g $b]"
-    seek $file 0
+    set file [open "[acs_package_root_dir "acs-subsite"]/www/shared/1pixel.footer"]
     ns_writefp $file
     close $file
-    ns_unlink $file_name
-}
 
-set file [open "[acs_package_root_dir "acs-subsite"]/www/shared/1pixel.footer"]
-ns_writefp $file
-close $file
+} errMsg] } {
+    # Ignore simple i/o errors, which probably just mean that the user surfed on 
+    # to some other page before we finished serving 
+    if { ![string equal $errMsg {i/o failed}] } {
+        global errorInfo
+        ns_log Error "$errMsg\n$errorInfo"
+    }
+}