Diff of /trunk/webwork2/lib/WeBWorK/ContentGenerator/Problem.pm

Revision 388		Revision 392
…		…
4	use lib '/Users/gage/webwork-modperl/lib';	4	use lib '/Users/gage/webwork-modperl/lib';
5	use PGtranslator5;	5	use PGtranslator5;
6	use WeBWorK::ContentGenerator;	6	use WeBWorK::ContentGenerator;
7	use Apache::Constants qw(:common);	7	use Apache::Constants qw(:common);
8		8
		9	###############################################################################
		10	# Configuration
		11	###############################################################################
		12
		13	my $COURSE_SCRIPTS_DIRECTORY = '/Users/gage/webwork/system/courseScripts/';
		14	my $MACRO_DIRECTORY = '/Users/gage/webwork/courseData/templates/macro/';
		15	my $TEMPLATE_DIRECTORY = '/Users/gage/webwork/rochester_problib/';
		16	my $TEMP_URL = 'http://127.0.0.1/~gage/rochester_problibtmp/';
		17	##my $HTML_DIRECTORY = '/Users/gage/Sites/rochester_problib/' #already obtained from courseEnvironment
		18	my $HTML_URL = 'http://127.0.0.1/~gage/rochester_problib/';
		19
		20	###############################################################################
		21	# End configuration
		22	###############################################################################
		23
9	sub title {	24	sub title {
10	my ($self, $problem_set, $problem) = @_;	25	my ($self, $problem_set, $problem) = @_;
11	my $r = $self->{r};	26	my $r = $self->{r};
12	my $user = $r->param('user');	27	my $user = $r->param('user');
13	return "Problem $problem of problem set $problem_set for $user";	28	return "Problem $problem of problem set $problem_set for $user";
14	}	29	}
15		30
		31	###############################################################################
		32	#
		33	# INITIALIZATION
		34	#
		35	# The following code initializes an instantiation of PGtranslator5 in the
		36	# parent process. This initialized object is then share with each of the
		37	# children forked from this parent process by the daemon.
		38	#
		39	# As far as I can tell, the child processes don't share any variable values even
		40	# though their namespaces are the same.
		41	###############################################################################
		42	# First some dummy values to use for testing.
		43	# These should be available from the problemEnvironment(it might be ok to assume that PG and dangerousMacros
		44	# live in the courseScripts (system level macros) directory.
		45
		46	print STDERR "Begin intitalization\n";
		47	my $dummy_envir = { courseScriptsDirectory => $COURSE_SCRIPTS_DIRECTORY,
		48	displayMode => 'HTML_tth',
		49	macroDirectory => $MACRO_DIRECTORY,
		50	cgiURL => 'foo_cgiURL'};
		51
		52
		53	my $PG_PL = "${COURSE_SCRIPTS_DIRECTORY}PG.pl";
		54	my $DANGEROUS_MACROS_PL = "${COURSE_SCRIPTS_DIRECTORY}dangerousMacros.pl";
		55	my @MODULE_LIST = ( "Exporter", "DynaLoader", "GD", "WWPlot", "Fun",
		56	"Circle", "Label", "PGrandom", "Units", "Hermite",
		57	"List", "Match","Multiple", "Select", "AlgParser",
		58	"AnswerHash", "Fraction", "VectorField", "Complex1",
		59	"Complex", "MatrixReal1", "Matrix","Distributions",
		60	"Regression"
		61	);
		62	my @EXTRA_PACKAGES = ( "AlgParserWithImplicitExpand", "Expr",
		63	"ExprWithImplicitExpand", "AnswerEvaluator",
		64
		65	);
		66	$INITIAL_MACRO_PACKAGES = <<END_OF_TEXT;
		67	DOCUMENT();
		68	loadMacros(
		69	"PGbasicmacros.pl",
		70	"PGchoicemacros.pl",
		71	"PGanswermacros.pl",
		72	"PGnumericalmacros.pl",
		73	"PGgraphmacros.pl",
		74	"PGauxiliaryFunctions.pl",
		75	"PGmatrixmacros.pl",
		76	"PGcomplexmacros.pl",
		77	"PGstatisticsmacros.pl"
		78
		79	);
		80
		81	TEXT("Hello world");
		82
		83	ENDDOCUMENT();
		84
		85	END_OF_TEXT
		86
		87	#These here documents have their drawbacks. KEEP END_OF_TEXT left justified!!!!!!
		88
		89	###############################################################################
		90	# Now to define the body subroutine which does the hard work.
		91	###############################################################################
		92
		93
		94	#my $SOURCE1 = $INITIAL_MACRO_PACKAGES;
		95
16	sub body {	96	sub body {
17	my ($self, $problem_set, $problem) = @_;	97	my ($self, $problem_set, $problem) = @_;
18	my $r = $self->{r};	98	my $r = $self->{r};
19	my $courseEnvironment = $self->{courseEnvironment};	99	my $courseEnvironment = $self->{courseEnvironment};
20	my $user = $r->param('user');	100	my $user = $r->param('user');
21		101
		102
		103	my $SOURCE1 = readFile('set0/prob1c.pg');
		104	print STDERR "SOURCEFILE: \n$SOURCE1\n\n";
		105
		106	###########################################################################
		107	# The pg problem class should have a method for installing it's problemEnvironment
		108	###########################################################################
		109
		110	$problemEnvir_rh = defineProblemEnvir($self);
		111
		112
		113	##################################################################################
		114	# Prime the PGtranslator object and set it loose
		115	##################################################################################
		116
		117
		118	###############################################################################
		119
		120	###############################################################################
		121	#Create the PG translator.
		122	###############################################################################
		123
		124	my $pt = new PGtranslator5; #pt stands for problem translator;
		125
		126
		127	# All of these hard coded directories need to be drawn from courseEnvironment.
		128	# In addition I don't think that PGtranslator uses this stack internally yet.
		129	# Passing these directories through the problemEnvironment variable is what
		130	# is currently being done, but I don't think it is quite right, at least for most
		131	# of them.
		132
		133
		134	$pt ->rh_directories( { courseScriptsDirectory => $COURSE_SCRIPTS_DIRECTORY,
		135	macroDirectory => $MACRO_DIRECTORY,
		136	,
		137	templateDirectory => $TEMPLATE_DIRECTORY,
		138	tempDirectory => $TEMP_DIRECTORY,
		139	}
		140	);
		141
		142	###############################################################################
		143	# First we load the modules from courseScripts directory.
		144	# These do the "heavy lifting" in terms of formatting, creating graphs, and
		145	# performing other heavy duty algorithms.
		146	#
		147	###############################################################################
		148
		149	$pt -> evaluate_modules( @MODULE_LIST);
		150	$pt -> load_extra_packages( @EXTRA_PACKAGES );
		151
		152	###############################################################################
		153	# Load the environment constants. Some are used by the PGtranslator object but
		154	# most of them are installed inside the Safe compartment where the problem
		155	# runs.
		156	###############################################################################
		157	#$pt -> environment($dummy_envir);
		158	$pt -> environment($problemEnvir_rh);
		159
		160
		161	# I've forgotten what this does exactly :-)
		162	$pt->initialize();
		163
		164	###############################################################################
		165	# PG.pl contains the basic code which defines the problem interface, input and output.
		166	# dangerousMacros.pl contains subroutines which have access to the hard drive and
		167	# and the directory structure. All use of external resources by the problem is supposed
		168	# to go through these subroutines. The idea is to put the potentially dangerous
		169	# algorithms in on place so they can be watched closely.
		170	# These two files are evaluated in the Safe compartment without any restrictions.
		171	# They have full use of the perl commands.
		172	###############################################################################
		173	my $loadErrors = $pt -> unrestricted_load($PG_PL );
		174	print STDERR "$loadErrors\n" if ($loadErrors);
		175	$loadErrors = $pt -> unrestricted_load($DANGEROUS_MACROS_PL);
		176	print STDERR "$loadErrors\n" if ($loadErrors);
		177
		178	###############################################################################
		179	# Now set the mask to restrict the operations which can be performed within
		180	# a problem or a macro file.
		181	###############################################################################
		182	$pt-> set_mask();
		183
		184	# print "\nPG.pl: $PG_PL<br>\n";
		185	# print "DANGEROUS_MACROS_PL: $DANGEROUS_MACROS_PL<br>\n";
		186	# print "Print dummy environment<br>\n";
		187	# print pretty_print_rh($dummy_envir), "<p>\n\n";
		188
		189	# Read in the source code for the problem
		190
		191	#$INITIAL_MACRO_PACKAGES =~ tr /\r/\n/; # change everything to unix line endings.
		192	$SOURCE1 =~ tr /\r/\n/;
		193	#print STDERR "Source again \n $SOURCE1";
		194	$pt->source_string( $SOURCE1 );
		195
		196	###############################################################################
		197	# Install a safety filter for screening student answers. The default is now the blank
		198	# filter since the answer evaluators do a pretty good job of recompiling and screening
		199	# student's answers. Still, you could prohibit back ticks, or something of the kind.
		200	###############################################################################
		201
		202	$pt ->rf_safety_filter( \&safetyFilter); # install blank safety filter
		203
		204
		205	print STDERR "New PGtranslator object inititialization completed.<br>\n";
		206	################################################################################
		207	## This ends the initialization of the PGtranslator object
		208	################################################################################
		209
		210
		211	################################################################################
		212	# Run the problem (output the html text) but also store it within the object.
		213	# The correct answers are also calculated and stored within the object
		214	################################################################################
		215	$pt ->translate();
		216
		217	#print problem output
22	print "Problem goes here<p>\n";	218	print "Problem goes here<p>\n";
		219	print "Problem output <br>\n";
		220	print "################################################################################<br<br>";
		221	print ${$pt->r_text()};
		222	print "<br><br>################################################################################<br>";
		223	print "<p>End of problem output<br>";
		224
		225
		226	#print source code
		227	print "Source code<pre>\n";
		228	print $SOURCE1;
		229	print "</pre>End source code<p>";
		230	################################################################################
		231	# The format for the output is described here. We'll need a local variable
		232	# to handle the warnings. From within the problem the warning command
		233	# has been slaved to the __WARNINGS__ routine which is defined in Global.
		234	# We'll need to provide an alternate mechanism.
		235	# The base64 encoding is only needed for xml transmission.
		236	################################################################################
		237	print "################################################################################<br>";
		238	print "Warnings output<br>";
		239	my $WARNINGS = "Let this be a warning:";
		240
		241	print $WARNINGS;
		242
		243	################################################################################
		244	# Install the standard problem grader. See gage/xmlrpc/daemon.pm or processProblem8 for detailed
		245	# code on how to choose which problem grader to install, depending on courseEnvironment and problem data.
		246	# See also PG.pl which provides for problem by problem overrides.
		247	################################################################################
		248
		249	$pt->rf_problem_grader($pt->rf_std_problem_grader);
		250
		251	################################################################################
		252	# creates and stores a hash of answer results inside the object: $rh_answer_results
		253	################################################################################
		254	$pt -> process_answers($rh->{envir}->{inputs_ref});
		255
		256
		257	# THE UPDATE AND GRADING LOGIC COULD USE AN OVERHAUL. IT WAS SOMEWHAT CONSTRAINED
		258	# BY LEGACY CONDITIONS IN THE ORIGINAL PROCESSPROBLEM8. IT'S NOT BAD
		259	# BUT IT COULD PROBABLY BE MADE A LITTLE MORE STRAIGHT FORWARD.
		260	################################################################################
		261	# updates the problem state stored by the translator object from the problemEnvironment data
		262	################################################################################
		263
		264	# $pt->rh_problem_state({ recorded_score => $rh->{problem_state}->{recorded_score},
		265	# num_of_correct_ans => $rh->{problem_state}->{num_of_correct_ans} ,
		266	# num_of_incorrect_ans => $rh->{problem_state}->{num_of_incorrect_ans}
		267	# } );
		268	################################################################################
		269	# grade the problem (and update the problem state again.)
		270	################################################################################
		271
		272	# Define an entry order -- the default is the order they are received from the browser.
		273	# (Which as I understand it is NOT guaranteed to be the Left->Right Up-> Down order we're
		274	# used to in the West.
		275
		276	my %PG_FLAGS = $pt->h_flags;
		277	my $ra_answer_entry_order = ( defined($PG_FLAGS{ANSWER_ENTRY_ORDER}) ) ?
		278	$PG_FLAGS{ANSWER_ENTRY_ORDER} : [ keys %{$pt->rh_evaluated_answers} ] ;
		279	# Decide whether any answers were submitted.
		280	my $answers_submitted = 0;
		281	$answers_submitted = 1 if defined( $rh->{answer_form_submitted} ) and 1 == $rh->{answer_form_submitted};
		282	# If there are answers, grade them
		283	my ($rh_problem_result,$rh_problem_state) = $pt->grade_problem( answers_submitted => $answers_submitted,
		284	ANSWER_ENTRY_ORDER => $ra_answer_entry_order
		285	); # grades the problem.
		286
		287	# Output format expected by Webwork.pm (and I believe processProblem8, but check.)
		288	my $out = {
		289	text => ${$pt ->r_text()}, # encode_base64( ${$pt ->r_text()} ),
		290	header_text => $pt->r_header, # encode_base64( ${ $pt->r_header } ),
		291	answers => $pt->rh_evaluated_answers,
		292	errors => $pt-> errors(),
		293	WARNINGS => $WARNINGS, #encode_base64($WARNINGS ),
		294	problem_result => $rh_problem_result,
		295	problem_state => $rh_problem_state,
		296	PG_flag => \%PG_flag
		297	};
		298	##########################################################################################
		299	# Debugging printout of environment tables
		300	##########################################################################################
23		301
24	print "<P>Request item<P>\n\n";	302	print "<P>Request item<P>\n\n";
25	print "<TABLE border=\"3\">";	303	print "<TABLE border=\"3\">";
26	print $self->print_form_data('<tr><td>','</td><td>','</td></tr>');	304	print $self->print_form_data('<tr><td>','</td><td>','</td></tr>');
27	print "</table>\n";	305	print "</table>\n";
		306	print "path info <br>\n";
		307	print $r->path_info();
28	print "<P>\n\ncourseEnvironment<P>\n\n";	308	print "<P>\n\ncourseEnvironment<P>\n\n";
29	print pretty_print_rh($courseEnvironment);	309	print pretty_print_rh($courseEnvironment);
30
31	###########################################################################
32	# The pg problem class should have a method for installing it's problemEnvironment
33	###########################################################################
34
35	$problemEnvir_rh = defineProblemEnvir($self);
36
37	print "<P>\n\nproblemEnvironment<P>\n\n";	310	print "<P>\n\nproblemEnvironment<P>\n\n";
38	print pretty_print_rh($problemEnvir_rh);	311	print pretty_print_rh($problemEnvir_rh);
39	# my $sig = do "pgGenerator.pl" ;	312
40	# print "File not found $1" unless defined(sig);	313	##########################################################################################
41	# print "Errors $@";	314	# End
42	# print pgHTML();	315	##########################################################################################
43
44	"";	316	"";
45	}	317	}
		318	# End the"body" routine for the Problem object.
		319
		320
		321
		322
46		323
47		324
48	########################################################################################	325	########################################################################################
49	# This is the structure that needs to be filled out in order to call PGtranslator;	326	# This is the problemEnvironment structure that needs to be filled out in order to provide
		327	# information to PGtranslator which in turn supports the problem environment
50	########################################################################################	328	########################################################################################
51		329
52	sub defineProblemEnvir {	330	sub defineProblemEnvir {
53	my $self = shift;	331	my $self = shift;
54	my $r = $self->{r};	332	my $r = $self->{r};
…		…
106	# defining directorys and URLs	384	# defining directorys and URLs
107	$envir{'templateDirectory'} = $courseEnvironment ->{courseDirs}->{templates};	385	$envir{'templateDirectory'} = $courseEnvironment ->{courseDirs}->{templates};
108	############ $envir{'classDirectory'} = $Global::classDirectory;	386	############ $envir{'classDirectory'} = $Global::classDirectory;
109	# $envir{'cgiDirectory'} = $Global::cgiDirectory;	387	# $envir{'cgiDirectory'} = $Global::cgiDirectory;
110	# $envir{'cgiURL'} = getWebworkCgiURL();	388	# $envir{'cgiURL'} = getWebworkCgiURL();
111	# $envir{'macroDirectory'} = getCourseMacroDirectory();	389
112	# $envir{'courseScriptsDirectory'} = getCourseScriptsDirectory();
113	$envir{'htmlDirectory'} = $courseEnvironment ->{courseDirectory}->{html};
114	# $envir{'htmlURL'} = getCourseHtmlURL();
115	# $envir{'tempDirectory'} = getCourseTempDirectory();
116	# $envir{'tempURL'} = getCourseTempURL();
117	# $envir{'scriptDirectory'} = $Global::scriptDirectory;##omit	390	# $envir{'scriptDirectory'} = $Global::scriptDirectory;##omit
118	$envir{'webworkDocsURL'} = 'http://webwork.math.rochester.edu';	391	$envir{'webworkDocsURL'} = 'http://webwork.math.rochester.edu';
119	$envir{'externalTTHPath'} = '/usr/local/bin/tth';	392	$envir{'externalTTHPath'} = '/usr/local/bin/tth';
120		393
121		394
…		…
123	$envir{'inputs_ref'} = $r->param;	396	$envir{'inputs_ref'} = $r->param;
124	$envir{'problemSeed'} = 3245;	397	$envir{'problemSeed'} = 3245;
125	$envir{'displaySolutionsQ'} = 1;	398	$envir{'displaySolutionsQ'} = 1;
126	$envir{'displayHintsQ'} = 1;	399	$envir{'displayHintsQ'} = 1;
127		400
		401	# Directory values -- do we really need them here?
		402	$envir{courseScriptsDirectory} = $COURSE_SCRIPTS_DIRECTORY;
		403	$envir{macroDirectory} = $MACRO_DIRECTORY;
		404	$envir{templateDirectory} = $TEMPLATE_DIRECTORY;
		405	$envir{tempDirectory} = $TEMP_DIRECTORY;
		406	$envir{tempURL} = $TEMP_URL;
		407	$envir{htmlURL} = $HTML_URL;
		408	$envir{'htmlDirectory'} = $courseEnvironment ->{courseDirectory}->{html};
128	# here is a way to pass environment variables defined in webworkCourse.ph	409	# here is a way to pass environment variables defined in webworkCourse.ph
129	# my $k;	410	# my $k;
130	# foreach $k (keys %Global::PG_environment ) {	411	# foreach $k (keys %Global::PG_environment ) {
131	# $envir{$k} = $Global::PG_environment{$k};	412	# $envir{$k} = $Global::PG_environment{$k};
132	# }	413	# }
…		…
181	$out = ($@ eq '') ? 1 : 0;	462	$out = ($@ eq '') ? 1 : 0;
182	$@='';	463	$@='';
183	$SIG{__DIE__} = $save_SIG_die_trap;	464	$SIG{__DIE__} = $save_SIG_die_trap;
184	$out;	465	$out;
185	}	466	}
		467
		468	######
		469	# Utility for slurping souce files
		470	#######
		471
		472	sub readFile {
		473	my $input = shift; # The set and problem: 'set0/prob1.pg'
		474	my $filePath =$TEMPLATE_DIRECTORY .$input;
		475	print STDERR "Reading problem from file $filePath \n";
		476	print STDERR "<br>Reading problem from file $filePath <br>\n";
		477	my $out;
		478	print "The file is readable = ", -r $filePath, "\n";
		479	if (-r $filePath) {
		480	open IN, "<$filePath" or print STDERR "Hey, this file was supposed to be readable\n";
		481	local($/)=undef;
		482	$out = <IN>;
		483	close(IN);
		484	} else {
		485	print "Could not read file at \|$filePath\|";
		486	print STDERR "Could not read file at \|$filePath\|";
		487	}
		488	return($out);
		489	}
		490
		491	my $foo =0;
		492
		493	# The warning mechanism. This needs to be turned into an object of its own
		494	###############
		495	## Error message routines cribbed from CGI
		496	###############
		497
		498	BEGIN { #error message routines cribbed from CGI
		499
		500	my $CarpLevel = 0; # How many extra package levels to skip on carp.
		501	my $MaxEvalLen = 0; # How much eval '...text...' to show. 0 = all.
		502
		503	sub longmess {
		504	my $error = shift;
		505	my $mess = "";
		506	my $i = 1 + $CarpLevel;
		507	my ($pack,$file,$line,$sub,$eval,$require);
		508
		509	while (($pack,$file,$line,$sub,undef,undef,$eval,$require) = caller($i++)) {
		510	if ($error =~ m/\n$/) {
		511	$mess .= $error;
		512	}
		513	else {
		514	if (defined $eval) {
		515	if ($require) {
		516	$sub = "require $eval";
		517	}
		518	else {
		519	$eval =~ s/[\\\']/\\$&/g;
		520	if ($MaxEvalLen && length($eval) > $MaxEvalLen) {
		521	substr($eval,$MaxEvalLen) = '...';
		522	}
		523	$sub = "eval '$eval'";
		524	}
		525	}
		526	elsif ($sub eq '(eval)') {
		527	$sub = 'eval {...}';
		528	}
		529
		530	$mess .= "\t$sub " if $error eq "called";
		531	$mess .= "$error at $file line $line\n";
		532	}
		533
		534	$error = "called";
		535	}
		536
		537	$mess \|\| $error;
		538	}
		539	}
		540	###############
		541	### Our error messages for giving maximum feedback to the user for errors within problems.
		542	###############
		543	BEGIN {
		544	sub PG_floating_point_exception_handler { # 1st argument is signal name
		545	my($sig) = @_;
		546	print "Content-type: text/html\n\n<H4>There was a floating point arithmetic error (exception SIG$sig )</H4>--perhaps
		547	you divided by zero or took the square root of a negative number?
		548	<BR>\n Use the back button to return to the previous page and recheck your entries.<BR>\n";
		549	exit(0);
		550	}
		551
		552	$SIG{'FPE'} = \&PG_floating_point_exception_handler;
		553
		554	sub PG_warnings_handler {
		555	my @input = @_;
		556	my $msg_string = longmess(@_);
		557	my @msg_array = split("\n",$msg_string);
		558	my $out_string = '';
		559
		560	# Extra stack information is provided in this next block
		561	# If the warning message does NOT end in \n then a line
		562	# number is appended (see Perl manual about warn function)
		563	# The presence of the line number is detected below and extra
		564	# stack information is added.
		565	# To suppress the line number and the extra stack information
		566	# add \n to the end of a warn message (in .pl files. In .pg
		567	# files add ~~n instead
		568
		569	if ($input[$#input]=~/line \d\.\s$/) {
		570	$out_string .= "##More details: <BR>\n----";
		571	foreach my $line (@msg_array) {
		572	chomp($line);
		573	next unless $line =~/\w+\:\:/;
		574	$out_string .= "----" .$line . "<BR>\n";
		575	}
		576	}
		577
		578	$Global::WARNINGS .="* " . join("<BR>",@input) . "<BR>\n" . $out_string .
		579	"<BR>\n--------------------------------------<BR>\n<BR>\n";
		580	$Global::background_plain_url = $Global::background_warn_url;
		581	$Global::bg_color = '#FF99CC'; #for warnings -- this change may come too late
		582	}
		583
		584	$SIG{__WARN__}=\&PG_warnings_handler;
		585
		586	$SIG{__DIE__} = sub {
		587	my $message = longmess(@_);
		588	$message =~ s/\n/<BR>\n/;
		589	my ($package, $filename, $line) = caller();
		590	# use standard die for errors eminating from XML::Parser::Expat
		591	# it uses a trapped eval which sometimes fails -- apparently on purpose
		592	# and the error is handled by Expat itself. We don't want
		593	# to interfer with that.
		594
		595	if ($package eq 'XML::Parser::Expat') {
		596	die @_;
		597	}
		598	#print "$package $filename $line \n";
		599	print
		600	"Content-type: text/html\r\n\r\n <h4>Software error</h4> <p>\n\n$message\n<p>\n
		601	Please inform the webwork meister.<p>\n
		602	In addition to the error message above the following warnings were detected:
		603	<HR>
		604	$Global::WARNINGS;
		605	<HR>
		606	It's sometimes hard to tell exactly what has gone wrong since the
		607	full error message may have been sent to
		608	standard error instead of to standard out.
		609	<p> To debug you can
		610	<ul>
		611	<li> guess what went wrong and try to fix it.
		612	<li> call the offending script directly from the command line
		613	of unix
		614	<li> enable the debugging features by redefining
		615	\$cgiURL in Global.pm and checking the redirection scripts in
		616	system/cgi. This will force the standard error to be placed
		617	in the standard out pipe as well.
		618	<li> Run tail -f error_log <br>
		619	from the unix command line to see error messages from the webserver.
		620	The standard error output is being placed in the error_log file for the apache
		621	web server. To run this command you have to be in the directory containing the
		622	error_log or enter the full path name of the error_log. <p>
		623	In a standard apache installation, this file is at /usr/local/apache/logs/error_log<p>
		624	In a RedHat Linux installation, this file is at /var/log/httpd/error_log<p>
		625	At Rochester this file is at /ww/logs/error_log.
		626	</ul>
		627	Good luck.<p>\n" ;
		628	};
		629
		630
		631
		632	}
		633
186	1;	634	1;

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