mod_perl에서 "Constant"로 "재정의"경고를받는 이유는 무엇입니까?
문제
APACHE2로 CGI 스크립트를 실행 하고이 경고 행이 error.log에 있습니다.출력에서 유사한 라인을 모두 제거했습니다):
[Thu Jul 30 09:39:37 2009] upload.pl: Constant subroutine ModPerl::ROOT::ModPerl::Registry::home_stanislav_cgi_perl_upload_2epl::UPLOAD_DIR redefined at /usr/share/perl/5.10/constant.pm line 115, line 133. Constant subroutine ModPerl::ROOT::ModPerl::Registry::home_stanislav_cgi_perl_upload_2epl::BUFFER_SIZE redefined at /usr/share/perl/5.10/constant.pm line 115, line 133 (#1) [Thu Jul 30 09:39:37 2009] upload.pl: Constant subroutine ModPerl::ROOT::ModPerl::Registry::home_stanislav_cgi_perl_upload_2epl::BUFFER_SIZE redefined at /usr/share/perl/5.10/constant.pm line 115, line 133. Constant subroutine ModPerl::ROOT::ModPerl::Registry::home_stanislav_cgi_perl_upload_2epl::MAX_FILE_SIZE redefined at /usr/share/perl/5.10/constant.pm line 115, line 133 (#1) [Thu Jul 30 09:39:37 2009] upload.pl: Constant subroutine ModPerl::ROOT::ModPerl::Registry::home_stanislav_cgi_perl_upload_2epl::MAX_FILE_SIZE redefined at /usr/share/perl/5.10/constant.pm line 115, line 133. Constant subroutine ModPerl::ROOT::ModPerl::Registry::home_stanislav_cgi_perl_upload_2epl::MAX_DIR_SIZE redefined at /usr/share/perl/5.10/constant.pm line 115, line 133 (#1) [Thu Jul 30 09:39:37 2009] upload.pl: Constant subroutine ModPerl::ROOT::ModPerl::Registry::home_stanislav_cgi_perl_upload_2epl::MAX_DIR_SIZE redefined at /usr/share/perl/5.10/constant.pm line 115, line 133. Constant subroutine ModPerl::ROOT::ModPerl::Registry::home_stanislav_cgi_perl_upload_2epl::MAX_OPEN_TRIES redefined at /usr/share/perl/5.10/constant.pm line 115, line 133 (#1) [Thu Jul 30 09:39:37 2009] upload.pl: Constant subroutine ModPerl::ROOT::ModPerl::Registry::home_stanislav_cgi_perl_upload_2epl::MAX_OPEN_TRIES redefined at /usr/share/perl/5.10/constant.pm line 115, line 133. Subroutine dir_size redefined at /home/stanislav/cgi/perl/upload.pl line 79, line 133 (#2) [Thu Jul 30 09:39:37 2009] upload.pl: Subroutine dir_size redefined at /home/stanislav/cgi/perl/upload.pl line 79, line 133. Subroutine error redefined at /home/stanislav/cgi/perl/upload.pl line 90, line 133 (#2) [Thu Jul 30 09:39:37 2009] upload.pl: Subroutine error redefined at /home/stanislav/cgi/perl/upload.pl line 90, line 133. Argument "" isn't numeric in numeric ge (>=) at /home/stanislav/cgi/perl/upload.pl line 62 (#4) [Thu Jul 30 09:39:37 2009] -e: Argument "" isn't numeric in numeric ge (>=) at /home/stanislav/cgi/perl/upload.pl line 62. Filehandle OUTPUT opened only for input at /home/stanislav/cgi/perl/upload.pl line 69 (#5) [Thu Jul 30 09:39:37 2009] -e: Filehandle OUTPUT opened only for input at /home/stanislav/cgi/perl/upload.pl line 69. Constant subroutine ModPerl::ROOT::ModPerl::Registry::home_stanislav_cgi_perl_upload_2epl::UPLOAD_DIR redefined at /usr/share/perl/5.10/constant.pm line 115, line 133 (#1)
왜이 줄이 거기에 있고 그들을 막을 수있는 방법이 있습니까?
이 경고를 만드는 코드 (일부 버그가 고정 된 "CGI 프로그래밍"에서 가져온) :
#!/usr/bin/perl
use strict;
use warnings;
use CGI;
use CGI::Carp;
#use diagnostics qw/-verbose/;
use Fcntl qw( :DEFAULT :flock );
use constant UPLOAD_DIR => "/tmp/test_upload/";
use constant BUFFER_SIZE => 16_384;
use constant MAX_FILE_SIZE => 1_048_576; # Limit each upload to 1 MB
use constant MAX_DIR_SIZE => 100 * 1_048_576; # Limit total uploads to 100 MB
use constant MAX_OPEN_TRIES => 100;
$CGI::DISABLE_UPLOADS = 0;
$CGI::POST_MAX = MAX_FILE_SIZE;
my $q = new CGI;
$q->cgi_error and error( $q, "Error transferring file: " . $q->cgi_error );
my $file = $q->param( "file" ) || error( $q, "No file received." );
my $filename = $q->param( "filename" ) || error( $q, "No filename entered." );
my $fh = $q->upload( "file" ) || error( $q, "Something is wrong with file handle." );
#my $fh = $q->upload( $file );
my $buffer = "";
if ( dir_size( UPLOAD_DIR ) + $ENV{CONTENT_LENGTH} > MAX_DIR_SIZE ) {
error( $q, "Upload directory is full." );
}
# Allow letters, digits, periods, underscores, dashes
# Convert anything else to an underscore
$filename =~ s/[^\w.-]/_/g;
if ( $filename =~ /^(\w[\w.-]*)/ ) {
$filename = $1;
}
else {
error( $q, "Invalid file name; files must start with a letter or number." );
}
# Open output file, making sure the name is unique
until ( sysopen OUTPUT, UPLOAD_DIR . $filename, O_CREAT | O_EXCL ) {
$filename =~ s/(\d*)(\.\w+)$/($1||0) + 1 . $2/e;
$1 >= MAX_OPEN_TRIES and error( $q, "Unable to save your file." );
}
# This is necessary for non-Unix systems; does nothing on Unix
binmode $fh;
binmode OUTPUT;
# Write contents to output file
while ( read( $fh, $buffer, BUFFER_SIZE ) ) {
print OUTPUT $buffer;
}
close OUTPUT;
if ( -T $fh ) {
print $q->header("text/plain");
seek $fh, 0, 0;
map { print } ;
}
sub dir_size {
my $dir = shift;
my $dir_size = 0;
# Loop through files and sum the sizes; doesn't descend down subdirs
opendir DIR, $dir or die "Unable to open $dir: $!";
while ( $_ = readdir DIR ) {
$dir_size += -s "$dir/$_";
}
return $dir_size;
}
sub error {
my( $q, $reason ) = @_;
print $q->header( "text/html" ),
$q->start_html( "Error" ),
$q->h1( "Error" ),
$q->p( "Your upload was not procesed because the following error ",
"occured: " ),
$q->p( $q->i( $reason ) ),
$q->end_html;
exit;
}
이 코드에는 유사한 출력이 있습니다.$ perl -e 'sub FOO () { 1 } BEGIN{ *FOO = sub () { 2 }; } print FOO;'
Constant subroutine main::FOO redefined at -e line 1.
I did put no warnings qw/redefine/
그러나 그것은 도움이되지 않았습니다.
해결책
Afaik, 스크립트를 수정 한 다음 스크립트가 다시 컴파일 될 때만 이러한 경고를받습니다. mod_perl
인라인에 적합한 서브 루틴의 경우. 서브 루틴이 다시 컴파일되면, 반환 된 값이 변경되면, 해당 새 값은 이전에 상환 된 장소에 반영되지 않습니다.
값을 변경하면 BUFFER_SIZE
, 당신은 다시 시작해야합니다 apache
.
나도 생각합니다 mod_perl / apache :: 레지스트리 우발적 인 폐쇄 스크립트와 관련이 있습니다.
다른 팁
추측 할 때, FOO의 첫 번째 정의는 최적화되고 있습니다. 신체의 진술로 정의하면 오류가 사라질 것 같습니다.
$ perl -e 'sub FOO () { print 1; } BEGIN{ *FOO = sub () { 2 }; } print FOO;'
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