我用apache2运行CGI脚本,我在error.log中有这个警告行(我从输出中删除了所有类似的行):
[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)
为什么这条线路存在并且有办法阻止它们?
发出此警告的代码(摘自“使用Perl进行CGI编程”一书 错误修复):
#!/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;
}
此代码具有类似的输出:
$ 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/
,但没有帮助。
答案 0 :(得分:6)
AFAIK,您只在修改脚本时才会收到这些警告,然后由mod_perl
为有资格进行内联的子例程重新编译脚本。重新编译子例程时,如果返回的值发生更改,则该新值不会反映在以前内联的位置。
如果您更改BUFFER_SIZE
的值,则应重新启动apache
。
我还认为mod_perl / Apache::Registry accidental closures与您的脚本相关。
答案 1 :(得分:1)
据猜测,FOO的第一个定义正在被优化掉。用身体中的语句定义它,我认为你会发现错误消失了。
$ perl -e 'sub FOO () { print 1; } BEGIN{ *FOO = sub () { 2 }; } print FOO;'