【发布时间】：2009-07-31 01:53:07
【问题描述】：
我使用 apache2 运行 CGI 脚本，并且在 error.log 中有此警告行（我从输出中删除了所有类似的行）：
为什么会有这条线，有没有办法阻止它们？
发出此警告的代码（取自“CGI Programming with Perl”一书，其中包含一些 错误已修复）：
#!/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;
}
这段代码有类似的输出：
$ perl -e 'sub FOO () { 1 } BEGIN{ *FOO = sub () { 2 }; } print FOO;'
常量子程序 main::FOO 在 -e 第 1 行重新定义。
我确实没有发出警告 qw/redefine/ 但它没有帮助。
【问题讨论】：
标签： perl cgi warnings mod-perl