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home/
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../
lib64/
bpf/
../
gems/
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./
python3.6/
../
perl5/
SDBM_File.pm/
/
package SDBM_File;
use strict; use warnings;
require Tie::Hash; require XSLoader;
our @ISA = qw(Tie::Hash); our $VERSION = "1.14";
our @EXPORT_OK = qw(PAGFEXT DIRFEXT PAIRMAX); use Exporter "import";
XSLoader::load();
1;
__END__
=head1 NAME
SDBM_File - Tied access to sdbm files
=head1 SYNOPSIS
use Fcntl; # For O_RDWR, O_CREAT, etc. use SDBM_File;
tie(%h, 'SDBM_File', 'filename', O_RDWR|O_CREAT, 0666) or die "Couldn't tie SDBM file 'filename': $!; aborting";
# Now read and change the hash $h{newkey} = newvalue; print $h{oldkey}; ...
untie %h;
=head1 DESCRIPTION
C<SDBM_File> establishes a connection between a Perl hash variable and a file in SDBM_File format. You can manipulate the data in the file just as if it were in a Perl hash, but when your program exits, the data will remain in the file, to be used the next time your program runs.
=head2 Tie
Use C<SDBM_File> with the Perl built-in C<tie> function to establish the connection between the variable and the file.
tie %hash, 'SDBM_File', $basename, $modeflags, $perms;
tie %hash, 'SDBM_File', $dirfile, $modeflags, $perms, $pagfilename;
C<$basename> is the base filename for the database. The database is two files with ".dir" and ".pag" extensions appended to C<$basename>,
$basename.dir (or .sdbm_dir on VMS, per DIRFEXT constant) $basename.pag
The two filenames can also be given separately in full as C<$dirfile> and C<$pagfilename>. This suits for two files without ".dir" and ".pag" extensions, perhaps for example two files from L<File::Temp>.
C<$modeflags> can be the following constants from the C<Fcntl> module (in the style of the L<open(2)> system call),
If you want to create the file if it does not already exist then bitwise-OR (C<|>) C<O_CREAT> too. If you omit C<O_CREAT> and the database does not already exist then the C<tie> call will fail.
O_CREAT create database if doesn't already exist
C<$perms> is the file permissions bits to use if new database files are created. This parameter is mandatory even when not creating a new database. The permissions will be reduced by the user's umask so the usual value here would be 0666, or if some very private data then 0600. (See L<perlfunc/umask>.)
=head1 EXPORTS
SDBM_File optionally exports the following constants:
=over
=item *
C<PAGFEXT> - the extension used for the page file, usually C<.pag>.
=item *
C<DIRFEXT> - the extension used for the directory file, C<.dir> everywhere but VMS, where it is C<.sdbm_dir>.
=item *
C<PAIRMAX> - the maximum size of a stored hash entry, including the length of both the key and value.
=back
These constants can also be used with fully qualified names, eg. C<SDBM_File::PAGFEXT>.
=head1 DIAGNOSTICS
On failure, the C<tie> call returns an undefined value and probably sets C<$!> to contain the reason the file could not be tied.
=head2 C<sdbm store returned -1, errno 22, key "..." at ...>
This warning is emitted when you try to store a key or a value that is too long. It means that the change was not recorded in the database. See BUGS AND WARNINGS below.
=head1 BUGS AND WARNINGS
There are a number of limits on the size of the data that you can store in the SDBM file. The most important is that the length of a key, plus the length of its associated value, may not exceed 1008 bytes.