FM / 5.34.0

/usr/lib/x86_64-linux-gnu/perl/5.34.0/

/usr/lib/x86_64-linux-gnu/perl/5.34.0

Name	Size	Mode	Actions
asm/	-	0755	rm
asm-generic/	-	0755	rm
auto/	-	0755	rm
B/	-	0755	rm
bits/	-	0755	rm
Compress/	-	0755	rm
CORE/	-	0755	rm
Data/	-	0755	rm
Devel/	-	0755	rm
Digest/	-	0755	rm
Encode/	-	0755	rm
File/	-	0755	rm
Filter/	-	0755	rm
gnu/	-	0755	rm
Hash/	-	0755	rm
I18N/	-	0755	rm
IO/	-	0755	rm
IPC/	-	0755	rm
linux/	-	0755	rm
List/	-	0755	rm
machine/	-	0755	rm
Math/	-	0755	rm
MIME/	-	0755	rm
PerlIO/	-	0755	rm
Scalar/	-	0755	rm
Sub/	-	0755	rm
Sys/	-	0755	rm
sys/	-	0755	rm
threads/	-	0755	rm
Time/	-	0755	rm
Unicode/	-	0755	rm
attributes.pm	16353	0644	edit dl rm
B.pm	30093	0644	edit dl rm
Config.pm	3217	0644	edit dl rm
Config.pod	256066	0644	edit dl rm
Config_git.pl	409	0644	edit dl rm
Config_heavy.pl	55332	0644	edit dl rm
Cwd.pm	21942	0644	edit dl rm
DB_File.pm	67004	0644	edit dl rm
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encoding.pm	22950	0644	edit dl rm
endian.ph	3627	0644	edit dl rm
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features.ph	14995	0644	edit dl rm
GDBM_File.pm	7788	0644	edit dl rm
IO.pm	1462	0644	edit dl rm
lib.pm	6136	0644	edit dl rm
mro.pm	9846	0644	edit dl rm
NDBM_File.pm	3084	0644	edit dl rm
O.pm	4291	0644	edit dl rm
ODBM_File.pm	2970	0644	edit dl rm
Opcode.pm	16282	0644	edit dl rm
ops.pm	997	0644	edit dl rm
POSIX.pm	20384	0644	edit dl rm
POSIX.pod	82515	0644	edit dl rm
re.pm	28657	0644	edit dl rm
SDBM_File.pm	3809	0644	edit dl rm
signal.ph	3700	0644	edit dl rm
Socket.pm	37027	0644	edit dl rm
stdarg.ph	2870	0644	edit dl rm
stdc-predef.ph	1220	0644	edit dl rm
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wait.ph	83	0644	edit dl rm
_h2ph_pre.ph	31302	0644	edit dl rm

Edit: /usr/lib/x86_64-linux-gnu/perl/5.34.0/NDBM_File.pm (3084B)

package NDBM_File;

use strict;
use warnings;

require Tie::Hash;
require XSLoader;

our @ISA = qw(Tie::Hash);
our $VERSION = "1.15";

XSLoader::load();

__END__

=head1 NAME

NDBM_File - Tied access to ndbm files

=head1 SYNOPSIS

use Fcntl;   # For O_RDWR, O_CREAT, etc.
  use NDBM_File;

tie(%h, 'NDBM_File', 'filename', O_RDWR|O_CREAT, 0666)
    or die "Couldn't tie NDBM file 'filename': $!; aborting";

# Now read and change the hash
  $h{newkey} = newvalue;
  print $h{oldkey};
  ...

untie %h;

=head1 DESCRIPTION

C<NDBM_File> establishes a connection between a Perl hash variable and
a file in NDBM_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.

Use C<NDBM_File> with the Perl built-in C<tie> function to establish
the connection between the variable and the file.  The arguments to
C<tie> should be:

=over 4

=item 1.

The hash variable you want to tie.

=item 2.

The string C<"NDBM_File">.  (Ths tells Perl to use the C<NDBM_File>
package to perform the functions of the hash.)

=item 3.

The name of the file you want to tie to the hash.

=item 4.

Flags.  Use one of:

=over 2

=item C<O_RDONLY>

Read-only access to the data in the file.

=item C<O_WRONLY>

Write-only access to the data in the file.

=item C<O_RDWR>

Both read and write access.

=back

If you want to create the file if it does not exist, add C<O_CREAT> to
any of these, as in the example.  If you omit C<O_CREAT> and the file
does not already exist, the C<tie> call will fail.

=item 5.

The default permissions to use if a new file is created.  The actual
permissions will be modified by the user's umask, so you should
probably use 0666 here. (See L<perlfunc/umask>.)

=back

=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<ndbm 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 SECURITY AND PORTABILITY

B<Do not accept NDBM files from untrusted sources.>

On modern Linux systems these are typically GDBM files, which are not
portable across platforms.

The GDBM documentation doesn't imply that files from untrusted sources
can be safely used with C<libgdbm>.

Systems that don't use GDBM compatibilty for ndbm support will be
using a platform specific library, possibly inherited from BSD
systems, where it may or may not be safe to use an untrusted file.

A maliciously crafted file might cause perl to crash or even expose a
security vulnerability.

=head1 BUGS AND WARNINGS

There are a number of limits on the size of the data that you can
store in the NDBM file.  The most important is that the length of a
key, plus the length of its associated value, may not exceed 1008
bytes.

See L<perlfunc/tie>, L<perldbmfilter>, L<Fcntl>

=cut

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