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 PK�����[7�Zj[{��{����SysV.pmnu��[�����������################################################################################
#
#  Version 2.x, Copyright (C) 2007-2013, Marcus Holland-Moritz <mhx@cpan.org>.
#  Version 1.x, Copyright (C) 1997, Graham Barr <gbarr@pobox.com>.
#
#  This program is free software; you can redistribute it and/or
#  modify it under the same terms as Perl itself.
#
################################################################################

package IPC::SysV;

use strict;
use vars qw(@ISA @EXPORT @EXPORT_OK %EXPORT_TAGS $VERSION $AUTOLOAD);
use Carp;
use Config;

require Exporter;
@ISA = qw(Exporter);

$VERSION = '2.07';

# To support new constants, just add them to @EXPORT_OK
# and the C/XS code will be generated automagically.
@EXPORT_OK = (qw(

  GETALL GETNCNT GETPID GETVAL GETZCNT

  IPC_ALLOC IPC_CREAT IPC_EXCL IPC_GETACL IPC_INFO IPC_LOCKED
  IPC_M IPC_NOERROR IPC_NOWAIT IPC_PRIVATE IPC_R IPC_RMID
  IPC_SET IPC_SETACL IPC_SETLABEL IPC_STAT IPC_W IPC_WANTED

  MSG_EXCEPT MSG_FWAIT MSG_INFO MSG_LOCKED MSG_MWAIT MSG_NOERROR
  MSG_QWAIT MSG_R MSG_RWAIT MSG_STAT MSG_W MSG_WAIT MSG_WWAIT

  SEM_A SEM_ALLOC SEM_DEST SEM_ERR SEM_INFO SEM_ORDER SEM_R
  SEM_STAT SEM_UNDO

  SETALL SETVAL

  SHMLBA

  SHM_A SHM_CLEAR SHM_COPY SHM_DCACHE SHM_DEST SHM_ECACHE
  SHM_FMAP SHM_HUGETLB SHM_ICACHE SHM_INFO SHM_INIT SHM_LOCK
  SHM_LOCKED SHM_MAP SHM_NORESERVE SHM_NOSWAP SHM_R SHM_RDONLY
  SHM_REMAP SHM_REMOVED SHM_RND SHM_SHARE_MMU SHM_SHATTR
  SHM_SIZE SHM_STAT SHM_UNLOCK SHM_W

  S_IRUSR S_IWUSR S_IXUSR S_IRWXU
  S_IRGRP S_IWGRP S_IXGRP S_IRWXG
  S_IROTH S_IWOTH S_IXOTH S_IRWXO

  ENOSPC ENOSYS ENOMEM EACCES

), qw(

  ftok shmat shmdt memread memwrite

));

%EXPORT_TAGS = (
  all => [@EXPORT, @EXPORT_OK],
);

sub AUTOLOAD
{
  my $constname = $AUTOLOAD;
  $constname =~ s/.*:://;
  die "&IPC::SysV::_constant not defined" if $constname eq '_constant';
  my ($error, $val) = _constant($constname);
  if ($error) {
    my (undef, $file, $line) = caller;
    die "$error at $file line $line.\n";
  }
  {
    no strict 'refs';
    *$AUTOLOAD = sub { $val };
  }
  goto &$AUTOLOAD;
}

BOOT_XS: {
  # If I inherit DynaLoader then I inherit AutoLoader and I DON'T WANT TO
  require DynaLoader;

  # DynaLoader calls dl_load_flags as a static method.
  *dl_load_flags = DynaLoader->can('dl_load_flags');

  do {
    __PACKAGE__->can('bootstrap') || \&DynaLoader::bootstrap
  }->(__PACKAGE__, $VERSION);
}

1;

__END__

=head1 NAME

IPC::SysV - System V IPC constants and system calls

=head1 SYNOPSIS

  use IPC::SysV qw(IPC_STAT IPC_PRIVATE);

=head1 DESCRIPTION

C<IPC::SysV> defines and conditionally exports all the constants
defined in your system include files which are needed by the SysV
IPC calls.  Common ones include

  IPC_CREAT IPC_EXCL IPC_NOWAIT IPC_PRIVATE IPC_RMID IPC_SET IPC_STAT
  GETVAL SETVAL GETPID GETNCNT GETZCNT GETALL SETALL
  SEM_A SEM_R SEM_UNDO
  SHM_RDONLY SHM_RND SHMLBA

and auxiliary ones

  S_IRUSR S_IWUSR S_IRWXU
  S_IRGRP S_IWGRP S_IRWXG
  S_IROTH S_IWOTH S_IRWXO

but your system might have more.

=over 4

=item ftok( PATH )

=item ftok( PATH, ID )

Return a key based on PATH and ID, which can be used as a key for
C<msgget>, C<semget> and C<shmget>. See L<ftok(3)>.

If ID is omitted, it defaults to C<1>. If a single character is
given for ID, the numeric value of that character is used.

=item shmat( ID, ADDR, FLAG )

Attach the shared memory segment identified by ID to the address
space of the calling process. See L<shmat(2)>.

ADDR should be C<undef> unless you really know what you're doing.

=item shmdt( ADDR )

Detach the shared memory segment located at the address specified
by ADDR from the address space of the calling process. See L<shmdt(2)>.

=item memread( ADDR, VAR, POS, SIZE )

Reads SIZE bytes from a memory segment at ADDR starting at position POS.
VAR must be a variable that will hold the data read. Returns true if
successful, or false if there is an error. memread() taints the variable.

=item memwrite( ADDR, STRING, POS, SIZE )

Writes SIZE bytes from STRING to a memory segment at ADDR starting at
position POS. If STRING is too long, only SIZE bytes are used; if STRING
is too short, nulls are written to fill out SIZE bytes. Returns true if
successful, or false if there is an error.

=back

=head1 SEE ALSO

L<IPC::Msg>, L<IPC::Semaphore>, L<IPC::SharedMem>, L<ftok(3)>, L<shmat(2)>, L<shmdt(2)>

=head1 AUTHORS

Graham Barr <gbarr@pobox.com>,
Jarkko Hietaniemi <jhi@iki.fi>,
Marcus Holland-Moritz <mhx@cpan.org>

=head1 COPYRIGHT

Version 2.x, Copyright (C) 2007-2013, Marcus Holland-Moritz.

Version 1.x, Copyright (c) 1997, Graham Barr.

This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.

=cut

PK�����\7�Zo�!'������Semaphore.pmnu��[�����������################################################################################
#
#  Version 2.x, Copyright (C) 2007-2013, Marcus Holland-Moritz <mhx@cpan.org>.
#  Version 1.x, Copyright (C) 1997, Graham Barr <gbarr@pobox.com>.
#
#  This program is free software; you can redistribute it and/or
#  modify it under the same terms as Perl itself.
#
################################################################################

package IPC::Semaphore;

use IPC::SysV qw(GETNCNT GETZCNT GETVAL SETVAL GETPID GETALL SETALL
		 IPC_STAT IPC_SET IPC_RMID);
use strict;
use vars qw($VERSION);
use Carp;

$VERSION = '2.07';

# Figure out if we have support for native sized types
my $N = do { my $foo = eval { pack "L!", 0 }; $@ ? '' : '!' };

{
    package IPC::Semaphore::stat;

    use Class::Struct qw(struct);

    struct 'IPC::Semaphore::stat' => [
	uid	=> '$',
	gid	=> '$',
	cuid	=> '$',
	cgid	=> '$',
	mode	=> '$',
	ctime	=> '$',
	otime	=> '$',
	nsems	=> '$',
    ];
}

sub new {
    @_ == 4 || croak 'new ' . __PACKAGE__ . '( KEY, NSEMS, FLAGS )';
    my $class = shift;

    my $id = semget($_[0],$_[1],$_[2]);

    defined($id)
	? bless \$id, $class
	: undef;
}

sub id {
    my $self = shift;
    $$self;
}

sub remove {
    my $self = shift;
    my $result = semctl($$self,0,IPC_RMID,0);
    undef $$self;
    $result;
}

sub getncnt {
    @_ == 2 || croak '$sem->getncnt( SEM )';
    my $self = shift;
    my $sem = shift;
    my $v = semctl($$self,$sem,GETNCNT,0);
    $v ? 0 + $v : undef;
}

sub getzcnt {
    @_ == 2 || croak '$sem->getzcnt( SEM )';
    my $self = shift;
    my $sem = shift;
    my $v = semctl($$self,$sem,GETZCNT,0);
    $v ? 0 + $v : undef;
}

sub getval {
    @_ == 2 || croak '$sem->getval( SEM )';
    my $self = shift;
    my $sem = shift;
    my $v = semctl($$self,$sem,GETVAL,0);
    $v ? 0 + $v : undef;
}

sub getpid {
    @_ == 2 || croak '$sem->getpid( SEM )';
    my $self = shift;
    my $sem = shift;
    my $v = semctl($$self,$sem,GETPID,0);
    $v ? 0 + $v : undef;
}

sub op {
    @_ >= 4 || croak '$sem->op( OPLIST )';
    my $self = shift;
    croak 'Bad arg count' if @_ % 3;
    my $data = pack("s$N*",@_);
    semop($$self,$data);
}

sub stat {
    my $self = shift;
    my $data = "";
    semctl($$self,0,IPC_STAT,$data)
	or return undef;
    IPC::Semaphore::stat->new->unpack($data);
}

sub set {
    my $self = shift;
    my $ds;

    if(@_ == 1) {
	$ds = shift;
    }
    else {
	croak 'Bad arg count' if @_ % 2;
	my %arg = @_;
	$ds = $self->stat
		or return undef;
	my($key,$val);
	$ds->$key($val)
	    while(($key,$val) = each %arg);
    }

    my $v = semctl($$self,0,IPC_SET,$ds->pack);
    $v ? 0 + $v : undef;
}

sub getall {
    my $self = shift;
    my $data = "";
    semctl($$self,0,GETALL,$data)
	or return ();
    (unpack("s$N*",$data));
}

sub setall {
    my $self = shift;
    my $data = pack("s$N*",@_);
    semctl($$self,0,SETALL,$data);
}

sub setval {
    @_ == 3 || croak '$sem->setval( SEM, VAL )';
    my $self = shift;
    my $sem = shift;
    my $val = shift;
    semctl($$self,$sem,SETVAL,$val);
}

1;

__END__

=head1 NAME

IPC::Semaphore - SysV Semaphore IPC object class

=head1 SYNOPSIS

    use IPC::SysV qw(IPC_PRIVATE S_IRUSR S_IWUSR IPC_CREAT);
    use IPC::Semaphore;

    $sem = IPC::Semaphore->new(IPC_PRIVATE, 10, S_IRUSR | S_IWUSR | IPC_CREAT);

    $sem->setall( (0) x 10);

    @sem = $sem->getall;

    $ncnt = $sem->getncnt;

    $zcnt = $sem->getzcnt;

    $ds = $sem->stat;

    $sem->remove;

=head1 DESCRIPTION

A class providing an object based interface to SysV IPC semaphores.

=head1 METHODS

=over 4

=item new ( KEY , NSEMS , FLAGS )

Create a new semaphore set associated with C<KEY>. C<NSEMS> is the number
of semaphores in the set. A new set is created if

=over 4

=item *

C<KEY> is equal to C<IPC_PRIVATE>

=item *

C<KEY> does not already have a semaphore identifier
associated with it, and C<I<FLAGS> & IPC_CREAT> is true.

=back

On creation of a new semaphore set C<FLAGS> is used to set the
permissions.  Be careful not to set any flags that the Sys V
IPC implementation does not allow: in some systems setting
execute bits makes the operations fail.

=item getall

Returns the values of the semaphore set as an array.

=item getncnt ( SEM )

Returns the number of processes waiting for the semaphore C<SEM> to
become greater than its current value

=item getpid ( SEM )

Returns the process id of the last process that performed an operation
on the semaphore C<SEM>.

=item getval ( SEM )

Returns the current value of the semaphore C<SEM>.

=item getzcnt ( SEM )

Returns the number of processes waiting for the semaphore C<SEM> to
become zero.

=item id

Returns the system identifier for the semaphore set.

=item op ( OPLIST )

C<OPLIST> is a list of operations to pass to C<semop>. C<OPLIST> is
a concatenation of smaller lists, each which has three values. The
first is the semaphore number, the second is the operation and the last
is a flags value. See L<semop(2)> for more details. For example

    $sem->op(
	0, -1, IPC_NOWAIT,
	1,  1, IPC_NOWAIT
    );

=item remove

Remove and destroy the semaphore set from the system.

=item set ( STAT )

=item set ( NAME => VALUE [, NAME => VALUE ...] )

C<set> will set the following values of the C<stat> structure associated
with the semaphore set.

    uid
    gid
    mode (only the permission bits)

C<set> accepts either a stat object, as returned by the C<stat> method,
or a list of I<name>-I<value> pairs.

=item setall ( VALUES )

Sets all values in the semaphore set to those given on the C<VALUES> list.
C<VALUES> must contain the correct number of values.

=item setval ( N , VALUE )

Set the C<N>th value in the semaphore set to C<VALUE>

=item stat

Returns an object of type C<IPC::Semaphore::stat> which is a sub-class of
C<Class::Struct>. It provides the following fields. For a description
of these fields see your system documentation.

    uid
    gid
    cuid
    cgid
    mode
    ctime
    otime
    nsems

=back

=head1 SEE ALSO

L<IPC::SysV>, L<Class::Struct>, L<semget(2)>, L<semctl(2)>, L<semop(2)>

=head1 AUTHORS

Graham Barr <gbarr@pobox.com>,
Marcus Holland-Moritz <mhx@cpan.org>

=head1 COPYRIGHT

Version 2.x, Copyright (C) 2007-2013, Marcus Holland-Moritz.

Version 1.x, Copyright (c) 1997, Graham Barr.

This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.

=cut
PK�����\7�Zڵ�`��������Msg.pmnu��[�����������################################################################################
#
#  Version 2.x, Copyright (C) 2007-2013, Marcus Holland-Moritz <mhx@cpan.org>.
#  Version 1.x, Copyright (C) 1997, Graham Barr <gbarr@pobox.com>.
#
#  This program is free software; you can redistribute it and/or
#  modify it under the same terms as Perl itself.
#
################################################################################

package IPC::Msg;

use IPC::SysV qw(IPC_STAT IPC_SET IPC_RMID);
use strict;
use vars qw($VERSION);
use Carp;

$VERSION = '2.07';

# Figure out if we have support for native sized types
my $N = do { my $foo = eval { pack "L!", 0 }; $@ ? '' : '!' };

{
    package IPC::Msg::stat;

    use Class::Struct qw(struct);

    struct 'IPC::Msg::stat' => [
	uid	=> '$',
	gid	=> '$',
	cuid	=> '$',
	cgid	=> '$',
	mode	=> '$',
	qnum	=> '$',
	qbytes	=> '$',
	lspid	=> '$',
	lrpid	=> '$',
	stime	=> '$',
	rtime	=> '$',
	ctime	=> '$',
    ];
}

sub new {
    @_ == 3 || croak 'new IPC::Msg ( KEY , FLAGS )';
    my $class = shift;

    my $id = msgget($_[0],$_[1]);

    defined($id)
	? bless \$id, $class
	: undef;
}

sub id {
    my $self = shift;
    $$self;
}

sub stat {
    my $self = shift;
    my $data = "";
    msgctl($$self,IPC_STAT,$data) or
	return undef;
    IPC::Msg::stat->new->unpack($data);
}

sub set {
    my $self = shift;
    my $ds;

    if(@_ == 1) {
	$ds = shift;
    }
    else {
	croak 'Bad arg count' if @_ % 2;
	my %arg = @_;
	$ds = $self->stat
		or return undef;
	my($key,$val);
	$ds->$key($val)
	    while(($key,$val) = each %arg);
    }

    msgctl($$self,IPC_SET,$ds->pack);
}

sub remove {
    my $self = shift;
    (msgctl($$self,IPC_RMID,0), undef $$self)[0];
}

sub rcv {
    @_ <= 5 && @_ >= 3 or croak '$msg->rcv( BUF, LEN, TYPE, FLAGS )';
    my $self = shift;
    my $buf = "";
    msgrcv($$self,$buf,$_[1],$_[2] || 0, $_[3] || 0) or
	return;
    my $type;
    ($type,$_[0]) = unpack("l$N a*",$buf);
    $type;
}

sub snd {
    @_ <= 4 && @_ >= 3 or  croak '$msg->snd( TYPE, BUF, FLAGS )';
    my $self = shift;
    msgsnd($$self,pack("l$N a*",$_[0],$_[1]), $_[2] || 0);
}


1;

__END__

=head1 NAME

IPC::Msg - SysV Msg IPC object class

=head1 SYNOPSIS

    use IPC::SysV qw(IPC_PRIVATE S_IRUSR S_IWUSR);
    use IPC::Msg;

    $msg = IPC::Msg->new(IPC_PRIVATE, S_IRUSR | S_IWUSR);

    $msg->snd($msgtype, $msgdata);

    $msg->rcv($buf, 256);

    $ds = $msg->stat;

    $msg->remove;

=head1 DESCRIPTION

A class providing an object based interface to SysV IPC message queues.

=head1 METHODS

=over 4

=item new ( KEY , FLAGS )

Creates a new message queue associated with C<KEY>. A new queue is
created if

=over 4

=item *

C<KEY> is equal to C<IPC_PRIVATE>

=item *

C<KEY> does not already have a message queue associated with
it, and C<I<FLAGS> & IPC_CREAT> is true.

=back

On creation of a new message queue C<FLAGS> is used to set the
permissions.  Be careful not to set any flags that the Sys V
IPC implementation does not allow: in some systems setting
execute bits makes the operations fail.

=item id

Returns the system message queue identifier.

=item rcv ( BUF, LEN [, TYPE [, FLAGS ]] )

Read a message from the queue. Returns the type of the message read.
See L<msgrcv(2)>.  The BUF becomes tainted.

=item remove

Remove and destroy the message queue from the system.

=item set ( STAT )

=item set ( NAME => VALUE [, NAME => VALUE ...] )

C<set> will set the following values of the C<stat> structure associated
with the message queue.

    uid
    gid
    mode (oly the permission bits)
    qbytes

C<set> accepts either a stat object, as returned by the C<stat> method,
or a list of I<name>-I<value> pairs.

=item snd ( TYPE, MSG [, FLAGS ] )

Place a message on the queue with the data from C<MSG> and with type C<TYPE>.
See L<msgsnd(2)>.

=item stat

Returns an object of type C<IPC::Msg::stat> which is a sub-class of
C<Class::Struct>. It provides the following fields. For a description
of these fields see you system documentation.

    uid
    gid
    cuid
    cgid
    mode
    qnum
    qbytes
    lspid
    lrpid
    stime
    rtime
    ctime

=back

=head1 SEE ALSO

L<IPC::SysV>, L<Class::Struct>

=head1 AUTHORS

Graham Barr <gbarr@pobox.com>,
Marcus Holland-Moritz <mhx@cpan.org>

=head1 COPYRIGHT

Version 2.x, Copyright (C) 2007-2013, Marcus Holland-Moritz.

Version 1.x, Copyright (c) 1997, Graham Barr.

This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.

=cut

PK�����]7�Z�Y���������SharedMem.pmnu��[�����������################################################################################
#
#  Version 2.x, Copyright (C) 2007-2013, Marcus Holland-Moritz <mhx@cpan.org>.
#  Version 1.x, Copyright (C) 1997, Graham Barr <gbarr@pobox.com>.
#
#  This program is free software; you can redistribute it and/or
#  modify it under the same terms as Perl itself.
#
################################################################################

package IPC::SharedMem;

use IPC::SysV qw(IPC_STAT IPC_RMID shmat shmdt memread memwrite);
use strict;
use vars qw($VERSION);
use Carp;

$VERSION = '2.07';

# Figure out if we have support for native sized types
my $N = do { my $foo = eval { pack "L!", 0 }; $@ ? '' : '!' };

{
    package IPC::SharedMem::stat;

    use Class::Struct qw(struct);

    struct 'IPC::SharedMem::stat' => [
	uid	=> '$',
	gid	=> '$',
	cuid	=> '$',
	cgid	=> '$',
	mode	=> '$',
	segsz	=> '$',
	lpid	=> '$',
	cpid	=> '$',
	nattch	=> '$',
	atime	=> '$',
	dtime	=> '$',
	ctime	=> '$',
    ];
}

sub new
{
  @_ == 4 or croak 'IPC::SharedMem->new(KEY, SIZE, FLAGS)';
  my($class, $key, $size, $flags) = @_;

  my $id = shmget $key, $size, $flags;

  return undef unless defined $id;

  bless { _id => $id, _addr => undef, _isrm => 0 }, $class
}

sub id
{
  my $self = shift;
  $self->{_id};
}

sub addr
{
  my $self = shift;
  $self->{_addr};
}

sub stat
{
  my $self = shift;
  my $data = '';
  shmctl $self->id, IPC_STAT, $data or return undef;
  IPC::SharedMem::stat->new->unpack($data);
}

sub attach
{
  @_ >= 1 && @_ <= 2 or croak '$shm->attach([FLAG])';
  my($self, $flag) = @_;
  defined $self->addr and return undef;
  $self->{_addr} = shmat($self->id, undef, $flag || 0);
  defined $self->addr;
}

sub detach
{
  my $self = shift;
  defined $self->addr or return undef;
  my $rv = defined shmdt($self->addr);
  undef $self->{_addr} if $rv;
  $rv;
}

sub remove
{
  my $self = shift;
  return undef if $self->is_removed;
  my $rv = shmctl $self->id, IPC_RMID, 0;
  $self->{_isrm} = 1 if $rv;
  return $rv;
}

sub is_removed
{
  my $self = shift;
  $self->{_isrm};
}

sub read
{
  @_ == 3 or croak '$shm->read(POS, SIZE)';
  my($self, $pos, $size) = @_;
  my $buf = '';
  if (defined $self->addr) {
    memread($self->addr, $buf, $pos, $size) or return undef;
  }
  else {
    shmread($self->id, $buf, $pos, $size) or return undef;
  }
  $buf;
}

sub write
{
  @_ == 4 or croak '$shm->write(STRING, POS, SIZE)';
  my($self, $str, $pos, $size) = @_;
  if (defined $self->addr) {
    return memwrite($self->addr, $str, $pos, $size);
  }
  else {
    return shmwrite($self->id, $str, $pos, $size);
  }
}

1;

__END__

=head1 NAME

IPC::SharedMem - SysV Shared Memory IPC object class

=head1 SYNOPSIS

    use IPC::SysV qw(IPC_PRIVATE S_IRUSR S_IWUSR);
    use IPC::SharedMem;

    $shm = IPC::SharedMem->new(IPC_PRIVATE, 8, S_IRWXU);

    $shm->write(pack("S", 4711), 2, 2);

    $data = $shm->read(0, 2);

    $ds = $shm->stat;

    $shm->remove;

=head1 DESCRIPTION

A class providing an object based interface to SysV IPC shared memory.

=head1 METHODS

=over 4

=item new ( KEY , SIZE , FLAGS )

Creates a new shared memory segment of C<SIZE> bytes size associated
with C<KEY>. A new segment is created if

=over 4

=item *

C<KEY> is equal to C<IPC_PRIVATE>

=item *

C<KEY> does not already have a shared memory segment associated
with it, and C<I<FLAGS> & IPC_CREAT> is true.

=back

On creation of a new shared memory segment C<FLAGS> is used to
set the permissions.  Be careful not to set any flags that the
Sys V IPC implementation does not allow: in some systems setting
execute bits makes the operations fail.

=item id

Returns the shared memory identifier.

=item read ( POS, SIZE )

Read C<SIZE> bytes from the shared memory segment at C<POS>. Returns
the string read, or C<undef> if there was an error. The return value
becomes tainted. See L<shmread>.

=item write ( STRING, POS, SIZE )

Write C<SIZE> bytes to the shared memory segment at C<POS>. Returns
true if successful, or false if there is an error. See L<shmwrite>.

=item remove

Remove the shared memory segment from the system or mark it as
removed as long as any processes are still attached to it.

=item is_removed

Returns true if the shared memory segment has been removed or
marked for removal.

=item stat

Returns an object of type C<IPC::SharedMem::stat> which is a sub-class
of C<Class::Struct>. It provides the following fields. For a description
of these fields see you system documentation.

    uid
    gid
    cuid
    cgid
    mode
    segsz
    lpid
    cpid
    nattch
    atime
    dtime
    ctime

=item attach ( [FLAG] )

Permanently attach to the shared memory segment. When a C<IPC::SharedMem>
object is attached, it will use L<memread> and L<memwrite> instead of
L<shmread> and L<shmwrite> for accessing the shared memory segment.
Returns true if successful, or false on error. See L<shmat(2)>.

=item detach

Detach from the shared memory segment that previously has been attached
to. Returns true if successful, or false on error. See L<shmdt(2)>.

=item addr

Returns the address of the shared memory that has been attached to in a
format suitable for use with C<pack('P')>. Returns C<undef> if the shared
memory has not been attached.

=back

=head1 SEE ALSO

L<IPC::SysV>, L<Class::Struct>

=head1 AUTHORS

Marcus Holland-Moritz <mhx@cpan.org>

=head1 COPYRIGHT

Version 2.x, Copyright (C) 2007-2013, Marcus Holland-Moritz.

Version 1.x, Copyright (c) 1997, Graham Barr.

This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.

=cut

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