3 # Copyright (c) 1997-8 Graham Barr <gbarr@pobox.com>. All rights reserved.
4 # This program is free software; you can redistribute it and/or
5 # modify it under the same terms as Perl itself.
15 our(@ISA, $VERSION, @EXPORT_OK);
21 require IO::Socket::INET;
22 require IO::Socket::UNIX if ($^O ne 'epoc' && $^O ne 'symbian');
24 @ISA = qw(IO::Handle);
28 @EXPORT_OK = qw(sockatmark);
32 if (@_ && $_[0] eq 'sockatmark') { # not very extensible but for now, fast
33 Exporter::export_to_level('IO::Socket', 1, $pkg, 'sockatmark');
36 Exporter::export 'Socket', $callpkg, @_;
42 my $sock = $class->SUPER::new();
46 ${*$sock}{'io_socket_timeout'} = delete $arg{Timeout};
48 return scalar(%arg) ? $sock->configure(\%arg)
61 my $domain = delete $arg->{Domain};
63 croak 'IO::Socket: Cannot configure a generic socket'
64 unless defined $domain;
66 croak "IO::Socket: Unsupported socket domain"
67 unless defined $domain2pkg[$domain];
69 croak "IO::Socket: Cannot configure socket in domain '$domain'"
70 unless ref($sock) eq "IO::Socket";
72 bless($sock, $domain2pkg[$domain]);
73 $sock->configure($arg);
77 @_ == 4 or croak 'usage: $sock->socket(DOMAIN, TYPE, PROTOCOL)';
78 my($sock,$domain,$type,$protocol) = @_;
80 socket($sock,$domain,$type,$protocol) or
83 ${*$sock}{'io_socket_domain'} = $domain;
84 ${*$sock}{'io_socket_type'} = $type;
85 ${*$sock}{'io_socket_proto'} = $protocol;
91 @_ == 4 || croak 'usage: IO::Socket->socketpair(DOMAIN, TYPE, PROTOCOL)';
92 my($class,$domain,$type,$protocol) = @_;
93 my $sock1 = $class->new();
94 my $sock2 = $class->new();
96 socketpair($sock1,$sock2,$domain,$type,$protocol) or
99 ${*$sock1}{'io_socket_type'} = ${*$sock2}{'io_socket_type'} = $type;
100 ${*$sock1}{'io_socket_proto'} = ${*$sock2}{'io_socket_proto'} = $protocol;
106 @_ == 2 or croak 'usage: $sock->connect(NAME)';
109 my $timeout = ${*$sock}{'io_socket_timeout'};
113 $blocking = $sock->blocking(0) if $timeout;
114 if (!connect($sock, $addr)) {
115 if (defined $timeout && ($!{EINPROGRESS} || $!{EWOULDBLOCK})) {
118 my $sel = new IO::Select $sock;
121 if (!$sel->can_write($timeout)) {
122 $err = $! || (exists &Errno::ETIMEDOUT ? &Errno::ETIMEDOUT : 1);
123 $@ = "connect: timeout";
125 elsif (!connect($sock,$addr) &&
126 not ($!{EISCONN} || ($! == 10022 && $^O eq 'MSWin32'))
128 # Some systems refuse to re-connect() to
129 # an already open socket and set errno to EISCONN.
130 # Windows sets errno to WSAEINVAL (10022)
135 elsif ($blocking || !($!{EINPROGRESS} || $!{EWOULDBLOCK})) {
141 $sock->blocking(1) if $blocking;
145 $err ? undef : $sock;
152 return $sock->SUPER::blocking(@_)
155 # Windows handles blocking differently
157 # http://groups.google.co.uk/group/perl.perl5.porters/browse_thread/
158 # thread/b4e2b1d88280ddff/630b667a66e3509f?#630b667a66e3509f
159 # http://msdn.microsoft.com/library/default.asp?url=/library/en-us/
160 # winsock/winsock/ioctlsocket_2.asp
162 # 0x8004667e is FIONBIO
163 # By default all sockets are blocking
165 return !${*$sock}{io_sock_nonblocking}
170 ${*$sock}{io_sock_nonblocking} = $block ? "0" : "1";
172 return ioctl($sock, 0x8004667e, \${*$sock}{io_sock_nonblocking});
177 @_ == 1 or croak 'usage: $sock->close()';
179 ${*$sock}{'io_socket_peername'} = undef;
180 $sock->SUPER::close();
184 @_ == 2 or croak 'usage: $sock->bind(NAME)';
188 return bind($sock, $addr) ? $sock
193 @_ >= 1 && @_ <= 2 or croak 'usage: $sock->listen([QUEUE])';
194 my($sock,$queue) = @_;
196 unless $queue && $queue > 0;
198 return listen($sock, $queue) ? $sock
203 @_ == 1 || @_ == 2 or croak 'usage $sock->accept([PKG])';
205 my $pkg = shift || $sock;
206 my $timeout = ${*$sock}{'io_socket_timeout'};
207 my $new = $pkg->new(Timeout => $timeout);
210 if(defined $timeout) {
213 my $sel = new IO::Select $sock;
215 unless ($sel->can_read($timeout)) {
216 $@ = 'accept: timeout';
217 $! = (exists &Errno::ETIMEDOUT ? &Errno::ETIMEDOUT : 1);
222 $peer = accept($new,$sock)
225 return wantarray ? ($new, $peer)
230 @_ == 1 or croak 'usage: $sock->sockname()';
235 @_ == 1 or croak 'usage: $sock->peername()';
237 ${*$sock}{'io_socket_peername'} ||= getpeername($sock);
241 @_ == 1 or croak 'usage: $sock->connected()';
247 @_ >= 2 && @_ <= 4 or croak 'usage: $sock->send(BUF, [FLAGS, [TO]])';
249 my $flags = $_[2] || 0;
250 my $peer = $_[3] || $sock->peername;
252 croak 'send: Cannot determine peer address'
255 my $r = defined(getpeername($sock))
256 ? send($sock, $_[1], $flags)
257 : send($sock, $_[1], $flags, $peer);
259 # remember who we send to, if it was successful
260 ${*$sock}{'io_socket_peername'} = $peer
261 if(@_ == 4 && defined $r);
267 @_ == 3 || @_ == 4 or croak 'usage: $sock->recv(BUF, LEN [, FLAGS])';
270 my $flags = $_[3] || 0;
272 # remember who we recv'd from
273 ${*$sock}{'io_socket_peername'} = recv($sock, $_[1]='', $len, $flags);
277 @_ == 2 or croak 'usage: $sock->shutdown(HOW)';
278 my($sock, $how) = @_;
279 ${*$sock}{'io_socket_peername'} = undef;
280 shutdown($sock, $how);
284 @_ == 4 or croak '$sock->setsockopt(LEVEL, OPTNAME, OPTVAL)';
285 setsockopt($_[0],$_[1],$_[2],$_[3]);
288 my $intsize = length(pack("i",0));
291 @_ == 3 or croak '$sock->getsockopt(LEVEL, OPTNAME)';
292 my $r = getsockopt($_[0],$_[1],$_[2]);
295 if(defined $r && length($r) == $intsize);
301 @_ == 1 ? $sock->getsockopt(SOL_SOCKET,@_)
302 : $sock->setsockopt(SOL_SOCKET,@_);
306 @_ == 1 or croak 'usage: $sock->atmark()';
312 @_ == 1 || @_ == 2 or croak 'usage: $sock->timeout([VALUE])';
314 my $r = ${*$sock}{'io_socket_timeout'};
316 ${*$sock}{'io_socket_timeout'} = defined $val ? 0 + $val : $val
323 @_ == 1 or croak 'usage: $sock->sockdomain()';
325 ${*$sock}{'io_socket_domain'};
329 @_ == 1 or croak 'usage: $sock->socktype()';
331 ${*$sock}{'io_socket_type'}
335 @_ == 1 or croak 'usage: $sock->protocol()';
337 ${*$sock}{'io_socket_proto'};
346 IO::Socket - Object interface to socket communications
354 C<IO::Socket> provides an object interface to creating and using sockets. It
355 is built upon the L<IO::Handle> interface and inherits all the methods defined
358 C<IO::Socket> only defines methods for those operations which are common to all
359 types of socket. Operations which are specified to a socket in a particular
360 domain have methods defined in sub classes of C<IO::Socket>
362 C<IO::Socket> will export all functions (and constants) defined by L<Socket>.
370 Creates an C<IO::Socket>, which is a reference to a
371 newly created symbol (see the C<Symbol> package). C<new>
372 optionally takes arguments, these arguments are in key-value pairs.
373 C<new> only looks for one key C<Domain> which tells new which domain
374 the socket will be in. All other arguments will be passed to the
375 configuration method of the package for that domain, See below.
377 NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE
379 As of VERSION 1.18 all IO::Socket objects have autoflush turned on
380 by default. This was not the case with earlier releases.
382 NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE NOTE
388 See L<perlfunc> for complete descriptions of each of the following
389 supported C<IO::Socket> methods, which are just front ends for the
390 corresponding built-in functions:
399 peername (getpeername)
400 sockname (getsockname)
403 Some methods take slightly different arguments to those defined in L<perlfunc>
404 in attempt to make the interface more flexible. These are
410 perform the system call C<accept> on the socket and return a new
411 object. The new object will be created in the same class as the listen
412 socket, unless C<PKG> is specified. This object can be used to
413 communicate with the client that was trying to connect.
415 In a scalar context the new socket is returned, or undef upon
416 failure. In a list context a two-element array is returned containing
417 the new socket and the peer address; the list will be empty upon
420 The timeout in the [PKG] can be specified as zero to effect a "poll",
421 but you shouldn't do that because a new IO::Select object will be
422 created behind the scenes just to do the single poll. This is
423 horrendously inefficient. Use rather true select() with a zero
424 timeout on the handle, or non-blocking IO.
426 =item socketpair(DOMAIN, TYPE, PROTOCOL)
428 Call C<socketpair> and return a list of two sockets created, or an
429 empty list on failure.
433 Additional methods that are provided are:
439 True if the socket is currently positioned at the urgent data mark,
444 my $sock = IO::Socket::INET->new('some_server');
445 $sock->read($data, 1024) until $sock->atmark;
447 Note: this is a reasonably new addition to the family of socket
448 functions, so all systems may not support this yet. If it is
449 unsupported by the system, an attempt to use this method will
452 The atmark() functionality is also exportable as sockatmark() function:
454 use IO::Socket 'sockatmark';
456 This allows for a more traditional use of sockatmark() as a procedural
457 socket function. If your system does not support sockatmark(), the
458 C<use> declaration will fail at compile time.
462 If the socket is in a connected state the peer address is returned.
463 If the socket is not in a connected state then undef will be returned.
467 Returns the numerical number for the protocol being used on the socket, if
468 known. If the protocol is unknown, as with an AF_UNIX socket, zero
473 Returns the numerical number for the socket domain type. For example, for
474 an AF_INET socket the value of &AF_INET will be returned.
476 =item sockopt(OPT [, VAL])
478 Unified method to both set and get options in the SOL_SOCKET level. If called
479 with one argument then getsockopt is called, otherwise setsockopt is called.
483 Returns the numerical number for the socket type. For example, for
484 a SOCK_STREAM socket the value of &SOCK_STREAM will be returned.
488 Set or get the timeout value associated with this socket. If called without
489 any arguments then the current setting is returned. If called with an argument
490 the current setting is changed and the previous value returned.
496 L<Socket>, L<IO::Handle>, L<IO::Socket::INET>, L<IO::Socket::UNIX>
500 Graham Barr. atmark() by Lincoln Stein. Currently maintained by the
501 Perl Porters. Please report all bugs to <perl5-porters@perl.org>.
505 Copyright (c) 1997-8 Graham Barr <gbarr@pobox.com>. All rights reserved.
506 This program is free software; you can redistribute it and/or
507 modify it under the same terms as Perl itself.
509 The atmark() implementation: Copyright 2001, Lincoln Stein <lstein@cshl.org>.
510 This module is distributed under the same terms as Perl itself.
511 Feel free to use, modify and redistribute it as long as you retain
512 the correct attribution.