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APPENDIXES
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Perl: The Complete Reference
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The constructor only identifies one option, Domain, which specifies the domain in which to create the socket Any other options are supplied to the IO::Socket::INET or IO::Socket::UNIX constructor accordingly The newly created handle will be in autoflush mode This is the default operation from versions above 11603 (Perl 5004_04) You will need to specify this explicitly if you want to remain compatible with earlier versions The class supports the following methods:
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This accepts a new socket connection like the built-in accept function, returning a new IO::Socket handle of the appropriate type If you specify PKG, the new object will be of the specified class, rather than that of the parent handle In a scalar context, only the new object is returned; in a list context, both the object and the peer address are returned The method will return undef or an empty list on failure
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If supplied without any arguments, the current time-out setting is returned If called with an argument, it sets the time-out value The time-out value is used by various other methods
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gets/sets the socket option OPT If the method is only supplied OPT, it gets the current value of the option To set a value, use the two-argument form
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returns the numerical value of the socket domain type
socktype
returns the numerical value of the socket type
protocol
returns the numerical value of the protocol being used on the socket If the protocol is unknown, zero is returned
Appendix B:
Standard Perl Library
peername
This is identical to the built-in getpeername function
sockname
This is identical to the built-in getsockname function The class also supplies frontend methods for the following built-in functions:
socket socketpair bind listen send recv
Please refer to 9 and Appendix A for more information on these functions/methods
IO::Socket::INET
The IO::Socket::INET class provides a constructor to create a socket within the AF_INET family/domain The constructor accepts a hash that takes the options shown in Table B-11 If passed a single argument, the constructor assumes that it s a PeerAddr specification For example, to create a connection to a web server on port 80,
$socket = IO::Socket::INET->new(PeerAddr => 'wwwmcwordscom:http(80)');
Or to create a local socket for listening:
$socket = IO::Socket::INET->new(LocalAddr => 'localhost', LocalPort => '7000', Listen => '5', Proto => 'tcp');
Note that by specifying LocalAddr and Listen, the constructor builds a local socket suitable for acting as a server-side socket You can use the accept method (inherited from IO::Socket), which works just like the built-in function Beyond the methods that are inherited from IO::Socket and IO::Handle, the IO::Socket::INET class also supports the following methods:
sockaddr
APPENDIXES
Perl: The Complete Reference
Option
PeerAddr
Format
hostname[:port]
Description
Remote host address (and port) The address can be specified as a name (which will be resolved) or as an IP address The port (if specified) should be a valid service name and/or port number as defined in PeerPort The service port name and number, or number only Local host address to bind to The local service port name and number, or number only The protocol name or number If this is not specified and you give a service name in the PeerPort option, then the constructor will attempt to derive Proto from the given service name If it cannot be resolved, then "tcp" is used The socket type, specified using a constant as exported by Socket This will be deduced from Proto if not otherwise specified The queue size for listening to requests If true, then it sets the SO_REUSEADDR option before binding to the local socket
PeerPort LocalAddr LocalPort Proto
service(port)|port hostname[:port] service(no)|no "tcp"|"udp"|
Type
SOCK_STREAM| SOCK_DGRAM|
Listen Reuse
Table B-11
Options for Creating an IO::Socket::INET Object
returns the 4-byte packed address of the local socket
sockport
returns the port number used for the local socket
sockhost
Appendix B:
Standard Perl Library
returns the IP address in the form xxxxxxxxxxxx for the local socket
peeraddr
returns the 4-byte packed address of the remote socket
peerport
returns the port number used for the remote socket
peerhost
returns the IP address in the form xxxxxxxxxxxx for the remote socket
IO::Socket::UNIX
The IO::Socket::UNIX class provides a constructor to create a socket within the AF_UNIX family/domain The constructor accepts a hash that takes the options shown in Table B-12 Like the IO::Socket::INET class, this class supports the methods inherited from IO::Socket and IO::Handle, in addition to the following methods:
hostpath
returns the pathname to the FIFO file at the local end
Option
Type Local Peer Listen
Description
The socket type, SOCK_STREAM, SOCK_DGRAM, or one of the other constants supported in Socket Path to the local FIFO file
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