class Socket
Included Modules
Direct Known Subclasses
Defined in:
socket.crsocket/address.cr
socket/addrinfo.cr
socket/server.cr
Constructors
- .new(fd : Int32, family, type, protocol = Protocol::IP, blocking = false)
- .new(family, type, protocol = Protocol::IP, blocking = false)
Class Method Summary
- .fcntl(fd, cmd, arg = 0)
-
.ip?(string : String)
Returns
true
if the string represents a valid IPv4 or IPv6 address. -
.tcp(family : Family, blocking = false)
Creates a TCP socket.
-
.udp(family : Family, blocking = false)
Creates an UDP socket.
-
.unix(type : Type = Type::STREAM, blocking = false)
Creates an UNIX socket.
Instance Method Summary
-
#accept
Accepts an incoming connection.
-
#accept?
Accepts an incoming connection.
-
#bind(addr, &block)
Tries to bind the socket to a local address.
-
#bind(host : String, port : Int)
Binds the socket to a local address.
-
#bind(port : Int)
Binds the socket on port to all local interfaces.
-
#bind(addr)
Binds the socket to a local address.
- #blocking
- #blocking=(value)
- #broadcast=(val : Bool)
- #broadcast?
- #close_on_exec=(arg : Bool)
- #close_on_exec?
-
#close_read
Calls
shutdown(2)
withSHUT_RD
-
#close_write
Calls
shutdown(2)
withSHUT_WR
- #closed? : Bool
-
#connect(addr, timeout = nil, &block)
Tries to connect to a remote address.
-
#connect(addr, timeout = nil) : Nil
Connects the socket to a remote address.
-
#connect(host : String, port : Int, connect_timeout = nil)
Connects the socket to a remote host:port.
- #family : Family
- #fcntl(cmd, arg = 0)
- #fd : Int32
- #finalize
-
#getsockopt(optname, optval, level = LibC::SOL_SOCKET)
Returns the modified optval.
- #inspect(io)
- #keepalive=(val : Bool)
- #keepalive?
- #linger
-
#linger=(val : Int?)
WARNING: The behavior of
SO_LINGER
is platform specific. -
#listen(backlog = SOMAXCONN)
Tells the previously bound socket to listen for incoming connections.
-
#listen(backlog = SOMAXCONN, &block)
Tries to listen for connections on the previously bound socket.
- #protocol : Protocol
-
#receive(max_message_size = 512) : Tuple(String, Address)
Receives a text message from the previously bound address.
-
#receive(message : Bytes) : Tuple(Int32, Address)
Receives a binary message from the previously bound address.
- #recv_buffer_size
- #recv_buffer_size=(val : Int32)
- #reuse_address=(val : Bool)
- #reuse_address?
- #reuse_port=(val : Bool)
- #reuse_port?
-
#send(message, to addr : Address)
Sends a message to the specified remote address.
-
#send(message)
Sends a message to a previously connected remote address.
- #send_buffer_size
- #send_buffer_size=(val : Int32)
-
#setsockopt(optname, optval, level = LibC::SOL_SOCKET)
NOTE optval is restricted to
Int32
until sizeof works on variables. - #tty?
- #type : Type
Instance methods inherited from module IO::Syscall
read_syscall_helper(slice : Bytes, errno_msg : String, &block) : Int32
read_syscall_helper,
read_timeout : Time::Span?
read_timeout,
read_timeout=(read_timeout : Number) : Numberread_timeout=(timeout : Time::Span?) : Time::Span? read_timeout=, write_syscall_helper(slice : Bytes, errno_msg : String, &block) : Nil write_syscall_helper, write_timeout : Time::Span? write_timeout, write_timeout=(write_timeout : Number) : Number
write_timeout=(timeout : Time::Span?) : Time::Span? write_timeout=
Instance methods inherited from module IO::Buffered
close : Nil
close,
flush
flush,
flush_on_newline=(flush_on_newline)
flush_on_newline=,
flush_on_newline?
flush_on_newline?,
peek : Bytes?
peek,
read(slice : Bytes)
read,
rewind
rewind,
sync=(sync)
sync=,
sync?
sync?,
unbuffered_close
unbuffered_close,
unbuffered_flush
unbuffered_flush,
unbuffered_read(slice : Bytes)
unbuffered_read,
unbuffered_rewind
unbuffered_rewind,
unbuffered_write(slice : Bytes)
unbuffered_write,
write(slice : Bytes)
write
Instance methods inherited from class IO
<<(obj) : self
<<,
close
close,
closed?
closed?,
each_byte(&block) : Nileach_byte each_byte, each_char(&block) : Nil
each_char each_char, each_line(*args, **options, &block) : Nil
each_line(*args, **options) each_line, encoding : String encoding, flush flush, gets(delimiter : Char, limit : Int, chomp = false) : String?
gets(delimiter : Char, chomp = false) : String?
gets(chomp = true) : String?
gets(limit : Int, chomp = false) : String?
gets(delimiter : String, chomp = false) : String? gets, gets_to_end : String gets_to_end, peek : Bytes? peek, pos pos, pos=(value) pos=, print(*objects : _) : Nil
print(obj) : Nil print, printf(format_string, *args) : Nil
printf(format_string, args : Array | Tuple) : Nil printf, puts(*objects : _) : Nil
puts : Nil
puts(obj) : Nil
puts(string : String) : Nil puts, read(slice : Bytes) read, read_at(offset, bytesize, &block) read_at, read_byte : UInt8? read_byte, read_bytes(type, format : IO::ByteFormat = IO::ByteFormat::SystemEndian) read_bytes, read_char : Char? read_char, read_fully(slice : Bytes) read_fully, read_fully?(slice : Bytes) read_fully?, read_line(*args, **options) : String read_line, read_string(bytesize : Int) : String read_string, read_utf8(slice : Bytes) read_utf8, read_utf8_byte read_utf8_byte, rewind rewind, seek(offset, whence : Seek = Seek::Set) seek, set_encoding(encoding : String, invalid : Symbol? = nil) set_encoding, skip(bytes_count : Int) : Nil skip, skip_to_end : Nil skip_to_end, tell tell, tty? : Bool tty?, write(slice : Bytes) : Nil write, write_byte(byte : UInt8) write_byte, write_bytes(object, format : IO::ByteFormat = IO::ByteFormat::SystemEndian) write_bytes, write_utf8(slice : Bytes) write_utf8
Class methods inherited from class IO
copy(src, dst, limit : Int)copy(src, dst) copy, pipe(read_blocking = false, write_blocking = false) : Tuple(IO::FileDescriptor, IO::FileDescriptor)
pipe(read_blocking = false, write_blocking = false, &block) pipe
Instance methods inherited from class Reference
==(other : self)==(other : JSON::Any)
==(other : YAML::Any)
==(other) ==, dup dup, hash(hasher) hash, inspect(io : IO) : Nil inspect, object_id : UInt64 object_id, pretty_print(pp) : Nil pretty_print, same?(other : Reference)
same?(other : Nil) same?, to_s(io : IO) : Nil to_s
Constructor methods inherited from class Reference
new
new
Instance methods inherited from class Object
!=(other)
!=,
!~(other)
!~,
==(other)
==,
===(other : JSON::Any)===(other : YAML::Any)
===(other) ===, =~(other) =~, class class, dup dup, hash(hasher)
hash hash, inspect(io : IO)
inspect inspect, itself itself, not_nil! not_nil!, pretty_inspect(width = 79, newline = "\n", indent = 0) : String pretty_inspect, pretty_print(pp : PrettyPrint) : Nil pretty_print, tap(&block) tap, to_json(io : IO)
to_json to_json, to_pretty_json(indent : String = " ")
to_pretty_json(io : IO, indent : String = " ") to_pretty_json, to_s
to_s(io : IO) to_s, to_yaml(io : IO)
to_yaml to_yaml, try(&block) try, unsafe_as(type : T.class) forall T unsafe_as
Constructor methods inherited from class Object
from_json(string_or_io, root : String) : selffrom_json(string_or_io) : self from_json, from_yaml(string_or_io : String | IO) : self from_yaml
Constructor Detail
Class Method Detail
Returns true
if the string represents a valid IPv4 or IPv6 address.
Creates a TCP socket. Consider using TCPSocket
or TCPServer
unless you
need full control over the socket.
Creates an UDP socket. Consider using UDPSocket
unless you need full
control over the socket.
Creates an UNIX socket. Consider using UNIXSocket
or UNIXServer
unless
you need full control over the socket.
Instance Method Detail
Accepts an incoming connection.
Returns the client socket. Raises an IO::Error
(closed stream) exception
if the server is closed after invoking this method.
require "socket"
server = TCPServer.new(2202)
socket = server.accept
socket.puts Time.now
socket.close
Accepts an incoming connection.
Returns the client Socket
or nil
if the server is closed after invoking
this method.
require "socket"
server = TCPServer.new(2202)
if socket = server.accept?
socket.puts Time.now
socket.close
end
Tries to bind the socket to a local address.
Yields an Errno
if the binding failed.
Binds the socket to a local address.
sock = Socket.tcp(Socket::Family::INET)
sock.bind "localhost", 1234
Binds the socket on port to all local interfaces.
sock = Socket.tcp(Socket::Family::INET6)
sock.bind 1234
Binds the socket to a local address.
sock = Socket.udp(Socket::Family::INET)
sock.bind Socket::IPAddress.new("192.168.1.25", 80)
Tries to connect to a remote address. Yields an IO::Timeout
or an
Errno
error if the connection failed.
Connects the socket to a remote address. Raises if the connection failed.
sock = Socket.unix
sock.connect Socket::UNIXAddress.new("/tmp/service.sock")
Connects the socket to a remote host:port.
sock = Socket.tcp(Socket::Family::INET)
sock.connect "crystal-lang.org", 80
Returns the modified optval.
WARNING: The behavior of SO_LINGER
is platform specific.
Bad things may happen especially with nonblocking sockets.
See Cross-Platform Testing of SO_LINGER by Nybek
for more information.
Tells the previously bound socket to listen for incoming connections.
Tries to listen for connections on the previously bound socket.
Yields an Errno
on failure.
Receives a text message from the previously bound address.
server = Socket.udp(Socket::Family::INET)
server.bind("localhost", 1234)
message, client_addr = server.receive
Receives a binary message from the previously bound address.
server = Socket.udp(Socket::Family::INET)
server.bind("localhost", 1234)
message = Bytes.new(32)
bytes_read, client_addr = server.receive(message)
Sends a message to the specified remote address.
server = Socket::IPAddress.new("10.0.3.1", 2022)
sock = Socket.udp(Socket::Family::INET)
sock.connect("example.com", 2000)
sock.send("text query", to: server)
Sends a message to a previously connected remote address.
sock = Socket.udp(Socket::Family::INET)
sock.connect("example.com", 2000)
sock.send("text message")
sock = Socket.unix(Socket::Type::DGRAM)
sock.connect Socket::UNIXAddress.new("/tmp/service.sock")
sock.send(Bytes[0])
NOTE optval is restricted to Int32
until sizeof works on variables.