require 'socket.so'
class Addrinfo
# creates an Addrinfo object from the arguments.
#
# The arguments are interpreted as similar to self.
#
# Addrinfo.tcp("0.0.0.0", 4649).family_addrinfo("www.ruby-lang.org", 80)
# #=> #<Addrinfo: 221.186.184.68:80 TCP (www.ruby-lang.org:80)>
#
# Addrinfo.unix("/tmp/sock").family_addrinfo("/tmp/sock2")
# #=> #<Addrinfo: /tmp/sock2 SOCK_STREAM>
#
def family_addrinfo(*args)
if args.empty?
raise ArgumentError, "no address specified"
elsif Addrinfo === args.first
raise ArgumentError, "too many arguments" if args.length != 1
addrinfo = args.first
if (self.pfamily != addrinfo.pfamily) ||
(self.socktype != addrinfo.socktype)
raise ArgumentError, "Addrinfo type mismatch"
end
addrinfo
elsif self.ip?
raise ArgumentError, "IP address needs host and port but #{args.length} arguments given" if args.length != 2
host, port = args
Addrinfo.getaddrinfo(host, port, self.pfamily, self.socktype, self.protocol)[0]
elsif self.unix?
raise ArgumentError, "UNIX socket needs single path argument but #{args.length} arguments given" if args.length != 1
path, = args
Addrinfo.unix(path)
else
raise ArgumentError, "unexpected family"
end
end
# creates a new Socket connected to the address of +local_addrinfo+.
#
# If _local_addrinfo_ is nil, the address of the socket is not bound.
#
# The _timeout_ specify the seconds for timeout.
# Errno::ETIMEDOUT is raised when timeout occur.
#
# If a block is given the created socket is yielded for each address.
#
def connect_internal(local_addrinfo, timeout=nil) # :yields: socket
sock = Socket.new(self.pfamily, self.socktype, self.protocol)
begin
sock.ipv6only! if self.ipv6?
sock.bind local_addrinfo if local_addrinfo
if timeout
begin
sock.connect_nonblock(self)
rescue IO::WaitWritable
if !IO.select(nil, [sock], nil, timeout)
raise Errno::ETIMEDOUT, 'user specified timeout'
end
begin
sock.connect_nonblock(self) # check connection failure
rescue Errno::EISCONN
end
end
else
sock.connect(self)
end
rescue Exception
sock.close
raise
end
if block_given?
begin
yield sock
ensure
sock.close if !sock.closed?
end
else
sock
end
end
private :connect_internal
# :call-seq:
# addrinfo.connect_from([local_addr_args], [opts]) {|socket| ... }
# addrinfo.connect_from([local_addr_args], [opts])
#
# creates a socket connected to the address of self.
#
# If one or more arguments given as _local_addr_args_,
# it is used as the local address of the socket.
# _local_addr_args_ is given for family_addrinfo to obtain actual address.
#
# If _local_addr_args_ is not given, the local address of the socket is not bound.
#
# The optional last argument _opts_ is options represented by a hash.
# _opts_ may have following options:
#
# [:timeout] specify the timeout in seconds.
#
# If a block is given, it is called with the socket and the value of the block is returned.
# The socket is returned otherwise.
#
# Addrinfo.tcp("www.ruby-lang.org", 80).connect_from("0.0.0.0", 4649) {|s|
# s.print "GET / HTTP/1.0\r\nHost: www.ruby-lang.org\r\n\r\n"
# puts s.read
# }
#
# # Addrinfo object can be taken for the argument.
# Addrinfo.tcp("www.ruby-lang.org", 80).connect_from(Addrinfo.tcp("0.0.0.0", 4649)) {|s|
# s.print "GET / HTTP/1.0\r\nHost: www.ruby-lang.org\r\n\r\n"
# puts s.read
# }
#
def connect_from(*args, &block)
opts = Hash === args.last ? args.pop : {}
local_addr_args = args
connect_internal(family_addrinfo(*local_addr_args), opts[:timeout], &block)
end
# :call-seq:
# addrinfo.connect([opts]) {|socket| ... }
# addrinfo.connect([opts])
#
# creates a socket connected to the address of self.
#
# The optional argument _opts_ is options represented by a hash.
# _opts_ may have following options:
#
# [:timeout] specify the timeout in seconds.
#
# If a block is given, it is called with the socket and the value of the block is returned.
# The socket is returned otherwise.
#
# Addrinfo.tcp("www.ruby-lang.org", 80).connect {|s|
# s.print "GET / HTTP/1.0\r\nHost: www.ruby-lang.org\r\n\r\n"
# puts s.read
# }
#
def connect(opts={}, &block)
connect_internal(nil, opts[:timeout], &block)
end
# :call-seq:
# addrinfo.connect_to([remote_addr_args], [opts]) {|socket| ... }
# addrinfo.connect_to([remote_addr_args], [opts])
#
# creates a socket connected to _remote_addr_args_ and bound to self.
#
# The optional last argument _opts_ is options represented by a hash.
# _opts_ may have following options:
#
# [:timeout] specify the timeout in seconds.
#
# If a block is given, it is called with the socket and the value of the block is returned.
# The socket is returned otherwise.
#
# Addrinfo.tcp("0.0.0.0", 4649).connect_to("www.ruby-lang.org", 80) {|s|
# s.print "GET / HTTP/1.0\r\nHost: www.ruby-lang.org\r\n\r\n"
# puts s.read
# }
#
def connect_to(*args, &block)
opts = Hash === args.last ? args.pop : {}
remote_addr_args = args
remote_addrinfo = family_addrinfo(*remote_addr_args)
remote_addrinfo.send(:connect_internal, self, opts[:timeout], &block)
end
# creates a socket bound to self.
#
# If a block is given, it is called with the socket and the value of the block is returned.
# The socket is returned otherwise.
#
# Addrinfo.udp("0.0.0.0", 9981).bind {|s|
# s.local_address.connect {|s| s.send "hello", 0 }
# p s.recv(10) #=> "hello"
# }
#
def bind
sock = Socket.new(self.pfamily, self.socktype, self.protocol)
begin
sock.ipv6only! if self.ipv6?
sock.setsockopt(:SOCKET, :REUSEADDR, 1)
sock.bind(self)
rescue Exception
sock.close
raise
end
if block_given?
begin
yield sock
ensure
sock.close if !sock.closed?
end
else
sock
end
end
# creates a listening socket bound to self.
def listen(backlog=Socket::SOMAXCONN)
sock = Socket.new(self.pfamily, self.socktype, self.protocol)
begin
sock.ipv6only! if self.ipv6?
sock.setsockopt(:SOCKET, :REUSEADDR, 1)
sock.bind(self)
sock.listen(backlog)
rescue Exception
sock.close
raise
end
if block_given?
begin
yield sock
ensure
sock.close if !sock.closed?
end
else
sock
end
end
# iterates over the list of Addrinfo objects obtained by Addrinfo.getaddrinfo.
#
# Addrinfo.foreach(nil, 80) {|x| p x }
# #=> #<Addrinfo: 127.0.0.1:80 TCP (:80)>
# # #<Addrinfo: 127.0.0.1:80 UDP (:80)>
# # #<Addrinfo: [::1]:80 TCP (:80)>
# # #<Addrinfo: [::1]:80 UDP (:80)>
#
def self.foreach(nodename, service, family=nil, socktype=nil, protocol=nil, flags=nil, &block)
Addrinfo.getaddrinfo(nodename, service, family, socktype, protocol, flags).each(&block)
end
end
class BasicSocket < IO
# Returns an address of the socket suitable for connect in the local machine.
#
# This method returns _self_.local_address, except following condition.
#
# - IPv4 unspecified address (0.0.0.0) is replaced by IPv4 loopback address (127.0.0.1).
# - IPv6 unspecified address (::) is replaced by IPv6 loopback address (::1).
#
# If the local address is not suitable for connect, SocketError is raised.
# IPv4 and IPv6 address which port is 0 is not suitable for connect.
# Unix domain socket which has no path is not suitable for connect.
#
# Addrinfo.tcp("0.0.0.0", 0).listen {|serv|
# p serv.connect_address #=> #<Addrinfo: 127.0.0.1:53660 TCP>
# serv.connect_address.connect {|c|
# s, _ = serv.accept
# p [c, s] #=> [#<Socket:fd 4>, #<Socket:fd 6>]
# }
# }
#
def connect_address
addr = local_address
afamily = addr.afamily
if afamily == Socket::AF_INET
raise SocketError, "unbound IPv4 socket" if addr.ip_port == 0
if addr.ip_address == "0.0.0.0"
addr = Addrinfo.new(["AF_INET", addr.ip_port, nil, "127.0.0.1"], addr.pfamily, addr.socktype, addr.protocol)
end
elsif defined?(Socket::AF_INET6) && afamily == Socket::AF_INET6
raise SocketError, "unbound IPv6 socket" if addr.ip_port == 0
if addr.ip_address == "::"
addr = Addrinfo.new(["AF_INET6", addr.ip_port, nil, "::1"], addr.pfamily, addr.socktype, addr.protocol)
elsif addr.ip_address == "0.0.0.0" # MacOS X 10.4 returns "a.b.c.d" for IPv4-mapped IPv6 address.
addr = Addrinfo.new(["AF_INET6", addr.ip_port, nil, "::1"], addr.pfamily, addr.socktype, addr.protocol)
elsif addr.ip_address == "::ffff:0.0.0.0" # MacOS X 10.6 returns "::ffff:a.b.c.d" for IPv4-mapped IPv6 address.
addr = Addrinfo.new(["AF_INET6", addr.ip_port, nil, "::1"], addr.pfamily, addr.socktype, addr.protocol)
end
elsif defined?(Socket::AF_UNIX) && afamily == Socket::AF_UNIX
raise SocketError, "unbound Unix socket" if addr.unix_path == ""
end
addr
end
end
class Socket < BasicSocket
# enable the socket option IPV6_V6ONLY if IPV6_V6ONLY is available.
def ipv6only!
if defined? Socket::IPV6_V6ONLY
self.setsockopt(:IPV6, :V6ONLY, 1)
end
end
# :call-seq:
# Socket.tcp(host, port, local_host=nil, local_port=nil, [opts]) {|socket| ... }
# Socket.tcp(host, port, local_host=nil, local_port=nil, [opts])
#
# creates a new socket object connected to host:port using TCP/IP.
#
# If local_host:local_port is given,
# the socket is bound to it.
#
# The optional last argument _opts_ is options represented by a hash.
# _opts_ may have following options:
#
# [:connect_timeout] specify the timeout in seconds.
#
# If a block is given, the block is called with the socket.
# The value of the block is returned.
# The socket is closed when this method returns.
#
# If no block is given, the socket is returned.
#
# Socket.tcp("www.ruby-lang.org", 80) {|sock|
# sock.print "GET / HTTP/1.0\r\nHost: www.ruby-lang.org\r\n\r\n"
# sock.close_write
# puts sock.read
# }
#
def self.tcp(host, port, *rest) # :yield: socket
opts = Hash === rest.last ? rest.pop : {}
raise ArgumentError, "wrong number of arguments (#{rest.length} for 2)" if 2 < rest.length
local_host, local_port = rest
last_error = nil
ret = nil
connect_timeout = opts[:connect_timeout]
local_addr_list = nil
if local_host != nil || local_port != nil
local_addr_list = Addrinfo.getaddrinfo(local_host, local_port, nil, :STREAM, nil)
end
Addrinfo.foreach(host, port, nil, :STREAM) {|ai|
if local_addr_list
local_addr = local_addr_list.find {|local_ai| local_ai.afamily == ai.afamily }
next if !local_addr
else
local_addr = nil
end
begin
sock = local_addr ?
ai.connect_from(local_addr, :timeout => connect_timeout) :
ai.connect(:timeout => connect_timeout)
rescue SystemCallError
last_error = $!
next
end
ret = sock
break
}
if !ret
if last_error
raise last_error
else
raise SocketError, "no appropriate local address"
end
end
if block_given?
begin
yield ret
ensure
ret.close if !ret.closed?
end
else
ret
end
end
# :stopdoc:
def self.ip_sockets_port0(ai_list, reuseaddr)
sockets = []
begin
sockets.clear
port = nil
ai_list.each {|ai|
begin
s = Socket.new(ai.pfamily, ai.socktype, ai.protocol)
rescue SystemCallError
next
end
sockets << s
s.ipv6only! if ai.ipv6?
if reuseaddr
s.setsockopt(:SOCKET, :REUSEADDR, 1)
end
if !port
s.bind(ai)
port = s.local_address.ip_port
else
s.bind(ai.family_addrinfo(ai.ip_address, port))
end
}
rescue Errno::EADDRINUSE
sockets.each {|s| s.close }
retry
rescue Exception
sockets.each {|s| s.close }
raise
end
sockets
end
class << self
private :ip_sockets_port0
end
def self.tcp_server_sockets_port0(host)
ai_list = Addrinfo.getaddrinfo(host, 0, nil, :STREAM, nil, Socket::AI_PASSIVE)
sockets = ip_sockets_port0(ai_list, true)
begin
sockets.each {|s|
s.listen(Socket::SOMAXCONN)
}
rescue Exception
sockets.each {|s| s.close }
raise
end
sockets
end
class << self
private :tcp_server_sockets_port0
end
# :startdoc:
# creates TCP/IP server sockets for _host_ and _port_.
# _host_ is optional.
#
# If no block given,
# it returns an array of listening sockets.
#
# If a block is given, the block is called with the sockets.
# The value of the block is returned.
# The socket is closed when this method returns.
#
# If _port_ is 0, actual port number is chosen dynamically.
# However all sockets in the result has same port number.
#
# # tcp_server_sockets returns two sockets.
# sockets = Socket.tcp_server_sockets(1296)
# p sockets #=> [#<Socket:fd 3>, #<Socket:fd 4>]
#
# # The sockets contains IPv6 and IPv4 sockets.
# sockets.each {|s| p s.local_address }
# #=> #<Addrinfo: [::]:1296 TCP>
# # #<Addrinfo: 0.0.0.0:1296 TCP>
#
# # IPv6 and IPv4 socket has same port number, 53114, even if it is chosen dynamically.
# sockets = Socket.tcp_server_sockets(0)
# sockets.each {|s| p s.local_address }
# #=> #<Addrinfo: [::]:53114 TCP>
# # #<Addrinfo: 0.0.0.0:53114 TCP>
#
# # The block is called with the sockets.
# Socket.tcp_server_sockets(0) {|sockets|
# p sockets #=> [#<Socket:fd 3>, #<Socket:fd 4>]
# }
#
def self.tcp_server_sockets(host=nil, port)
if port == 0
sockets = tcp_server_sockets_port0(host)
else
last_error = nil
sockets = []
begin
Addrinfo.foreach(host, port, nil, :STREAM, nil, Socket::AI_PASSIVE) {|ai|
begin
s = ai.listen
rescue SystemCallError
last_error = $!
next
end
sockets << s
}
if sockets.empty?
raise last_error
end
rescue Exception
sockets.each {|s| s.close }
raise
end
end
if block_given?
begin
yield sockets
ensure
sockets.each {|s| s.close if !s.closed? }
end
else
sockets
end
end
# yield socket and client address for each a connection accepted via given sockets.
#
# The arguments are a list of sockets.
# The individual argument should be a socket or an array of sockets.
#
# This method yields the block sequentially.
# It means that the next connection is not accepted until the block returns.
# So concurrent mechanism, thread for example, should be used to service multiple clients at a time.
#
def self.accept_loop(*sockets) # :yield: socket, client_addrinfo
sockets.flatten!(1)
if sockets.empty?
raise ArgumentError, "no sockets"
end
loop {
readable, _, _ = IO.select(sockets)
readable.each {|r|
begin
sock, addr = r.accept_nonblock
rescue IO::WaitReadable
next
end
yield sock, addr
}
}
end
# creates a TCP/IP server on _port_ and calls the block for each connection accepted.
# The block is called with a socket and a client_address as an Addrinfo object.
#
# If _host_ is specified, it is used with _port_ to determine the server addresses.
#
# The socket is *not* closed when the block returns.
# So application should close it explicitly.
#
# This method calls the block sequentially.
# It means that the next connection is not accepted until the block returns.
# So concurrent mechanism, thread for example, should be used to service multiple clients at a time.
#
# Note that Addrinfo.getaddrinfo is used to determine the server socket addresses.
# When Addrinfo.getaddrinfo returns two or more addresses,
# IPv4 and IPv6 address for example,
# all of them are used.
# Socket.tcp_server_loop succeeds if one socket can be used at least.
#
# # Sequential echo server.
# # It services only one client at a time.
# Socket.tcp_server_loop(16807) {|sock, client_addrinfo|
# begin
# IO.copy_stream(sock, sock)
# ensure
# sock.close
# end
# }
#
# # Threaded echo server
# # It services multiple clients at a time.
# # Note that it may accept connections too much.
# Socket.tcp_server_loop(16807) {|sock, client_addrinfo|
# Thread.new {
# begin
# IO.copy_stream(sock, sock)
# ensure
# sock.close
# end
# }
# }
#
def self.tcp_server_loop(host=nil, port, &b) # :yield: socket, client_addrinfo
tcp_server_sockets(host, port) {|sockets|
accept_loop(sockets, &b)
}
end
# :call-seq:
# Socket.udp_server_sockets([host, ] port)
#
# Creates UDP/IP sockets for a UDP server.
#
# If no block given, it returns an array of sockets.
#
# If a block is given, the block is called with the sockets.
# The value of the block is returned.
# The sockets are closed when this method returns.
#
# If _port_ is zero, some port is chosen.
# But the chosen port is used for the all sockets.
#
# # UDP/IP echo server
# Socket.udp_server_sockets(0) {|sockets|
# p sockets.first.local_address.ip_port #=> 32963
# Socket.udp_server_loop_on(sockets) {|msg, msg_src|
# msg_src.reply msg
# }
# }
#
def self.udp_server_sockets(host=nil, port)
last_error = nil
sockets = []
ipv6_recvpktinfo = nil
if defined? Socket::AncillaryData
if defined? Socket::IPV6_RECVPKTINFO # RFC 3542
ipv6_recvpktinfo = Socket::IPV6_RECVPKTINFO
elsif defined? Socket::IPV6_PKTINFO # RFC 2292
ipv6_recvpktinfo = Socket::IPV6_PKTINFO
end
end
local_addrs = Socket.ip_address_list
ip_list = []
Addrinfo.foreach(host, port, nil, :DGRAM, nil, Socket::AI_PASSIVE) {|ai|
if ai.ipv4? && ai.ip_address == "0.0.0.0"
local_addrs.each {|a|
next if !a.ipv4?
ip_list << Addrinfo.new(a.to_sockaddr, :INET, :DGRAM, 0);
}
elsif ai.ipv6? && ai.ip_address == "::" && !ipv6_recvpktinfo
local_addrs.each {|a|
next if !a.ipv6?
ip_list << Addrinfo.new(a.to_sockaddr, :INET6, :DGRAM, 0);
}
else
ip_list << ai
end
}
if port == 0
sockets = ip_sockets_port0(ip_list, false)
else
ip_list.each {|ip|
ai = Addrinfo.udp(ip.ip_address, port)
begin
s = ai.bind
rescue SystemCallError
last_error = $!
next
end
sockets << s
}
if sockets.empty?
raise last_error
end
end
sockets.each {|s|
ai = s.local_address
if ipv6_recvpktinfo && ai.ipv6? && ai.ip_address == "::"
s.setsockopt(:IPV6, ipv6_recvpktinfo, 1)
end
}
if block_given?
begin
yield sockets
ensure
sockets.each {|s| s.close if !s.closed? } if sockets
end
else
sockets
end
end
# :call-seq:
# Socket.udp_server_recv(sockets) {|msg, msg_src| ... }
#
# Receive UDP/IP packets from the given _sockets_.
# For each packet received, the block is called.
#
# The block receives _msg_ and _msg_src_.
# _msg_ is a string which is the payload of the received packet.
# _msg_src_ is a Socket::UDPSource object which is used for reply.
#
# Socket.udp_server_loop can be implemented using this method as follows.
#
# udp_server_sockets(host, port) {|sockets|
# loop {
# readable, _, _ = IO.select(sockets)
# udp_server_recv(readable) {|msg, msg_src| ... }
# }
# }
#
def self.udp_server_recv(sockets)
sockets.each {|r|
begin
msg, sender_addrinfo, _, *controls = r.recvmsg_nonblock
rescue IO::WaitReadable
next
end
ai = r.local_address
if ai.ipv6? and pktinfo = controls.find {|c| c.cmsg_is?(:IPV6, :PKTINFO) }
ai = Addrinfo.udp(pktinfo.ipv6_pktinfo_addr.ip_address, ai.ip_port)
yield msg, UDPSource.new(sender_addrinfo, ai) {|reply_msg|
r.sendmsg reply_msg, 0, sender_addrinfo, pktinfo
}
else
yield msg, UDPSource.new(sender_addrinfo, ai) {|reply_msg|
r.send reply_msg, 0, sender_addrinfo
}
end
}
end
# :call-seq:
# Socket.udp_server_loop_on(sockets) {|msg, msg_src| ... }
#
# Run UDP/IP server loop on the given sockets.
#
# The return value of Socket.udp_server_sockets is appropriate for the argument.
#
# It calls the block for each message received.
#
def self.udp_server_loop_on(sockets, &b) # :yield: msg, msg_src
loop {
readable, _, _ = IO.select(sockets)
udp_server_recv(readable, &b)
}
end
# :call-seq:
# Socket.udp_server_loop(port) {|msg, msg_src| ... }
# Socket.udp_server_loop(host, port) {|msg, msg_src| ... }
#
# creates a UDP/IP server on _port_ and calls the block for each message arrived.
# The block is called with the message and its source information.
#
# This method allocates sockets internally using _port_.
# If _host_ is specified, it is used conjunction with _port_ to determine the server addresses.
#
# The _msg_ is a string.
#
# The _msg_src_ is a Socket::UDPSource object.
# It is used for reply.
#
# # UDP/IP echo server.
# Socket.udp_server_loop(9261) {|msg, msg_src|
# msg_src.reply msg
# }
#
def self.udp_server_loop(host=nil, port, &b) # :yield: message, message_source
udp_server_sockets(host, port) {|sockets|
udp_server_loop_on(sockets, &b)
}
end
# UDP/IP address information used by Socket.udp_server_loop.
class UDPSource
# +remote_address+ is an Addrinfo object.
#
# +local_address+ is an Addrinfo object.
#
# +reply_proc+ is a Proc used to send reply back to the source.
def initialize(remote_address, local_address, &reply_proc)
@remote_address = remote_address
@local_address = local_address
@reply_proc = reply_proc
end
# Address of the source
attr_reader :remote_address
# Local address
attr_reader :local_address
def inspect # :nodoc:
"\#<#{self.class}: #{@remote_address.inspect_sockaddr} to #{@local_address.inspect_sockaddr}>"
end
# Sends the String +msg+ to the source
def reply(msg)
@reply_proc.call msg
end
end
# creates a new socket connected to path using UNIX socket socket.
#
# If a block is given, the block is called with the socket.
# The value of the block is returned.
# The socket is closed when this method returns.
#
# If no block is given, the socket is returned.
#
# # talk to /tmp/sock socket.
# Socket.unix("/tmp/sock") {|sock|
# t = Thread.new { IO.copy_stream(sock, STDOUT) }
# IO.copy_stream(STDIN, sock)
# t.join
# }
#
def self.unix(path) # :yield: socket
addr = Addrinfo.unix(path)
sock = addr.connect
if block_given?
begin
yield sock
ensure
sock.close if !sock.closed?
end
else
sock
end
end
# creates a UNIX server socket on _path_
#
# If no block given, it returns a listening socket.
#
# If a block is given, it is called with the socket and the block value is returned.
# When the block exits, the socket is closed and the socket file is removed.
#
# socket = Socket.unix_server_socket("/tmp/s")
# p socket #=> #<Socket:fd 3>
# p socket.local_address #=> #<Addrinfo: /tmp/s SOCK_STREAM>
#
# Socket.unix_server_socket("/tmp/sock") {|s|
# p s #=> #<Socket:fd 3>
# p s.local_address #=> # #<Addrinfo: /tmp/sock SOCK_STREAM>
# }
#
def self.unix_server_socket(path)
if !unix_socket_abstract_name?(path)
begin
st = File.lstat(path)
rescue Errno::ENOENT
end
if st && st.socket? && st.owned?
File.unlink path
end
end
s = Addrinfo.unix(path).listen
if block_given?
begin
yield s
ensure
s.close if !s.closed?
if !unix_socket_abstract_name?(path)
File.unlink path
end
end
else
s
end
end
class << self
private
def unix_socket_abstract_name?(path)
/linux/ =~ RUBY_PLATFORM && /\A(\0|\z)/ =~ path
end
end
# creates a UNIX socket server on _path_.
# It calls the block for each socket accepted.
#
# If _host_ is specified, it is used with _port_ to determine the server ports.
#
# The socket is *not* closed when the block returns.
# So application should close it.
#
# This method deletes the socket file pointed by _path_ at first if
# the file is a socket file and it is owned by the user of the application.
# This is safe only if the directory of _path_ is not changed by a malicious user.
# So don't use /tmp/malicious-users-directory/socket.
# Note that /tmp/socket and /tmp/your-private-directory/socket is safe assuming that /tmp has sticky bit.
#
# # Sequential echo server.
# # It services only one client at a time.
# Socket.unix_server_loop("/tmp/sock") {|sock, client_addrinfo|
# begin
# IO.copy_stream(sock, sock)
# ensure
# sock.close
# end
# }
#
def self.unix_server_loop(path, &b) # :yield: socket, client_addrinfo
unix_server_socket(path) {|serv|
accept_loop(serv, &b)
}
end
end