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ͨͷ͍͠4PDLFUͷ͘͠Έ ԘҪඒ࡙ !TIJPJNN!DPF@!DPF 5PLZP8PNFOSCট଴ߨԋ Socket Under a Microscope

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QQTFMG ɹԘҪඒ࡙ ͓͍͠ ɹ஍Ҭ3VCZίϛϡχςΟ"TBLVTBSC ɹ3VCZίϛολʔ ɹલ਎Πϕϯτ5PLZP(JSMTSC.FFUVQWPMʹొஃͯ͠·ͨ͠ !TIJPJNN (JU)VC !DPF@ FY5XJUUFS !DPF #MVFTLZ 3BDLϛυϧ΢ΣΞೖ໳ͷͨΊͷ3BDLϛυϧ΢ΣΞ IUUQTTQFBLFSEFDLDPNDPF@SBDLNJEPSVVFBSVNFOGBMTFUBNFGBMTFSBDLNJEPSVVFB

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5PLZP8PNFOSCλΠϜςʔϒϧ IUUQTUPLZPXPNFOSCDPOOQBTTDPNFWFOU

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5PLZP8PNFOSCλΠϜςʔϒϧ ਪ͠ϝιουsource_locationͷ͘͠ΈΛ୳Δ - ͸͡ΊͯRubyͷίʔυΛಡΜͰΈͨ ਪ͠ϝιουTPVSDF@MPDBUJPOͷ͘͠ΈΛ୳Δ ͸͡Ίͯ3VCZͷίʔυΛಡΜͰΈͨ ͨͷ͍͠4PDLFUͷ͘͠Έ 4PDLFUT6OEFSB.JDSPTDPQF 3BJMTͷίʔυͰֶͿ ͱͷ࢓૊Έ ͘͠Έ͕ؾʹͳΔਓʑ find_by_* method_missing nobu09 OPCV ͓͍͠ NBJNV IUUQTUPLZPXPNFOSCDPOOQBTTDPNFWFOU

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5PLZP8PNFOSCςʔϚ ʮ3VCZ͓ͬͯ΋͠Ζ͍ʂʯ ͱ͍͏͜ͱͰɺࣗ෼ʹͱͬͯͷ ʮ3VCZ͓ͬͯ΋͠Ζ͍ʂʯͷ͏ͪͻͱͭʹ͍ͭͯ ͓࿩͍ͨ͠͠ͱࢥ͍·͢

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5PLZP8PNFOSCςʔϚ ʮ3VCZ͓ͬͯ΋͠Ζ͍ʂʯ ͱ͍͏͜ͱͰɺࣗ෼ʹͱͬͯͷ ʮ3VCZ͓ͬͯ΋͠Ζ͍ʂʯͷ͏ͪͻͱͭʹ͍ͭͯ ͓࿩͍ͨ͠͠ͱࢥ͍·͢ ➡︎ 4PDLFU

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ඵͰΘ͔Δ4PDLFU ྫ͑͹ʜ ΫϥΠΞϯτ͕αʔό΁ϦΫΤετΛૹΔ ➡︎ αʔό͕ϦΫΤετΛड͚औΓ8FCΞϓϦέʔγϣϯΛ࣮ߦ ➡︎ αʔό͕ͦͷ࣮ߦ݁ՌΛϨεϙϯεͱͯ͠ΫϥΠΞϯτʹૹΔ ϦΫΤετ Ϩεϙϯε 8FCΞϓϦέʔγϣϯ ΫϥΠΞϯτϗετ αʔόϗετ

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ඵͰΘ͔Δ4PDLFU ιέοτʜϗετʹͱͬͯͷ௨৴ͷग़ೖΓޱ Ϩεϙϯε ΫϥΠΞϯτϗετ αʔόϗετ ιέοτ ϗετ͸௨৴Λߦ͏ࡍʹιέοτΛ࡞੒͠ɺ͜ΕΛհͯ͠ ωοτϫʔΫͷ޲͜͏ଆʹσʔλΛૹ৴ͨ͠Γ ωοτϫʔΫͷ޲͜͏ଆ͔ΒσʔλΛड৴ͨ͠Γ͢Δ ϦΫΤετ 8FCΞϓϦέʔγϣϯ

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ඵͰΘ͔Δ4PDLFU ιέοτʜϗετʹͱͬͯͷ௨৴ͷग़ೖΓޱ ϦΫΤετ Ϩεϙϯε ιέοτ 8FCΞϓϦέʔγϣϯ ΫϥΠΞϯτϗετ αʔόϗετ ιέοτ"1*ʜιέοτΛૢ࡞͢ΔͨΊͷ"1* TPDLFUϥΠϒϥϦʜ3VCZ͔Βιέοτ"1*Λѻ͏ͨΊͷϥΠϒϥϦ

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3VCZͷTPDLFUϥΠϒϥϦΛ࢖͏ͱɺ ؆୯ʹΫϥΠΞϯτɾαʔόϓϩάϥϜ Λͭ͘Δ͜ͱ͕Ͱ͖·͢

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αʔόϓϩάϥϜ αʔό

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αʔόϓϩάϥϜ require "socket" Socket.tcp_server_loop("localhost", 4567) do |sock| message = sock.readpartial 100 sock.write message ensure sock.close end αʔό 4PDLFUUDQ@TFSWFS@MPPQϝιου TPDLFUϥΠϒϥϦΛSFRVJSF

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αʔόϓϩάϥϜ require "socket" Socket.tcp_server_loop("localhost", 4567) do |sock| message = sock.readpartial 100 sock.write message ensure sock.close end αʔό ࣗ਎ͷϗετ໊MPDBMIPTU αʔόࣗ਎ͷϙʔτ൪߸

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αʔόϓϩάϥϜ require "socket" Socket.tcp_server_loop("localhost", 4567) do |sock| message = sock.readpartial 100 sock.write message ensure sock.close end αʔό αʔόͱͯ͠ߦ͏ॲཧ

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αʔόϓϩάϥϜ require "socket" Socket.tcp_server_loop("localhost", 4567) do |sock| message = sock.readpartial 100 sock.write message ensure sock.close end αʔό 4PDLFUΦϒδΣΫτ 4PDLFUΦϒδΣΫτ ιέοτΛ3VCZͷΦϒδΣΫτͰϥοϓ͠ɺ ɹ3VCZ͔Βѻ͑ΔΑ͏ʹͨ͠΋ͷ

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αʔόϓϩάϥϜ require "socket" Socket.tcp_server_loop("localhost", 4567) do |sock| message = sock.readpartial 100 sock.write message ensure sock.close end αʔό 4PDLFUΦϒδΣΫτ ͜͜ͰϒϩοΫม਺ʹ౉ͬͯ͘Δͷ͸ɺ ϦΫΤετΛૹ৴ͨ͠ΫϥΠΞϯτͱ ઀ଓࡁΈͷঢ়ଶͷ4PDLFUΦϒδΣΫτ

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αʔόϓϩάϥϜ require "socket" Socket.tcp_server_loop("localhost", 4567) do |sock| message = sock.readpartial 100 sock.write message ensure sock.close end αʔό 4PDLFUΦϒδΣΫτΛಡΈࠐΈ ΫϥΠΞϯτ͔ΒͷϦΫΤετϝοηʔδΛऔಘ ϦΫΤετΛૹ৴ͨ͠ΫϥΠΞϯτͱ ઀ଓࡁΈͷঢ়ଶͷ4PDLFUΦϒδΣΫτ

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αʔόϓϩάϥϜ require "socket" Socket.tcp_server_loop("localhost", 4567) do |sock| message = sock.readpartial 100 sock.write message ensure sock.close end αʔό 4PDLFUΦϒδΣΫτʹॻ͖ࠐΈ ΫϥΠΞϯτ΁ϨεϙϯεΛૹ৴ ͜͜Ͱ͸ϦΫΤετϝοηʔδΛ ͓͏Ήฦ͠ʹΫϥΠΞϯτʹૹ৴͍ͯ͠Δ ϦΫΤετΛૹ৴ͨ͠ΫϥΠΞϯτͱ ઀ଓࡁΈͷঢ়ଶͷ4PDLFUΦϒδΣΫτ

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αʔόϓϩάϥϜ require "socket" Socket.tcp_server_loop("localhost", 4567) do |sock| message = sock.readpartial 100 sock.write message ensure sock.close end αʔό Ұ௨ΓΫϥΠΞϯτʹର͢Δૢ࡞͕ऴΘͬͨΒ ઀ଓࡁΈ4PDLFUΦϒδΣΫτͷೖग़ྗΛΫϩʔζ ϦΫΤετΛૹ৴ͨ͠ΫϥΠΞϯτͱ ઀ଓࡁΈͷঢ়ଶͷ4PDLFUΦϒδΣΫτ

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αʔόϓϩάϥϜ require "socket" Socket.tcp_server_loop("localhost", 4567) do |sock| message = sock.readpartial 100 sock.write message ensure sock.close end αʔό ϦΫΤετΛड͚ͯϨεϙϯεΛฦ͢ɺͱ͍͏Ұ࿈ͷྲྀΕΛϧʔϓ

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αʔόϓϩάϥϜ require "socket" Socket.tcp_server_loop("localhost", 4567) do |sock| message = sock.readpartial 100 sock.write message ensure sock.close end αʔό ΫϥΠΞϯτ͔ΒϦΫΤετΛड৴͠ɺ ͦΕΛͦͷ··ΫϥΠΞϯτʹϨεϙϯεͱͯ͠ ૹ৴͢Δ؆୯ͳ5$1ΤίʔαʔόϓϩάϥϜ a׬੒

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ΫϥΠΞϯτϓϩάϥϜ ΫϥΠΞϯτ

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ΫϥΠΞϯτϓϩάϥϜ require "socket" Socket.tcp("localhost", 4567) do |sock| sock.write "Hi" message = sock.read puts message end ΫϥΠΞϯτ TPDLFUϥΠϒϥϦΛSFRVJSF 4PDLFUUDQϝιου

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ΫϥΠΞϯτϓϩάϥϜ require "socket" Socket.tcp("localhost", 4567) do |sock| sock.write "Hi" message = sock.read puts message end ΫϥΠΞϯτ Ѽઌϗετ໊MPDBMIPTU Ѽઌϙʔτ൪߸

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ΫϥΠΞϯτϓϩάϥϜ require "socket" Socket.tcp("localhost", 4567) do |sock| sock.write "Hi" message = sock.read puts message end ΫϥΠΞϯτ ΫϥΠΞϯτͱͯ͠ߦ͏ॲཧ

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ΫϥΠΞϯτϓϩάϥϜ require "socket" Socket.tcp("localhost", 4567) do |sock| sock.write "Hi" message = sock.read puts message end ΫϥΠΞϯτ Ѽઌͷαʔόͱ઀ଓࡁΈͷঢ়ଶͷ 4PDLFUΦϒδΣΫτ

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ΫϥΠΞϯτϓϩάϥϜ require "socket" Socket.tcp("localhost", 4567) do |sock| sock.write "Hi" message = sock.read puts message end ΫϥΠΞϯτ 4PDLFUΦϒδΣΫτʹॻ͖ࠐΈ αʔό΁ϦΫΤετϝοηʔδΛૹ৴ Ѽઌͷαʔόͱ઀ଓࡁΈͷঢ়ଶͷ 4PDLFUΦϒδΣΫτ

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ΫϥΠΞϯτϓϩάϥϜ require "socket" Socket.tcp("localhost", 4567) do |sock| sock.write "Hi" message = sock.read puts message end ΫϥΠΞϯτ 4PDLFUΦϒδΣΫτΛಡΈࠐΈ αʔό͔ΒϨεϙϯεϝοηʔδΛऔಘ ϨεϙϯεϝοηʔδΛඪ४ग़ྗ Ѽઌͷαʔόͱ઀ଓࡁΈͷঢ়ଶͷ 4PDLFUΦϒδΣΫτ

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ΫϥΠΞϯτϓϩάϥϜ require "socket" Socket.tcp("localhost", 4567) do |sock| sock.write "Hi" message = sock.read puts message end ΫϥΠΞϯτ ॲཧ͕ऴΘΔͱ4PDLFUΦϒδΣΫτ͸ࣗಈతʹΫϩʔζ Ѽઌͷαʔόͱ઀ଓࡁΈͷঢ়ଶͷ 4PDLFUΦϒδΣΫτ

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ΫϥΠΞϯτϓϩάϥϜ require "socket" Socket.tcp("localhost", 4567) do |sock| sock.write "Hi" message = sock.read puts message end ΫϥΠΞϯτ αʔόʹϦΫΤετ )J Λૹ৴͠ɺ αʔό͔Βड৴ͨ͠ϨεϙϯεΛͦͷ··ग़ྗ͢Δ ؆୯ͳ5$1ΫϥΠΞϯτϓϩάϥϜ a׬੒

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σϞ

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4PDLFUUDQ@TFSWFS@MPPQ4PDLFUUDQͷߏ଄ Socket.tcp_server_loop("localhost", 4567) do |sock| message = sock.readpartial 100 sock.write message ensure sock.close end Socket.tcp("localhost", 4567) do |sock| sock.write "Hi" message = sock.read puts message end αʔό ΫϥΠΞϯτ ΫϥΠΞϯτͱͷ઀ଓޙʹߦ͏࢓ࣄ αʔόͱͷ઀ଓޙʹߦ͏࢓ࣄ αʔόʵΫϥΠΞϯτؒͷ઀ଓཱ͕֬ͨ͠ޙʹߦ͏ॲཧΛ ֤ϝιουͷϒϩοΫ಺ʹهड़͍ͯ͠Δ

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Socket.tcp_server_loop("localhost", 4567) do |sock| message = sock.readpartial 100 sock.write message ensure sock.close end Socket.tcp("localhost", 4567) do |sock| sock.write "Hi" message = sock.read puts message end αʔό ΫϥΠΞϯτ ωοτϫʔΫΛհ͓ͯ͠ޓ͍ʹ઀ଓཱ͕֬͢Δ·Ͱͷॲཧ͸ ͦΕͧΕͷϝιουࣗ਎͕ߦͳ͍ͬͯΔ 4PDLFUUDQ@TFSWFS@MPPQ4PDLFUUDQͷߏ଄ ΫϥΠΞϯτͱͷ઀ଓ αʔόͱͷ઀ଓ

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Socket.tcp_server_loop("localhost", 4567) do |sock| message = sock.readpartial 100 sock.write message ensure sock.close end Socket.tcp("localhost", 4567) do |sock| sock.write "Hi" message = sock.read puts message end αʔό ΫϥΠΞϯτ ͦͷཪଆͰ3VCZ͸ͲͷΑ͏ʹιέοτΛѻ͍ɺ઀ଓ͍ͯ͠Δ 4PDLFUUDQ@TFSWFS@MPPQ4PDLFUUDQͷߏ଄ Ͳ͏΍ͬͯΫϥΠΞϯτͱ઀ଓ͍ͯ͠Δ Ͳ͏΍ͬͯαʔόͱ઀ଓ͍ͯ͠Δ

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ɾ3VCZ .3* ɹIUUQTHJUIVCDPNSVCZSVCZUSFFSVCZ@@ ɾಈ࡞؀ڥ͸NBD04Λ૝ఆ ͨͷ͍͠4PDLFUͷ͘͠Έ Socket Under a Microscope

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4PDLFUUDQ ΫϥΠΞϯτ ฤ Socket.tcp("localhost", 4567) do |sock| sock.write "Hi" message = sock.read puts message end

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4PDLFUUDQ class Socket # ... def self.tcp(host, port, ... fast_fallback: tcp_fast_fallback, &) # ... end # ... end 4PDLFUUDQ͸4PDLFUΫϥεʹ Ϋϥεϝιουͱ࣮ͯ͠૷͞Ε͍ͯΔ FYUTPDLFUMJCTPDLFUSC

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4PDLFUUDQ class Socket # ... def self.tcp(host, port, ... fast_fallback: tcp_fast_fallback, &) sock = if fast_fallback && !(host && ip_address?(host)) tcp_with_fast_fallback(host, port, ...) else tcp_without_fast_fallback(host, port, ...) end # ... end # ... end FYUTPDLFUMJCTPDLFUSC

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4PDLFUUDQ class Socket # ... def self.tcp(host, port, ... fast_fallback: tcp_fast_fallback, &) sock = if fast_fallback && !(host && ip_address?(host)) tcp_with_fast_fallback(host, port, ...) else tcp_without_fast_fallback(host, port, ...) end # ... end # ... end FYUTPDLFUMJCTPDLFUSC ಛఆͷ৚݅Ͱ෼ذ ίʔυϦʔσΟϯάͷ༰қ͔͞Βɺ 
 ࠓճ͸ͪ͜ΒΛಡΈ·͢

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4PDLFUUDQ@XJUIPVU@GBTU@GBMMCBDL def self.tcp_without_fast_fallback(host, port, ...) # ... Addrinfo.foreach(host, port, nil, :STREAM, ...) {|ai| # ... begin sock = ai.connect(...) rescue SystemCallError last_error = $! next end ret = sock break } # ... end FYUTPDLFUMJCTPDLFUSC

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4PDLFUUDQ@XJUIPVU@GBTU@GBMMCBDL def self.tcp_without_fast_fallback(host, port, ...) # ... Addrinfo.foreach(host, port, nil, :STREAM, ...) {|ai| # ... begin sock = ai.connect(...) rescue SystemCallError last_error = $! next end ret = sock break } # ... end FYUTPDLFUMJCTPDLFUSC "EESJOGPGPSFBDI

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"EESJOGPGPSFBDI FYUTPDLFUMJCTPDLFUSC class Addrinfo # ... def self.foreach(nodename, service, ..., &block) Addrinfo.getaddrinfo(nodename, service, ...).each(&block) end # ... end

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class Addrinfo # ... def self.foreach(nodename, service, ..., &block) Addrinfo.getaddrinfo(nodename, service, ...).each(&block) end # ... end "EESJOGPGPSFBDI "EESJOGPHFUBEESJOGP FYUTPDLFUMJCTPDLFUSC

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"EESJOGPHFUBEESJOGP "EESJOGPHFUBEESJOGP͸ ౉͞Εͨϗετ໊ͱϙʔτ൪߸Λ*1ΞυϨεʹղܾ͠ɺ ͦͷ݁ՌҰཡΛ"EESJOGPΦϒδΣΫτͷ഑ྻͰฦ͢ϝιου (ྫ) Addrinfo.getaddrinfo("localhost", 4567, nil, :STREAM) => [#, #] ϗετ͕*1W*1W྆ํʹରԠ͍ͯ͠Δ৔߹ɺฦΓ஋ʹ͸ ͦͷ྆ํͷΞυϨεΛද͢"EESJOGPΦϒδΣΫτؚ͕·ΕΔ ϗετ໊ ϙʔτ൪߸ ໊લղܾͷώϯτ ղܾͰ͖ͨ*1ΞυϨεҰཡ

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"EESJOGPΦϒδΣΫτ "EESJOGPΦϒδΣΫτ*1ΞυϨε৘ใΛද͢ΦϒδΣΫτ (ྫ) addrinfo # => # addrinfo.ip_address # => "127.0.0.1" addrinfo.ipv4? # => true addrinfo.pfamily # => addrinfo.socktype # => "EESJOGPΦϒδΣΫτʹΞΫηε͢Δ͜ͱͰ ΞυϨεʹؔ͢Δ৘ใΛऔಘͨ͠Γૢ࡞͢Δ͜ͱ͕Ͱ͖Δ ΞυϨεϑΝϛϦ (IPv6 / IPv4) Λද͢਺஋ ௨৴ͷछྨ (ετϦʔϜ / σʔλάϥϜ) Λද͢਺஋

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class Addrinfo # ... def self.foreach(nodename, service, ..., &block) Addrinfo.getaddrinfo(nodename, service, ...).each(&block) end # ... end "EESJOGPGPSFBDI ྫɿ*1Wͱ*1W྆ํʹରԠ͍ͯ͠ΔϗετͰ ɹɹϗετ໊ͱͯ͠MPDBMIPTUΛ౉ͨ͠৔߹ "EESJOGPHFUBEESJOGP͸ϗετ໊Λ໊લղܾ͠ɺ *1WΞυϨεͱ*1WΞυϨεΛͦΕͧΕද͢ "EESJOGPΦϒδΣΫτΛཁૉʹ࣋ͭ഑ྻΛฦ͢ => [#, #] "localhost" FYUTPDLFUMJCTPDLFUSC

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class Addrinfo # ... def self.foreach(nodename, service, ..., &block) Addrinfo.getaddrinfo(nodename, service, ...).each(&block) end # ... end "EESJOGPGPSFBDI "EESJOGPGPSFBDI͸͜ͷ഑ྻʹରͯ͠FBDIΛݺͼग़͠ɺ ֤"EESJOGPΦϒδΣΫτ͝ͱʹϒϩοΫΛ࣮ߦ͢Δ "EESJOGPΦϒδΣΫτͷ഑ྻʹର͢Δ "SSBZFBDI FYUTPDLFUMJCTPDLFUSC

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4PDLFUUDQ@XJUIPVU@GBTU@GBMMCBDL def self.tcp_without_fast_fallback(host, port, ...) # ... Addrinfo.foreach(host, port, nil, :STREAM, ...) {|ai| # ... begin sock = ai.connect(...) rescue SystemCallError last_error = $! next end ret = sock break } # ... end ϒϩοΫม਺ʹ౉͞ΕΔ"EESJOGPΦϒδΣΫτΛ༻͍ͯ ϒϩοΫ಺ͷॲཧΛ࣮ߦ͢Δ "EESJOGPΦϒδΣΫτ FYUTPDLFUMJCTPDLFUSC ࠶ͼ "EESJOGPGPSFBDI͕࣮ߦ͢ΔϒϩοΫ

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4PDLFUUDQ@XJUIPVU@GBTU@GBMMCBDL def self.tcp_without_fast_fallback(host, port, ...) # ... Addrinfo.foreach(host, port, nil, :STREAM, ...) {|ai| # ... begin sock = ai.connect(...) rescue SystemCallError last_error = $! next end ret = sock break } # ... end FYUTPDLFUMJCTPDLFUSC "EESJOGPDPOOFDU

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"EESJOGPDPOOFDU class Addrinfo # ... def connect(...) connect_internal(nil, ...) end # ... end FYUTPDLFUMJCTPDLFUSC

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"EESJOGPDPOOFDU class Addrinfo # ... def connect(...) connect_internal(nil, ...) end # ... end "EESJOGPDPOOFDU@JOUFUOBM FYUTPDLFUMJCTPDLFUSC

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"EESJOGPDPOOFDU@JOUFSOBM class Addrinfo # ... def connect_internal(...) sock = Socket.new(self.pfamily, self.socktype, self.protocol) begin # ... sock.connect(self) rescue Exception sock.close raise end # ... sock end # ... end FYUTPDLFUMJCTPDLFUSC

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"EESJOGPDPOOFDU@JOUFSOBM class Addrinfo # ... def connect_internal(...) sock = Socket.new(self.pfamily, self.socktype, self.protocol) begin # ... sock.connect(self) rescue Exception sock.close raise end # ... sock end # ... end FYUTPDLFUMJCTPDLFUSC 4PDLFUOFX

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"EESJOGPDPOOFDU@JOUFSOBM class Addrinfo # ... def connect_internal(...) sock = Socket.new(self.pfamily, self.socktype, self.protocol) begin # ... sock.connect(self) rescue Exception sock.close raise end # ... sock end # ... end FYUTPDLFUMJCTPDLFUSC 4PDLFUOFX ϗετ಺෦Ͱ৽͍͠ιέοτΛ࡞੒͠ɺ ɹͦΕΛ4PDLFUΦϒδΣΫτͱͯ͠ ɹѻ͑ΔΑ͏ʹͯ͠ฦ͢

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"EESJOGPDPOOFDU@JOUFSOBM class Addrinfo # ... def connect_internal(...) sock = Socket.new(self.pfamily, self.socktype, self.protocol) begin # ... sock.connect(self) rescue Exception sock.close raise end # ... sock end # ... end FYUTPDLFUMJCTPDLFUSC 4PDLFUOFX ➡︎ ͦͷ࣮ଶ͸$ݴޠͰ࣮૷ 3VCZͷ͞ΒͳΔ಺ଆΛ ͷ͍͍͖ͧͯ·͠ΐ͏ ϗετ಺෦Ͱ৽͍͠ιέοτΛ࡞੒͠ɺ ɹͦΕΛ4PDLFUΦϒδΣΫτͱͯ͠ ɹѻ͑ΔΑ͏ʹͯ͠ฦ͢

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4PDLFUJOJUJBMJ[F void Init_socket(void) { // ... rb_cSocket = rb_define_class("Socket", rb_cBasicSocket); // ... rb_define_method(rb_cSocket, "initialize", sock_initialize, -1); // ... } FYUTPDLFUTPDLFUD

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4PDLFUJOJUJBMJ[F void Init_socket(void) { // ... rb_cSocket = rb_define_class("Socket", rb_cBasicSocket); // ... rb_define_method(rb_cSocket, "initialize", sock_initialize, -1); // ... } 3VCZͷ$"1*Λ࢖ͬͯ 4PDLFUΫϥεͱ4PDLFUJOJUJBMJ[F͕ఆٛ͞Ε͍ͯΔ FYUTPDLFUTPDLFUD 4PDLFUΫϥεΛఆٛ 4PDLFUJOJUJBMJ[FΛఆٛ

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4PDLFUJOJUJBMJ[F void Init_socket(void) { // ... rb_cSocket = rb_define_class("Socket", rb_cBasicSocket); // ... rb_define_method(rb_cSocket, "initialize", sock_initialize, -1); // ... } FYUTPDLFUTPDLFUD 4PDLFUJOJUJBMJ[Fͷ಺෦࣮૷ 4PDLFUJOJUJBMJ[F͸ ࣮ମͱͯ͠͸TPDL@JOJUJBMJ[Fؔ਺ʹ࣮૷͞Ε͍ͯΔ

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TPDL@JOJUJBMJ[F 4PDLFUJOJUJBMJ[Fͷ࣮ମ static VALUE sock_initialize(int argc, VALUE *argv, VALUE sock) { VALUE domain, type, protocol; int fd; int d, t; rb_scan_args(argc, argv, "21", &domain, &type, &protocol); // ... fd = rsock_socket(d, t, NUM2INT(protocol)); if (fd < 0) rb_sys_fail("socket(2)"); return rsock_init_sock(sock, fd); } FYUTPDLFUTPDLFUD

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TPDL@JOJUJBMJ[F 4PDLFUJOJUJBMJ[Fͷ࣮ମ static VALUE sock_initialize(int argc, VALUE *argv, VALUE sock) { VALUE domain, type, protocol; int fd; int d, t; rb_scan_args(argc, argv, "21", &domain, &type, &protocol); // ... fd = rsock_socket(d, t, NUM2INT(protocol)); if (fd < 0) rb_sys_fail("socket(2)"); return rsock_init_sock(sock, fd); } ϝιουͷҾ਺ͷॲཧ FYUTPDLFUTPDLFUD

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TPDL@JOJUJBMJ[F 4PDLFUJOJUJBMJ[Fͷ࣮ମ static VALUE sock_initialize(int argc, VALUE *argv, VALUE sock) { VALUE domain, type, protocol; int fd; int d, t; rb_scan_args(argc, argv, "21", &domain, &type, &protocol); // ... fd = rsock_socket(d, t, NUM2INT(protocol)); if (fd < 0) rb_sys_fail("socket(2)"); return rsock_init_sock(sock, fd); } STPDL@TPDLFUؔ਺ FYUTPDLFUTPDLFUD

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TPDL@JOJUJBMJ[F 4PDLFUJOJUJBMJ[Fͷ࣮ମ static VALUE sock_initialize(int argc, VALUE *argv, VALUE sock) { VALUE domain, type, protocol; int fd; int d, t; rb_scan_args(argc, argv, "21", &domain, &type, &protocol); // ... fd = rsock_socket(d, t, NUM2INT(protocol)); if (fd < 0) rb_sys_fail("socket(2)"); return rsock_init_sock(sock, fd); } STPDL@TPDLFUؔ਺͸಺෦Ͱ STPDL@TPDLFUؔ਺ΛݺΜͰ͍Δ FYUTPDLFUTPDLFUD

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STPDL@TPDLFU static int rsock_socket0(int domain, int type, int proto) { // ... int result = socket(domain, type, proto); if (result == -1) return -1; rb_fd_fix_cloexec(result); #ifndef SOCK_NONBLOCK rsock_make_fd_nonblock(result); #endif return result; } FYUTPDLFUJOJUD

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STPDL@TPDLFU static int rsock_socket0(int domain, int type, int proto) { // ... int result = socket(domain, type, proto); if (result == -1) return -1; rb_fd_fix_cloexec(result); #ifndef SOCK_NONBLOCK rsock_make_fd_nonblock(result); #endif return result; } TPDLFU γεςϜίʔϧ STPDL@TPDLFUؔ਺಺Ͱ TPDLFUͱ͍͏γεςϜίʔϧΛݺΜͰ͍Δ aॏཁ FYUTPDLFUJOJUD

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Χʔωϧͱ͸ 6OJYܥ04ʹ͓͍ͯ04ͷத֩ͱͳΔιϑτ΢ΣΞ ϋʔυ΢ΣΞࢿݯΛ؅ཧ͠ɺϓϩάϥϜͷಈ࡞؀ڥΛఏڙ͢Δ γεςϜίʔϧͱ͸ ͷલʹ ୅දతͳ6OJYܥ04NBD04ɺ'SFF#4%ɺ0QFO#4%ɺ-JOVYͳͲͳͲʜ Χʔωϧ 04ͷத֩෦෼

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γεςϜίʔϧͱ͸ Χʔωϧ͕ఏڙ͢ΔػೳΛ ϓϩάϥϜ͔Βར༻͢ΔͨΊͷ࠷΋جຊతͳ"1* γεςϜίʔϧ ྫ ϑΝΠϧΛ։͘ɺಡΈॻ͖͢Δ ϓϩηεΛੜ੒͢Δ ωοτϫʔΫ௨৴Λߦ͏ Χʔωϧ 04ͷத֩෦෼ ϓϩάϥϜ

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STPDL@TPDLFU static int rsock_socket0(int domain, int type, int proto) { // ... int result = socket(domain, type, proto); if (result == -1) return -1; rb_fd_fix_cloexec(result); #ifndef SOCK_NONBLOCK rsock_make_fd_nonblock(result); #endif return result; } ͜ͷϗετ಺ʹιέοτΛ࡞੒͢ΔΑ͏ Χʔωϧʹର໋ͯ͠ྩ͢Δ STPDL@TPDLFUؔ਺͸಺෦తʹTPDLFUΛݺͼग़͢͜ͱͰ ࣮ࡍʹϗετ಺ʹιέοτΛ࡞੒͍ͯ͠Δ FYUTPDLFUJOJUD TPDLFU γεςϜίʔϧ ϗετ ιέοτ

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STPDL@TPDLFU static int rsock_socket0(int domain, int type, int proto) { // ... int result = socket(domain, type, proto); if (result == -1) return -1; rb_fd_fix_cloexec(result); #ifndef SOCK_NONBLOCK rsock_make_fd_nonblock(result); #endif return result; } TPDLFUγεςϜίʔϧ͸ɺ৽͘͠࡞੒ͨ͠ιέοτΛ ಛఆ͢ΔͨΊͷ൪߸ιέοτσΟεΫϦϓλΛฦ͢ ιέοτσΟεΫϦϓλΛऔಘ FYUTPDLFUJOJUD TPDLFU γεςϜίʔϧ

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STPDL@TPDLFU static int rsock_socket0(int domain, int type, int proto) { // ... int result = socket(domain, type, proto); if (result == -1) return -1; rb_fd_fix_cloexec(result); #ifndef SOCK_NONBLOCK rsock_make_fd_nonblock(result); #endif return result; } औಘͨ͠ιέοτσΟεΫϦϓλΛฦͯ͠ऴྃ FYUTPDLFUJOJUD STPDL@TPDLFU͸৽͘͠࡞੒ͨ͠ιέοτͷ ιέοτσΟεΫϦϓλΛฦͯ͠ऴྃ͢Δ ιέοτσΟεΫϦϓλΛऔಘ TPDLFU γεςϜίʔϧ

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TPDL@JOJUJBMJ[F 4PDLFUJOJUJBMJ[Fͷ࣮ମ static VALUE sock_initialize(int argc, VALUE *argv, VALUE sock) { VALUE domain, type, protocol; int fd; int d, t; rb_scan_args(argc, argv, "21", &domain, &type, &protocol); // ... fd = rsock_socket(d, t, NUM2INT(protocol)); if (fd < 0) rb_sys_fail("socket(2)"); return rsock_init_sock(sock, fd); } FYUTPDLFUTPDLFUD ࠶ͼ STPDL@TPDLFUؔ਺ ৽͍͠ιέοτΛ࡞੒ͯ͠ ιέοτσΟεΫϦϓλΛฦ͢ ಺෦ͰSTPDL@TPDLFUؔ਺ΛݺͿ

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TPDL@JOJUJBMJ[F 4PDLFUJOJUJBMJ[Fͷ࣮ମ static VALUE sock_initialize(int argc, VALUE *argv, VALUE sock) { VALUE domain, type, protocol; int fd; int d, t; rb_scan_args(argc, argv, "21", &domain, &type, &protocol); // ... fd = rsock_socket(d, t, NUM2INT(protocol)); if (fd < 0) rb_sys_fail("socket(2)"); return rsock_init_sock(sock, fd); } STPDL@TPDLFUؔ਺ FYUTPDLFUTPDLFUD STPDL@TPDLFUؔ਺ͷฦΓ஋ ৽͘͠࡞੒ͨ͠ιέοτͷ ιέοτσΟεΫϦϓλ Λม਺GEʹ֨ೲ ࠶ͼ ৽͍͠ιέοτΛ࡞੒ͯ͠ ιέοτσΟεΫϦϓλΛฦ͢ ಺෦ͰSTPDL@TPDLFUؔ਺ΛݺͿ

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TPDL@JOJUJBMJ[F 4PDLFUJOJUJBMJ[Fͷ࣮ମ static VALUE sock_initialize(int argc, VALUE *argv, VALUE sock) { VALUE domain, type, protocol; int fd; int d, t; rb_scan_args(argc, argv, "21", &domain, &type, &protocol); // ... fd = rsock_socket(d, t, NUM2INT(protocol)); if (fd < 0) rb_sys_fail("socket(2)"); return rsock_init_sock(sock, fd); } STPDL@JOJU@TPDLؔ਺ FYUTPDLFUTPDLFUD STPDL@JOJU@TPDLؔ਺͸ม਺GEͷιέοτσΟεΫϦϓλΛ σʔλͱͯ͠อ࣋͢Δ4PDLFUΦϒδΣΫτΛ৽ͨʹ࡞੒͢Δ

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TPDL@JOJUJBMJ[F 4PDLFUJOJUJBMJ[Fͷ࣮ମ static VALUE sock_initialize(int argc, VALUE *argv, VALUE sock) { VALUE domain, type, protocol; int fd; int d, t; rb_scan_args(argc, argv, "21", &domain, &type, &protocol); // ... fd = rsock_socket(d, t, NUM2INT(protocol)); if (fd < 0) rb_sys_fail("socket(2)"); return rsock_init_sock(sock, fd); } ฦΓ஋ΛSFUVSO ࠷ޙʹɺTPDL@JOJUJBMJ[F 4PDLFUJOJUJBMJ[F ͸ ࡞੒ͨ͠4PDLFUΦϒδΣΫτΛฦͯ͠ऴྃ FYUTPDLFUTPDLFUD

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TPDL@JOJUJBMJ[F 4PDLFUJOJUJBMJ[Fͷ࣮ମ static VALUE sock_initialize(int argc, VALUE *argv, VALUE sock) { VALUE domain, type, protocol; int fd; int d, t; rb_scan_args(argc, argv, "21", &domain, &type, &protocol); // ... fd = rsock_socket(d, t, NUM2INT(protocol)); if (fd < 0) rb_sys_fail("socket(2)"); return rsock_init_sock(sock, fd); } 4PDLFUOFXͷ಺෦࣮૷͸͜͜·Ͱ FYUTPDLFUTPDLFUD

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"EESJOGPDPOOFDU@JOUFSOBM class Addrinfo # ... def connect_internal(...) sock = Socket.new(self.pfamily, self.socktype, self.protocol) begin # ... sock.connect(self) rescue Exception sock.close raise end # ... sock end # ... end FYUTPDLFUMJCTPDLFUSC 4PDLFUOFX ࠶ͼ ϗετ಺෦Ͱ৽͍͠ιέοτΛ࡞੒͠ɺ ɹ͜ΕΛϥοϓ͢Δ4PDLFUΦϒδΣΫτΛฦ͢

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"EESJOGPDPOOFDU@JOUFSOBM class Addrinfo # ... def connect_internal(...) sock = Socket.new(self.pfamily, self.socktype, self.protocol) begin # ... sock.connect(self) rescue Exception sock.close raise end # ... sock end # ... end FYUTPDLFUMJCTPDLFUSC ࡞੒ͨ͠4PDLFUΦϒδΣΫτΛม਺TPDLʹ֨ೲ ม਺TPDLʹରͯ͠4PDLFUDPOOFDU TFMGѼઌͷΞυϨε৘ใ "EESJOGPΦϒδΣΫτ

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"EESJOGPDPOOFDU@JOUFSOBM class Addrinfo # ... def connect_internal(...) sock = Socket.new(self.pfamily, self.socktype, self.protocol) begin # ... sock.connect(self) rescue Exception sock.close raise end # ... sock end # ... end FYUTPDLFUMJCTPDLFUSC 4PDLFUDPOOFDU΋$Ͱ࣮૷͞Ε͍ͯΔ ࡞੒ͨ͠4PDLFUΦϒδΣΫτΛม਺TPDLʹอଘ TFMGѼઌͷΞυϨε৘ใ "EESJOGPΦϒδΣΫτ ม਺TPDLʹରͯ͠4PDLFUDPOOFDU

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4PDLFUDPOOFDU void Init_socket(void) { // ... rb_cSocket = rb_define_class("Socket", rb_cBasicSocket); // ... rb_define_method(rb_cSocket, "initialize", sock_initialize, -1); rb_define_method(rb_cSocket, "connect", sock_connect, 1); // ... } FYUTPDLFUTPDLFUD 4PDLFUDPOOFDUΛఆٛ 4PDLFUΫϥεΛఆٛ 4PDLFUDPOOFDUͷ಺෦࣮૷ 4PDLFUDPOOFDU͸ ࣮ମͱͯ͠͸TPDL@DPOOFDUؔ਺ʹ࣮૷͞Ε͍ͯΔ

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static VALUE sock_connect(VALUE self, VALUE addr) { // ... int result = rsock_connect( self, (struct sockaddr*)RSTRING_PTR(addr), RSTRING_SOCKLEN(addr), 0, RUBY_IO_TIMEOUT_DEFAULT ); // ... return INT2FIX(result); } TPDL@DPOOFDU 4PDLFUDPOOFDUͷ࣮ମ FYUTPDLFUTPDLFUD

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static VALUE sock_connect(VALUE self, VALUE addr) { // ... int result = rsock_connect( self, (struct sockaddr*)RSTRING_PTR(addr), RSTRING_SOCKLEN(addr), 0, RUBY_IO_TIMEOUT_DEFAULT ); // ... return INT2FIX(result); } TPDL@DPOOFDU 4PDLFUDPOOFDUͷ࣮ମ sock.connect(self) 4PDLFUDPOOFDUͷϨγʔό 4PDLFUΦϒδΣΫτ FYUTPDLFUTPDLFUD

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static VALUE sock_connect(VALUE self, VALUE addr) { // ... int result = rsock_connect( self, (struct sockaddr*)RSTRING_PTR(addr), RSTRING_SOCKLEN(addr), 0, RUBY_IO_TIMEOUT_DEFAULT ); // ... return INT2FIX(result); } TPDL@DPOOFDU 4PDLFUDPOOFDUͷ࣮ମ sock.connect(self) ѼઌͷΞυϨε৘ใΛอ࣋͢Δ 4PDLFUDPOOFDUͷҾ਺ "EESJOGPΦϒδΣΫτ FYUTPDLFUTPDLFUD

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static VALUE sock_connect(VALUE self, VALUE addr) { // ... int result = rsock_connect( self, (struct sockaddr*)RSTRING_PTR(addr), RSTRING_SOCKLEN(addr), 0, RUBY_IO_TIMEOUT_DEFAULT ); // ... return INT2FIX(result); } TPDL@DPOOFDU 4PDLFUDPOOFDUͷ࣮ମ STPDL@DPOOFDUؔ਺ FYUTPDLFUTPDLFUD Ϩγʔόͷ4PDLFUΦϒδΣΫτ Ҿ਺Ͱड͚औͬͨѼઌͷΞυϨε৘ใ sock.connect(self)

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TPDL@DPOOFDU 4PDLFUDPOOFDUͷ࣮ମ static VALUE sock_connect(VALUE self, VALUE addr) { // ... int result = rsock_connect( self, (struct sockaddr*)RSTRING_PTR(addr), RSTRING_SOCKLEN(addr), 0, RUBY_IO_TIMEOUT_DEFAULT ); // ... return INT2FIX(result); } STPDL@DPOOFDUؔ਺͸಺෦Ͱ DPOOFDU@CMPDLJOHؔ਺ΛݺΜͰ͍Δ FYUTPDLFUTPDLFUD

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DPOOFDU@CMPDLJOH static VALUE connect_blocking(void *data) { struct connect_arg *arg = data; return (VALUE)connect(arg->fd, arg->sockaddr, arg->len); } FYUTPDLFUJOJUD

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DPOOFDU@CMPDLJOH static VALUE connect_blocking(void *data) { struct connect_arg *arg = data; return (VALUE)connect(arg->fd, arg->sockaddr, arg->len); } FYUTPDLFUJOJUD Ҿ਺EBUB DPOOFDU@CMPDLJOHؔ਺͸Ҿ਺EBUBΛհͯ͠ STPDL@DPOOFDUؔ਺ʹ౉ͨ͠Ҿ਺ͷத਎Λड͚औΔ ɾϨγʔόͷ4PDLFUΦϒδΣΫτ͔Β औΓग़ͨ͠಺෦৘ใ ɾѼઌͷΞυϨε৘ใ ʜΛؚΉ

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DPOOFDU@CMPDLJOH static VALUE connect_blocking(void *data) { struct connect_arg *arg = data; return (VALUE)connect(arg->fd, arg->sockaddr, arg->len); } FYUTPDLFUJOJUD Ҿ਺EBUBͷத਎Λม਺BSHʹ֨ೲ

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DPOOFDU@CMPDLJOH static VALUE connect_blocking(void *data) { struct connect_arg *arg = data; return (VALUE)connect(arg->fd, arg->sockaddr, arg->len); } DPOOFDU@CMPDLJOHؔ਺಺Ͱ γεςϜίʔϧDPOOFDUΛݺͿ aॏཁ DPOOFDU γεςϜίʔϧ ࢦఆͷιέοτΛ࢖ͬͯѼઌͱͷ઀ଓΛ։࢝͢Δ FYUTPDLFUJOJUD ΫϥΠΞϯτ ઀ଓΛ։࢝ Ѽઌ ྫ

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DPOOFDU@CMPDLJOH static VALUE connect_blocking(void *data) { struct connect_arg *arg = data; return (VALUE)connect(arg->fd, arg->sockaddr, arg->len); } ม਺BSH͔ΒιέοτσΟεΫϦϓλΛऔΓग़͠ɺ DPOOFDUͷୈҰҾ਺ʹ౉͢ɻ ͜ΕʹΑΓʮͲͷιέοτΛ࢖͏͔ʯΛࢦఆ͍ͯ͠Δ FYUTPDLFUJOJUD ม਺BSH͔ΒऔΓग़ͨ͠ιέοτσΟεΫϦϓλ

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DPOOFDU@CMPDLJOH static VALUE connect_blocking(void *data) { struct connect_arg *arg = data; return (VALUE)connect(arg->fd, arg->sockaddr, arg->len); } ม਺BSH͔ΒऔΓग़ͨ͠઀ଓઌͷΞυϨε৘ใ ม਺BSH͔ΒѼઌͷΞυϨε৘ใΛऔΓग़͠ɺ DPOOFDUͷୈೋҾ਺ʹ౉͢ɻ ͜ΕʹΑΓʮͲ͜Ѽʹ઀ଓ͢Δ͔ʯΛࢦఆ͍ͯ͠Δ FYUTPDLFUJOJUD

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DPOOFDU@CMPDLJOH static VALUE connect_blocking(void *data) { struct connect_arg *arg = data; return (VALUE)connect(arg->fd, arg->sockaddr, arg->len); } ઀ଓʹ੒ޭ͢ΔͱDPOOFDU͸଴ػΛղআ͠ ౰֘ιέοτ͸Ѽઌϗετͱ઀ଓࡁΈͷঢ়ଶʹͳΔ FYUTPDLFUJOJUD ઀ଓࢼߦ։࢝ޙɺ઀ଓঢ়ଶ͕֬ఆ͢Δ·Ͱ଴ػ͢Δ ˞౰֘ιέοτ͕ϊϯϒϩοΩϯάϞʔυʹઃఆ͞Ε͍ͯͳ͍৔߹ ˞ ΫϥΠΞϯτ αʔό aa઀ଓཱ֬

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DPOOFDU@CMPDLJOH static VALUE connect_blocking(void *data) { struct connect_arg *arg = data; return (VALUE)connect(arg->fd, arg->sockaddr, arg->len); } 4PDLFUDPOOFDUͷ಺෦࣮૷͸͜͜·Ͱ FYUTPDLFUJOJUD

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"EESJOGPDPOOFDU@JOUFSOBM class Addrinfo # ... def connect_internal(...) sock = Socket.new(self.pfamily, self.socktype, self.protocol) begin # ... sock.connect(self) rescue Exception sock.close raise end # ... sock end # ... end FYUTPDLFUMJCTPDLFUSC ࠶ͼ 4PDLFUDPOOFDU ࢦఆͷιέοτΛ࢖ͬͯѼઌʹ઀ଓΛ։࢝͢Δ

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"EESJOGPDPOOFDU@JOUFSOBM class Addrinfo # ... def connect_internal(...) sock = Socket.new(self.pfamily, self.socktype, self.protocol) begin # ... sock.connect(self) rescue Exception sock.close raise end # ... sock end # ... end "EESJOGPDPOOFDU@JOUFSOBM͸ɺѼઌϗετͱ ઀ଓࡁΈͷ4PDLFUΦϒδΣΫτΛฦͯ͠ऴྃ αʔόͱ઀ଓࡁΈͷ4PDLFUΦϒδΣΫτΛฦ͢ FYUTPDLFUMJCTPDLFUSC 4PDLFUDPOOFDU

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4PDLFUUDQ@XJUIPVU@GBTU@GBMMCBDL def self.tcp_without_fast_fallback(host, port, ...) # ... Addrinfo.foreach(host, port, nil, :STREAM, ...) {|ai| # ... begin sock = ai.connect(...) rescue SystemCallError last_error = $! next end ret = sock break } # ... ret end FYUTPDLFUMJCTPDLFUSC ࠶ͼ "EESJOGPDPOOFDU 4PDLFUΦϒδΣΫτΛ࡞੒ˠ઀ଓ ಺෦Ͱ"EESJOGPDPOOFDU@JOUFSOBMΛݺͿ

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4PDLFUUDQ@XJUIPVU@GBTU@GBMMCBDL def self.tcp_without_fast_fallback(host, port, ...) # ... Addrinfo.foreach(host, port, nil, :STREAM, ...) {|ai| # ... begin sock = ai.connect(...) rescue SystemCallError last_error = $! next end ret = sock break } # ... ret end "EESJOGPDPOOFDUͷฦΓ஋ͱͯ͠ ઀ଓࡁΈͷ4PDLFUΦϒδΣΫτΛม਺SFUʹอଘ্ͨ͠ "EESJOGPGPSFBDIͷϧʔϓΛCSFBL ઀ଓࡁΈͷ4PDLFUΦϒδΣΫτΛ ม਺TPDLʹอଘ ม਺TPDLΛม਺SFUʹอଘͯ͠CSFBL FYUTPDLFUMJCTPDLFUSC

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4PDLFUUDQ@XJUIPVU@GBTU@GBMMCBDL def self.tcp_without_fast_fallback(host, port, ...) # ... Addrinfo.foreach(host, port, nil, :STREAM, ...) {|ai| # ... begin sock = ai.connect(...) rescue SystemCallError last_error = $! next end ret = sock break } # ... ret end ࠷ޙʹม਺SFU ઀ଓࡁΈͷ4PDLFUΦϒδΣΫτ Λ ฦͯ͠4PDLFUUDQ@XJUIPVU@GBTU@GBMMCBDL͸ऴྃ ฦΓ஋ FYUTPDLFUMJCTPDLFUSC

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4PDLFUUDQ def self.tcp(host, port, ... fast_fallback: tcp_fast_fallback, &) sock = if fast_fallback && !(host && ip_address?(host)) tcp_with_fast_fallback(host, port, ...) else tcp_without_fast_fallback(host, port, ...) end if block_given? begin yield sock ensure sock.close end else sock end end FYUTPDLFUMJCTPDLFUSC ࠶ͼ 4PDLFUUDQ@XJUIPVU@GBTU@GBMMCBDL ઀ଓࡁΈͷ4PDLFUΦϒδΣΫτΛऔಘ

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4PDLFUUDQ def self.tcp(host, port, ... fast_fallback: tcp_fast_fallback, &) sock = if fast_fallback && !(host && ip_address?(host)) tcp_with_fast_fallback(host, port, ...) else tcp_without_fast_fallback(host, port, ...) end if block_given? begin yield sock ensure sock.close end else sock end end FYUTPDLFUMJCTPDLFUSC ฦΓ஋ͷ4PDLFUΦϒδΣΫτΛม਺TPDLʹ֨ೲ 4PDLFUUDQ@XJUIPVU@GBTU@GBMMCBDLͷฦΓ஋Ͱ͋Δ ઀ଓࡁΈ4PDLFUΦϒδΣΫτΛม਺TPDLʹอଘ 4PDLFUUDQ@XJUIPVU@GBTU@GBMMCBDL ઀ଓࡁΈͷ4PDLFUΦϒδΣΫτΛऔಘ

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4PDLFUUDQ def self.tcp(host, port, ... fast_fallback: tcp_fast_fallback, &) sock = if fast_fallback && !(host && ip_address?(host)) tcp_with_fast_fallback(host, port, ...) else tcp_without_fast_fallback(host, port, ...) end if block_given? begin yield sock ensure sock.close end else sock end end ઀ଓࡁΈͷ4PDLFUΦϒδΣΫτΛ࢖ͬͯ 4PDLFUUDQͷϒϩοΫΛ࣮ߦ͢Δ FYUTPDLFUMJCTPDLFUSC Socket.tcp(...) do |sock| sock.write "Hi" message = sock.read puts message end

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4PDLFUUDQ def self.tcp(host, port, ... fast_fallback: tcp_fast_fallback, &) sock = if fast_fallback && !(host && ip_address?(host)) tcp_with_fast_fallback(host, port, ...) else tcp_without_fast_fallback(host, port, ...) end if block_given? begin yield sock ensure sock.close end else sock end end ઀ଓࡁΈͷ4PDLFUΦϒδΣΫτΛ࢖ͬͯ 4PDLFUUDQͷϒϩοΫΛ࣮ߦ͢Δ Socket.tcp(...) do |sock| sock.write "Hi" message = sock.read puts message end aΰʔϧ FYUTPDLFUMJCTPDLFUSC

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4PDLFUUDQͷ͘͠Έ ΫϥΠΞϯτ Socket.tcp Λ࣮ߦ

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4PDLFUUDQͷ͘͠Έ ΫϥΠΞϯτ Socket.tcp 1. Addrinfo.getaddrinfo Λ࣮ߦ ϗετ໊Λ*1ΞυϨεʹղܾ͢Δ ΞυϨε৘ใΛ"EESJOGPΦϒδΣΫτͯ͠ѻ͑ΔΑ͏ʹ͢Δ

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4PDLFUUDQͷ͘͠Έ ΫϥΠΞϯτ Socket.tcp 2. Socket.new (Socket#initialize) socket Λ࣮ߦ ϗετ಺ʹιέοτΛ࡞੒͢Δ ιέοτΛ4PLDFUΦϒδΣΫτͯ͠ѻ͑ΔΑ͏ʹ͢Δ ➡︎

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4PDLFUUDQͷ͘͠Έ ΫϥΠΞϯτ Socket.tcp 3. Socket#connect connect Λ࣮ߦ ࡞੒ͨ͠ιέοτΛར༻͠ɺ ղܾͨ͠*1ΞυϨεѼʹ઀ଓ։࢝ˠ੒ޭͨ͠Β଴ػղআ αʔόͱ઀ଓࡁΈͷ4PDLFUΦϒδΣΫτΛฦ͢ ➡︎

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4PDLFUUDQͷ͘͠Έ ΫϥΠΞϯτ Socket.tcp 4. Λ࣮ߦ ͜ͷ4PDLFUΦϒδΣΫτʹ ϦΫΤετϝοηʔδΛॻ͖ࠐΜͩΓ ૹ৴ ϨεϙϯεϝοηʔδΛಡΈࠐΜͩΓ ड৴ ͢Δ ϒϩοΫΛ࣮ߦ aΰʔϧ

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4PDLFUUDQ@TFSWFS@MPPQ αʔό ฤ Socket.tcp_server_loop("localhost", 4567) do |sock| message = sock.readpartial 100 sock.write message ensure sock.close end

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4PDLFUUDQ@TFSWFS@MPPQ class Socket # ... def self.tcp_server_loop(host=nil, port, &b) tcp_server_sockets(host, port) {|sockets| accept_loop(sockets, &b) } end # ... end FYUTPDLFUMJCTPDLFUSC

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class Socket # ... def self.tcp_server_loop(host=nil, port, &b) tcp_server_sockets(host, port) {|sockets| accept_loop(sockets, &b) } end # ... end 4PDLFUUDQ@TFSWFS@MPPQ 4PDLFUUDQ@TFSWFS@TPDLFUT ϗετ໊ ϙʔτ൪߸ FYUTPDLFUMJCTPDLFUSC 4PDLFUUDQ@TFSWFS@TPDLFUTΛݺͼग़͢ αʔόࣗ਎ͷ

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4PDLFUUDQ@TFSWFS@TPDLFUT def self.tcp_server_sockets(host=nil, port, &b) if port == 0 sockets = tcp_server_sockets_port0(host) else last_error = nil sockets = [] begin # ... rescue Exception sockets.each(&:close) raise end # ... end end ϗετ໊ɾϙʔτ൪߸ FYUTPDLFUMJCTPDLFUSC

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4PDLFUUDQ@TFSWFS@TPDLFUT def self.tcp_server_sockets(host=nil, port, &b) if port == 0 sockets = tcp_server_sockets_port0(host) else last_error = nil sockets = [] begin # ... rescue Exception sockets.each(&:close) raise end # ... end end ϙʔτ൪߸ʹΛ౉͍ͯ͠Δ৔߹ ϙʔτ൪߸ʹҎ֎Λ౉͍ͯ͠Δ৔߹ ίʔυϦʔσΟϯάͷ༰қ͔͞Βɺ ࠓճ͸ͪ͜ΒΛಡΈ·͢ ϗετ໊ɾϙʔτ൪߸ FYUTPDLFUMJCTPDLFUSC

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4PDLFUUDQ@TFSWFS@TPDLFUT 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 # ... } # ... end FYUTPDLFUMJCTPDLFUSC ˞if port == 0ͷelseઅͷத

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4PDLFUUDQ@TFSWFS@TPDLFUT 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 # ... } # ... end "EESJOGPGPSFBDI FYUTPDLFUMJCTPDLFUSC ˞if port == 0ͷelseઅͷத αʔόࣗ਎ͷϗετ໊ͷ໊લղܾΛߦ͏

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4PDLFUUDQ@TFSWFS@TPDLFUT 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 # ... } # ... end [#, #] FYUTPDLFUMJCTPDLFUSC "localhost" "EESJOGPΦϒδΣΫτ ˞if port == 0ͷelseઅͷத ˞ྫ ˞ྫ ղܾͨ͠*1ΞυϨεΛද͢"EESJOGPΦϒδΣΫτ͕ ϒϩοΫม਺BJʹ౉ͬͯ͘Δ

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4PDLFUUDQ@TFSWFS@TPDLFUT 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 # ... } # ... end "EESJOGPMJTUFO FYUTPDLFUMJCTPDLFUSC ˞if port == 0ͷelseઅͷத "EESJOGPΦϒδΣΫτ

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"EESJOGPMJTUFO class Addrinfo def listen(backlog=Socket::SOMAXCONN) sock = Socket.new(self.pfamily, self.socktype, self.protocol) begin # ... sock.bind(self) sock.listen(backlog) rescue Exception sock.close raise end # ... sock end end FYUTPDLFUMJCTPDLFUSC

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"EESJOGPMJTUFO class Addrinfo def listen(backlog=Socket::SOMAXCONN) sock = Socket.new(self.pfamily, self.socktype, self.protocol) begin # ... sock.bind(self) sock.listen(backlog) rescue Exception sock.close raise end # ... sock end end FYUTPDLFUMJCTPDLFUSC 4PDLFUOFX ৽͍͠4PDLFUΦϒδΣΫτΛ࡞੒͢Δ

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"EESJOGPMJTUFO class Addrinfo def listen(backlog=Socket::SOMAXCONN) sock = Socket.new(self.pfamily, self.socktype, self.protocol) begin # ... sock.bind(self) sock.listen(backlog) rescue Exception sock.close raise end # ... sock end end FYUTPDLFUMJCTPDLFUSC ม਺TPDLʹରͯ͠4PDLFUCJOE TFMGαʔόࣗ਎ͷΞυϨε৘ใ "EESJOGPΦϒδΣΫτ ࡞੒ͨ͠4PDLFUΦϒδΣΫτʹରͯ͠ 4PDLFUCJOEϝιουΛݺͿ ࡞੒ͨ͠4PDLFUΦϒδΣΫτΛม਺TPDLʹ֨ೲ

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4PDLFUCJOE void Init_socket(void) { // ... rb_cSocket = rb_define_class("Socket", rb_cBasicSocket); // ... rb_define_method(rb_cSocket, "bind", sock_bind, 1); // ... } 4PDLFUCJOE͸ ࣮ମͱͯ͠͸TPDL@CJOEؔ਺ʹ࣮૷͞Ε͍ͯΔ FYUTPDLFUTPDLFUD 4PDLFUCJOEΛఆٛ 4PDLFUΫϥεΛఆٛ 4PDLFUCJOEͷ಺෦࣮૷

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TPDL@CJOE 4PDLFUCJOEͷ࣮ମ static VALUE sock_bind(VALUE sock, VALUE addr) { VALUE rai; rb_io_t *fptr; SockAddrStringValueWithAddrinfo(addr, rai); GetOpenFile(sock, fptr); if (bind(fptr->fd, (struct sockaddr*)RSTRING_PTR(addr), RSTRING_SOCKLEN(addr)) < 0) { rsock_sys_fail_raddrinfo_or_sockaddr("bind(2)", addr, rai); } return INT2FIX(0); } FYUTPDLFUTPDLFUD

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TPDL@CJOE 4PDLFUCJOEͷ࣮ମ static VALUE sock_bind(VALUE sock, VALUE addr) { VALUE rai; rb_io_t *fptr; SockAddrStringValueWithAddrinfo(addr, rai); GetOpenFile(sock, fptr); if (bind(fptr->fd, (struct sockaddr*)RSTRING_PTR(addr), RSTRING_SOCKLEN(addr)) < 0) { rsock_sys_fail_raddrinfo_or_sockaddr("bind(2)", addr, rai); } return INT2FIX(0); } sock.bind(self) ୈҰҾ਺ʜ4PDLFUCJOEͷϨγʔό 4PDLFUΦϒδΣΫτ ୈೋҾ਺ʜ4PDLFUCJOEͷҾ਺ "EESJOGPΦϒδΣΫτ ࣗ਎ͷΞυϨε৘ใΛอ࣋͢Δ FYUTPDLFUTPDLFUD

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static VALUE sock_bind(VALUE sock, VALUE addr) { VALUE rai; rb_io_t *fptr; SockAddrStringValueWithAddrinfo(addr, rai); GetOpenFile(sock, fptr); if (bind(fptr->fd, (struct sockaddr*)RSTRING_PTR(addr), RSTRING_SOCKLEN(addr)) < 0) { rsock_sys_fail_raddrinfo_or_sockaddr("bind(2)", addr, rai); } return INT2FIX(0); } TPDL@CJOE 4PDLFUCJOEͷ࣮ମ Ϩγʔόͷ4PDLFUΦϒδΣΫτ͔Β ಺෦৘ใΛऔಘͯ͠ม਺GQUSʹอଘ FYUTPDLFUTPDLFUD (FU0QFO'JMFϚΫϩ

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static VALUE sock_bind(VALUE sock, VALUE addr) { VALUE rai; rb_io_t *fptr; SockAddrStringValueWithAddrinfo(addr, rai); GetOpenFile(sock, fptr); if (bind(fptr->fd, (struct sockaddr*)RSTRING_PTR(addr), RSTRING_SOCKLEN(addr)) < 0) { rsock_sys_fail_raddrinfo_or_sockaddr("bind(2)", addr, rai); } return INT2FIX(0); } TPDL@CJOE 4PDLFUCJOEͷ࣮ମ TPDL@CJOEؔ਺಺ͰγεςϜίʔϧCJOEΛݺΜͰ͍Δ aॏཁ FYUTPDLFUTPDLFUD ࢦఆͷιέοτʹಛఆͷΞυϨεΛඥ͚ͮΔ CJOE γεςϜίʔϧ

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static VALUE sock_bind(VALUE sock, VALUE addr) { VALUE rai; rb_io_t *fptr; SockAddrStringValueWithAddrinfo(addr, rai); GetOpenFile(sock, fptr); if (bind(fptr->fd, (struct sockaddr*)RSTRING_PTR(addr), RSTRING_SOCKLEN(addr)) < 0) { rsock_sys_fail_raddrinfo_or_sockaddr("bind(2)", addr, rai); } return INT2FIX(0); } TPDL@CJOE 4PDLFUCJOEͷ࣮ମ ม਺GQUS͔ΒऔΓग़ͨ͠ιέοτσΟεΫϦϓλΛ CJOEͷୈҰҾ਺ʹ౉͢ɻ ͜ΕʹΑΓʮͲͷιέοτΛ࢖͏͔ʯΛࢦఆ͍ͯ͠Δ ม਺GQUS͔ΒऔΓग़ͨ͠ιέοτσΟεΫϦϓλ FYUTPDLFUTPDLFUD

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static VALUE sock_bind(VALUE sock, VALUE addr) { VALUE rai; rb_io_t *fptr; SockAddrStringValueWithAddrinfo(addr, rai); GetOpenFile(sock, fptr); if (bind(fptr->fd, (struct sockaddr*)RSTRING_PTR(addr), RSTRING_SOCKLEN(addr)) < 0) { rsock_sys_fail_raddrinfo_or_sockaddr("bind(2)", addr, rai); } return INT2FIX(0); } TPDL@CJOE 4PDLFUCJOEͷ࣮ମ CJOEͷୈೋҾ਺ʹαʔόࣗ਎ͷΞυϨε৘ใΛ౉͢ɻ ͜ΕʹΑΓʮͲͷΞυϨεΛιέοτʹඥ͚ͮΔ͔ʯΛ ࢦఆ͍ͯ͠Δ ࣗ਎ͷΞυϨε৘ใ FYUTPDLFUTPDLFUD

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static VALUE sock_bind(VALUE sock, VALUE addr) { VALUE rai; rb_io_t *fptr; SockAddrStringValueWithAddrinfo(addr, rai); GetOpenFile(sock, fptr); if (bind(fptr->fd, (struct sockaddr*)RSTRING_PTR(addr), RSTRING_SOCKLEN(addr)) < 0) { rsock_sys_fail_raddrinfo_or_sockaddr("bind(2)", addr, rai); } return INT2FIX(0); } TPDL@CJOE 4PDLFUCJOEͷ࣮ମ CJOEΛݺͼग़͢͜ͱʹΑΓɺ ʮͲͷιέοτ͕Ͳͷ*1ΞυϨεͰ ɹϦΫΤετΛ଴ػ͢Δ͔ʯΛࢦఆ͍ͯ͠Δ FYUTPDLFUTPDLFUD ϦΫΤετΛ଴ػ͢ΔΞυϨε *1ΞυϨεΛඥ෇͚ ྫ

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static VALUE sock_bind(VALUE sock, VALUE addr) { VALUE rai; rb_io_t *fptr; SockAddrStringValueWithAddrinfo(addr, rai); GetOpenFile(sock, fptr); if (bind(fptr->fd, (struct sockaddr*)RSTRING_PTR(addr), RSTRING_SOCKLEN(addr)) < 0) { rsock_sys_fail_raddrinfo_or_sockaddr("bind(2)", addr, rai); } return INT2FIX(0); } TPDL@CJOE 4PDLFUCJOEͷ࣮ମ 4PDLFUCJOEͷ಺෦࣮૷͸͜͜·Ͱ FYUTPDLFUTPDLFUD *1ΞυϨεΛඥ෇͚

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"EESJOGPMJTUFO class Addrinfo def listen(backlog=Socket::SOMAXCONN) sock = Socket.new(self.pfamily, self.socktype, self.protocol) begin sock.ipv6only! if self.ipv6? # ... sock.bind(self) sock.listen(backlog) rescue Exception sock.close raise end # ... sock end end FYUTPDLFUMJCTPDLFUSC 4PDLFUCJOE ࢦఆͷιέοτͱࣗ਎ͷΞυϨεΛඥ͚ͮΔ ࠶ͼ

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"EESJOGPMJTUFO class Addrinfo def listen(backlog=Socket::SOMAXCONN) sock = Socket.new(self.pfamily, self.socktype, self.protocol) begin sock.ipv6only! if self.ipv6? # ... sock.bind(self) sock.listen(backlog) rescue Exception sock.close raise end # ... sock end end FYUTPDLFUMJCTPDLFUSC 4PDLFUMJTUFO

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4PDLFUMJTUFO void Init_socket(void) { // ... rb_cSocket = rb_define_class("Socket", rb_cBasicSocket); // ... rb_define_method(rb_cSocket, "bind", sock_bind, 1); rb_define_method(rb_cSocket, "listen", rsock_sock_listen, 1); // ... } FYUTPDLFUTPDLFUD 4PDLFUΫϥεΛఆٛ 4PDLFUMJTUFO͸ ࣮ମͱͯ͠͸STPDL@TPDL@MJTUFOؔ਺ʹ࣮૷͞Ε͍ͯΔ 4PDLFUMJTUFOΛఆٛ 4PDLFUMJTUFOͷ಺෦࣮૷

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STPDL@TPDL@MJTUFO 4PDLFUMJTUFOͷ࣮ମ VALUE rsock_sock_listen(VALUE sock, VALUE log) { rb_io_t *fptr; int backlog; backlog = NUM2INT(log); GetOpenFile(sock, fptr); if (listen(fptr->fd, backlog) < 0) rb_sys_fail("listen(2)"); return INT2FIX(0); }

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STPDL@TPDL@MJTUFO 4PDLFUMJTUFOͷ࣮ମ VALUE rsock_sock_listen(VALUE sock, VALUE log) { rb_io_t *fptr; int backlog; backlog = NUM2INT(log); GetOpenFile(sock, fptr); if (listen(fptr->fd, backlog) < 0) rb_sys_fail("listen(2)"); return INT2FIX(0); } 4PDLFUMJTUFOͷϨγʔό 4PDLFUΦϒδΣΫτ Ϩγʔόͷ4PDLFUΦϒδΣΫτ͔Β ಺෦৘ใΛऔಘͯ͠ม਺GQUSʹอଘ (FU0QFO'JMFϚΫϩ

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VALUE rsock_sock_listen(VALUE sock, VALUE log) { rb_io_t *fptr; int backlog; backlog = NUM2INT(log); GetOpenFile(sock, fptr); if (listen(fptr->fd, backlog) < 0) rb_sys_fail("listen(2)"); return INT2FIX(0); } STPDL@TPDL@MJTUFO 4PDLFUMJTUFOͷ࣮ମ STPDL@TPDL@MJTUFOؔ਺಺Ͱ γεςϜίʔϧMJOTUFOΛݺΜͰ͍Δ aॏཁ MJTUFO γεςϜίʔϧ ࢦఆͷιέοτͰ઀ଓΛ଴ͪड͚Δ

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VALUE rsock_sock_listen(VALUE sock, VALUE log) { rb_io_t *fptr; int backlog; backlog = NUM2INT(log); GetOpenFile(sock, fptr); if (listen(fptr->fd, backlog) < 0) rb_sys_fail("listen(2)"); return INT2FIX(0); } STPDL@TPDL@MJTUFO 4PDLFUMJTUFOͷ࣮ମ ม਺GQUS͔ΒऔΓग़ͨ͠ιέοτσΟεΫϦϓλ ม਺GQUS͔ΒऔΓग़ͨ͠ιέοτσΟεΫϦϓλΛ MJTUFOͷୈҰҾ਺ʹ౉͢ɻ ͜ΕʹΑΓʮͲͷιέοτΛ࢖͏͔ʯΛࢦఆ͍ͯ͠Δ

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VALUE rsock_sock_listen(VALUE sock, VALUE log) { rb_io_t *fptr; int backlog; backlog = NUM2INT(log); GetOpenFile(sock, fptr); if (listen(fptr->fd, backlog) < 0) rb_sys_fail("listen(2)"); return INT2FIX(0); } STPDL@TPDL@MJTUFO 4PDLFUMJTUFOͷ࣮ମ MJTUFOΛݺͼग़͢͜ͱʹΑΓɺ ࣮ࡍʹ͜ͷιέοτͰͷ઀ଓ଴ػ͕։࢝͢Δ ྫ ઀ଓ଴ͪ

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VALUE rsock_sock_listen(VALUE sock, VALUE log) { rb_io_t *fptr; int backlog; backlog = NUM2INT(log); GetOpenFile(sock, fptr); if (listen(fptr->fd, backlog) < 0) rb_sys_fail("listen(2)"); return INT2FIX(0); } STPDL@TPDL@MJTUFO 4PDLFUMJTUFOͷ࣮ମ 4PDLFUMJTUFOͷ಺෦࣮૷͸͜͜·Ͱ ઀ଓ଴ͪ

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"EESJOGPMJTUFO class Addrinfo def listen(backlog=Socket::SOMAXCONN) sock = Socket.new(self.pfamily, self.socktype, self.protocol) begin sock.ipv6only! if self.ipv6? # ... sock.bind(self) sock.listen(backlog) rescue Exception sock.close raise end # ... sock end end FYUTPDLFUMJCTPDLFUSC ࠶ͼ 4PDLFUMJTUFO ࢦఆͷιέοτͰ઀ଓΛ଴ػ͢Δ

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"EESJOGPMJTUFO class Addrinfo def listen(backlog=Socket::SOMAXCONN) sock = Socket.new(self.pfamily, self.socktype, self.protocol) begin sock.ipv6only! if self.ipv6? # ... sock.bind(self) sock.listen(backlog) rescue Exception sock.close raise end # ... sock end end FYUTPDLFUMJCTPDLFUSC ઀ଓ଴ػதͷ4PDLFUΦϒδΣΫτ 4PDLFUΦϒδΣΫτΛฦͯ͠"EESJOGPMJTUFOΛऴྃ

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4PDLFUUDQ@TFSWFS@TPDLFUT 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 # ... } # ... end ࠶ͼ ˞if port == 0ͷelseઅͷத "EESJOGPMJTUFO ৽͘͠ιέοτΛ࡞੒ ɹˠࣗ෼ࣗ਎ͷΞυϨεΛඥ෇͚ ɹˠ઀ଓ଴ػΛ։࢝

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4PDLFUUDQ@TFSWFS@TPDLFUT 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 # ... } # ... end "EESJOGPMJTUFOͷฦΓ஋ͱͯ͠ ઀ଓ଴ػΛ։࢝ͨ͠4PDLFUΦϒδΣΫτΛ ഑ྻTPDLFUTʹ֨ೲ ม਺Tʹ֨ೲͨ͠4PDLFUΦϒδΣΫτΛ഑ྻTPDLFUTʹ֨ೲ ˞if port == 0ͷelseઅͷத "EESJOGPMJTUFO ฦΓ஋ͷ4PDLFUΦϒδΣΫτΛม਺Tʹ֨ೲ

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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 # ... } # ... end [#, #] FYUTPDLFUMJCTPDLFUSC "localhost" ͜͜·Ͱͷॲཧ ιέοτͷ࡞੒ɺΞυϨεͷඥ෇͚ɺ ઀ଓ଴ػ։࢝ɺ഑ྻ΁ͷอଘ Λɺ໊લղܾͰऔಘͨ͠ ͢΂ͯͷ"EESJOGPΦϒδΣΫτʹରͯ͠܁Γฦ͢ ˞ྫ ˞ྫ "EESJOGPMJTUFO 4PDLFUUDQ@TFSWFS@TPDLFUT

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4PDLFUUDQ@TFSWFS@TPDLFUT def self.tcp_server_sockets(host=nil, port, &b) if port == 0 sockets = tcp_server_sockets_port0(host) else end if block_given? begin yield sockets ensure sockets.each(&:close) end else sockets end end ઌ΄Ͳ·Ͱͷॲཧ 4PDLFUUDQ@TFSWFS@TPDLFUTϝιουͷଓ͖ "EESJOGPGPSFBDI͕ऴྃͯ͠ɺ if port == 0ͷelseઅΛൈ͚ͨޙ Ҿ͖ଓ͖ ഑ྻTPDLFUTʹ઀ଓ଴ػதͷ4PDLFUΦϒδΣΫτ͕อଘ͞Ε͍ͯΔ FYUTPDLFUMJCTPDLFUSC

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4PDLFUUDQ@TFSWFS@TPDLFUT def self.tcp_server_sockets(host=nil, port, &b) if port == 0 sockets = tcp_server_sockets_port0(host) else end if block_given? begin yield sockets ensure sockets.each(&:close) end else sockets end end ͜ͷϝιουͷݺͼग़࣌͠ʹ౉͞Ε͍ͯͨ ϒϩοΫΛ࣮ߦ͢Δ def self.tcp_server_loop(host=nil, port, &b) tcp_server_sockets(host, port) {|sockets| accept_loop(sockets, &b) } end ઌ΄Ͳ·Ͱͷॲཧ FYUTPDLFUMJCTPDLFUSC ϒϩοΫ

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4PDLFUUDQ@TFSWFS@TPDLFUT def self.tcp_server_sockets(host=nil, port, &b) if port == 0 sockets = tcp_server_sockets_port0(host) else end if block_given? begin yield sockets ensure sockets.each(&:close) end else sockets end end def self.tcp_server_loop(host=nil, port, &b) tcp_server_sockets(host, port) {|sockets| accept_loop(sockets, &b) } end 4PDLFUBDDFQU@MPPQ ઌ΄Ͳ·Ͱͷॲཧ FYUTPDLFUMJCTPDLFUSC

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4PDLFUUDQ@TFSWFS@TPDLFUT def self.tcp_server_sockets(host=nil, port, &b) if port == 0 sockets = tcp_server_sockets_port0(host) else end if block_given? begin yield sockets ensure sockets.each(&:close) end else sockets end end def self.tcp_server_loop(host=nil, port, &b) tcp_server_sockets(host, port) {|sockets| accept_loop(sockets, &b) } end ઀ଓ଴ػதͷ4PDLFUΦϒδΣΫτͷ഑ྻ ઌ΄Ͳ·Ͱͷॲཧ FYUTPDLFUMJCTPDLFUSC

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4PDLFUBDDFQU@MPPQ def self.accept_loop(*sockets) sockets.flatten!(1) if sockets.empty? raise ArgumentError, "no sockets" end loop { readable, _, _ = IO.select(sockets) readable.each {|r| sock, addr = r.accept_nonblock(exception: false) next if sock == :wait_readable yield sock, addr } } end FYUTPDLFUMJCTPDLFUSC

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4PDLFUBDDFQU@MPPQ def self.accept_loop(*sockets) sockets.flatten!(1) if sockets.empty? raise ArgumentError, "no sockets" end loop { readable, _, _ = IO.select(sockets) readable.each {|r| sock, addr = r.accept_nonblock(exception: false) next if sock == :wait_readable yield sock, addr } } end ઀ଓ଴ػதͷ4PDLFUΦϒδΣΫτͷ഑ྻ 4PDLFUBDDFQU@MPPQ͸Ҿ਺ͱͯ͠ ઀ଓ଴ػதͷ4PDLFUΦϒδΣΫτͷ഑ྻΛड͚औΔ FYUTPDLFUMJCTPDLFUSC

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4PDLFUBDDFQU@MPPQ def self.accept_loop(*sockets) sockets.flatten!(1) if sockets.empty? raise ArgumentError, "no sockets" end loop { readable, _, _ = IO.select(sockets) readable.each {|r| sock, addr = r.accept_nonblock(exception: false) next if sock == :wait_readable yield sock, addr } } end ϧʔϓॲཧ FYUTPDLFUMJCTPDLFUSC

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4PDLFUBDDFQU@MPPQ def self.accept_loop(*sockets) sockets.flatten!(1) if sockets.empty? raise ArgumentError, "no sockets" end loop { readable, _, _ = IO.select(sockets) readable.each {|r| sock, addr = r.accept_nonblock(exception: false) next if sock == :wait_readable yield sock, addr } } end ϧʔϓॲཧ αʔό͸ΫϥΠΞϯτ͔ΒԿ౓΋ ϦΫΤετΛड͚ΔͨΊɺ Ұ࿈ͷॲཧΛϧʔϓͯ͠ߦ͍ͬͯΔ FYUTPDLFUMJCTPDLFUSC

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4PDLFUBDDFQU@MPPQ def self.accept_loop(*sockets) sockets.flatten!(1) if sockets.empty? raise ArgumentError, "no sockets" end loop { readable, _, _ = IO.select(sockets) readable.each {|r| sock, addr = r.accept_nonblock(exception: false) next if sock == :wait_readable yield sock, addr } } end *0TFMFDU TPDLFUT઀ଓ଴ػதͷ4PDLFUΦϒδΣΫτͷ഑ྻ *0TFMFDUʹ઀ଓ଴ػதͷ4PDLFUΦϒδΣΫτͷ഑ྻΛ ౉ͯ͠ݺͼग़͢ FYUTPDLFUMJCTPDLFUSC

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4PDLFUBDDFQU@MPPQ def self.accept_loop(*sockets) sockets.flatten!(1) if sockets.empty? raise ArgumentError, "no sockets" end loop { readable, _, _ = IO.select(sockets) readable.each {|r| sock, addr = r.accept_nonblock(exception: false) next if sock == :wait_readable yield sock, addr } } end *0TFMFDU TPDLFUT઀ଓ଴ػதͷ4PDLFUΦϒδΣΫτͷ഑ྻ *0TFMFDU͸ Ҿ਺ʹ౉͍ͯ͠Δ4PDLFUΦϒδΣΫτͷ͍ͣΕ͔ʹ ϦΫΤετ͕ಧ͘·Ͱɺ͜͜ͰॲཧΛϒϩοΫ͢Δ FYUTPDLFUMJCTPDLFUSC

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4PDLFUBDDFQU@MPPQ def self.accept_loop(*sockets) sockets.flatten!(1) if sockets.empty? raise ArgumentError, "no sockets" end loop { readable, _, _ = IO.select(sockets) readable.each {|r| sock, addr = r.accept_nonblock(exception: false) next if sock == :wait_readable yield sock, addr } } end *0TFMFDU TPDLFUT઀ଓ଴ػதͷ4PDLFUΦϒδΣΫτͷ഑ྻ ͍ͣΕ͔ͷ4PDLFUΦϒδΣΫτʹϦΫΤετ͕ಧ͘ͱɺ FYUTPDLFUMJCTPDLFUSC

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4PDLFUBDDFQU@MPPQ def self.accept_loop(*sockets) sockets.flatten!(1) if sockets.empty? raise ArgumentError, "no sockets" end loop { readable, _, _ = IO.select(sockets) readable.each {|r| sock, addr = r.accept_nonblock(exception: false) next if sock == :wait_readable yield sock, addr } } end *0TFMFDUͷฦΓ஋ SFBEBCMFϦΫΤετ͕ಧ͍ͨ4PDLFUΦϒδΣΫτͷ഑ྻ *0TFMFDU͸଴ػΛղআ͠ɺ ର৅ͷ4PDLFUΦϒδΣΫτΛཁૉʹ࣋ͭ ഑ྻSFBEBCMFΛฦ͢ FYUTPDLFUMJCTPDLFUSC

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4PDLFUBDDFQU@MPPQ def self.accept_loop(*sockets) sockets.flatten!(1) if sockets.empty? raise ArgumentError, "no sockets" end loop { readable, _, _ = IO.select(sockets) readable.each {|r| sock, addr = r.accept_nonblock(exception: false) next if sock == :wait_readable yield sock, addr } } end 4PDLFUBDDFQU@OPOCMPDL ϦΫΤετ͕ಧ͍ͨ4PDLFUΦϒδΣΫτʹରͯ͠ ॱʹ4PDLFUBDDFQU@OPOCMPDLϝιουΛݺͼग़͢ ϦΫΤετ͕ಧ͍ͨ4PDLFUΦϒδΣΫτ FYUTPDLFUMJCTPDLFUSC

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4PDLFUBDDFQU@OPOCMPDL def accept_nonblock(exception: true) __accept_nonblock(exception) end FYUTPDLFUMJCTPDLFUSC

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4PDLFUBDDFQU@OPOCMPDL def accept_nonblock(exception: true) __accept_nonblock(exception) end FYUTPDLFUMJCTPDLFUSC 4PDLFU@@BDDFQU@OPOCMPDL

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4PDLFU@@BDDFQU@OPOCMPDL void Init_socket(void) { // ... rb_cSocket = rb_define_class("Socket", rb_cBasicSocket); // ... /* for ext/socket/lib/socket.rb use only: */ rb_define_private_method(rb_cSocket, "__accept_nonblock", sock_accept_nonblock, 1); // ... } FYUTPDLFUTPDLFUD 4PDLFU@@BDDFQU@OPOCMPDL͸$Ͱ࣮૷͞Ε͍ͯΔ TPDLFUSCϑΝΠϧ͔Βݺͼग़ͨ͢Ί͚ͩʹ࣮૷͞Ε͍ͯΔ 4PDLFUΫϥεΛఆٛ 4PDLFU@@BDDFQU@OPOCMPDLΛఆٛ 4PDLFU@@BDDFQU@OPOCMPDLͷ಺෦࣮૷

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static VALUE sock_accept_nonblock(VALUE sock, VALUE ex) { rb_io_t *fptr; VALUE sock2; union_sockaddr buf; struct sockaddr *addr = &buf.addr; socklen_t len = (socklen_t)sizeof buf; GetOpenFile(sock, fptr); sock2 = rsock_s_accept_nonblock(rb_cSocket, ex, fptr, addr, &len); if (SYMBOL_P(sock2)) return sock2; /* :wait_readable */ return rb_assoc_new(sock2, rsock_io_socket_addrinfo(sock2, &buf.addr, len)); } TPDL@BDDFQU@OPOCMPDL 4PDLFU@@BDDFQU@OPOCMPDLͷ࣮ମ FYUTPDLFUTPDLFUD

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static VALUE sock_accept_nonblock(VALUE sock, VALUE ex) { rb_io_t *fptr; VALUE sock2; union_sockaddr buf; struct sockaddr *addr = &buf.addr; socklen_t len = (socklen_t)sizeof buf; GetOpenFile(sock, fptr); sock2 = rsock_s_accept_nonblock(rb_cSocket, ex, fptr, addr, &len); if (SYMBOL_P(sock2)) return sock2; /* :wait_readable */ return rb_assoc_new(sock2, rsock_io_socket_addrinfo(sock2, &buf.addr, len)); } TPDL@BDDFQU@OPOCMPDL 4PDLFU@@BDDFQU@OPOCMPDLͷ࣮ମ FYUTPDLFUTPDLFUD 4PDLFUBDDFQU@OPOCMPDLͷϨγʔό 4PDLFUΦϒδΣΫτ

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static VALUE sock_accept_nonblock(VALUE sock, VALUE ex) { rb_io_t *fptr; VALUE sock2; union_sockaddr buf; struct sockaddr *addr = &buf.addr; socklen_t len = (socklen_t)sizeof buf; GetOpenFile(sock, fptr); sock2 = rsock_s_accept_nonblock(rb_cSocket, ex, fptr, addr, &len); if (SYMBOL_P(sock2)) return sock2; /* :wait_readable */ return rb_assoc_new(sock2, rsock_io_socket_addrinfo(sock2, &buf.addr, len)); } TPDL@BDDFQU@OPOCMPDL 4PDLFU@@BDDFQU@OPOCMPDLͷ࣮ମ FYUTPDLFUTPDLFUD Ϩγʔόͷ4PDLFUΦϒδΣΫτͱ͸ผʹɺ ৽͍͠4PDLFUΦϒδΣΫτΛ֨ೲ͢ΔͨΊͷ ม਺TPDLΛએݴ ͋ͱͰ࢖͏

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static VALUE sock_accept_nonblock(VALUE sock, VALUE ex) { rb_io_t *fptr; VALUE sock2; union_sockaddr buf; struct sockaddr *addr = &buf.addr; socklen_t len = (socklen_t)sizeof buf; GetOpenFile(sock, fptr); sock2 = rsock_s_accept_nonblock(rb_cSocket, ex, fptr, addr, &len); if (SYMBOL_P(sock2)) return sock2; /* :wait_readable */ return rb_assoc_new(sock2, rsock_io_socket_addrinfo(sock2, &buf.addr, len)); } TPDL@BDDFQU@OPOCMPDL 4PDLFU@@BDDFQU@OPOCMPDLͷ࣮ମ FYUTPDLFUTPDLFUD 4PDLFUBDDFQU@OPOCMPDLͷϨγʔό 4PDLFUΦϒδΣΫτ Ϩγʔόͷ4PDLFUΦϒδΣΫτ͔Β ಺෦৘ใΛऔಘͯ͠ม਺GQUSʹอଘ (FU0QFO'JMFϚΫϩ

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static VALUE sock_accept_nonblock(VALUE sock, VALUE ex) { rb_io_t *fptr; VALUE sock2; union_sockaddr buf; struct sockaddr *addr = &buf.addr; socklen_t len = (socklen_t)sizeof buf; GetOpenFile(sock, fptr); sock2 = rsock_s_accept_nonblock(rb_cSocket, ex, fptr, addr, &len); if (SYMBOL_P(sock2)) return sock2; /* :wait_readable */ return rb_assoc_new(sock2, rsock_io_socket_addrinfo(sock2, &buf.addr, len)); } TPDL@BDDFQU@OPOCMPDL 4PDLFU@@BDDFQU@OPOCMPDLͷ࣮ମ STPDL@T@BDDFQU@OPOCMPDLؔ਺ FYUTPDLFUTPDLFUD

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static VALUE sock_accept_nonblock(VALUE sock, VALUE ex) { rb_io_t *fptr; VALUE sock2; union_sockaddr buf; struct sockaddr *addr = &buf.addr; socklen_t len = (socklen_t)sizeof buf; GetOpenFile(sock, fptr); sock2 = rsock_s_accept_nonblock(rb_cSocket, ex, fptr, addr, &len); if (SYMBOL_P(sock2)) return sock2; /* :wait_readable */ return rb_assoc_new(sock2, rsock_io_socket_addrinfo(sock2, &buf.addr, len)); } TPDL@BDDFQU@OPOCMPDL 4PDLFU@@BDDFQU@OPOCMPDLͷ࣮ମ Ϩγʔόͷ4PDLFUΦϒδΣΫτͷ಺෦৘ใ FYUTPDLFUTPDLFUD

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static VALUE sock_accept_nonblock(VALUE sock, VALUE ex) { rb_io_t *fptr; VALUE sock2; union_sockaddr buf; struct sockaddr *addr = &buf.addr; socklen_t len = (socklen_t)sizeof buf; GetOpenFile(sock, fptr); sock2 = rsock_s_accept_nonblock(rb_cSocket, ex, fptr, addr, &len); if (SYMBOL_P(sock2)) return sock2; /* :wait_readable */ return rb_assoc_new(sock2, rsock_io_socket_addrinfo(sock2, &buf.addr, len)); } TPDL@BDDFQU@OPOCMPDL 4PDLFU@@BDDFQU@OPOCMPDLͷ࣮ମ STPDL@T@BDDFQU@OPOCMPDLؔ਺͸ ಺෦ͰDMPFYFD@BDDFQUؔ਺ΛݺΜͰ͍Δ FYUTPDLFUTPDLFUD

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DMPFYFD@BDDFQU static int cloexec_accept(int socket, struct sockaddr *address, socklen_t *address_len) { socklen_t len0 = 0; if (address_len) len0 = *address_len; #ifdef HAVE_ACCEPT4 // ... #else int result = accept(socket, address, ...); if (result == -1) return -1; rb_maygvl_fd_fix_cloexec(result); rsock_make_fd_nonblock(result); #endif if (address_len && len0 < *address_len) *address_len = len0; return result; } FYUTPDLFUJOJUD

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DMPFYFD@BDDFQU static int cloexec_accept(int socket, struct sockaddr *address, socklen_t *address_len) { socklen_t len0 = 0; if (address_len) len0 = *address_len; #ifdef HAVE_ACCEPT4 // ... #else int result = accept(socket, address, ...); if (result == -1) return -1; rb_maygvl_fd_fix_cloexec(result); rsock_make_fd_nonblock(result); #endif if (address_len && len0 < *address_len) *address_len = len0; return result; } FYUTPDLFUJOJUD Ϩγʔόͷ4PDLFUΦϒδΣΫτͷιέοτσΟεΫϦϓλ

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DMPFYFD@BDDFQU static int cloexec_accept(int socket, struct sockaddr *address, socklen_t *address_len) { socklen_t len0 = 0; if (address_len) len0 = *address_len; #ifdef HAVE_ACCEPT4 // ... #else int result = accept(socket, address, ...); if (result == -1) return -1; rb_maygvl_fd_fix_cloexec(result); rsock_make_fd_nonblock(result); #endif if (address_len && len0 < *address_len) *address_len = len0; return result; } DMPFYFD@BDDFQUؔ਺಺ͰγεςϜίʔϧ BDDFQUΛݺͿ BDDFQU γεςϜίʔϧ aॏཁ FYUTPDLFUJOJUD ΫϥΠΞϯτ͔ΒͷϦΫΤετΛ ࢦఆͷιέοτͰड͚ೖΕΔ ˞JGEFG)"7&@"$$&15͕GBMTFͷ৔߹

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DMPFYFD@BDDFQU static int cloexec_accept(int socket, struct sockaddr *address, socklen_t *address_len) { socklen_t len0 = 0; if (address_len) len0 = *address_len; #ifdef HAVE_ACCEPT4 // ... #else int result = accept(socket, address, ...); if (result == -1) return -1; rb_maygvl_fd_fix_cloexec(result); rsock_make_fd_nonblock(result); #endif if (address_len && len0 < *address_len) *address_len = len0; return result; } FYUTPDLFUJOJUD Ҿ਺ʹιέοτσΟεΫϦϓλΛ౉͠ɺ ʮͲͷιέοτͷϦΫΤετΛड͚෇͚Δͷ͔ʯΛࢦఆ Ϩγʔόͷ4PDLFUΦϒδΣΫτͷιέοτσΟεΫϦϓλ

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DMPFYFD@BDDFQU static int cloexec_accept(int socket, struct sockaddr *address, socklen_t *address_len) { socklen_t len0 = 0; if (address_len) len0 = *address_len; #ifdef HAVE_ACCEPT4 // ... #else int result = accept(socket, address, ...); if (result == -1) return -1; rb_maygvl_fd_fix_cloexec(result); rsock_make_fd_nonblock(result); #endif if (address_len && len0 < *address_len) *address_len = len0; return result; } BDDFQU͕ϦΫΤετΛड͚෇͚Δͱ FYUTPDLFUJOJUD ΫϥΠΞϯτ αʔό BDDFQU

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DMPFYFD@BDDFQU static int cloexec_accept(int socket, struct sockaddr *address, socklen_t *address_len) { socklen_t len0 = 0; if (address_len) len0 = *address_len; #ifdef HAVE_ACCEPT4 // ... #else int result = accept(socket, address, ...); if (result == -1) return -1; rb_maygvl_fd_fix_cloexec(result); rsock_make_fd_nonblock(result); #endif if (address_len && len0 < *address_len) *address_len = len0; return result; } ϦΫΤετΛ଴ͪड͚͍ͯΔιέοτ B ͱ͸ผʹ ΫϥΠΞϯτͱ઀ଓ͞Εͨ৽͍͠ιέοτ C ͕࡞੒͞ΕΔ FYUTPDLFUJOJUD ΫϥΠΞϯτ aa઀ଓཱ֬ αʔό C B

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DMPFYFD@BDDFQU static int cloexec_accept(int socket, struct sockaddr *address, socklen_t *address_len) { socklen_t len0 = 0; if (address_len) len0 = *address_len; #ifdef HAVE_ACCEPT4 // ... #else int result = accept(socket, address, ...); if (result == -1) return -1; rb_maygvl_fd_fix_cloexec(result); rsock_make_fd_nonblock(result); #endif if (address_len && len0 < *address_len) *address_len = len0; return result; } ΫϥΠΞϯτͱ઀ଓࡁΈͷιέοτͷ ιέοτσΟεΫϦϓλ BDDFQU͸৽͘͠࡞੒͞Εͨιέοτ C ͷ ιέοτσΟεΫϦϓλΛฦ͢ FYUTPDLFUJOJUD ΫϥΠΞϯτ αʔό C B aa઀ଓཱ֬

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DMPFYFD@BDDFQU static int cloexec_accept(int socket, struct sockaddr *address, socklen_t *address_len) { socklen_t len0 = 0; if (address_len) len0 = *address_len; #ifdef HAVE_ACCEPT4 // ... #else int result = accept(socket, address, ...); if (result == -1) return -1; rb_maygvl_fd_fix_cloexec(result); rsock_make_fd_nonblock(result); #endif if (address_len && len0 < *address_len) *address_len = len0; return result; } DMPFYFD@BDDFQUؔ਺͸৽͘͠࡞੒͞Εͨιέοτ C ͷ ιέοτσΟεΫϦϓλΛฦͯ͠ऴྃ FYUTPDLFUJOJUD ΫϥΠΞϯτ αʔό C B aa઀ଓཱ֬

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static VALUE sock_accept_nonblock(VALUE sock, VALUE ex) { rb_io_t *fptr; VALUE sock2; union_sockaddr buf; struct sockaddr *addr = &buf.addr; socklen_t len = (socklen_t)sizeof buf; GetOpenFile(sock, fptr); sock2 = rsock_s_accept_nonblock(rb_cSocket, ex, fptr, addr, &len); if (SYMBOL_P(sock2)) return sock2; /* :wait_readable */ return rb_assoc_new(sock2, rsock_io_socket_addrinfo(sock2, &buf.addr, len)); } TPDL@BDDFQU@OPOCMPDL 4PDLFU@@BDDFQU@OPOCMPDLͷ࣮ମ FYUTPDLFUTPDLFUD ࠶ͼ STPDL@T@BDDFQU@OPOCMPDLؔ਺ ಺෦ͰDMPFYFD@BDDFQUؔ਺ΛݺͿ

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static VALUE sock_accept_nonblock(VALUE sock, VALUE ex) { rb_io_t *fptr; VALUE sock2; union_sockaddr buf; struct sockaddr *addr = &buf.addr; socklen_t len = (socklen_t)sizeof buf; GetOpenFile(sock, fptr); sock2 = rsock_s_accept_nonblock(rb_cSocket, ex, fptr, addr, &len); if (SYMBOL_P(sock2)) return sock2; /* :wait_readable */ return rb_assoc_new(sock2, rsock_io_socket_addrinfo(sock2, &buf.addr, len)); } FYUTPDLFUTPDLFUD STPDL@T@BDDFQU@OPOCMPDLؔ਺͸ ৽͘͠࡞੒ͨ͠ૉͷιέοτΛ 4PDLFUΦϒδΣΫτʹม׵ͯ͠ฦ͢ TPDL@BDDFQU@OPOCMPDL 4PDLFU@@BDDFQU@OPOCMPDLͷ࣮ମ

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static VALUE sock_accept_nonblock(VALUE sock, VALUE ex) { rb_io_t *fptr; VALUE sock2; union_sockaddr buf; struct sockaddr *addr = &buf.addr; socklen_t len = (socklen_t)sizeof buf; GetOpenFile(sock, fptr); sock2 = rsock_s_accept_nonblock(rb_cSocket, ex, fptr, addr, &len); if (SYMBOL_P(sock2)) return sock2; /* :wait_readable */ return rb_assoc_new(sock2, rsock_io_socket_addrinfo(sock2, &buf.addr, len)); } FYUTPDLFUTPDLFUD ৽͍͠4PDLFUΦϒδΣΫτΛ֨ೲ ৽͍͠4PDLFUΦϒδΣΫτΛ֨ೲ͢ΔͨΊͷม਺TPDLΛએݴ TPDL@BDDFQU@OPOCMPDL 4PDLFU@@BDDFQU@OPOCMPDLͷ࣮ମ STPDL@T@BDDFQU@OPOCMPDLؔ਺͸ ৽͘͠࡞੒ͨ͠ૉͷιέοτΛ 4PDLFUΦϒδΣΫτʹม׵ͯ͠ฦ͢

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static VALUE sock_accept_nonblock(VALUE sock, VALUE ex) { rb_io_t *fptr; VALUE sock2; union_sockaddr buf; struct sockaddr *addr = &buf.addr; socklen_t len = (socklen_t)sizeof buf; GetOpenFile(sock, fptr); sock2 = rsock_s_accept_nonblock(rb_cSocket, ex, fptr, addr, &len); if (SYMBOL_P(sock2)) return sock2; /* :wait_readable */ return rb_assoc_new(sock2, rsock_io_socket_addrinfo(sock2, &buf.addr, len)); } FYUTPDLFUTPDLFUD TPDL@BDDFQU@OPOCMPDL 4PDLFU@@BDDFQU@OPOCMPDLͷ࣮ମ 4PDLFUΦϒδΣΫτͱ઀ଓઌΞυϨεΛද͢"EESJOGPΦϒδΣΫτΛ഑ྻʹͯ͠ฦ͢

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static VALUE sock_accept_nonblock(VALUE sock, VALUE ex) { rb_io_t *fptr; VALUE sock2; union_sockaddr buf; struct sockaddr *addr = &buf.addr; socklen_t len = (socklen_t)sizeof buf; GetOpenFile(sock, fptr); sock2 = rsock_s_accept_nonblock(rb_cSocket, ex, fptr, addr, &len); if (SYMBOL_P(sock2)) return sock2; /* :wait_readable */ return rb_assoc_new(sock2, rsock_io_socket_addrinfo(sock2, &buf.addr, len)); } FYUTPDLFUTPDLFUD TPDL@BDDFQU@OPOCMPDL 4PDLFU@@BDDFQU@OPOCMPDLͷ࣮ମ 4PDLFU@@BDDFQU@OPOCMPDLͷ಺෦࣮૷͸͜͜·Ͱ

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4PDLFUBDDFQU@MPPQ ࠶ͼ def self.accept_loop(*sockets) # ... loop { readable, _, _ = IO.select(sockets) readable.each {|r| sock, addr = r.accept_nonblock(exception: false) next if sock == :wait_readable yield sock, addr } } end 4PDLFUBDDFQU@OPOCMPDL ઀ଓΛड͚෇͚Δ

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def self.accept_loop(*sockets) # ... loop { readable, _, _ = IO.select(sockets) readable.each {|r| sock, addr = r.accept_nonblock(exception: false) next if sock == :wait_readable yield sock, addr } } end 4PDLFUBDDFQU@MPPQ 4PDLFUBDDFQU@OPOCMPDLͷฦΓ஋͔Β ม਺TPDLʹΫϥΠΞϯτͱ઀ଓࡁΈͷ ৽͍͠4PDLFUΦϒδΣΫτΛ֨ೲ 4PDLFUBDDFQU@OPOCMPDL ઀ଓΛड͚෇͚Δ

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def self.accept_loop(*sockets) # ... loop { readable, _, _ = IO.select(sockets) readable.each {|r| sock, addr = r.accept_nonblock(exception: false) next if sock == :wait_readable yield sock, addr } } end Socket.tcp_server_loop(...) do |sock| message = sock.readpartial 100 sock.write message ensure sock.close end 4PDLFUBDDFQU@MPPQ ઀ଓࡁΈͷ4PDLFUΦϒδΣΫτΛ࢖ͬͯϒϩοΫΛ࣮ߦ

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4PDLFUBDDFQU@MPPQ def self.accept_loop(*sockets) # ... loop { readable, _, _ = IO.select(sockets) readable.each {|r| sock, addr = r.accept_nonblock(exception: false) next if sock == :wait_readable yield sock, addr } } end ઀ଓࡁΈͷ4PDLFUΦϒδΣΫτΛ࢖ͬͯϒϩοΫΛ࣮ߦ aΰʔϧ Socket.tcp_server_loop(...) do |sock| message = sock.readpartial 100 sock.write message ensure sock.close end

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4PDLFUUDQ@TFSWFS@MPPQͷ͘͠Έ αʔό Socket.tcp_server_loop Λ࣮ߦ

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4PDLFUUDQ@TFSWFS@MPPQͷ͘͠Έ αʔό Socket.tcp_server_loop 1. Addrinfo.getaddrinfo Λ࣮ߦ ϗετ໊Λ*1ΞυϨεʹղܾ͢Δ ΞυϨε৘ใΛ"EESJOGPΦϒδΣΫτͯ͠ѻ͑ΔΑ͏ʹ͢Δ

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4PDLFUUDQ@TFSWFS@MPPQͷ͘͠Έ αʔό Socket.tcp_server_loop 2. Socket.new (Socket#initialize) socket Λ࣮ߦ ϗετ಺ʹιέοτΛ࡞੒͢Δ ιέοτΛ4PLDFUΦϒδΣΫτͯ͠ѻ͑ΔΑ͏ʹ͢Δ ➡︎

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4PDLFUUDQ@TFSWFS@MPPQͷ͘͠Έ αʔό Socket.tcp_server_loop 3. Socket#bind bind Λ࣮ߦ ࡞੒ͨ͠ιέοτͱղܾͨࣗ͠਎ͷΞυϨεΛඥ͚ͮΔ ➡︎

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4PDLFUUDQ@TFSWFS@MPPQͷ͘͠Έ αʔό Socket.tcp_server_loop 4. Socket#listen listen Λ࣮ߦ ΞυϨεͱඥ͚ͮͨιέοτͰ઀ଓΛ଴ػ͢Δ ➡︎

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4PDLFUUDQ@TFSWFS@MPPQͷ͘͠Έ αʔό Socket.tcp_server_loop 5. Socket#accept_nonblock accept Λ࣮ߦ ιέοτʹಧ͍ͨϦΫΤετΛड͚෇͚Δ ΫϥΠΞϯτͱ઀ଓࡁΈͷ4PDLFUΦϒδΣΫτΛฦ͢ ➡︎

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αʔό Socket.tcp_server_loop 6. Λ࣮ߦ ϒϩοΫΛ࣮ߦ 4PDLFUUDQ@TFSWFS@MPPQͷ͘͠Έ aΰʔϧ ͜ͷ4PDLFUΦϒδΣΫτ͔Β ϦΫΤετϝοηʔδΛಡΈࠐΜͩΓ ड৴ ϨεϙϯεϝοηʔδΛॻ͖ࠐΜͩΓ ૹ৴ ͢Δ

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·ͱΊ ɹ

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·ͱΊ ͨͩͷײ૝ ɹ ιέοτ͓ͬͯ΋͠Ζ͍

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ιέοτ͓ͬͯ΋͠Ζ͍ ιέοτϓϩάϥϛϯά ιέοτΛ࢖༻ͯ͠ωοτϫʔΫ্Ͱσʔλͷૹड৴Λ͢Δ͜ͱ

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ιέοτ͓ͬͯ΋͠Ζ͍ ΫϥΠΞϯτͱαʔόɺͦΕͧΕ͕Ұ࿈ͷखଓ͖ʹԊͬͯ ιέοτ"1*Λૢ࡞͢Δ͜ͱʹΑͬͯɺ ΫϥΠΞϯτ αʔό ιέοτ ɾ ɾ ɾ ɾ γεςϜίʔϧ γεςϜίʔϧ γεςϜίʔϧ γεςϜίʔϧ ɾ ɾ γεςϜίʔϧ γεςϜίʔϧ socket connect socket bind listen accept ˞5$1ͷ৔߹

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ιέοτ͓ͬͯ΋͠Ζ͍ ιέοτΛ௨ͯ͡ɺωοτϫʔΫͷ྆୺ʹ͍Δϗετಉ࢜Ͱ ίϛϡχέʔγϣϯΛऔΔ͜ͱ͕Ͱ͖Δ ΫϥΠΞϯτ αʔό Ϩεϙϯε ϦΫΤετ ɾ ɾ ɾ ɾ γεςϜίʔϧ γεςϜίʔϧ γεςϜίʔϧ γεςϜίʔϧ ɾ ɾ γεςϜίʔϧ γεςϜίʔϧ socket connect socket bind listen accept ˞5$1ͷ৔߹

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ιέοτ͓ͬͯ΋͠Ζ͍ ͜ͷͱ͖ιέοτ͸ Θͨͨͪ͠ϓϩάϥϚʔʹͱͬͯ ωοτϫʔΫͷੈքΛ։͍ͯ͘ΕΔɺ ͦͯࣗ͠෼ͨͪͰϓϩάϥϛϯάͰ͖Δ Ұ൪਎ۙͳଘࡏ

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΋͏ͻͱͭ ɹ

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΋͏ͻͱͭ ɹ 3VCZ͓ͬͯ΋͠Ζ͍

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4PDLFUUDQ4PDLFUUDQ@TFSWFS@MPPQͷେ෦෼͸3VCZ࣮૷ 3VCZ͓ͬͯ΋͠Ζ͍ Socket.tcp_server_loop Socket.tcp_server_sockets Addrinfo.foreach Addrinfo.getaddrinfo Addrinfo#listen Socket.new Socket#bind Socket#listen Socket.accept_loop Socket#accept_nonblock Socket.tcp Socket.tcp_without_fast_fallback Addrinfo.foreach Addrinfo.getaddrinfo Addrinfo.connect Addrinfo.connect_internal Socket.new Socket#cennect ͷίʔϧελοΫ ͷίʔϧελοΫ

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4PDLFUUDQ4PDLFUUDQ@TFSWFS@MPPQͷେ෦෼͸3VCZ࣮૷ ͜ΕΒͷ࣮૷ࣗମ͕3VCZΛ࢖ͬͨιέοτϓϩάϥϛϯά 3VCZ͓ͬͯ΋͠Ζ͍ Socket.tcp_server_loop Socket.tcp_server_sockets Addrinfo.foreach Addrinfo.getaddrinfo Addrinfo#listen Socket.new Socket#bind Socket#listen Socket.accept_loop Socket#accept_nonblock Socket.tcp Socket.tcp_without_fast_fallback Addrinfo.foreach Addrinfo.getaddrinfo Addrinfo.connect Addrinfo.connect_internal Socket.new Socket#cennect ͷίʔϧελοΫ ͷίʔϧελοΫ

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͜ͷͱ͖ιέοτΛ௚઀ૢ࡞͢Δ෦෼͸ɺ࣮ࡍ͸ 3VCZͷ಺෦Ͱ͸$Ͱ࣮૷͞Ε͍ͯΔ Socket.tcp_server_loop Socket.tcp_server_sockets Addrinfo.foreach Addrinfo.getaddrinfo Addrinfo#listen Socket.new Socket#bind Socket#listen Socket.accept_loop Socket#accept_nonblock Socket.tcp Socket.tcp_without_fast_fallback Addrinfo.foreach Addrinfo.getaddrinfo Addrinfo.connect Addrinfo.connect_internal Socket.new Socket#cennect 3VCZ͓ͬͯ΋͠Ζ͍ ͷίʔϧελοΫ $࣮૷ $࣮૷ $࣮૷ $࣮૷ $࣮૷ $࣮૷ ͷίʔϧελοΫ

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ͦΕΒ͸3VCZͷίʔυͷதͰ͸ 4PDLFUΦϒδΣΫτ΁ͷϝιουݺͼग़͠ͱͯ͠දݱ͞ΕΔ 3VCZ͓ͬͯ΋͠Ζ͍ Socket.tcp Socket.tcp_without_fast_fallback Addrinfo.foreach Addrinfo.getaddrinfo Addrinfo.connect Addrinfo.connect_internal Socket.new Socket#cennect ͷίʔϧελοΫ $࣮૷ $࣮૷ Socket.tcp_server_loop Socket.tcp_server_sockets Addrinfo.foreach Addrinfo.getaddrinfo Addrinfo#listen Socket.new Socket#bind Socket#listen Socket.accept_loop Socket#accept_nonblock $࣮૷ $࣮૷ $࣮૷ $࣮૷ ͷίʔϧελοΫ

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೉͍͜͠ͱ͸͢΂ͯ3VCZࣗ਎ͷதʹӅ͞Ε͍ͯΔ Θͨͨͪ͠͸ιέοτΛ ;ͭ͏ͷ3VCZΦϒδΣΫτͱͯ͠ѻ͏͜ͱ͕Ͱ͖Δ 3VCZ͓ͬͯ΋͠Ζ͍ Socket.new socket Socket#connect connect Socket#bind bind Socket#listen listen Socket#accept_nonblock accept ɾ ɾ ɾ ɾ ɾ ➡︎ ➡︎ ➡︎ ➡︎ ➡︎ γεςϜίʔϧ γεςϜίʔϧ γεςϜίʔϧ γεςϜίʔϧ γεςϜίʔϧ

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3VCZ͓ͬͯ΋͠Ζ͍ ͜Εͬͯཁ͢Δʹ;ͭ͏ͷ3VCZϓϩάϥϛϯά

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͜Εͬͯཁ͢Δʹ;ͭ͏ͷ3VCZϓϩάϥϛϯά 3VCZ͓ͬͯ΋͠Ζ͍ IUUQTUBOPTIJJSVCZHJUIVCJP ͦͯ͠3VCZϓϩάϥϛϯά͸ͨͷ͍͠

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3VCZΛ࢖ͬͯ3VCZͷΑ͏ʹ ιέοτΛѻ͑͹ ιέοτϓϩάϥϛϯά͸ 3VCZϓϩάϥϛϯάͱಉ͡Α͏ʹ ͨͷ͍͠

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͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ ࢀߟਤॻ ɾ83JDIBSE4UFWFOT ࣰాཅҰ ຋༁ ɹʮ6/*9ωοτϫʔΫϓϩάϥϛϯά7PMୈ൛ ɹωοτϫʔΫ"1*ιέοτͱ95*ʯ ͨͷ͍͠4PDLFUͷ͘͠Έ Socket Under a Microscope