JFIFXX    $.' ",#(7),01444'9=82<.342  2!!22222222222222222222222222222222222222222222222222"4 ,PG"Z_4˷kjزZ,F+_z,© zh6٨icfu#ډb_N?wQ5-~I8TK<5oIv-k_U_~bMdӜUHh?]EwQk{_}qFW7HTՑYF?_'ϔ_Ջt=||I 6έ"D/[k9Y8ds|\Ҿp6Ҵ].6znopM[mei$[soᘨ˸ nɜG-ĨUycP3.DBli;hjx7Z^NhN3u{:jx힞#M&jL P@_ P&o89@Sz6t7#Oߋ s}YfTlmrZ)'Nk۞pw\Tȯ?8`Oi{wﭹW[r Q4F׊3m&L=h3z~#\l :F,j@ ʱwQT8"kJO6֚l}R>ډK]y&p}b;N1mr$|7>e@BTM*-iHgD) Em|ؘbҗaҾt4oG*oCNrPQ@z,|?W[0:n,jWiEW$~/hp\?{(0+Y8rΟ+>S-SVN;}s?. w9˟<Mq4Wv'{)01mBVW[8/< %wT^5b)iM pgN&ݝVO~qu9 !J27$O-! :%H ـyΠM=t{!S oK8txA& j0 vF Y|y ~6@c1vOpIg4lODL Rcj_uX63?nkWyf;^*B @~a`Eu+6L.ü>}y}_O6͐:YrGXkGl^w~㒶syIu! W XN7BVO!X2wvGRfT#t/?%8^WaTGcLMI(J1~8?aT ]ASE(*E} 2#I/׍qz^t̔bYz4xt){ OH+(EA&NXTo"XC')}Jzp ~5}^+6wcQ|LpdH}(.|kc4^"Z?ȕ a<L!039C EuCFEwç ;n?*oB8bʝ'#RqfM}7]s2tcS{\icTx;\7KPʇ Z O-~c>"?PEO8@8GQgaՎ󁶠䧘_%#r>1zaebqcPѵn#L =׀t L7`VA{C:ge@w1 Xp3c3ġpM"'-@n4fGB3DJ8[JoߐgK)ƛ$ 83+ 6ʻ SkI*KZlT _`?KQKdB`s}>`*>,*@JdoF*弝O}ks]yߘc1GV<=776qPTtXԀ!9*44Tހ3XΛex46YD  BdemDa\_l,G/֌7Y](xTt^%GE4}bTڹ;Y)BQu>J/J ⮶.XԄjݳ+Ed r5_D1 o Bx΢#<W8R6@gM. drD>(otU@x=~v2 ӣdoBd3eO6㣷ݜ66YQz`S{\P~z m5{J/L1xO\ZFu>ck#&:`$ai>2ΔloF[hlEܺΠk:)` $[69kOw\|8}ބ:񶐕IA1/=2[,!.}gN#ub ~݊}34qdELc$"[qU硬g^%B zrpJru%v\h1Yne`ǥ:gpQM~^Xi `S:V29.PV?Bk AEvw%_9CQwKekPؠ\;Io d{ ߞoc1eP\ `E=@KIRYK2NPlLɀ)&eB+ь( JTx_?EZ }@ 6U뙢طzdWIn` D噥[uV"G&Ú2g}&m?ċ"Om# {ON"SXNeysQ@FnVgdX~nj]J58up~.`r\O,ư0oS _Ml4kv\JSdxSW<AeIX$Iw:Sy›R9Q[,5;@]%u@ *rolbI  +%m:͇ZVủθau,RW33 dJeTYE.Mϧ-oj3+yy^cVO9NV\nd1 !͕_)av;թMlWR1)ElP;yوÏu 3k5Pr6<⒲l!˞*u־n!l:UNW %Chx8vL'X@*)̮ˍ D-M+JUkvK+x8cY?Ԡ~3mo|u@[XeYC\Kpx8oCC&N~3-H MXsu<`~"WL$8ξ3a)|:@m\^`@ҷ)5p+6p%i)P Mngc#0AruzRL+xSS?ʮ}()#tmˇ!0}}y$6Lt;$ʳ{^6{v6ķܰgVcnn ~zx«,2u?cE+ȘH؎%Za)X>uWTzNyosFQƤ$*&LLXL)1" LeOɟ9=:tZcŽY?ӭVwv~,Yrۗ|yGaFC.+ v1fήJ]STBn5sW}y$~z'c 8  ,! pVNSNNqy8z˱A4*'2n<s^ǧ˭PJޮɏUGLJ*#i}K%,)[z21z ?Nin1?TIR#m-1lA`fT5+ܐcq՝ʐ,3f2Uեmab#ŠdQy>\)SLYw#.ʑf ,"+w~N'cO3FN<)j&,- љ֊_zSTǦw>?nU仆Ve0$CdrP m׈eXmVu L.bֹ [Դaզ*\y8Է:Ez\0KqC b̘cөQ=0YsNS.3.Oo:#v7[#߫ 5܎LEr49nCOWlG^0k%;YߝZǓ:S#|}y,/kLd TA(AI$+I3;Y*Z}|ӧOdv..#:nf>>ȶITX 8y"dR|)0=n46ⲑ+ra ~]R̲c?6(q;5% |uj~z8R=XIV=|{vGj\gcqz؋%Mߍ1y#@f^^>N#x#۹6Y~?dfPO{P4Vu1E1J *|%JN`eWuzk M6q t[ gGvWIGu_ft5j"Y:Tɐ*; e54q$C2d} _SL#mYpO.C;cHi#֩%+) ӍƲVSYźg |tj38r|V1#;.SQA[S#`n+$$I P\[@s(EDzP])8G#0B[ىXIIq<9~[Z멜Z⊔IWU&A>P~#dp]9 "cP Md?٥Ifتuk/F9c*9Ǎ:ØFzn*@|Iށ9N3{'['ͬҲ4#}!V Fu,,mTIkv C7vB6kT91*l '~ƞFlU'M ][ΩũJ_{iIn$L jOdxkza۪#EClx˘oVɞljr)/,߬hL#^Lф,íMƁe̩NBLiLq}(q6IçJ$WE$:=#(KBzђ xlx?>Պ+>W,Ly!_DŌlQ![ SJ1ƐY}b,+Loxɓ)=yoh@꥟/Iѭ=Py9 ۍYӘe+pJnϱ?V\SO%(t =?MR[Șd/ nlB7j !;ӥ/[-A>dNsLj ,ɪv=1c.SQO3UƀܽE̻9GϷD7(}Ävӌ\y_0[w <΍>a_[0+LF.޺f>oNTq;y\bՃyjH<|q-eɏ_?_9+PHp$[uxK wMwNی'$Y2=qKBP~Yul:[<F12O5=d]Ysw:ϮEj,_QXz`H1,#II dwrP˂@ZJVy$\y{}^~[:NߌUOdؾe${p>G3cĖlʌ ת[`ϱ-WdgIig2 }s ؤ(%#sS@~3XnRG~\jc3vӍLM[JBTs3}jNʖW;7ç?=XF=-=qߚ#='c7ڑWI(O+=:uxqe2zi+kuGR0&eniT^J~\jyp'dtGsO39* b#Ɋ p[BwsT>d4ۧsnvnU_~,vƜJ1s QIz)(lv8MU=;56Gs#KMP=LvyGd}VwWBF'à ?MHUg2 !p7Qjڴ=ju JnA suMeƆҔ!)'8Ϣٔޝ(Vpצ֖d=ICJǠ{qkԭ߸i@Ku|p=..*+xz[Aqġ#s2aƊRR)*HRsi~a &fMP-KL@ZXy'x{}Zm+:)) IJ-iu ܒH'L(7yGӜq j 6ߌg1go,kرtY?W,pefOQS!K۟cҒA|սj>=⬒˧L[ ߿2JaB~Ru:Q] 0H~]7ƼI(}cq 'ήETq?fabӥvr )o-Q_'ᴎoK;Vo%~OK *bf:-ťIR`B5!RB@ï u ̯e\_U_ gES3QTaxU<~c?*#]MW,[8Oax]1bC|踤Plw5V%){t<d50iXSUm:Z┵i"1^B-PhJ&)O*DcWvM)}Pܗ-q\mmζZ-l@}aE6F@&Sg@ݚM ȹ 4#p\HdYDoH"\..RBHz_/5˘6KhJRPmƶim3,#ccoqa)*PtRmk7xDE\Y閣_X<~)c[[BP6YqS0%_;Àv~| VS؇ 'O0F0\U-d@7SJ*z3nyPOm~P3|Yʉr#CSN@ ƮRN)r"C:: #qbY. 6[2K2uǦHYRQMV G$Q+.>nNHq^ qmMVD+-#*U̒ p욳u:IBmPV@Or[b= 1UE_NmyKbNOU}the`|6֮P>\2PVIDiPO;9rmAHGWS]J*_G+kP2KaZH'KxWMZ%OYDRc+o?qGhmdSoh\D|:WUAQc yTq~^H/#pCZTI1ӏT4"ČZ}`w#*,ʹ 0i課Om*da^gJ݅{le9uF#Tֲ̲ٞC"qߍ ոޑo#XZTp@ o8(jdxw],f`~|,s^f1t|m򸄭/ctr5s79Q4H1꠲BB@l9@C+wpxu£Yc9?`@#omHs2)=2.ljg9$YS%*LRY7Z,*=䷘$armoϰUW.|rufIGwtZwo~5 YյhO+=8fF)W7L9lM̘·Y֘YLf큹pRF99.A "wz=E\Z'a 2Ǚ#;'}G*l^"q+2FQ hjkŦ${ޮ-T٭cf|3#~RJt$b(R(rdx >U b&9,>%E\ Άe$'q't*אެb-|dSBOO$R+H)܎K1m`;J2Y~9Og8=vqD`K[F)k[1m޼cn]skz$@)!I x՝"v9=ZA=`Ɠi :E)`7vI}dYI_ o:obo 3Q&D&2= Ά;>hy.*ⅥSӬ+q&j|UƧ}J0WW< ۋS)jQRjƯrN)Gű4Ѷ(S)Ǣ8iW52No˓ ۍ%5brOnL;n\G=^UdI8$&h'+(cȁ߫klS^cƗjԌEꭔgFȒ@}O*;evWVYJ\]X'5ղkFb 6Ro՜mi Ni>J?lPmU}>_Z&KKqrIDՉ~q3fL:Se>E-G{L6pe,8QIhaXaUA'ʂs+טIjP-y8ۈZ?J$WP Rs]|l(ԓsƊio(S0Y 8T97.WiLc~dxcE|2!XKƘਫ਼$((6~|d9u+qd^389Y6L.I?iIq9)O/뚅OXXVZF[یgQLK1RҖr@v#XlFНyS87kF!AsM^rkpjPDyS$Nqnxҍ!Uf!ehi2m`YI9r6 TFC}/y^Η5d'9A-J>{_l+`A['յϛ#w:݅%X}&PStQ"-\縵/$ƗhXb*yBS;Wջ_mcvt?2}1;qSdd~u:2k52R~z+|HE!)Ǟl7`0<,2*Hl-x^'_TVgZA'j ^2ΪN7t?w x1fIzC-ȖK^q;-WDvT78Z hK(P:Q- 8nZ܃e貾<1YT<,"6{/ ?͟|1:#gW>$dJdB=jf[%rE^il:BxSּ1հ,=*7 fcG#q eh?27,!7x6nLC4x},GeǝtC.vS F43zz\;QYC,6~;RYS/6|25vTimlv& nRh^ejRLGf? ۉҬܦƩ|Ȱ>3!viʯ>vオX3e_1zKȗ\qHS,EW[㺨uch⍸O}a>q6n6N6qN ! 1AQaq0@"2BRb#Pr3C`Scst$4D%Td ?Na3mCwxAmqmm$4n淿t'C"wzU=D\R+wp+YT&պ@ƃ3ޯ?AﶂaŘ@-Q=9Dռѻ@MVP܅G5fY6# ?0UQ,IX(6ڵ[DIMNލc&υj\XR|,4 jThAe^db#$]wOӪ1y%LYm뭛CUƃߜ}Cy1XνmF8jI]HۺиE@Ii;r8ӭVFՇ| &?3|xBMuSGe=Ӕ#BE5GY!z_eqр/W>|-Ci߇t1ޯќdR3ug=0 5[?#͏qcfH{ ?u=??ǯ}ZzhmΔBFTWPxs}G93 )gGR<>r h$'nchPBjJҧH -N1N?~}-q!=_2hcMlvY%UE@|vM2.Y[|y"EïKZF,ɯ?,q?vM 80jx";9vk+ ֧ ȺU?%vcVmA6Qg^MA}3nl QRNl8kkn'(M7m9وq%ޟ*h$Zk"$9: ?U8Sl,,|ɒxH(ѷGn/Q4PG%Ա8N! &7;eKM749R/%lc>x;>C:th?aKXbheᜋ^$Iհ hr7%F$EFdt5+(M6tÜUU|zW=aTsTgdqPQb'm1{|YXNb P~F^F:k6"j! Ir`1&-$Bevk:y#ywI0x=D4tUPZHڠ底taP6b>xaQ# WeFŮNjpJ* mQN*I-*ȩFg3 5Vʊɮa5FO@{NX?H]31Ri_uѕ 0 F~:60p͈SqX#a5>`o&+<2D: ڝ$nP*)N|yEjF5ټeihyZ >kbHavh-#!Po=@k̆IEN@}Ll?jO߭ʞQ|A07xwt!xfI2?Z<ץTcUj]陎Ltl }5ϓ$,Omˊ;@OjEj(ا,LXLOЦ90O .anA7j4 W_ٓzWjcBy՗+EM)dNg6y1_xp$Lv:9"zpʙ$^JԼ*ϭo=xLj6Ju82AH3$ٕ@=Vv]'qEz;I˼)=ɯx /W(Vp$ mu񶤑OqˎTr㠚xsrGCbypG1ߠw e8$⿄/M{*}W]˷.CK\ުx/$WPwr |i&}{X >$-l?-zglΆ(FhvS*b߲ڡn,|)mrH[a3ר[13o_U3TC$(=)0kgP u^=4 WYCҸ:vQרXàtkm,t*^,}D* "(I9R>``[~Q]#afi6l86:,ssN6j"A4IuQ6E,GnHzSHOuk5$I4ؤQ9@CwpBGv[]uOv0I4\yQѸ~>Z8Taqޣ;za/SI:ܫ_|>=Z8:SUIJ"IY8%b8H:QO6;7ISJҌAά3>cE+&jf$eC+z;V rʺmyeaQf&6ND.:NTvm<- uǝ\MvZYNNT-A>jr!SnO 13Ns%3D@`ܟ 1^c< aɽ̲Xë#w|ycW=9I*H8p^(4՗karOcWtO\ƍR8'KIQ?5>[}yUײ -h=% qThG2)"ו3]!kB*pFDlA,eEiHfPs5H:Փ~H0DتDIhF3c2E9H5zԑʚiX=:mxghd(v׊9iSOd@0ڽ:p5h-t&Xqӕ,ie|7A2O%PEhtjY1wЃ!  ࢽMy7\a@ţJ 4ȻF@o̒?4wx)]P~u57X 9^ܩU;Iꭆ 5 eK27({|Y׎ V\"Z1 Z}(Ǝ"1S_vE30>p; ΝD%xW?W?vo^Vidr[/&>~`9Why;R ;;ɮT?r$g1KACcKl:'3 cﳯ*"t8~l)m+U,z`(>yJ?h>]vЍG*{`;y]IT ;cNUfo¾h/$|NS1S"HVT4uhǜ]v;5͠x'C\SBplh}N ABx%ޭl/Twʽ]D=Kžr㻠l4SO?=k M: cCa#ha)ѐxcsgPiG{+xQI= zԫ+ 8"kñj=|c yCF/*9жh{ ?4o kmQNx;Y4膚aw?6>e]Qr:g,i"ԩA*M7qB?ӕFhV25r[7 Y }LR}*sg+xr2U=*'WSZDW]WǞ<叓{$9Ou4y90-1'*D`c^o?(9uݐ'PI& fJݮ:wSjfP1F:X H9dԯ˝[_54 }*;@ܨ ðynT?ןd#4rGͨH1|-#MrS3G3).᧏3vz֑r$G"`j 1tx0<ƆWh6y6,œGagAyb)hDß_mü gG;evݝnQ C-*oyaMI><]obD":GA-\%LT8c)+y76oQ#*{(F⽕y=rW\p۩cA^e6KʐcVf5$'->ՉN"F"UQ@fGb~#&M=8טJNu9D[̤so~ G9TtW^g5y$bY'سǴ=U-2 #MCt(i lj@Q 5̣i*OsxKf}\M{EV{υƇ);HIfeLȣr2>WIȂ6ik 5YOxȺ>Yf5'|H+98pjn.OyjY~iw'l;s2Y:'lgꥴ)o#'SaaKZ m}`169n"xI *+ }FP"l45'ZgE8?[X7(.Q-*ތL@̲v.5[=t\+CNܛ,gSQnH}*FG16&:t4ُ"Ạ$b |#rsaT ]ӽDP7ո0y)e$ٕvIh'QEAm*HRI=: 4牢) %_iNݧl] NtGHL ɱg<1V,J~ٹ"KQ 9HS9?@kr;we݁]I!{ @G["`J:n]{cAEVʆ#U96j#Ym\qe4hB7Cdv\MNgmAyQL4uLjj9#44tl^}LnR!t±]rh6ٍ>yҏNfU  Fm@8}/ujb9he:AyծwGpΧh5l}3p468)Udc;Us/֔YX1O2uqs`hwgr~{ RmhN؎*q 42*th>#E#HvOq}6e\,Wk#Xb>p}դ3T5†6[@Py*n|'f֧>lư΂̺SU'*qp_SM 'c6m ySʨ;MrƋmKxo,GmPAG:iw9}M(^V$ǒѽ9| aJSQarB;}ٻ֢2%Uc#gNaݕ'v[OY'3L3;,p]@S{lsX'cjwk'a.}}& dP*bK=ɍ!;3ngΊUߴmt'*{,=SzfD Ako~Gaoq_mi}#mPXhύmxǍ΂巿zfQc|kc?WY$_Lvl߶c`?ljݲˏ!V6UЂ(A4y)HpZ_x>eR$/`^'3qˏ-&Q=?CFVR DfV9{8gnh(P"6[D< E~0<@`G6Hгcc cK.5DdB`?XQ2ٿyqo&+1^ DW0ꊩG#QnL3c/x 11[yxპCWCcUĨ80me4.{muI=f0QRls9f9~fǨa"@8ȁQ#cicG$Gr/$W(WV"m7[mAmboD j۳ l^kh׽ # iXnveTka^Y4BNĕ0 !01@Q"2AaPq3BR?@4QT3,㺠W[=JKϞ2r^7vc:9 EߴwS#dIxu:Hp9E! V 2;73|F9Y*ʬFDu&y؟^EAA(ɩ^GV:ݜDy`Jr29ܾ㝉[E;FzxYGUeYC v-txIsםĘqEb+P\ :>iC';k|zرny]#ǿbQw(r|ӹs[D2v-%@;8<a[\o[ϧwI!*0krs)[J9^ʜp1) "/_>o<1AEy^C`x1'ܣnps`lfQ):lb>MejH^?kl3(z:1ŠK&?Q~{ٺhy/[V|6}KbXmn[-75q94dmc^h X5G-}دBޟ |rtMV+]c?-#ڛ^ǂ}LkrOu>-Dry D?:ޞUǜ7V?瓮"#rչģVR;n/_ ؉vݶe5db9/O009G5nWJpA*r9>1.[tsFnQ V 77R]ɫ8_0<՜IFu(v4Fk3E)N:yڮeP`1}$WSJSQNjٺ޵#lј(5=5lǏmoWv-1v,Wmn߀$x_DȬ0¤#QR[Vkzmw"9ZG7'[=Qj8R?zf\a=OU*oBA|G254 p.w7  &ξxGHp B%$gtЏ򤵍zHNuЯ-'40;_3 !01"@AQa2Pq#3BR?ʩcaen^8F<7;EA{EÖ1U/#d1an.1ě0ʾRh|RAo3m3 % 28Q yφHTo7lW>#i`qca m,B-j݋'mR1Ήt>Vps0IbIC.1Rea]H64B>o]($Bma!=?B KǾ+Ծ"nK*+[T#{EJSQs5:U\wĐf3܆&)IԆwE TlrTf6Q|Rh:[K zc֧GC%\_a84HcObiؖV7H )*ģK~Xhչ04?0 E<}3#u? |gS6ꊤ|I#Hڛ աwX97Ŀ%SLy6č|Fa 8b$sקhb9RAu7˨pČ_\*w묦F 4D~f|("mNKiS>$d7SlA/²SL|6N}S˯g]6; #. 403WebShell
403Webshell
Server IP : 43.205.77.33  /  Your IP : 216.73.216.140
Web Server : Apache
System : Linux 43-205-77-33.cprapid.com 3.10.0-1160.119.1.el7.tuxcare.els13.x86_64 #1 SMP Fri Nov 22 06:29:45 UTC 2024 x86_64
User : ksclnmuac ( 1023)
PHP Version : 8.0.30
Disable Function : NONE
MySQL : OFF  |  cURL : ON  |  WGET : ON  |  Perl : ON  |  Python : ON  |  Sudo : ON  |  Pkexec : ON
Directory :  /lib64/python3.6/

Upload File :
current_dir [ Writeable ] document_root [ Writeable ]

 

Command :


[ Back ]     

Current File : /lib64/python3.6/selectors.py
"""Selectors module.

This module allows high-level and efficient I/O multiplexing, built upon the
`select` module primitives.
"""


from abc import ABCMeta, abstractmethod
from collections import namedtuple, Mapping
import math
import select
import sys


# generic events, that must be mapped to implementation-specific ones
EVENT_READ = (1 << 0)
EVENT_WRITE = (1 << 1)


def _fileobj_to_fd(fileobj):
    """Return a file descriptor from a file object.

    Parameters:
    fileobj -- file object or file descriptor

    Returns:
    corresponding file descriptor

    Raises:
    ValueError if the object is invalid
    """
    if isinstance(fileobj, int):
        fd = fileobj
    else:
        try:
            fd = int(fileobj.fileno())
        except (AttributeError, TypeError, ValueError):
            raise ValueError("Invalid file object: "
                             "{!r}".format(fileobj)) from None
    if fd < 0:
        raise ValueError("Invalid file descriptor: {}".format(fd))
    return fd


SelectorKey = namedtuple('SelectorKey', ['fileobj', 'fd', 'events', 'data'])

SelectorKey.__doc__ = """SelectorKey(fileobj, fd, events, data)

    Object used to associate a file object to its backing
    file descriptor, selected event mask, and attached data.
"""
if sys.version_info >= (3, 5):
    SelectorKey.fileobj.__doc__ = 'File object registered.'
    SelectorKey.fd.__doc__ = 'Underlying file descriptor.'
    SelectorKey.events.__doc__ = 'Events that must be waited for on this file object.'
    SelectorKey.data.__doc__ = ('''Optional opaque data associated to this file object.
    For example, this could be used to store a per-client session ID.''')

class _SelectorMapping(Mapping):
    """Mapping of file objects to selector keys."""

    def __init__(self, selector):
        self._selector = selector

    def __len__(self):
        return len(self._selector._fd_to_key)

    def __getitem__(self, fileobj):
        try:
            fd = self._selector._fileobj_lookup(fileobj)
            return self._selector._fd_to_key[fd]
        except KeyError:
            raise KeyError("{!r} is not registered".format(fileobj)) from None

    def __iter__(self):
        return iter(self._selector._fd_to_key)


class BaseSelector(metaclass=ABCMeta):
    """Selector abstract base class.

    A selector supports registering file objects to be monitored for specific
    I/O events.

    A file object is a file descriptor or any object with a `fileno()` method.
    An arbitrary object can be attached to the file object, which can be used
    for example to store context information, a callback, etc.

    A selector can use various implementations (select(), poll(), epoll()...)
    depending on the platform. The default `Selector` class uses the most
    efficient implementation on the current platform.
    """

    @abstractmethod
    def register(self, fileobj, events, data=None):
        """Register a file object.

        Parameters:
        fileobj -- file object or file descriptor
        events  -- events to monitor (bitwise mask of EVENT_READ|EVENT_WRITE)
        data    -- attached data

        Returns:
        SelectorKey instance

        Raises:
        ValueError if events is invalid
        KeyError if fileobj is already registered
        OSError if fileobj is closed or otherwise is unacceptable to
                the underlying system call (if a system call is made)

        Note:
        OSError may or may not be raised
        """
        raise NotImplementedError

    @abstractmethod
    def unregister(self, fileobj):
        """Unregister a file object.

        Parameters:
        fileobj -- file object or file descriptor

        Returns:
        SelectorKey instance

        Raises:
        KeyError if fileobj is not registered

        Note:
        If fileobj is registered but has since been closed this does
        *not* raise OSError (even if the wrapped syscall does)
        """
        raise NotImplementedError

    def modify(self, fileobj, events, data=None):
        """Change a registered file object monitored events or attached data.

        Parameters:
        fileobj -- file object or file descriptor
        events  -- events to monitor (bitwise mask of EVENT_READ|EVENT_WRITE)
        data    -- attached data

        Returns:
        SelectorKey instance

        Raises:
        Anything that unregister() or register() raises
        """
        self.unregister(fileobj)
        return self.register(fileobj, events, data)

    @abstractmethod
    def select(self, timeout=None):
        """Perform the actual selection, until some monitored file objects are
        ready or a timeout expires.

        Parameters:
        timeout -- if timeout > 0, this specifies the maximum wait time, in
                   seconds
                   if timeout <= 0, the select() call won't block, and will
                   report the currently ready file objects
                   if timeout is None, select() will block until a monitored
                   file object becomes ready

        Returns:
        list of (key, events) for ready file objects
        `events` is a bitwise mask of EVENT_READ|EVENT_WRITE
        """
        raise NotImplementedError

    def close(self):
        """Close the selector.

        This must be called to make sure that any underlying resource is freed.
        """
        pass

    def get_key(self, fileobj):
        """Return the key associated to a registered file object.

        Returns:
        SelectorKey for this file object
        """
        mapping = self.get_map()
        if mapping is None:
            raise RuntimeError('Selector is closed')
        try:
            return mapping[fileobj]
        except KeyError:
            raise KeyError("{!r} is not registered".format(fileobj)) from None

    @abstractmethod
    def get_map(self):
        """Return a mapping of file objects to selector keys."""
        raise NotImplementedError

    def __enter__(self):
        return self

    def __exit__(self, *args):
        self.close()


class _BaseSelectorImpl(BaseSelector):
    """Base selector implementation."""

    def __init__(self):
        # this maps file descriptors to keys
        self._fd_to_key = {}
        # read-only mapping returned by get_map()
        self._map = _SelectorMapping(self)

    def _fileobj_lookup(self, fileobj):
        """Return a file descriptor from a file object.

        This wraps _fileobj_to_fd() to do an exhaustive search in case
        the object is invalid but we still have it in our map.  This
        is used by unregister() so we can unregister an object that
        was previously registered even if it is closed.  It is also
        used by _SelectorMapping.
        """
        try:
            return _fileobj_to_fd(fileobj)
        except ValueError:
            # Do an exhaustive search.
            for key in self._fd_to_key.values():
                if key.fileobj is fileobj:
                    return key.fd
            # Raise ValueError after all.
            raise

    def register(self, fileobj, events, data=None):
        if (not events) or (events & ~(EVENT_READ | EVENT_WRITE)):
            raise ValueError("Invalid events: {!r}".format(events))

        key = SelectorKey(fileobj, self._fileobj_lookup(fileobj), events, data)

        if key.fd in self._fd_to_key:
            raise KeyError("{!r} (FD {}) is already registered"
                           .format(fileobj, key.fd))

        self._fd_to_key[key.fd] = key
        return key

    def unregister(self, fileobj):
        try:
            key = self._fd_to_key.pop(self._fileobj_lookup(fileobj))
        except KeyError:
            raise KeyError("{!r} is not registered".format(fileobj)) from None
        return key

    def modify(self, fileobj, events, data=None):
        # TODO: Subclasses can probably optimize this even further.
        try:
            key = self._fd_to_key[self._fileobj_lookup(fileobj)]
        except KeyError:
            raise KeyError("{!r} is not registered".format(fileobj)) from None
        if events != key.events:
            self.unregister(fileobj)
            key = self.register(fileobj, events, data)
        elif data != key.data:
            # Use a shortcut to update the data.
            key = key._replace(data=data)
            self._fd_to_key[key.fd] = key
        return key

    def close(self):
        self._fd_to_key.clear()
        self._map = None

    def get_map(self):
        return self._map

    def _key_from_fd(self, fd):
        """Return the key associated to a given file descriptor.

        Parameters:
        fd -- file descriptor

        Returns:
        corresponding key, or None if not found
        """
        try:
            return self._fd_to_key[fd]
        except KeyError:
            return None


class SelectSelector(_BaseSelectorImpl):
    """Select-based selector."""

    def __init__(self):
        super().__init__()
        self._readers = set()
        self._writers = set()

    def register(self, fileobj, events, data=None):
        key = super().register(fileobj, events, data)
        if events & EVENT_READ:
            self._readers.add(key.fd)
        if events & EVENT_WRITE:
            self._writers.add(key.fd)
        return key

    def unregister(self, fileobj):
        key = super().unregister(fileobj)
        self._readers.discard(key.fd)
        self._writers.discard(key.fd)
        return key

    if sys.platform == 'win32':
        def _select(self, r, w, _, timeout=None):
            r, w, x = select.select(r, w, w, timeout)
            return r, w + x, []
    else:
        _select = select.select

    def select(self, timeout=None):
        timeout = None if timeout is None else max(timeout, 0)
        ready = []
        try:
            r, w, _ = self._select(self._readers, self._writers, [], timeout)
        except InterruptedError:
            return ready
        r = set(r)
        w = set(w)
        for fd in r | w:
            events = 0
            if fd in r:
                events |= EVENT_READ
            if fd in w:
                events |= EVENT_WRITE

            key = self._key_from_fd(fd)
            if key:
                ready.append((key, events & key.events))
        return ready


if hasattr(select, 'poll'):

    class PollSelector(_BaseSelectorImpl):
        """Poll-based selector."""

        def __init__(self):
            super().__init__()
            self._poll = select.poll()

        def register(self, fileobj, events, data=None):
            key = super().register(fileobj, events, data)
            poll_events = 0
            if events & EVENT_READ:
                poll_events |= select.POLLIN
            if events & EVENT_WRITE:
                poll_events |= select.POLLOUT
            self._poll.register(key.fd, poll_events)
            return key

        def unregister(self, fileobj):
            key = super().unregister(fileobj)
            self._poll.unregister(key.fd)
            return key

        def select(self, timeout=None):
            if timeout is None:
                timeout = None
            elif timeout <= 0:
                timeout = 0
            else:
                # poll() has a resolution of 1 millisecond, round away from
                # zero to wait *at least* timeout seconds.
                timeout = math.ceil(timeout * 1e3)
            ready = []
            try:
                fd_event_list = self._poll.poll(timeout)
            except InterruptedError:
                return ready
            for fd, event in fd_event_list:
                events = 0
                if event & ~select.POLLIN:
                    events |= EVENT_WRITE
                if event & ~select.POLLOUT:
                    events |= EVENT_READ

                key = self._key_from_fd(fd)
                if key:
                    ready.append((key, events & key.events))
            return ready


if hasattr(select, 'epoll'):

    class EpollSelector(_BaseSelectorImpl):
        """Epoll-based selector."""

        def __init__(self):
            super().__init__()
            self._epoll = select.epoll()

        def fileno(self):
            return self._epoll.fileno()

        def register(self, fileobj, events, data=None):
            key = super().register(fileobj, events, data)
            epoll_events = 0
            if events & EVENT_READ:
                epoll_events |= select.EPOLLIN
            if events & EVENT_WRITE:
                epoll_events |= select.EPOLLOUT
            try:
                self._epoll.register(key.fd, epoll_events)
            except BaseException:
                super().unregister(fileobj)
                raise
            return key

        def unregister(self, fileobj):
            key = super().unregister(fileobj)
            try:
                self._epoll.unregister(key.fd)
            except OSError:
                # This can happen if the FD was closed since it
                # was registered.
                pass
            return key

        def select(self, timeout=None):
            if timeout is None:
                timeout = -1
            elif timeout <= 0:
                timeout = 0
            else:
                # epoll_wait() has a resolution of 1 millisecond, round away
                # from zero to wait *at least* timeout seconds.
                timeout = math.ceil(timeout * 1e3) * 1e-3

            # epoll_wait() expects `maxevents` to be greater than zero;
            # we want to make sure that `select()` can be called when no
            # FD is registered.
            max_ev = max(len(self._fd_to_key), 1)

            ready = []
            try:
                fd_event_list = self._epoll.poll(timeout, max_ev)
            except InterruptedError:
                return ready
            for fd, event in fd_event_list:
                events = 0
                if event & ~select.EPOLLIN:
                    events |= EVENT_WRITE
                if event & ~select.EPOLLOUT:
                    events |= EVENT_READ

                key = self._key_from_fd(fd)
                if key:
                    ready.append((key, events & key.events))
            return ready

        def close(self):
            self._epoll.close()
            super().close()


if hasattr(select, 'devpoll'):

    class DevpollSelector(_BaseSelectorImpl):
        """Solaris /dev/poll selector."""

        def __init__(self):
            super().__init__()
            self._devpoll = select.devpoll()

        def fileno(self):
            return self._devpoll.fileno()

        def register(self, fileobj, events, data=None):
            key = super().register(fileobj, events, data)
            poll_events = 0
            if events & EVENT_READ:
                poll_events |= select.POLLIN
            if events & EVENT_WRITE:
                poll_events |= select.POLLOUT
            self._devpoll.register(key.fd, poll_events)
            return key

        def unregister(self, fileobj):
            key = super().unregister(fileobj)
            self._devpoll.unregister(key.fd)
            return key

        def select(self, timeout=None):
            if timeout is None:
                timeout = None
            elif timeout <= 0:
                timeout = 0
            else:
                # devpoll() has a resolution of 1 millisecond, round away from
                # zero to wait *at least* timeout seconds.
                timeout = math.ceil(timeout * 1e3)
            ready = []
            try:
                fd_event_list = self._devpoll.poll(timeout)
            except InterruptedError:
                return ready
            for fd, event in fd_event_list:
                events = 0
                if event & ~select.POLLIN:
                    events |= EVENT_WRITE
                if event & ~select.POLLOUT:
                    events |= EVENT_READ

                key = self._key_from_fd(fd)
                if key:
                    ready.append((key, events & key.events))
            return ready

        def close(self):
            self._devpoll.close()
            super().close()


if hasattr(select, 'kqueue'):

    class KqueueSelector(_BaseSelectorImpl):
        """Kqueue-based selector."""

        def __init__(self):
            super().__init__()
            self._kqueue = select.kqueue()

        def fileno(self):
            return self._kqueue.fileno()

        def register(self, fileobj, events, data=None):
            key = super().register(fileobj, events, data)
            try:
                if events & EVENT_READ:
                    kev = select.kevent(key.fd, select.KQ_FILTER_READ,
                                        select.KQ_EV_ADD)
                    self._kqueue.control([kev], 0, 0)
                if events & EVENT_WRITE:
                    kev = select.kevent(key.fd, select.KQ_FILTER_WRITE,
                                        select.KQ_EV_ADD)
                    self._kqueue.control([kev], 0, 0)
            except BaseException:
                super().unregister(fileobj)
                raise
            return key

        def unregister(self, fileobj):
            key = super().unregister(fileobj)
            if key.events & EVENT_READ:
                kev = select.kevent(key.fd, select.KQ_FILTER_READ,
                                    select.KQ_EV_DELETE)
                try:
                    self._kqueue.control([kev], 0, 0)
                except OSError:
                    # This can happen if the FD was closed since it
                    # was registered.
                    pass
            if key.events & EVENT_WRITE:
                kev = select.kevent(key.fd, select.KQ_FILTER_WRITE,
                                    select.KQ_EV_DELETE)
                try:
                    self._kqueue.control([kev], 0, 0)
                except OSError:
                    # See comment above.
                    pass
            return key

        def select(self, timeout=None):
            timeout = None if timeout is None else max(timeout, 0)
            max_ev = len(self._fd_to_key)
            ready = []
            try:
                kev_list = self._kqueue.control(None, max_ev, timeout)
            except InterruptedError:
                return ready
            for kev in kev_list:
                fd = kev.ident
                flag = kev.filter
                events = 0
                if flag == select.KQ_FILTER_READ:
                    events |= EVENT_READ
                if flag == select.KQ_FILTER_WRITE:
                    events |= EVENT_WRITE

                key = self._key_from_fd(fd)
                if key:
                    ready.append((key, events & key.events))
            return ready

        def close(self):
            self._kqueue.close()
            super().close()


# Choose the best implementation, roughly:
#    epoll|kqueue|devpoll > poll > select.
# select() also can't accept a FD > FD_SETSIZE (usually around 1024)
if 'KqueueSelector' in globals():
    DefaultSelector = KqueueSelector
elif 'EpollSelector' in globals():
    DefaultSelector = EpollSelector
elif 'DevpollSelector' in globals():
    DefaultSelector = DevpollSelector
elif 'PollSelector' in globals():
    DefaultSelector = PollSelector
else:
    DefaultSelector = SelectSelector

Youez - 2016 - github.com/yon3zu
LinuXploit