PNG  IHDRX cHRMz&u0`:pQ<bKGD pHYsodtIME MeqIDATxw]Wug^Qd˶ 6`!N:!@xI~)%7%@Bh&`lnjVF29gΨ4E$|>cɚ{gk= %,a KX%,a KX%,a KX%,a KX%,a KX%,a KX%, b` ǟzeאfp]<!SJmɤY޲ڿ,%c ~ع9VH.!Ͳz&QynֺTkRR.BLHi٪:l;@(!MԴ=žI,:o&N'Kù\vRmJ雵֫AWic H@" !: Cé||]k-Ha oݜ:y F())u]aG7*JV@J415p=sZH!=!DRʯvɱh~V\}v/GKY$n]"X"}t@ xS76^[bw4dsce)2dU0 CkMa-U5tvLƀ~mlMwfGE/-]7XAƟ`׮g ewxwC4\[~7@O-Q( a*XGƒ{ ՟}$_y3tĐƤatgvێi|K=uVyrŲlLӪuܿzwk$m87k( `múcE)"@rK( z4$D; 2kW=Xb$V[Ru819קR~qloѱDyįݎ*mxw]y5e4K@ЃI0A D@"BDk_)N\8͜9dz"fK0zɿvM /.:2O{ Nb=M=7>??Zuo32 DLD@D| &+֎C #B8ַ`bOb $D#ͮҪtx]%`ES`Ru[=¾!@Od37LJ0!OIR4m]GZRJu$‡c=%~s@6SKy?CeIh:[vR@Lh | (BhAMy=݃  G"'wzn޺~8ԽSh ~T*A:xR[ܹ?X[uKL_=fDȊ؂p0}7=D$Ekq!/t.*2ʼnDbŞ}DijYaȲ(""6HA;:LzxQ‘(SQQ}*PL*fc\s `/d'QXW, e`#kPGZuŞuO{{wm[&NBTiiI0bukcA9<4@SӊH*؎4U/'2U5.(9JuDfrޱtycU%j(:RUbArLֺN)udA':uGQN"-"Is.*+k@ `Ojs@yU/ H:l;@yyTn}_yw!VkRJ4P)~y#)r,D =ě"Q]ci'%HI4ZL0"MJy 8A{ aN<8D"1#IJi >XjX֔#@>-{vN!8tRݻ^)N_╗FJEk]CT՟ YP:_|H1@ CBk]yKYp|og?*dGvzنzӴzjֺNkC~AbZƷ`.H)=!QͷVTT(| u78y֮}|[8-Vjp%2JPk[}ԉaH8Wpqhwr:vWª<}l77_~{s۴V+RCģ%WRZ\AqHifɤL36: #F:p]Bq/z{0CU6ݳEv_^k7'>sq*+kH%a`0ԣisqにtү04gVgW΂iJiS'3w.w}l6MC2uԯ|>JF5`fV5m`Y**Db1FKNttu]4ccsQNnex/87+}xaUW9y>ͯ骵G{䩓Գ3+vU}~jJ.NFRD7<aJDB1#ҳgSb,+CS?/ VG J?|?,2#M9}B)MiE+G`-wo߫V`fio(}S^4e~V4bHOYb"b#E)dda:'?}׮4繏`{7Z"uny-?ǹ;0MKx{:_pÚmFמ:F " .LFQLG)Q8qN q¯¯3wOvxDb\. BKD9_NN &L:4D{mm o^tֽ:q!ƥ}K+<"m78N< ywsard5+Š²z~mnG)=}lYݧNj'QJS{S :UYS-952?&O-:W}(!6Mk4+>A>j+i|<<|;ر^߉=HE|V#F)Emm#}/"y GII웻Jі94+v뾧xu~5C95~ūH>c@덉pʃ1/4-A2G%7>m;–Y,cyyaln" ?ƻ!ʪ<{~h~i y.zZB̃/,雋SiC/JFMmBH&&FAbϓO^tubbb_hZ{_QZ-sύodFgO(6]TJA˯#`۶ɟ( %$&+V'~hiYy>922 Wp74Zkq+Ovn錄c>8~GqܲcWꂎz@"1A.}T)uiW4="jJ2W7mU/N0gcqܗOO}?9/wìXžΏ0 >֩(V^Rh32!Hj5`;O28؇2#ݕf3 ?sJd8NJ@7O0 b־?lldщ̡&|9C.8RTWwxWy46ah嘦mh٤&l zCy!PY?: CJyв]dm4ǜҐR޻RլhX{FƯanшQI@x' ao(kUUuxW_Ñ줮[w8 FRJ(8˼)_mQ _!RJhm=!cVmm ?sFOnll6Qk}alY}; "baӌ~M0w,Ggw2W:G/k2%R,_=u`WU R.9T"v,<\Ik޽/2110Ӿxc0gyC&Ny޽JҢrV6N ``یeA16"J³+Rj*;BϜkZPJaÍ<Jyw:NP8/D$ 011z֊Ⱳ3ι֘k1V_"h!JPIΣ'ɜ* aEAd:ݺ>y<}Lp&PlRfTb1]o .2EW\ͮ]38؋rTJsǏP@芎sF\> P^+dYJLbJ C-xϐn> ι$nj,;Ǖa FU *择|h ~izť3ᤓ`K'-f tL7JK+vf2)V'-sFuB4i+m+@My=O҈0"|Yxoj,3]:cо3 $#uŘ%Y"y죯LebqtҢVzq¼X)~>4L׶m~[1_k?kxֺQ`\ |ٛY4Ѯr!)N9{56(iNq}O()Em]=F&u?$HypWUeB\k]JɩSع9 Zqg4ZĊo oMcjZBU]B\TUd34ݝ~:7ڶSUsB0Z3srx 7`:5xcx !qZA!;%͚7&P H<WL!džOb5kF)xor^aujƍ7 Ǡ8/p^(L>ὴ-B,{ۇWzֺ^k]3\EE@7>lYBȝR.oHnXO/}sB|.i@ɥDB4tcm,@ӣgdtJ!lH$_vN166L__'Z)y&kH;:,Y7=J 9cG) V\hjiE;gya~%ks_nC~Er er)muuMg2;֫R)Md) ,¶ 2-wr#F7<-BBn~_(o=KO㭇[Xv eN_SMgSҐ BS헃D%g_N:/pe -wkG*9yYSZS.9cREL !k}<4_Xs#FmҶ:7R$i,fi!~' # !6/S6y@kZkZcX)%5V4P]VGYq%H1!;e1MV<!ϐHO021Dp= HMs~~a)ަu7G^];git!Frl]H/L$=AeUvZE4P\.,xi {-~p?2b#amXAHq)MWǾI_r`S Hz&|{ +ʖ_= (YS(_g0a03M`I&'9vl?MM+m~}*xT۲(fY*V4x@29s{DaY"toGNTO+xCAO~4Ϳ;p`Ѫ:>Ҵ7K 3}+0 387x\)a"/E>qpWB=1 ¨"MP(\xp߫́A3+J] n[ʼnӼaTbZUWb={~2ooKױӰp(CS\S筐R*JغV&&"FA}J>G֐p1ٸbk7 ŘH$JoN <8s^yk_[;gy-;߉DV{c B yce% aJhDȶ 2IdйIB/^n0tNtџdcKj4϶v~- CBcgqx9= PJ) dMsjpYB] GD4RDWX +h{y`,3ꊕ$`zj*N^TP4L:Iz9~6s) Ga:?y*J~?OrMwP\](21sZUD ?ܟQ5Q%ggW6QdO+\@ ̪X'GxN @'4=ˋ+*VwN ne_|(/BDfj5(Dq<*tNt1х!MV.C0 32b#?n0pzj#!38}޴o1KovCJ`8ŗ_"]] rDUy޲@ Ȗ-;xџ'^Y`zEd?0„ DAL18IS]VGq\4o !swV7ˣι%4FѮ~}6)OgS[~Q vcYbL!wG3 7띸*E Pql8=jT\꘿I(z<[6OrR8ºC~ډ]=rNl[g|v TMTղb-o}OrP^Q]<98S¤!k)G(Vkwyqyr޽Nv`N/e p/~NAOk \I:G6]4+K;j$R:Mi #*[AȚT,ʰ,;N{HZTGMoּy) ]%dHء9Պ䠬|<45,\=[bƟ8QXeB3- &dҩ^{>/86bXmZ]]yޚN[(WAHL$YAgDKp=5GHjU&99v簪C0vygln*P)9^͞}lMuiH!̍#DoRBn9l@ xA/_v=ȺT{7Yt2N"4!YN`ae >Q<XMydEB`VU}u]嫇.%e^ánE87Mu\t`cP=AD/G)sI"@MP;)]%fH9'FNsj1pVhY&9=0pfuJ&gޤx+k:!r˭wkl03׼Ku C &ѓYt{.O.zҏ z}/tf_wEp2gvX)GN#I ݭ߽v/ .& и(ZF{e"=V!{zW`, ]+LGz"(UJp|j( #V4, 8B 0 9OkRrlɱl94)'VH9=9W|>PS['G(*I1==C<5"Pg+x'K5EMd؞Af8lG ?D FtoB[je?{k3zQ vZ;%Ɠ,]E>KZ+T/ EJxOZ1i #T<@ I}q9/t'zi(EMqw`mYkU6;[t4DPeckeM;H}_g pMww}k6#H㶏+b8雡Sxp)&C $@'b,fPߑt$RbJ'vznuS ~8='72_`{q纶|Q)Xk}cPz9p7O:'|G~8wx(a 0QCko|0ASD>Ip=4Q, d|F8RcU"/KM opKle M3#i0c%<7׿p&pZq[TR"BpqauIp$ 8~Ĩ!8Սx\ւdT>>Z40ks7 z2IQ}ItԀ<-%S⍤};zIb$I 5K}Q͙D8UguWE$Jh )cu4N tZl+[]M4k8֦Zeq֮M7uIqG 1==tLtR,ƜSrHYt&QP윯Lg' I,3@P'}'R˪e/%-Auv·ñ\> vDJzlӾNv5:|K/Jb6KI9)Zh*ZAi`?S {aiVDԲuy5W7pWeQJk֤#5&V<̺@/GH?^τZL|IJNvI:'P=Ϛt"¨=cud S Q.Ki0 !cJy;LJR;G{BJy޺[^8fK6)=yʊ+(k|&xQ2`L?Ȓ2@Mf 0C`6-%pKpm')c$׻K5[J*U[/#hH!6acB JA _|uMvDyk y)6OPYjœ50VT K}cǻP[ $:]4MEA.y)|B)cf-A?(e|lɉ#P9V)[9t.EiQPDѠ3ϴ;E:+Օ t ȥ~|_N2,ZJLt4! %ա]u {+=p.GhNcŞQI?Nd'yeh n7zi1DB)1S | S#ًZs2|Ɛy$F SxeX{7Vl.Src3E℃Q>b6G ўYCmtկ~=K0f(=LrAS GN'ɹ9<\!a`)֕y[uՍ[09` 9 +57ts6}b4{oqd+J5fa/,97J#6yν99mRWxJyѡyu_TJc`~W>l^q#Ts#2"nD1%fS)FU w{ܯ R{ ˎ󅃏џDsZSQS;LV;7 Od1&1n$ N /.q3~eNɪ]E#oM~}v֯FڦwyZ=<<>Xo稯lfMFV6p02|*=tV!c~]fa5Y^Q_WN|Vs 0ҘދU97OI'N2'8N֭fgg-}V%y]U4 峧p*91#9U kCac_AFңĪy뚇Y_AiuYyTTYЗ-(!JFLt›17uTozc. S;7A&&<ԋ5y;Ro+:' *eYJkWR[@F %SHWP 72k4 qLd'J "zB6{AC0ƁA6U.'F3:Ȅ(9ΜL;D]m8ڥ9}dU "v!;*13Rg^fJyShyy5auA?ɩGHRjo^]׽S)Fm\toy 4WQS@mE#%5ʈfFYDX ~D5Ϡ9tE9So_aU4?Ѽm%&c{n>.KW1Tlb}:j uGi(JgcYj0qn+>) %\!4{LaJso d||u//P_y7iRJ߬nHOy) l+@$($VFIQ9%EeKʈU. ia&FY̒mZ=)+qqoQn >L!qCiDB;Y<%} OgBxB!ØuG)WG9y(Ą{_yesuZmZZey'Wg#C~1Cev@0D $a@˲(.._GimA:uyw֬%;@!JkQVM_Ow:P.s\)ot- ˹"`B,e CRtaEUP<0'}r3[>?G8xU~Nqu;Wm8\RIkբ^5@k+5(By'L&'gBJ3ݶ!/㮻w҅ yqPWUg<e"Qy*167΃sJ\oz]T*UQ<\FԎ`HaNmڜ6DysCask8wP8y9``GJ9lF\G g's Nn͵MLN֪u$| /|7=]O)6s !ĴAKh]q_ap $HH'\1jB^s\|- W1:=6lJBqjY^LsPk""`]w)󭃈,(HC ?䔨Y$Sʣ{4Z+0NvQkhol6C.婧/u]FwiVjZka&%6\F*Ny#8O,22+|Db~d ~Çwc N:FuuCe&oZ(l;@ee-+Wn`44AMK➝2BRՈt7g*1gph9N) *"TF*R(#'88pm=}X]u[i7bEc|\~EMn}P瘊J)K.0i1M6=7'_\kaZ(Th{K*GJyytw"IO-PWJk)..axӝ47"89Cc7ĐBiZx 7m!fy|ϿF9CbȩV 9V-՛^pV̌ɄS#Bv4-@]Vxt-Z, &ֺ*diؠ2^VXbs֔Ìl.jQ]Y[47gj=幽ex)A0ip׳ W2[ᎇhuE^~q흙L} #-b۸oFJ_QP3r6jr+"nfzRJTUqoaۍ /$d8Mx'ݓ= OՃ| )$2mcM*cЙj}f };n YG w0Ia!1Q.oYfr]DyISaP}"dIӗթO67jqR ҊƐƈaɤGG|h;t]䗖oSv|iZqX)oalv;۩meEJ\!8=$4QU4Xo&VEĊ YS^E#d,yX_> ۘ-e\ "Wa6uLĜZi`aD9.% w~mB(02G[6y.773a7 /=o7D)$Z 66 $bY^\CuP. (x'"J60׿Y:Oi;F{w佩b+\Yi`TDWa~|VH)8q/=9!g߆2Y)?ND)%?Ǐ`k/sn:;O299yB=a[Ng 3˲N}vLNy;*?x?~L&=xyӴ~}q{qE*IQ^^ͧvü{Huu=R|>JyUlZV, B~/YF!Y\u_ݼF{_C)LD]m {H 0ihhadd nUkf3oٺCvE\)QJi+֥@tDJkB$1!Đr0XQ|q?d2) Ӣ_}qv-< FŊ߫%roppVBwü~JidY4:}L6M7f٬F "?71<2#?Jyy4뷢<_a7_=Q E=S1И/9{+93֮E{ǂw{))?maÆm(uLE#lïZ  ~d];+]h j?!|$F}*"4(v'8s<ŏUkm7^7no1w2ؗ}TrͿEk>p'8OB7d7R(A 9.*Mi^ͳ; eeUwS+C)uO@ =Sy]` }l8^ZzRXj[^iUɺ$tj))<sbDJfg=Pk_{xaKo1:-uyG0M ԃ\0Lvuy'ȱc2Ji AdyVgVh!{]/&}}ċJ#%d !+87<;qN޼Nفl|1N:8ya  8}k¾+-$4FiZYÔXk*I&'@iI99)HSh4+2G:tGhS^繿 Kتm0 вDk}֚+QT4;sC}rՅE,8CX-e~>G&'9xpW,%Fh,Ry56Y–hW-(v_,? ; qrBk4-V7HQ;ˇ^Gv1JVV%,ik;D_W!))+BoS4QsTM;gt+ndS-~:11Sgv!0qRVh!"Ȋ(̦Yl.]PQWgٳE'`%W1{ndΗBk|Ž7ʒR~,lnoa&:ü$ 3<a[CBݮwt"o\ePJ=Hz"_c^Z.#ˆ*x z̝grY]tdkP*:97YľXyBkD4N.C_[;F9`8& !AMO c `@BA& Ost\-\NX+Xp < !bj3C&QL+*&kAQ=04}cC!9~820G'PC9xa!w&bo_1 Sw"ܱ V )Yl3+ס2KoXOx]"`^WOy :3GO0g;%Yv㐫(R/r (s } u B &FeYZh0y> =2<Ϟc/ -u= c&׭,.0"g"7 6T!vl#sc>{u/Oh Bᾈ)۴74]x7 gMӒ"d]U)}" v4co[ ɡs 5Gg=XR14?5A}D "b{0$L .\4y{_fe:kVS\\O]c^W52LSBDM! C3Dhr̦RtArx4&agaN3Cf<Ԉp4~ B'"1@.b_/xQ} _߃҉/gٓ2Qkqp0շpZ2fԫYz< 4L.Cyυι1t@鎫Fe sYfsF}^ V}N<_`p)alٶ "(XEAVZ<)2},:Ir*#m_YӼ R%a||EƼIJ,,+f"96r/}0jE/)s)cjW#w'Sʯ5<66lj$a~3Kʛy 2:cZ:Yh))+a߭K::N,Q F'qB]={.]h85C9cr=}*rk?vwV렵ٸW Rs%}rNAkDv|uFLBkWY YkX מ|)1!$#3%y?pF<@<Rr0}: }\J [5FRxY<9"SQdE(Q*Qʻ)q1E0B_O24[U'],lOb ]~WjHޏTQ5Syu wq)xnw8~)c 쫬gٲߠ H% k5dƝk> kEj,0% b"vi2Wس_CuK)K{n|>t{P1򨾜j>'kEkƗBg*H%'_aY6Bn!TL&ɌOb{c`'d^{t\i^[uɐ[}q0lM˕G:‚4kb祔c^:?bpg… +37stH:0}en6x˟%/<]BL&* 5&fK9Mq)/iyqtA%kUe[ڛKN]Ě^,"`/ s[EQQm?|XJ߅92m]G.E΃ח U*Cn.j_)Tѧj̿30ڇ!A0=͜ar I3$C^-9#|pk!)?7.x9 @OO;WƝZBFU keZ75F6Tc6"ZȚs2y/1 ʵ:u4xa`C>6Rb/Yм)^=+~uRd`/|_8xbB0?Ft||Z\##|K 0>>zxv8۴吅q 8ĥ)"6>~\8:qM}#͚'ĉ#p\׶ l#bA?)|g g9|8jP(cr,BwV (WliVxxᡁ@0Okn;ɥh$_ckCgriv}>=wGzβ KkBɛ[˪ !J)h&k2%07δt}!d<9;I&0wV/ v 0<H}L&8ob%Hi|޶o&h1L|u֦y~󛱢8fٲUsւ)0oiFx2}X[zVYr_;N(w]_4B@OanC?gĦx>мgx>ΛToZoOMp>40>V Oy V9iq!4 LN,ˢu{jsz]|"R޻&'ƚ{53ўFu(<٪9:΋]B;)B>1::8;~)Yt|0(pw2N%&X,URBK)3\zz&}ax4;ǟ(tLNg{N|Ǽ\G#C9g$^\}p?556]/RP.90 k,U8/u776s ʪ_01چ|\N 0VV*3H鴃J7iI!wG_^ypl}r*jɤSR 5QN@ iZ#1ٰy;_\3\BQQ x:WJv츟ٯ$"@6 S#qe딇(/P( Dy~TOϻ<4:-+F`0||;Xl-"uw$Цi󼕝mKʩorz"mϺ$F:~E'ҐvD\y?Rr8_He@ e~O,T.(ފR*cY^m|cVR[8 JҡSm!ΆԨb)RHG{?MpqrmN>߶Y)\p,d#xۆWY*,l6]v0h15M˙MS8+EdI='LBJIH7_9{Caз*Lq,dt >+~ّeʏ?xԕ4bBAŚjﵫ!'\Ը$WNvKO}ӽmSşذqsOy?\[,d@'73'j%kOe`1.g2"e =YIzS2|zŐƄa\U,dP;jhhhaxǶ?КZ՚.q SE+XrbOu%\GتX(H,N^~]JyEZQKceTQ]VGYqnah;y$cQahT&QPZ*iZ8UQQM.qo/T\7X"u?Mttl2Xq(IoW{R^ ux*SYJ! 4S.Jy~ BROS[V|žKNɛP(L6V^|cR7i7nZW1Fd@ Ara{詑|(T*dN]Ko?s=@ |_EvF]׍kR)eBJc" MUUbY6`~V޴dJKß&~'d3i WWWWWW

F1l3 Manager

Current Directory: /usr/share/doc/lua-socket
/usr/share/doc/lua-socket/
Viewing File: /usr/share/doc/lua-socket/udp.html
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <meta name="description" content="LuaSocket: The UDP support"> <meta name="keywords" content="Lua, LuaSocket, Socket, UDP, Library, Network, Support"> <title>LuaSocket: UDP support</title> <link rel="stylesheet" href="reference.css" type="text/css"> </head> <body> <!-- header ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ --> <div class=header> <hr> <center> <table summary="LuaSocket logo"> <tr><td align=center><a href="http://www.lua.org"> <img width=128 height=128 border=0 alt="LuaSocket" src="luasocket.png"> </a></td></tr> <tr><td align=center valign=top>Network support for the Lua language </td></tr> </table> <p class=bar> <a href="index.html">home</a> &middot; <a href="index.html#download">download</a> &middot; <a href="installation.html">installation</a> &middot; <a href="introduction.html">introduction</a> &middot; <a href="reference.html">reference</a> </p> </center> <hr> </div> <!-- udp ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ --> <h2 id="udp">UDP</h2> <!-- socket.udp ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ --> <p class="name" id="socket.udp"> socket.<b>udp()</b> </p> <p class="description"> Creates and returns an unconnected IPv4 UDP object. Unconnected objects support the <a href="#sendto"><tt>sendto</tt></a>, <a href="#receive"><tt>receive</tt></a>, <a href="#receivefrom"><tt>receivefrom</tt></a>, <a href="#getoption"><tt>getoption</tt></a>, <a href="#getsockname"><tt>getsockname</tt></a>, <a href="#setoption"><tt>setoption</tt></a>, <a href="#settimeout"><tt>settimeout</tt></a>, <a href="#setpeername"><tt>setpeername</tt></a>, <a href="#setsockname"><tt>setsockname</tt></a>, and <a href="#close"><tt>close</tt></a>. The <a href="#setpeername"><tt>setpeername</tt></a> is used to connect the object. </p> <p class="return"> In case of success, a new unconnected UDP object returned. In case of error, <b><tt>nil</tt></b> is returned, followed by an error message. </p> <!-- socket.udp ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ --> <p class="name" id="socket.udp6"> socket.<b>udp6()</b> </p> <p class="description"> Creates and returns an unconnected IPv6 UDP object. Unconnected objects support the <a href="#sendto"><tt>sendto</tt></a>, <a href="#receive"><tt>receive</tt></a>, <a href="#receivefrom"><tt>receivefrom</tt></a>, <a href="#getoption"><tt>getoption</tt></a>, <a href="#getsockname"><tt>getsockname</tt></a>, <a href="#setoption"><tt>setoption</tt></a>, <a href="#settimeout"><tt>settimeout</tt></a>, <a href="#setpeername"><tt>setpeername</tt></a>, <a href="#setsockname"><tt>setsockname</tt></a>, and <a href="#close"><tt>close</tt></a>. The <a href="#setpeername"><tt>setpeername</tt></a> is used to connect the object. </p> <p class="return"> In case of success, a new unconnected UDP object returned. In case of error, <b><tt>nil</tt></b> is returned, followed by an error message. </p> <p class=note> Note: The TCP object returned will have the option "<tt>ipv6-v6only</tt>" set to <tt><b>true</b></tt>. </p> <!-- close +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ --> <!-- close +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ --> <p class="name" id="close"> connected:<b>close()</b><br> unconnected:<b>close()</b> </p> <p class="description"> Closes a UDP object. The internal socket used by the object is closed and the local address to which the object was bound is made available to other applications. No further operations (except for further calls to the <tt>close</tt> method) are allowed on a closed socket. </p> <p class="note"> Note: It is important to close all used sockets once they are not needed, since, in many systems, each socket uses a file descriptor, which are limited system resources. Garbage-collected objects are automatically closed before destruction, though. </p> <!-- getpeername +++++++++++++++++++++++++++++++++++++++++++++++++++++++ --> <p class="name" id="getpeername"> connected:<b>getpeername()</b> </p> <p class="description"> Retrieves information about the peer associated with a connected UDP object. </p> <p class=return> Returns a string with the IP address of the peer, the port number that peer is using for the connection, and a string with the family ("<tt>inet</tt>" or "<tt>inet6</tt>"). In case of error, the method returns <b><tt>nil</tt></b>. </p> <p class="note"> Note: It makes no sense to call this method on unconnected objects. </p> <!-- getsockname +++++++++++++++++++++++++++++++++++++++++++++++++++++++ --> <p class="name" id="getsockname"> connected:<b>getsockname()</b><br> unconnected:<b>getsockname()</b> </p> <p class="description"> Returns the local address information associated to the object. </p> <p class=return> The method returns a string with local IP address, a number with the local port, and a string with the family ("<tt>inet</tt>" or "<tt>inet6</tt>"). In case of error, the method returns <b><tt>nil</tt></b>. </p> <p class="note"> Note: UDP sockets are not bound to any address until the <a href="#setsockname"><tt>setsockname</tt></a> or the <a href="#sendto"><tt>sendto</tt></a> method is called for the first time (in which case it is bound to an ephemeral port and the wild-card address). </p> <!-- receive +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ --> <p class="name" id="receive"> connected:<b>receive(</b>[size]<b>)</b><br> unconnected:<b>receive(</b>[size]<b>)</b> </p> <p class="description"> Receives a datagram from the UDP object. If the UDP object is connected, only datagrams coming from the peer are accepted. Otherwise, the returned datagram can come from any host. </p> <p class="parameters"> The optional <tt>size</tt> parameter specifies the maximum size of the datagram to be retrieved. If there are more than <tt>size</tt> bytes available in the datagram, the excess bytes are discarded. If there are less then <tt>size</tt> bytes available in the current datagram, the available bytes are returned. If <tt>size</tt> is omitted, the maximum datagram size is used (which is currently limited by the implementation to 8192 bytes). </p> <p class="return"> In case of success, the method returns the received datagram. In case of timeout, the method returns <b><tt>nil</tt></b> followed by the string '<tt>timeout</tt>'. </p> <!-- receivefrom +++++++++++++++++++++++++++++++++++++++++++++++++++++++ --> <p class="name" id="receivefrom"> unconnected:<b>receivefrom(</b>[size]<b>)</b> </p> <p class="description"> Works exactly as the <a href="#receive"><tt>receive</tt></a> method, except it returns the IP address and port as extra return values (and is therefore slightly less efficient). </p> <!-- getoption +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ --> <p class="name" id="getoption"> connected:<b>getoption()</b><br> unconnected:<b>getoption()</b> </p> <p class="description"> Gets an option value from the UDP object. See <a href=#setoption><tt>setoption</tt></a> for description of the option names and values. </p> <p class="parameters"><tt>Option</tt> is a string with the option name. <ul> <li> '<tt>dontroute</tt>' <li> '<tt>broadcast</tt>' <li> '<tt>reuseaddr</tt>' <li> '<tt>reuseport</tt>' <li> '<tt>ip-multicast-loop</tt>' <li> '<tt>ipv6-v6only</tt>' <li> '<tt>ip-multicast-if</tt>' <li> '<tt>ip-multicast-ttl</tt>' <li> '<tt>ip-add-membership</tt>' <li> '<tt>ip-drop-membership</tt>' </ul> </p> <p class=return> The method returns the option <tt>value</tt> in case of success, or <b><tt>nil</tt></b> followed by an error message otherwise. </p> <!-- send ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ --> <p class="name" id="send"> connected:<b>send(</b>datagram<b>)</b> </p> <p class="description"> Sends a datagram to the UDP peer of a connected object. </p> <p class="parameters"> <tt>Datagram</tt> is a string with the datagram contents. The maximum datagram size for UDP is 64K minus IP layer overhead. However datagrams larger than the link layer packet size will be fragmented, which may deteriorate performance and/or reliability. </p> <p class="return"> If successful, the method returns 1. In case of error, the method returns <b><tt>nil</tt></b> followed by an error message. </p> <p class="note"> Note: In UDP, the <tt>send</tt> method never blocks and the only way it can fail is if the underlying transport layer refuses to send a message to the specified address (i.e. no interface accepts the address). </p> <!-- sendto ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ --> <p class="name" id="sendto"> unconnected:<b>sendto(</b>datagram, ip, port<b>)</b> </p> <p class="description"> Sends a datagram to the specified IP address and port number. </p> <p class="parameters"> <tt>Datagram</tt> is a string with the datagram contents. The maximum datagram size for UDP is 64K minus IP layer overhead. However datagrams larger than the link layer packet size will be fragmented, which may deteriorate performance and/or reliability. <tt>Ip</tt> is the IP address of the recipient. Host names are <em>not</em> allowed for performance reasons. <tt>Port</tt> is the port number at the recipient. </p> <p class="return"> If successful, the method returns 1. In case of error, the method returns <b><tt>nil</tt></b> followed by an error message. </p> <p class="note"> Note: In UDP, the <tt>send</tt> method never blocks and the only way it can fail is if the underlying transport layer refuses to send a message to the specified address (i.e. no interface accepts the address). </p> <!-- setpeername +++++++++++++++++++++++++++++++++++++++++++++++++++++++ --> <p class="name" id="setpeername"> connected:<b>setpeername(</b>'*'<b>)</b><br> unconnected:<b>setpeername(</b>address, port<b>)</b> </p> <p class="description"> Changes the peer of a UDP object. This method turns an unconnected UDP object into a connected UDP object or vice versa. </p> <p class="description"> For connected objects, outgoing datagrams will be sent to the specified peer, and datagrams received from other peers will be discarded by the OS. Connected UDP objects must use the <a href="#send"><tt>send</tt></a> and <a href="#receive"><tt>receive</tt></a> methods instead of <a href="#sendto"><tt>sendto</tt></a> and <a href="#receivefrom"><tt>receivefrom</tt></a>. </p> <p class="parameters"> <tt>Address</tt> can be an IP address or a host name. <tt>Port</tt> is the port number. If <tt>address</tt> is '<tt>*</tt>' and the object is connected, the peer association is removed and the object becomes an unconnected object again. In that case, the <tt>port</tt> argument is ignored. </p> <p class="return"> In case of error the method returns <b><tt>nil</tt></b> followed by an error message. In case of success, the method returns 1. </p> <p class="note"> Note: Since the address of the peer does not have to be passed to and from the OS, the use of connected UDP objects is recommended when the same peer is used for several transmissions and can result in up to 30% performance gains. </p> <p class=note> Note: Starting with LuaSocket 3.0, the host name resolution depends on whether the socket was created by <a href=#socket.udp><tt>socket.udp</tt></a> or <a href=#socket.udp6><tt>socket.udp6</tt></a>. Addresses from the appropriate family are tried in succession until the first success or until the last failure. </p> <!-- setsockname +++++++++++++++++++++++++++++++++++++++++++++++++++++++ --> <p class="name" id="setsockname"> unconnected:<b>setsockname(</b>address, port<b>)</b> </p> <p class="description"> Binds the UDP object to a local address. </p> <p class="parameters"> <tt>Address</tt> can be an IP address or a host name. If <tt>address</tt> is '<tt>*</tt>' the system binds to all local interfaces using the constant <tt>INADDR_ANY</tt>. If <tt>port</tt> is 0, the system chooses an ephemeral port. </p> <p class="return"> If successful, the method returns 1. In case of error, the method returns <b><tt>nil</tt></b> followed by an error message. </p> <p class="note"> Note: This method can only be called before any datagram is sent through the UDP object, and only once. Otherwise, the system automatically binds the object to all local interfaces and chooses an ephemeral port as soon as the first datagram is sent. After the local address is set, either automatically by the system or explicitly by <tt>setsockname</tt>, it cannot be changed. </p> <!-- setoption +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ --> <p class="name" id="setoption"> connected:<b>setoption(</b>option [, value]<b>)</b><br> unconnected:<b>setoption(</b>option [, value]<b>)</b> </p> <p class="description"> Sets options for the UDP object. Options are only needed by low-level or time-critical applications. You should only modify an option if you are sure you need it.</p> <p class="parameters"><tt>Option</tt> is a string with the option name, and <tt>value</tt> depends on the option being set: </p> <ul> <li> '<tt>dontroute</tt>': Indicates that outgoing messages should bypass the standard routing facilities. Receives a boolean value; <li> '<tt>broadcast</tt>': Requests permission to send broadcast datagrams on the socket. Receives a boolean value; <li> '<tt>reuseaddr</tt>': Indicates that the rules used in validating addresses supplied in a <tt>bind()</tt> call should allow reuse of local addresses. Receives a boolean value; <li> '<tt>reuseport</tt>': Allows completely duplicate bindings by multiple processes if they all set '<tt>reuseport</tt>' before binding the port. Receives a boolean value; <li> '<tt>ip-multicast-loop</tt>': Specifies whether or not a copy of an outgoing multicast datagram is delivered to the sending host as long as it is a member of the multicast group. Receives a boolean value; <li> '<tt>ipv6-v6only</tt>': Specifies whether to restrict <tt>inet6</tt> sockets to sending and receiving only IPv6 packets. Receive a boolean value; <li> '<tt>ip-multicast-if</tt>': Sets the interface over which outgoing multicast datagrams are sent. Receives an IP address; <li> '<tt>ip-multicast-ttl</tt>': Sets the Time To Live in the IP header for outgoing multicast datagrams. Receives a number; <li> '<tt>ip-add-membership</tt>': Joins the multicast group specified. Receives a table with fields <tt>multiaddr</tt> and <tt>interface</tt>, each containing an IP address; <li> '<tt>ip-drop-membership</tt>': Leaves the multicast group specified. Receives a table with fields <tt>multiaddr</tt> and <tt>interface</tt>, each containing an IP address. </ul> <p class="return"> The method returns 1 in case of success, or <b><tt>nil</tt></b> followed by an error message otherwise. </p> <p class=note> Note: The descriptions above come from the man pages. </p> <!-- settimeout +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ --> <p class="name" id="settimeout"> connected:<b>settimeout(</b>value<b>)</b><br> unconnected:<b>settimeout(</b>value<b>)</b> </p> <p class="description"> Changes the timeout values for the object. By default, the <a href="#receive"><tt>receive</tt></a> and <a href="#receivefrom"><tt>receivefrom</tt></a> operations are blocking. That is, any call to the methods will block indefinitely, until data arrives. The <tt>settimeout</tt> function defines a limit on the amount of time the functions can block. When a timeout is set and the specified amount of time has elapsed, the affected methods give up and fail with an error code. </p> <p class="parameters"> The amount of time to wait is specified as the <tt>value</tt> parameter, in seconds. The <b><tt>nil</tt></b> timeout <tt>value</tt> allows operations to block indefinitely. Negative timeout values have the same effect. </p> <p class="note"> Note: In UDP, the <a href="#send"><tt>send</tt></a> and <a href="#sentdo"><tt>sendto</tt></a> methods never block (the datagram is just passed to the OS and the call returns immediately). Therefore, the <tt>settimeout</tt> method has no effect on them. </p> <p class="note"> Note: The old <tt>timeout</tt> method is deprecated. The name has been changed for sake of uniformity, since all other method names already contained verbs making their imperative nature obvious. </p> <!-- footer ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ --> <div class=footer> <hr> <center> <p class=bar> <a href="index.html">home</a> &middot; <a href="index.html#download">download</a> &middot; <a href="installation.html">installation</a> &middot; <a href="introduction.html">introduction</a> &middot; <a href="reference.html">reference</a> </p> <p> <small> Last modified by Diego Nehab on <br> Thu Apr 20 00:26:01 EDT 2006 </small> </p> </center> </div> </body> </html>
webs 1.0 - Enhanced UI