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Forum => newLISP in the real world => Topic started by: newdep on February 28, 2004, 03:34:46 AM

Title: Enhancement in UDP for newlisp [ broadcast ]
Post by: newdep on February 28, 2004, 03:34:46 AM
Hello Lutz,



Is it an Idea to enhance the UDP functionality with SO_BROADCAST ?

The setsockopt needs an #SO_BROADCAST $0020 and a #SOL_SOCKET $FFFF in that case and a newllist function like net-broadcast-udp ( int-socket ) will enable/disable broadcast on the UDP socket. I had a look in your great C code but did not dare to touch it myself ;-)



* just tried it but got stuck ;-)



Regards, Norman.
Title:
Post by: Lutz on March 01, 2004, 05:14:42 AM
Sounds like a good idea, I will give it a try.



Lutz
Title:
Post by: newdep on March 01, 2004, 08:03:11 AM
Hello Lutz,



Add-on, for the use of broadcast it should be able to be enabled on both

sending and receiving on udp.. Would be great to have it...



Regards, Norman.
Title:
Post by: Lutz on March 01, 2004, 08:40:09 AM
Hi Norman,



just finished implementing an additional parameter for 'net-listen'



example:



(net-listen 1234 "192.168.0.5") ;; or name for IP



Unfortunately I don't have a computer with two net work cards, but the code was streight forward enough that I think it will work. The version will go up with a couple of other changes/fixes as 7.5.5 in a couple of days.



Regarding the broadcast thing for UDP I am not shure what to specify for SO_BROADCAST boolean

  char * optval

  int * oplen



On UNIX man pages I read that a non-zero int value would be specified for boolean TRUE (not int * ), but what about int * oplen? just NULL ?



setsockopt(mysocket, SOL_SOCKET, SO_BROADCAST, 1, NULL) ?



Lutz
Title:
Post by: newdep on March 01, 2004, 09:00:50 AM
Hello Lutz,



for the setsockopt i use this,



setsockopt(mysocket, SOL_SOCKET, SO_BROADCAST, 1)



The optlen is optional and will be NULL when not provided using setsockopt automaticly, for getsockopt i though it returns the Buffer lenght from optvalue. The option optval it is indeed Non-Zero (1) to enable it and Zero to disable it.



Regards, Norman.
Title:
Post by: newdep on March 01, 2004, 09:05:45 AM
Hello Lutz,



A little tip on the (net-listen 1234 "192.168.0.5")



Could you perhpas turn it around like: (net-listen "192.168.168.1" 1234) ?



Ill see My other machine are up and running for newlisp, i could test

the code for you, no problem.



Norman.
Title:
Post by: Lutz on March 01, 2004, 09:27:47 AM
>>>>>

Could you perhpas turn it around like: (net-listen "192.168.168.1" 1234) ?

>>>>>



this would break compatibility with previous code, also the additional address is an optional parameter which doesn't need to be specified, so it is better having it at the end.



thanks for the SO_BROADCAST clarification



Lutz
Title:
Post by: newdep on March 01, 2004, 01:50:56 PM
followup from "Warning" in lisp general...





Im testing here between win2000 and linux and between linux linux but

nothing

happens I think its between your Windows version where it could be enabled on one of them, on Win98 the setsockopt need the extra NULL at the end i think because win98 is slighty different on Sockets...



Norman.
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