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From: "Dave Korn" <dave DOT korn AT artimi DOT com>
To: <cygwin AT cygwin DOT com>
Subject: RE: cygwin + JNI problem with sockets
Date: Thu, 19 Oct 2006 14:09:27 +0100
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On 19 October 2006 05:17, Chandra Sekhar wrote:

> Hi everyone,
> I am a student trying to create a dll of a socket program in cygwin using
> -mno- cygwin as following (after compilation).
>  "gcc -mno-cygwin -shared -o udpServer0.dll udpServer0.o"
> 
> but it throws the following "Errors".
> 
> udpServer0.o:udpServer0.c:(.text+0x41): undefined reference to `_htonl'
> udpServer0.o:udpServer0.c:(.text+0x50): undefined reference to `_htons'
> udpServer0.o:udpServer0.c:(.text+0x70): undefined reference to `_socket'
> udpServer0.o:udpServer0.c:(.text+0x8d): undefined reference to `_bind'
> udpServer0.o:udpServer0.c:(.text+0xb2): undefined reference to `_recv'
> collect2: ld returned 1 exit status

  I think you need to link against the winsock library.  Add "-lws32_2" to the
end of the command line.

> if i create a dll without the "-mno-cygwin" option and call the function in
> the JNI java program, it doesnt execute (doesnt respond, goes to infinite
> loop). But with "-mno-cygwin" option the other programs (other than socket
> programs), they work just fine when called from Java using JNI. Can anyone
> throw in some ideas and suggestions as to where the problem could be or the
> solution if you know. I can post the udpServer0.c if you want me to.

  A win32 program (the java interpreter) can't call a cygwin JNI.  Not
directly, anyway.  Maybe this:

http://elliotth.blogspot.com/2005/08/porting-jni-code-to-win32-with-cygwin.htm
l

could be useful.

    cheers,
      DaveK
-- 
Can't think of a witty .sigline today....


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