This is the mail archive of the
mailing list for the Cygwin project.
RE: cygwin + JNI problem with sockets
- From: "Dave Korn" <dave dot korn at artimi dot com>
- To: <cygwin at cygwin dot com>
- Date: Thu, 19 Oct 2006 14:09:27 +0100
- Subject: RE: cygwin + JNI problem with sockets
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:
could be useful.
Can't think of a witty .sigline today....
Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
Problem reports: http://cygwin.com/problems.html