X-Spam-Check-By: sourceware.org From: "Dave Korn" To: Subject: RE: cygwin + JNI problem with sockets Date: Thu, 19 Oct 2006 14:09:27 +0100 Message-ID: <02ac01c6f37f$ce414ce0$a501a8c0@CAM.ARTIMI.COM> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook 11 In-Reply-To: Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Delivered-To: mailing list cygwin@cygwin.com 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.... -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/