Use strace -f -e trace=file <program>
to see what file activity there is. Also make sure that your library is actually being found with ldd <program> (Looks like it is.) --- Vladimir -------- Vladimir G. Ivanovic http://leonora.org/~vladimir 2770 Cowper St. [EMAIL PROTECTED] Palo Alto, CA 94306-2447 +1 650 678 8014 "WQ" == William Quan <William> writes: WQ> This message is in MIME format. Since your mail reader does not understand WQ> this format, some or all of this message may not be legible. WQ> ------_=_NextPart_001_01C1ECB0.FB7C9690 WQ> Content-Type: text/plain; WQ> charset="iso-8859-1" WQ> Juergen, WQ> Thanks for your help. WQ> The LD_DEBUG shows the following: WQ> 31212: symbol=putpmsg; lookup in file=/lib/libc.so.6 WQ> 31212: binding file /home/imslab/jets1000dev/dlpi/libdlpi.so to WQ> /lib/libc.so.6: symbol `putpmsg' WQ> do_attach: put_msg(): Function not implemented WQ> This is exactly as predicted. WQ> However, when I attempt to do the command: 'LD_PRELOAD=/usr/lib/libLiS.so WQ> ... java' WQ> The process hangs(long pause and no sign of completion in sight)- so i kill WQ> the process. WQ> Q3.)Any ideas as to what might be the cause for this hangup using WQ> LD_PRELOAD? WQ> Q4.)How do I build my own startup program for the linux JVM, linked against WQ> libLiS.so ?? WQ> This sounds like I need to rebuild the java executable? Am I understanding WQ> you correctly? WQ> -----Original Message----- WQ> From: Juergen Kreileder [mailto:[EMAIL PROTECTED]] WQ> Sent: Thursday, April 25, 2002 4:37 PM WQ> To: Quan, William [NGC:B866:EXCH] WQ> Cc: '[EMAIL PROTECTED]' WQ> Subject: Re: Linux JVM: JNI allow putmsg() syscalls in native code? WQ> William Quan <[EMAIL PROTECTED]> writes: >> Q1.) Why is the JVM eclipsing my getmsg() and putmsg() syscalls with >> this from libc? WQ> This not Java specific, you'll get the same problem when dlopening a WQ> library which is linked against libLiS.so. The first getmsg which WQ> gets found is from libc. WQ> If you set LD_DEBUG=symbols,bindings you can see what's happening. WQ> (E.g. "LD_DEBUG=symbols,bindings java ... 2>&1 | grep getmsg") WQ> In order to get getmsg() from libLiS.so you either have to set WQ> LD_PRELOAD=libLiS.so or create a new startup program (which you'll use WQ> instead of "java") that is linked with libLiS.so. >> Q2.) Does the following restriction apply to the linux 1.3.1 (native >> threads)? WQ> No, the restriction only applies to the green threads VM. WQ> Juergen WQ> -- WQ> Juergen Kreileder, Blackdown Java-Linux Team WQ> http://www.blackdown.org/java-linux.html WQ> Run Java 2 SE v1.3.1 on your iPAQ: WQ> http://www.handhelds.org/pipermail/ipaq/2001-June/007221.html WQ> ------_=_NextPart_001_01C1ECB0.FB7C9690 WQ> Content-Type: text/html; WQ> charset="iso-8859-1" WQ> Content-Transfer-Encoding: quoted-printable WQ> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> WQ> <HTML> WQ> <HEAD> WQ> <META HTTP-EQUIV=3D"Content-Type" CONTENT=3D"text/html; = WQ> charset=3Diso-8859-1"> WQ> <META NAME=3D"Generator" CONTENT=3D"MS Exchange Server version = WQ> 5.5.2654.89"> WQ> <TITLE>RE: Linux JVM: JNI allow putmsg() syscalls in native = WQ> code?</TITLE> WQ> </HEAD> WQ> <BODY> WQ> <P><FONT SIZE=3D2>Juergen,</FONT> WQ> <BR><FONT SIZE=3D2>Thanks for your help. </FONT> WQ> </P> WQ> <P><FONT SIZE=3D2>The LD_DEBUG shows the following:</FONT> WQ> <BR> <FONT = WQ> SIZE=3D2>31212: symbol=3Dputpmsg; lookup in = WQ> file=3D/lib/libc.so.6</FONT> WQ> <BR> <FONT = WQ> SIZE=3D2>31212: binding file = WQ> /home/imslab/jets1000dev/dlpi/libdlpi.so to /lib/libc.so.6: symbol = WQ> `putpmsg'</FONT> WQ> <BR> <FONT = WQ> SIZE=3D2>do_attach: put_msg(): Function not implemented</FONT> WQ> <BR><FONT SIZE=3D2>This is exactly as predicted. </FONT> WQ> </P> WQ> <P><FONT SIZE=3D2>However, when I attempt to do the command: = WQ> 'LD_PRELOAD=3D/usr/lib/libLiS.so ... java'</FONT> WQ> <BR><FONT SIZE=3D2>The process hangs(long pause and no sign of = WQ> completion in sight)- so i kill the process.</FONT> WQ> <BR><FONT SIZE=3D2>Q3.)Any ideas as to what might be the cause for this = WQ> hangup using LD_PRELOAD?</FONT> WQ> </P> WQ> <P><FONT SIZE=3D2>Q4.)How do I build my own startup program for the = WQ> linux JVM, linked against libLiS.so ??</FONT> WQ> <BR><FONT SIZE=3D2>This sounds like I need to rebuild the java = WQ> executable? Am I understanding you correctly?</FONT> WQ> </P> WQ> <BR> WQ> <P><FONT SIZE=3D2>-----Original Message-----</FONT> WQ> <BR><FONT SIZE=3D2>From: Juergen Kreileder [<A = WQ> HREF=3D"mailto:[EMAIL PROTECTED]";>mailto:[EMAIL PROTECTED]</A>]</FONT> WQ> <BR><FONT SIZE=3D2>Sent: Thursday, April 25, 2002 4:37 PM</FONT> WQ> <BR><FONT SIZE=3D2>To: Quan, William [NGC:B866:EXCH]</FONT> WQ> <BR><FONT SIZE=3D2>Cc: '[EMAIL PROTECTED]'</FONT> WQ> <BR><FONT SIZE=3D2>Subject: Re: Linux JVM: JNI allow putmsg() syscalls = WQ> in native code?</FONT> WQ> </P> WQ> <BR> WQ> <P><FONT SIZE=3D2>William Quan <[EMAIL PROTECTED]> = WQ> writes:</FONT> WQ> </P> WQ> <P><FONT SIZE=3D2>> Q1.) Why is the JVM eclipsing my getmsg() and = WQ> putmsg() syscalls with</FONT> WQ> <BR><FONT SIZE=3D2>> this from libc?</FONT> WQ> </P> WQ> <P><FONT SIZE=3D2>This not Java specific, you'll get the same problem = WQ> when dlopening a</FONT> WQ> <BR><FONT SIZE=3D2>library which is linked against libLiS.so. The = WQ> first getmsg which</FONT> WQ> <BR><FONT SIZE=3D2>gets found is from libc.</FONT> WQ> <BR><FONT SIZE=3D2>If you set LD_DEBUG=3Dsymbols,bindings you can see = WQ> what's happening.</FONT> WQ> <BR><FONT SIZE=3D2>(E.g. "LD_DEBUG=3Dsymbols,bindings java ... = WQ> 2>&1 | grep getmsg")</FONT> WQ> </P> WQ> <P><FONT SIZE=3D2>In order to get getmsg() from libLiS.so you either = WQ> have to set</FONT> WQ> <BR><FONT SIZE=3D2>LD_PRELOAD=3DlibLiS.so or create a new startup = WQ> program (which you'll use</FONT> WQ> <BR><FONT SIZE=3D2>instead of "java") that is linked with = WQ> libLiS.so.</FONT> WQ> </P> WQ> <P><FONT SIZE=3D2>> Q2.) Does the following restriction apply to the = WQ> linux 1.3.1 (native</FONT> WQ> <BR><FONT SIZE=3D2>> threads)?</FONT> WQ> </P> WQ> <P><FONT SIZE=3D2>No, the restriction only applies to the green threads = WQ> VM. </FONT> WQ> </P> WQ> <BR> WQ> <P><FONT SIZE=3D2> = WQ> Juergen</FONT> WQ> </P> WQ> <P><FONT SIZE=3D2>-- </FONT> WQ> <BR><FONT SIZE=3D2>Juergen Kreileder, Blackdown Java-Linux Team</FONT> WQ> <BR><FONT SIZE=3D2><A HREF=3D"http://www.blackdown.org/java-linux.html"; = WQ> TARGET=3D"_blank">http://www.blackdown.org/java-linux.html</A></FONT> WQ> <BR><FONT SIZE=3D2>Run Java 2 SE v1.3.1 on your iPAQ:</FONT> WQ> <BR><FONT SIZE=3D2><A = WQ> HREF=3D"http://www.handhelds.org/pipermail/ipaq/2001-June/007221.html"; = WQ> TARGET=3D"_blank">http://www.handhelds.org/pipermail/ipaq/2001-June/0072= WQ> 21.html</A></FONT> WQ> </P> WQ> </BODY> WQ> </HTML> WQ> ------_=_NextPart_001_01C1ECB0.FB7C9690-- WQ> ---------------------------------------------------------------------- WQ> To UNSUBSCRIBE, email to [EMAIL PROTECTED] WQ> with a subject of "unsubscribe". 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