Hi,
I have a problem under Linux loading the JVM since before I set a Handler to
catch SIGSEGV signals. It seems that this causes some troubles when the JVM
is loaded. This seems due to threads in Java. I saw several post from
yourself about this topic.
I include my C test file (called x.c) and the command-line
to compile it is:
gcc -o x /usr/java/jdk1.3/jre/lib/i386/client/libjvm.so x.c
-I/usr/java/jdk1.3/include -I/usr/java/jdk1.3/include/linux -g -Wall
(assuming the JDK is installed in /usr/java/jdk1.3)
Here is the C file
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <jni.h>
JNIEnv *env;
JavaVM *vm;
jclass cls;
void
Load_JVM(void)
{
JavaVMOption options[2];
JavaVMInitArgs vm_args;
options[0].optionString = "-Djava.class.path=."; /* user classes */
vm_args.version = JNI_VERSION_1_2;
vm_args.options = options;
vm_args.nOptions = 1;
vm_args.ignoreUnrecognized = 1;
printf("READY TO LOAD THE JVM\n");
if (JNI_CreateJavaVM(&vm, (void **)&env, (void *)&vm_args) < 0)
{
fprintf(stderr, "cannot load the JVM\n");
exit(1);
}
printf("JVM LOADED\n");
}
void
SIGSEGV_Handler(void)
{
fprintf(stderr, "Received SIGSEGV\n");
exit(2);
}
int
main(int argc, char *argv[])
{
signal(SIGSEGV, (void (*)()) SIGSEGV_Handler);
Load_JVM();
return 0;
}
It simply installs a handler for SIGSEGV and then loads the JVM. If you
comment the line signal(SIGSEGV, (void (*)()) SIGSEGV_Handler) in the main(),
this works properly but with the handler this crashes with:
READY TO LOAD THE JVM
#
# HotSpot Virtual Machine Error, Internal Error
# Please report this error at
# http://java.sun.com/cgi-bin/bugreport.cgi
#
# Error ID: 4F533F4C494E55580E4350500570
#
# Problematic Thread: Received SIGSEGV
Another strange problem occurs if you replace this line by
system("uname -a");
after executing system() the JVM loading is blocked (in a sigsuspend I think).
Could you help me on this please ?
--
===============================================
Daniel Diaz
University of Paris 1 INRIA Rocquencourt
75013 Paris FRANCE 78153 Le Chesnay FRANCE
web: http://pauillac.inria.fr/~diaz
email: [EMAIL PROTECTED]
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