Name: md23716			Date: 02/26/2001

HotSpot aborts if a signal handler has been installed previously.  This is
a regression from JDK 1.1.8.

Testcase:


     Testcase source code (sig_test.c):

          #include <jni.h>
          #include <stdio.h>
          #include <signal.h>
          #include <ucontext.h>

          static JavaVMOption VM_OPTIONS[] = {
              {"-Xmx16m", NULL},
              {"-Djava.class.path=.", NULL},
          /*
              {"-XX:+AllowUserSignalHandlers", NULL},
          */
          };
          static const N_VM_OPTIONS = (sizeof(VM_OPTIONS)) /
(sizeof(JavaVMOption));

          void start_jni(void)
          {
              JNIEnv *env;
              JavaVM *jvm;
              JavaVMInitArgs vm_args;

              jint res;

              vm_args.version = JNI_VERSION_1_2;
              vm_args.options = VM_OPTIONS;
              vm_args.nOptions = N_VM_OPTIONS;
              vm_args.ignoreUnrecognized = JNI_FALSE;

              fprintf(stderr, "About to create JVM\n");

              res = JNI_CreateJavaVM(&jvm,(void**) &env, &vm_args);

              if (res < 0)
              {
                  fprintf(stderr, "Can't create Java VM\n");
                  exit(1);
              }

              fprintf(stderr, "About to delete JVM\n");

              (*jvm)->DestroyJavaVM(jvm);

              fprintf(stderr, "About to exit\n");
          }

          void sig_handler(int sig, siginfo_t *sip, void *uap)
          {
              char sigstr[4 + SIG2STR_MAX] = "SIG";
              char *errstr;

              sig2str(sig, sigstr+3);

              if (sip)
              {
                  psiginfo(sip, sigstr);
                  errstr = (sip->si_errno ? (char *)strerror(sip->si_errno)
 : "NONE");
                  fprintf(stderr, "errno: %s [%i]\n", errstr, sip->si_errno);
              }
              else
              {
                  psignal(sig, sigstr);
              }

              exit(1);
          }

          void add_handler(int sig)
          {
              struct sigaction act, oact;

              act.sa_handler = 0;
              act.sa_sigaction = sig_handler;
              sigemptyset(&act.sa_mask);
              act.sa_flags = SA_SIGINFO;

              sigaction(sig, &act, &oact);
          }

          int main(int argc, char *argv[])
          {
              int sig;
              const char *sigstr = (argc > 1 ? argv[1] : "");

              if (strcmp(sigstr, "") != 0)
              {
                  if (strncmp(sigstr, "SIG", 3) == 0)
                  {
                      sigstr += 3;
                  }

                  if (str2sig(sigstr, &sig) == 0)
                  {
                      add_handler(sig);
                  }
                  else
                  {
                      fprintf(stderr, "Unknown signal: %s\n", sigstr);
                  }
              }

              start_jni();

              return 0;
          }

     Testcase shell script (SigTest.sh):

          #!/bin/sh

          INC="-I${JAVA_HOME}/include -I${JAVA_HOME}/include/solaris"
          LIB="-L${JAVA_HOME}/jre/lib/sparc"

          cc -mt ${INC} ${LIB} -o sig_test sig_test.c -ljvm
          truss -aelf -o truss.out ./sig_test $*

     Usage:

          ./SigTest.sh <signal name>

     Fails for:

          ./SigTest.sh SIGILL
          ./SigTest.sh SIGFPE
          ./SigTest.sh SIGBUS
          ./SigTest.sh SIGSEGV
          ./SigTest.sh SIGPIPE
          ./SigTest.sh SIGUSR1

     Failure Output:

          About to create JVM
          #
          # HotSpot Virtual Machine Error, Internal Error
          # Please report this error at
          # http://java.sun.com/cgi-bin/bugreport.cgi
          #
          [error occured during error reporting]



======================================================================
gary.collins@East 2001-02-26