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From: "John Fralinger"<fralinjh AT dca DOT net>
Reply-to: fralinjh AT dca DOT net
To: cygwin AT sourceware DOT cygnus DOT com
Date: Tue, 10 Aug 1999 10:52:19 est
Subject: Simultaneous open of same file under JNI
Message-id: <37b03ca3.585f.0@dca.net>
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The following code demonstrates where System V shared memory
is breaking.

It uses Mumit Khan's JNI example environment.

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <jni.h>
#include "HelloWorld.h"

JNIEXPORT void JNICALL 
Java_HelloWorld_displayHelloWorld (JNIEnv *env, jobject obj) 
{
  char *home;
  int fd;
  char resp[256];

  printf("Java JNI\n");
  home = getenv ("HOME");
  printf("HOME = %s\n", (home) ? home : "(NULL)");
  printf("Enter any existing file name (complete path) to open\n");
  gets( resp );
  if ( ( fd = open( resp, O_RDWR ) ) == -1 )
	  perror( "open failed" );
  printf("Run again from another window BEFORE Enter to exit\n");
  printf("(Use the same file name to demonstrate problem)\n");
  gets( resp );
  return;
}

Shouldn't this work the same way when called from JNI????
When I run 2 of these to the same file I get Permission denied!
John H. Fralinger         |   
SW Contract Engineer      |      1-610-255-5607
Research & Development    |

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