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Date: Wed, 29 Aug 2001 17:47:33 +0200
From: Kenneth Johansson <kenneth.johansson@inn.ericsson.se>
Subject: Problem with mmap
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Here is a program that works on ext2 but not on jffs2.


-- 
Kenneth Johansson	
Ericsson Business Innovation AB   Tel: +46 8 404 71 83
Viderögatan 3                     Fax: +46 8 404 72 72
164 80 Stockholm                  kenneth.johansson@inn.ericsson.se

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#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#include <stdio.h>
#include <string.h>

static const char *file = "mmap_file";
#define FILE_SIZE 8192

int main ()
{
   int i,fd;
   unsigned char *map;

   if ((fd = open ("mmap_file",O_RDWR|O_CREAT)) < 0) {
       printf("Could not open file %s\n",file);
       perror (NULL);
       exit (1);
   }

    map = mmap (NULL,
	       FILE_SIZE,
	       PROT_READ | PROT_WRITE,
	       MAP_SHARED,
	       fd,
	       0);

   if (map == MAP_FAILED){
       printf("Could not mmap file %s\n",file);
       perror (NULL);
       exit (1);
   }
   
   printf("mmap of file %s OK\n",file);

   munmap (map,FILE_SIZE);
   close (fd);
   exit (0);
}


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