// mmap example code

// (compile with gcc -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE to
// enable large file support)
// Note that we do not need to use mmap64 once we use these -D options.

 /* large file mmap test */
 #include <unistd.h>
 #include <sys/mman.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>

 int main (int argc, char *argv[])
 {
   int fd;
   char *fpointer;
   struct stat filestat;

   fd=open(argv[1],O_RDONLY);
   perror("open");

   fstat(fd,&filestat);
   perror ("fstat");
   printf ("file is %u bytes long\n",filestat.st_size);

   mmap (0,10000000,PROT_READ, MAP_SHARED,fd,0);
   perror ("mmap");
   return (0);
 }