#include <sys/io.h>

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

#include <stdlib.h>
#include <string.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <sys/sem.h>




int main(int argc, char *argv[])
{

 int key;
 int msize;
 char *shm;
 int shmid,  count=0;

  if(argc==3)
  {
    key=atol(argv[1]);
   printf("key=%d\n",key);
    msize=atoi(argv[2]);
    printf("Size=%d\n",msize);
  }
  else
  {
   printf("Not enough args\n"); exit(-1);
  }


// connect to the shared memory

shmid = shmget(key,msize ,0666);


        if(shmid < 0)
        {
                perror("shmwrite error1");
                return 1;
        }


        shm = (char *)shmat(shmid, NULL, 0);

        if(shm == NULL)
        {
                perror("shmwrite error2");
                return 1;
        }



 shm[0]=0;
 printf("Trying to send data\n");

 // Display the contents of common RAM as written by perl
 for(count=0;count<msize;count++)
 {
  printf("%x,",shm[count]);
 }
 printf("\n\n");

 for(count=16;count<msize;count++)
 {
   printf("%c,",shm[count]);
 }
  printf("\n\n");


 char *ken;
 ken=&shm[16];


 printf("jac=%d\n",atoi(ken));



// Destroy the common RAM if perl doesnt do it for you by undefing its shared ram object
// shmdt(shm);     /* Detach from process space */
// shmctl(shmid, IPC_RMID, NULL);  /* remove shared memory segment from system */
// semctl(semid, IPC_RMID, 0); /* remove semaphore */


return(0);
}

//

/*
Format starting from the first byte of shared memory when the memory contains '9876' (in hex)
Note that all variables are kept as text!

00
FF
FF
FF
04   The number of character in the variable including the decimal point character (if one exists)
00
00
00
01
00
00
00
02
00
00
00
39  Byte 16 is the start of the integer value, or string or float which is expressed as the string 9.876e-08
38
37
36
00  and all zerooes to the end of the common area



Only the fifth byte seems to change even if the format of the data changes

*/