A program to show that message may be written by any structure & read in any poiintr in mesage queue

/* RECEIVER */

#include<stdio.h>

#include<stdlib.h>

#include<string.h>

#include<sys/ipc.h>

#include<sys/msg.h>

struct set

{

        unsigned long type;

        unsigned char *pay;

};

        //unsigned char pay[28];

        //unsigned char *pay;

struct set s;

int main()

{

        int i,kid,ret;

        s.pay=malloc(30);//if u r using pointer malloc it..other o/p will not be printed

        kid=msgget(412,666|IPC_CREAT);

        printf("kid=%d\n",kid);

        if(msgrcv(kid,s.pay,28,0,IPC_NOWAIT)==-1)//u may get message directly into s.pay or get into &s with type  (block no.) also..............MESSAGE RCV will return no. of characters received int value....

  {

                printf("message nt rcv\n");

                //goto OUT;

        }

        //printf("msg is rcv succesfully\n");

        //for(i=0;i<100;i++)

        printf("s.payload=%s\n",(s.pay));//printf it

        return 0;

OUT:

        return -1;

}