Programming

#include<stdio.h>
#include<stdlib.h>
#include<sys/types.h>
#include<unistd.h>
#include<sys/msg.h>

#define key 121121
#define max 20
typedef struct {
	long type;
	char data[max];
	}message;

message mex;

int main(){

int i,n;
int father;
char stringaint[max];

mex.type=357;
int idqueue=msgget(key,IPC_CREAT |0600);

for(i=0;i<3;i++){
          father=fork();
          if(!father){
	   sprintf(stringaint,"%d",getpid());
    	   strcpy(mex.dato,stringaint);
	   printf("The son will send the data with his PID: %s\n",mex.data);
	   if(msgsnd(idqueue,&mex,sizeof(message),0)==-1) 
                         printf("It's not working!");

	   if(msgrcv(idqueue,&mex,sizeof(message),getpid(),0)==-1)
		printf("\nMessage not received\n");
	   else 
	             printf("\nMessage received");
	   i=3;
	}
}
for (i=0; i<3; i++)
      wait(0);
//Without this part the program works (but I need to remove the queue!)
msgctl(idcoda,IPC_RMID,0);
//
}

#include<stdio.h>
#include<stdlib.h>
#include<sys/types.h>
#include<unistd.h>
#include<sys/msg.h>

#define key 121121
#define max 20

typedef struct {
	long type;
	char data[max];
	}message;


int main(){
int i;
int father;
char str[80];
messaggio temp;
int idqueue=msgget(key,IPC_CREAT |0600);


for(i=0;i<3;i++){
      father=fork();
      if(!father){
      if(msgrcv(idqueue,&temp,sizeof(message),0,0)==-1)
	printf("\nB hasn't received the message from A\n");	
      else 
	printf("\nB has received the message from A");

      temp.type=atoi(temp.data); 
      printf("\n%d\n", temp.type);
			
      strcat(temp.dato," ADD");
      printf("%s\n",temp.data);


      if(msgsnd(idqueue,&(temp),sizeof(message),0)==-1)
	printf("\nNot working!!");
      i=3;
      }
	
} 
}