What is the program for echo server using message queues?

Answer 1

// File 1: mesg.h

#include

#include

#include

#include

#define MKEY1 4164L

#define MKEY2 4266L

#define PERMS 0666

typedef struct

{

long mtype;

char mdata[50];

}

mesg;

// File 2: Client.c

#include "mesg1.h"

mesg msg1,msg2;

main()

{

int mq_id1,mq_id2;

int n;

if((mq_id1=msgget(MKEY1,PERMS|IPC_CREAT))<0)

{

printf("Client:error creating queue");

exit(1);

}

if((mq_id2=msgget(MKEY2,PERMS|IPC_CREAT))<0)

{

printf("Client:error creating queue");

exit(1);

}

msg1.mtype=10L;

n=read(0,msg1.mdata,50);

msg1.mdata[n]='\0';

msgsnd(mq_id1,&msg1,50,0);

msgrcv(mq_id2,&msg2,50,10L,0);

write(1,msg2.mdata,50);

}

// File 3: Server.c

#include "mesg1.h"

mesg msg;

main(){

int mq_id1,mq_id2;

int n;if( ( mq_id1=msgget(MKEY1,IPC_CREAT|0666) ) < 0){printf("Server:error openenig queue");exit(1);}msgrcv(mq_id1,&msg,50,10L,0);if((mq_id2=msgget(MKEY2,IPC_CREAT|0666))<0){printf("sender:error creating queue");exit(1);}msgsnd(mq_id2,&msg,50,0);}