Message queue IPC example in C

//message queue server
#include<stdio.h>
#include<unistd.h>
#include<fcntl.h>
#include<sys/types.h>
#include<sys/ipc.h>
#include<sys/msg.h>
#include<sys/stat.h>
#include<string.h>
#define KEY 500
struct msg
{
 long int msgtype;
 char msgfromclient[1024];
 int pid;
}msgbuf;

int main()
{
 int mqid,n,fd,m1;
 mqid=msgget(KEY,0666|IPC_CREAT);
 while(1)
 {
 msgrcv(mqid,&msgbuf,sizeof(msgbuf),1,0);
 printf("Filename from client %s\n",msgbuf.msgfromclient);

//sending requested file data to client
 fd=open(msgbuf.msgfromclient,O_RDONLY);
 n=read(fd,msgbuf.msgfromclient,1024);
 msgbuf.msgtype=msgbuf.pid;
 msgbuf.pid=getpid();
 msgsnd(mqid,&msgbuf,sizeof(msgbuf),0);
 }
return 0;
}
//client
#include<stdio.h>
#include<unistd.h>
#include<fcntl.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<string.h>
#define KEY 500

struct msg
{
 long int type;
 char a[1024];
 int pid;
}p,p1;
int main()
{
 int m;
 m=msgget(KEY,0);
//fill the structure to send data
 p.type=1;
 printf("\nEnter the msg");
 scanf("%s",&p.a);
 pid_t pid;
 p.pid=getpid();
 msgsnd(m,&p,sizeof(p),0);
 msgrcv(m,&p1,sizeof(p),p.pid,0);
 printf("%s",p1.a);
return 0;
}

//output:
ServerTerminal$ ./server
ClientTerminal$ ./client
Enter the msg hello.txt

ServerTerminal$ 
Filename from client hello
ClientTerminal$ ./client
contents of hello.txt