#include <stdio.h>#include <sys/types.h>#include <sys/msg.h>#include <sys/ipc.h>#define MSGKEY 75struct msgform{long mtype;char mtext[1030];}msg;int msgqid,i;void CLIENT(){int i;msgqid=msgget(MSGKEY,0777);for(i=10;i>=1;i--){msg.mtype=i;msg.mtext[1]='h';msg.mtext[2]='e';msg.mtext[3]='l';msg.mtext[4]='l';msg.mtext[5]='o';printf("(client)sent\n");msgsnd(msgqid,&msg,1024,0);}exit(0);}void SERVER(){msgqid=msgget(MSGKEY,0777|IPC_CREAT);do{msgrcv(msgqid,&msg,1030,0,0);printf("(server)received\n");printf("%c%c%c%c%c\n",msg.mtext[1],msg.mtext[2],msg.mtext[3],msg.mtext[4],msg.mtext[5]);}while(msg.mtype!=1);msgctl(msgqid,IPC_RMID,0);exit(0);}int main(){while((i=fork())==-1);if(!i)SERVER();while((i=fork())==-1);if(!i)CLIENT();wait(0);wait(0);}