#include<sys/types.h>#include<sys/msg.h>#include<sys/ipc.h>#define SHMKEY  75                   /*定義共享區(qū)關(guān)鍵詞*/int shmid,i;int *addr; CLIENT(){		int i;		do{	shmid=shmget(SHMKEY,100,0777); }	while(shmid==-1);	printf("client get shmid=%d\n",shmid);	addr=shmat(shmid,0,0);                /*共享區(qū)起始地址為addr*/		for(i=9;i>=0;i--) 		{				while(*addr!= -1);			printf("(client)sent\n");                 /*打?。╟lient）sent*/				*addr=i;                             /*把i賦給addr*/		}		exit(0);} SERVER(){ 		shmid=shmget(SHMKEY,100,0777|IPC_CREAT);  /*創(chuàng)建共享區(qū)*/		printf("server creat shmid=%d\n",shmid);	addr=shmat(shmid,0,0);                         /*共享區(qū)起始地址為addr*/		do		{			*addr=-1;			while(*addr==-1);			printf("(server)received\n");               /*服務(wù)進(jìn)程使用共享區(qū)*/		} 	while(*addr);		shmctl(shmid,IPC_RMID,0);		exit(0);	} main(){		if(fork())SERVER();		else CLIENT();		wait(0);		wait(0);}