消息的创建，发送和接收 使用系统调用shmget(),sgmat(),smgdt(),shmctl()

#include <stdio.h> 
#include <sys/types.h>
#include <sys/msg.h>
#include <sys/ipc.h>
#define MSGKEY 75          /*定义关键词MEGKEY*/
struct msgform                /*消息结构*/
{
	long mtype;
	char mtexe[100];         /*文本长度*/
}msg;
int msgqid,i;

void CLIENT( )
{
	int i;
	msgqid=msgget(MSGKEY,0777|IPC_CREAT);
	for(i=10;i>=1;i--)
	{
		 msg.mtype=i;
		 printf("(client)sent\n");
 		 msgsnd(msgqid,&msg,1030,0);       /*发送消息msg入msgid消息队列*/
	}
	exit(0);
}

void SERVER( )
{ 
  msgqid=msgget(MSGKEY,0777|IPC_CREAT); /*由关键字获得消息队列*/
  do
  {
	  msgrcv(msgqid,&msg,1030,0,0);  /*从队列msgid接受消息msg*/
	  printf("(server)receive\n");
  }while(msg.mtype!=1);             /*消息类型为1时，释放队列*/
   msgctl(msgqid, IPC_RMID,0);

}

main()
{
  if(fork()) 
{
SERVER();
	  wait(0);

}
	else CLIENT( );

}

结果截图：

 

 

 

#include<sys/types.h>
#include<sys/msg.h>
#include<sys/ipc.h>
#define SHMKEY  75                   /*定义共享区关键词*/
int shmid,i;
int *addr;

 CLIENT()
{	
	int i;	
	shmid=shmget(SHMKEY,1024, 0777|IPC_CREAT);    /*获取共享区，长度1024，关键词SHMKEY*/
	addr=shmat(shmid,0,0);                /*共享区起始地址为addr*/	
	for(i=9;i>=0;i--) 	
	{		
		while(*addr!= -1);                  		
		printf("(client)sent\n");                 /*打印（client）sent*/		
		*addr=i;                             /*把i赋给addr*/	
	}	
	exit(0);
}

 SERVER()
{ 	
	do	
	{	
		while(*addr = =-1);	
		printf("(server)received\n%d",*addr);               /*服务进程使用共享区*/	
if(*addr!=0)
*addr=-1;	
	} while(*addr);	
    wait(0);
	shmctl(shmid,IPC_RMID,0);	
	}

 main()
{	
	shmid=shmget(SHMKEY,1024,0777|IPC_CREAT);  /*创建共享区*/	
	addr=shmat(shmid,0,0);                         /*共享区起始地址为addr*/	
*addr=-1;	
	if(fork())
	{
	 SERVER();	
	}
	else
	{
	 CLIENT();	
	}
 }

 

运行结果：