作业 10.19

使用消息队列互相通信

#include 
struct msgbuf  
{
	long mtype;            
	char mtext[1024];      
};
#define SIZE sizeof(struct msgbuf)-sizeof(long) 

int main(int argc, const char *argv[])
{
	pid_t cpid=fork();
	if(cpid>0)
	{
		key_t key;
		if((key=ftok("./",'b'))==-1)
		{
			ERR_MSG("ftok");
			return -1;
		}
		int msgid; 
		if((msgid=msgget(key,IPC_CREAT|0664))==-1)
		{
			ERR_MSG("msgget");
			return -1;
		}
		struct msgbuf puin={.mtype=100};
		while(1)
		{
			bzero(puin.mtext,sizeof(puin.mtext));
			printf("请输入：");
			fgets(puin.mtext,SIZE,stdin);
			puin.mtext[strlen(puin.mtext)-1]='\0';
			msgsnd(msgid,&puin,SIZE,0);
			if(strcmp(puin.mtext,"quit")==0)
			{
				break;
			}
		}
		if(msgctl(msgid,IPC_RMID,NULL)==-1)
		{
			ERR_MSG("msgctl");
			return -1;
		}

	}
	else if(cpid==0)
	{
		key_t key;
		if((key=ftok("./",'a'))==-1)
		{
			ERR_MSG("ftok");
			return -1;
		}
		int msgid; 
		if((msgid=msgget(key,IPC_CREAT|0664))==-1)
		{
			ERR_MSG("msgget");
			return -1;
		}
		
		struct msgbuf puin;
		while(1)
		{
			bzero(puin.mtext,sizeof(puin.mtext));
			msgrcv(msgid,&puin,SIZE,0,0);
			printf("message:%s\n",puin.mtext);

		}
		exit(0);
	}
	else if(cpid<0)
	{
		ERR_MSG("fork");
		return -1;
	}
	wait(NULL);
	return 0;
}
#include 
struct msgbuf  
{
	long mtype;            
	char mtext[1024];      
};
#define SIZE sizeof(struct msgbuf)-sizeof(long) 

int main(int argc, const char *argv[])
{
	pid_t cpid=fork();
	if(cpid>0)
	{
		key_t key;
		if((key=ftok("./",'a'))==-1)
		{
			ERR_MSG("ftok");
			return -1;
		}
		int msgid; 
		if((msgid=msgget(key,IPC_CREAT|0664))==-1)
		{
			ERR_MSG("msgget");
			return -1;
		}
		struct msgbuf puin={.mtype=100};
		while(1)
		{
			bzero(puin.mtext,sizeof(puin.mtext));
			printf("请输入：");
			fgets(puin.mtext,SIZE,stdin);
			puin.mtext[strlen(puin.mtext)-1]='\0';
			msgsnd(msgid,&puin,SIZE,0);
			if(strcmp(puin.mtext,"quit")==0)
			{
				break;
			}
		}
		if(msgctl(msgid,IPC_RMID,NULL)==-1)
		{
			ERR_MSG("msgctl");
			return -1;
		}

	}
	else if(cpid==0)
	{
		key_t key;
		if((key=ftok("./",'b'))==-1)
		{
			ERR_MSG("ftok");
			return -1;
		}
		int msgid; 
		if((msgid=msgget(key,IPC_CREAT|0664))==-1)
		{
			ERR_MSG("msgget");
			return -1;
		}
		
		struct msgbuf puin;
		while(1)
		{
			bzero(puin.mtext,sizeof(puin.mtext));
			msgrcv(msgid,&puin,SIZE,0,0);
			printf("message:%s\n",puin.mtext);

		}
		exit(0);
	}
	else if(cpid<0)
	{
		ERR_MSG("fork");
		return -1;
	}
	wait(NULL);
	return 0;
}