两个进程间的通信

最新推荐文章于 2025-02-22 19:38:25 发布

weixin_42720729

最新推荐文章于 2025-02-22 19:38:25 发布

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本文链接：https://blog.youkuaiyun.com/weixin_42720729/article/details/81784030

#include <stdio.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>

#define MSGKEY   1234

struct msgbuf {
	long mtype;     /* message type, must be > 0 */
	char mtext[64];  /* message data */
};

int main()
{
	struct msgbuf mbuf;
	int ret;

	int msgid = msgget(MSGKEY, IPC_CREAT | IPC_EXCL);
	if (-1 == msgid)
	{
		perror("msgget");
		exit(1);
	}

	pid_t pid = fork();
	if (-1 == pid)
	{
		perror("fork");
		exit(1);
	}
	else if (0 == pid)    //子进程发送
	{
		while (1)
		{
			memset(&mbuf, 0, sizeof(mbuf));
	
			mbuf.mtype = 1;   //消息类型
			scanf("%s", mbuf.mtext);

			ret = msgsnd(msgid, &mbuf, sizeof(mbuf.mtext), 0);
			if (-1 == ret)
			{
				perror("msgsnd");
				exit(1);
			}

			if (!strcmp(mbuf.mtext, "bye"))
			{
				mbuf.mtype = 2;
				msgsnd(msgid, &mbuf, sizeof(mbuf.mtext), 0);
				break;
			}
		}
	}
	else                 //父进程接收
	{
		while (1)
		{
			memset(&mbuf, 0, sizeof(mbuf));
		
			ret = msgrcv(msgid, &mbuf, sizeof(mbuf.mtext), 2, 0);
			if (-1 == ret)
			{
				perror("msgrcv");
				exit(1);
			}

			if (!strcmp(mbuf.mtext, "bye"))
			{	
				kill(pid, 2);
				break;
			}
			
			printf("\t\t\t%s\n", mbuf.mtext);

			memset(&mbuf, 0, sizeof(mbuf));
		}
	}

	sleep(1);
	msgctl(msgid, IPC_RMID, NULL);

	return 0;
}

#include <stdio.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>

#define MSGKEY   1234

struct msgbuf {
	long mtype;     /* message type, must be > 0 */
	char mtext[64];  /* message data */
};

int main()
{
	struct msgbuf mbuf;
	int ret;

	int msgid = msgget(MSGKEY, 0);
	if (-1 == msgid)
	{
		perror("msgget");
		exit(1);
	}

	pid_t pid = fork();
	if (-1 == pid)
	{
		perror("fork");
		exit(1);
	}
	else if (0 == pid)    //子进程发送
	{
		while (1)
		{
			memset(&mbuf, 0, sizeof(mbuf));
	
			mbuf.mtype = 2;   //消息类型
			scanf("%s", mbuf.mtext);

			ret = msgsnd(msgid, &mbuf, sizeof(mbuf.mtext), 0);
			if (-1 == ret)
			{
				perror("msgsnd");
				exit(1);
			}

			if (!strcmp(mbuf.mtext, "bye"))
			{
				mbuf.mtype = 1;
				msgsnd(msgid, &mbuf, sizeof(mbuf.mtext), 0);
				break;
			}
		}
	}
	else                 //父进程接收
	{
		while (1)
		{
			memset(&mbuf, 0, sizeof(mbuf));
		
			ret = msgrcv(msgid, &mbuf, sizeof(mbuf.mtext), 1, 0);
			if (-1 == ret)
			{
				perror("msgrcv");
				exit(1);
			}

			if (!strcmp(mbuf.mtext, "bye"))
			{
				kill(pid, 2);
				break;
			}
			
			printf("\t\t\t%s\n", mbuf.mtext);

			memset(&mbuf, 0, sizeof(mbuf));
		}
	}

	return 0;
}