双有名管道双进程实现通信

create.c创建两个管道文件

#include <myhead.h>
int main(int argc, const char *argv[])
{
	//创建一个有名管道文件
	if(mkfifo("./myfifo1", 0664)==-1)
	{
		perror("mkfifo1 error");
		return 0;
	}

	if(mkfifo("./myfifo2", 0664)==-1)
	{
		perror("mkfifo2 error");
		return 0;
	}
	getchar();

	unlink("myfifo1");
	unlink("myfifo2");
	return 0;
}

snd.c创建一个子进程，主进程发送的同时子进程接收

#include <myhead.h>
int main(int argc, const char *argv[])
{
	pid_t pid = fork();
	if(pid>0)
	{
		char wbuf[128] = "";
		//以只写打开管道文件
		int wfd = open("myfifo1", O_WRONLY);
		if(wfd == -1)
		{
			perror("open error");
			return -1;
		}

		printf("wfd = %d\n", wfd);
		while(1)
		{
			printf("请输入>>>");
			fgets(wbuf, sizeof(wbuf), stdin);   //终端输入字符
			wbuf[strlen(wbuf)-1] = 0;     //'\n'换成'\0'

			//写入管道中
			write(wfd, wbuf, strlen(wbuf));
			printf("发送成功\n");
			if(strcmp(wbuf, "quit")==0)
			{
				break;
			}
		}
	close(wfd);
	}else if(pid == 0)
	{
		char rbuf[128] = "";
		int rfd = open("myfifo2", O_RDONLY);
		if(rfd == -1)
		{
			perror("open error");
			return -1;
		}
		printf("rfd = %d\n", rfd);

		while(1)
		{
			bzero(rbuf, sizeof(rbuf));
			read(rfd, rbuf, sizeof(rbuf));
			printf("收到消息为:%s\n", rbuf);
			if(strcmp(rbuf, "quit") == 0)
			{
				break;
			}
		}
		close(rfd);
	}
	wait(NULL);
	return 0;
}

rec.c创建一个子进程，主进程接收的同时子进程发送

#include <myhead.h>
int main(int argc, const char *argv[])
{
	pid_t pid = fork();
	if(pid > 0)
	{
		char rbuf[128] = "";
		//以只读打开管道文件
		int rfd = open("myfifo1", O_RDONLY);
		if(rfd == -1)
		{
			perror("open error");
			return -1;
		}
		printf("rfd = %d\n", rfd);

		while(1)
		{
			//读取前清空数据
			bzero(rbuf, sizeof(rbuf));
			//从管道文件中读取数据
			read(rfd, rbuf, sizeof(rbuf));
			printf("收到消息为:%s\n", rbuf);
			if(strcmp(rbuf, "quit") == 0)
			{
				break;
			}
		}
	close(rfd);
	}else if(pid == 0)
	{
		char wbuf[128] = "";
		int wfd = open("myfifo2", O_WRONLY);
		if(wfd == -1)
		{
			perror("open error");
			return -1;
		}
		printf("wfd = %d\n", wfd);

		while(1)
		{
			printf("请输入>>>");
			fgets(wbuf, sizeof(wbuf), stdin);   //终端输入字符
			wbuf[strlen(wbuf)-1] = 0;     //'\n'换成'\0'

			write(wfd, wbuf, strlen(wbuf));
			printf("发送成功\n");
			if(strcmp(wbuf, "quit")==0)
			{
				break;
			}
		}
	close(wfd);
	}
	wait(NULL);
	return 0;
}

下为效果图