进程间通信：采用有名管道，创建两个发送接收端，父进程写入管道1和管道2，子进程读取管道2和管道1.

作业1：有名管道，创建两个发送接收端，父进程写入管道1和管道2，子进程读取管道2和管道1.

 

右进程 

#include <myhead.h>
int main(int argc, const char *argv[])
{pid_t pid=fork();if(pid>0)//父进程，将数据发送至管道1{int fd1;int len;char buff[1024];fd1=open("./fifo_a",O_WRONLY);if(fd1==-1){perror("打开管道1");return -1;}while(1){len=read(0,buff,sizeof(buff));//从键盘读取数据buff[strlen(buff)-1] = '\0';write(fd1,buff,len);//将数据发送至管道1if(strcmp(buff,"quit")==0){break;}}close(fd1);}else if(pid==0){int fd2;int len1;char buff1[1024];fd2=open("./fifo_b",O_RDONLY);if(fd2==-1){perror("打开管道2");return -1;}while(1){len1=read(fd2,buff1,sizeof(buff1));//从管道2读取数据write(1,buff1,len1);if(strcmp(buff1,"quit")==0){break;}}close(fd2);}else{perror("pid");return -1;}return 0;
}

左进程 

#include <myhead.h>
int main(int argc, const char *argv[])
{pid_t pid=fork();if(pid>0)//父进程，将数据发送至管道1{int fd1;int len;char buff[1024];fd1=open("./fifo_b",O_WRONLY);if(fd1==-1){perror("打开管道1");return -1;}while(1){len=read(0,buff,sizeof(buff));//从键盘读取数据buff[len-1] = '\0';write(fd1,buff,len);//将数据发送至管道1if(strcmp(buff,"quit")==0){break;}}close(fd1);}else if(pid==0){int fd2;int len1;char buff1[1024];fd2=open("./fifo_a",O_RDONLY);if(fd2==-1){perror("打开管道2");return -1;}while(1){len1=read(fd2,buff1,sizeof(buff1));//从管道2读取数据write(1,buff1,len1);if(strcmp(buff1,"quit")==0){break;}}close(fd2);}else{perror("pid");return -1;}return 0;
}