Linux无名管道编程

无名管道只能用于父子进程间通信，pipe函数用一个数组作参数，数组fd中fd[0]用于读，fd[1]用于写。代码如下：

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

int main(){int pipe1_fd[2], pipe2_fd[2];

char * parent_talks[] = {"Hi, my baby","Can you tell daddy date and time?","Daddy have to leave here, bye!",NULL}; char * child_talks[] = {"Hi, daddy","Sure,","Bye!",NULL};

char parent_buf[256], child_buf[256]; char * parent_ptr, * child_ptr;

int i,j, len; int child_status; time_t curtime;

if(pipe(pipe1_fd) < 0){printf("pipe1 create error/n"); return -1; }

if(pipe(pipe2_fd) < 0) { printf("pipe2 create error/n"); return -1; }

if(fork() == 0) //child { //pipe1_fd[0] is used to read, pipe2_fd[1] is used to write close(pipe1_fd[1]); close(pipe2_fd[0]);

i = 0; child_ptr = child_talks[i]; while(child_ptr != NULL) { len = read(pipe1_fd[0],child_buf,255); child_buf[len] = ‘/0’; printf("Parent: %s/n",child_buf);

if(i == 1) { time(&curtime); len = sprintf(child_buf, "%s %s", child_ptr, ctime(&curtime)); child_buf[len-1] = ‘/0’; write(pipe2_fd[1],child_buf,strlen(child_buf)); } else { write(pipe2_fd[1],child_ptr,strlen(child_ptr)); } child_ptr = child_talks[++i]; }

close(pipe1_fd[0]); close(pipe2_fd[1]); exit(0); } else //parent{ //pipe1_fd[1] is used to write, pipe2_fd[0] is used to read close(pipe1_fd[0]); close(pipe2_fd[1]);

j = 0; parent_ptr = parent_talks[j]; while(parent_ptr != NULL) { write(pipe1_fd[1],parent_ptr,strlen(parent_ptr)); len = read(pipe2_fd[0],parent_buf,255); parent_buf[len] = ‘/0’; printf("Child: %s/n", parent_buf); parent_ptr = parent_talks[++j]; }

close(pipe1_fd[1]); close(pipe2_fd[0]); wait(&child_status); exit(0); }}

而其实你还爱着他，你一点也不好。