小白笔记----pipe管道（2）（dup的用法）

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大概理解了dup的意思，mark一下

/*-------2015/10/24----------*/#include<stdio.h>#include<stdlib.h>#include<sys/types.h>#include<unistd.h>#include<string.h>void pipe_read(int p){char m[100] ;read(p,m,100);printf("that: is what we get:%s\n",m);}void pipe_write(int p){char m[100] = "aaron";write(p,m,strlen(m)+1);}main(int agrc,char **argv[],char * environ){int p;pid_t pid;int pipefd[2];p = pipe(pipefd);pid = fork();if(pid < 0){printf("error\n");}if(pid == 0 ){printf("i am a child process\n");close(0);dup(pipefd[0]);close(pipefd[0]);close(pipefd[1]);pipe_read(0);execv("list2",NULL);//  The  exec() family of functions replaces the current process image witha new process image. exit(0);}if(pid > 0){printf("i am a parent process\n");close(0);dup(pipefd[1]);close(pipefd[1]);close(pipefd[0]);pipe_write(0);wait(NULL);exit(0);}return 0;}

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