Mypipe(linux).txt

#include<stdio.h>
#include<unistd.h>
#include<string.h>
#include<sys/wait.h>

int main()
{
    int pipefd[2];
        int ret = pipe(pipefd);
        if(ret==-1)
        {
         perror("pipe");
        // exit(1);                             
        }

        pid_t id = fork();
        if(id==0)
        {//child ,write
            int count = 0;
            int i =0;
            char* sendmsg = NULL;
                close(pipefd[0]);
        while(i<100)
                {
                     sendmsg="Hello Dad !";
                        // printf("i am sendingmsg...");
                     ssize_t ret =  write(pipefd[1],sendmsg,strlen(sendmsg));//  [*]
                         //printf("ret=%d\n",ret);
                     printf("i am sendingmsg,count: %d\n",count++);
                        // sleep(1);
                         i++;
                }
 // close(pipefd[1]);
                return 0;
        }
        else
        {//father
           int status = 0;
           int i=0;
           char buf[30];
          // memset(buf,'\0',sizeof(buf));
           close(pipefd[1]);
           while(i<5)
           {
             memset(buf,'\0',sizeof(buf));
                 int ret  = read(pipefd[0],buf,sizeof(buf));
                // printf("%d\n",ret);
                 printf("%s\n",buf);
                 i++;
           }
           printf("Dad not read from now\n");
           sleep(20);
          // close(pipefd[0]);
         //  pid_t id = wait(&status);
          // if(id > 0)
          // {
          //     printf("child is exit,id:%d,the exit sig :%d\n",id,status&0xff);//[*]     
          // }
          // else
          // {
                //   perror("wait");
          // }
        }
 }