C.匿名管道

#include<unistd.h>
#include<sys/types.h>
#include<errno.h>
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
int main()
{
	int pipe_fd[2];
	pid_t pid;
	char buf_r[100];
	char* p_wbuf;
	memset(buf_r,0,sizeof(buf_r));	
	if(pipe(pipe_fd)<0)
	{	
		printf("pipe create error\n");
		return -1;
	}	
	
	if((pid=fork())==0)
	{
		printf("\n");
		close(pipe_fd[1]);
		sleep(2);
		if(read(pipe_fd[0],buf_r,100)>0)
					printf("The Child read pipe is:\n %s\n\n\n",buf_r);
		close(pipe_fd[0]);
		exit(0);
	}
	else if(pid>0){
		close(pipe_fd[0]);
		if(write(pipe_fd[1],"This is father,",15)!= -1)
			printf("Father is write pipe:\nThis is father,\n");
		if(write(pipe_fd[1],"time is over.",13)!=-1)
			printf("time is over.\n\n\n");
		close(pipe_fd[1]);
		sleep(3);
		waitpid(pid,NULL,0);
		exit(0);
	}
}