#include <unistd.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;
int r_num;
memset(buf_r, 0, sizeof(buf_r));
// 创建管道
if (pipe(pipe_fd) < 0)
{
perror("pipe");
return -1;
}
// 创建子进程
if ((pid = fork()) == 0) // 子进程还是父进程？？
{
printf("111\n");
close(pipe_fd[1]); // 关闭管道写端
//sleep(10);
if ((r_num = read(pipe_fd[0], buf_r, 100)) > 0)
{
printf ("%d bytes read from the pipe is %s\n", r_num, buf_r);
}
close(pipe_fd[0]);
exit(0);
}
else if (pid > 0)
{
close(pipe_fd[0]); // 关闭管道读端
sleep(10);
if (write (pipe_fd[1], "Hello", 5) != -1)
{
printf ("parent write1 Hello\n");
}
sleep(3);
if (write (pipe_fd[1], " Pipe", 5) != -1)
{
printf ("parent write2 Pipe\n");
}
close(pipe_fd[1]);
sleep(3);
waitpid(pid, NULL, 0); // 等待子进程结束
exit(0);
}
return 0;
}
