c - 将 EOF 写入管道

Question

我有一个父进程和一个子进程，我想通过管道将 EOF 从父进程写入子进程...这是如何工作的？

这是我的尝试:

---父代码---

if(dup2(parent_pipe[1], STDOUT_FILENO) == -1) { /*stdout gets closed and parent_pipe is duplicated with id of stdout*/
        error("Can't duplicate the write-end of the pipe to stdout!");
}
if(close(parent_pipe[0]) == -1) {
    error("Can't close read-end of the pipe!");
}

char blub[] = "EOF";
if(write(parent_pipe[1], blub, strlen(blub)) == -1) {
error("Failed to write the array");
}

--- child 代码---

if(dup2(parent_pipe[0], STDIN_FILENO) == -1) { /*stdin gets closed and parent_pipe is duplicated with id of stin*/
    error("Can't duplicate the read-end of the pipe to stdin!");
}
/* close the write-end of the pipe */
if(close(parent_pipe[1]) == -1) {
    error("Can't close write-end of the pipe");
}

while(fgets(readbuffer, ROWLENGTH, stdin) != NULL) {
    printf("Received string: %s", readbuffer, nbytes);
}

child 等待 EOF 并没有停止，我该如何解决这个问题？提前致谢

Answer 1

当要停止通信时，必须关闭父进程中的管道:

dup2(...);
...
write to child
...
close(parent_pipe[1]);