Why console shows message when write message to file descriptor 0 1 2

Asked Jun 08 '20 at 01:16

Active Jun 08 '20 at 01:19

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I write a message to file descriptor 0(stdin) 1(stdout) 2(stderr), I am not very sure why the message can be printed in console...

int main(void) {
  char buf[] = "Hello World";

  write(0, (void *)buf, strlen(buf));
  write(1, (void *)buf, strlen(buf));
  write(2, (void *)buf, strlen(buf));
}

edited Jun 08 '20 at 01:19

user207421

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asked Jun 08 '20 at 01:16

hounangogogo

3

Because that's what they're attached to, unless you've redirected them. – user207421 Jun 08 '20 at 01:20
1

See the related question [Why is it possible to write() to STDIN?](https://stackoverflow.com/questions/37822580/why-is-it-possible-to-write-to-stdin). – dxiv Jun 08 '20 at 01:24
1

Where else do you think the output should go? – Shawn Jun 08 '20 at 03:39

Why console shows message when write message to file descriptor 0 1 2

0 Answers0