trying to rea from /dev/tty fails!

Hi,

I am trying to run the following piece of code. It compiles fine
[root@localhost test]# gcc -o prog prog.c
[root@localhost test]#

Code:

---

#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>

int main()
{
        int n;
        int nread;
        char s[15];
       
        n = open("/dev/tty", O_RDWR);
        nread = read(n, s, 10);
        write(n, s, nread);
}

---

But when I run it:
[root@localhost test]# echo abcd|./prog
Hello
// halts here. comes to prompt after pressing Ctrl+c


When I replace

Code:

---

nread = read(n, s, 10);
write(n, s, nread);

---

with

Code:

---

nread = read(0, s, 10);
write(0, s, nread);

---

it works fine.

What is the scenario if I try to read from /dev/tty?

Thanks and regards,

Arun

Does "open" return a sensible value? (greater than zero?)

--
Mats

open returns 3.

Ah, and the other thing is that the stdin is still tied to your /dev/tty - so you will probably need to do "fclose(stdin)" first.

--
Mats

Hi!

It's working now. :)

Thanks a lot for pointing it out. :)

Arun