restoring stdin as keyboard

[Majoni]

Hello All,
Supose we do close(0) and the dup it to another file descripter to use the new file as the stdin input.

Is there anyway to restore the keyboard as the standard input in the same program
Thanks,
Majoni

[Salem]

Make a copy of 0 using dup() before you close it, so that you can dup() it again to get back to it.

IIRC

keep = dup(0);
close(0);
dup(fd);  // fd is now stdin
close(0);
dup(keep); // back to original stdin

[Majoni]

Thanks
But isn't it stored atomatically by the kernel?

[Salem]

Why would it be?

It doesn't mean a damn thing to the kernel, it's just an open file descriptor owned by a process.