What does macro TIOCGDEV mean?-CodePudding

I am reading source code under Linux and reach this function:

ioctl (fd, TIOCGDEV, &devnum)

But I don't find the document about the macro TIOCGDEV from man page, what does this macro mean ?

CodePudding user response：

"/* Get real dev no below /dev/console */"

"The TIOCGDEV ioctl is a hack written to allow bootup messages to be display both on the screen and also to be logged"

"Without the real device to which /dev/console is connected, blogd can not work."

I believe nowadays we have journald from systemd.