Hi! On Sun, Mar 02, 2008 at 09:05:53PM +0900, AE sysadmin wrote: >Dear List,
>I am crafting C util to read data from tty00 (amd64, i386; >connected to the data src device directly by serial cable). >What should I put in /etc/ttys for the tty00 to make sure >I am doing things correctly? The util is to be run as root. >Would be grateful for any pointers. IMO you don't need /etc/ttys entries for terminals unless you need the terminal to be managed by init(8) or tty flags to be set by ttyflags(8) at boot, or your own program wants to read information from the ttys file using the ttyent family of functions (getttyent(), getttynam(), setttyent(), endttyend()). For normal tty access, you need open/close/read/write, perhaps adorned by O_NONBLOCK (if you need to open the terminal line even though no carrier is detected) and probably a few terminal controls (see tty(4) and termios(4), using ioctl(2) and/or the functions described in the tcsetattr(3) manual page). Kind regards, Hannah.
