Re: Fork and Exec a process within the kernel

[Erik Mouw <erik@harddisk-recovery.com>]

On Tue, Aug 10, 2004 at 03:03:08PM -0400, Richard B. Johnson wrote:
> /dev/console is a symlink to /dev/tty0.

Please don't mislead newbies, Richard. /dev/console is NOT a link to
/dev/tty0, it's a completely different device:

erik@abra2:~ >ls -l /dev/console 
crw-------    1 root     tty        5,   1 Apr  7 09:13 /dev/console
erik@abra2:~ >ls -l /dev/tty0
crw-------    1 root     tty        4,   0 Feb 10  2000 /dev/tty0

On x86 desktop systems console output usually comes on the virtual
terminals, but you can also use serial console. My embedded StrongARM
board only has serial console.

>     struct termios term;
> 
>     tcgetattr(0, &term);	// Get old terminal characteristics
>     (void)close(0);		// Close old terminal(s)
>     (void)close(1);
>     (void)close(2);
>     fd = open("/dev/console", O_RDWR);

And what happens when you have console on a device that's not a serial
port like a line printer?


Erik

-- 
+-- Erik Mouw -- www.harddisk-recovery.com -- +31 70 370 12 90 --
| Lab address: Delftechpark 26, 2628 XH, Delft, The Netherlands