On Sun, Jun 18, 2006 at 11:23:03PM +0200, Samuel Thibault wrote:
> Hi,
>
> There's a long-standing issue in init=/bin/sh mode: pressing control-C
> doesn't send a SIGINT to programs running on the console. The incurred
> typical pitfall is if one runs ping without a -c option... no way to
> stop it!
>
> This is because no session is set up by the kernel, and shells don't
> start sessions on their own, so that no session (hence no controlling
> tty) is set up.
>
> The attached patch sets such session and controlling tty up, which fixes
> the issue. The unfortunate effect is that init might be killed if one
> presses control-C very fast after its start.
This downside is a little problematic. Wouldn't it be possible to disable
the interrupt signal on the terminal, and let the user re-enable it when
needed using "stty intr ^C" ?
I too am used to starting with init=/bin/sh, but I'm also used to launch
ping in the background. However, if getting Ctrl-C working implies a risk
of killing init, then I'd rather keep it the old way.
> Samuel
Regards,
Willy
> --- linux-2.6.17-orig/init/main.c 2006-06-18 19:22:40.000000000 +0200
> +++ linux-2.6.17-perso/init/main.c 2006-06-18 23:00:00.000000000 +0200
> @@ -703,9 +703,13 @@
> system_state = SYSTEM_RUNNING;
> numa_default_policy();
>
> + sys_setsid();
> +
> if (sys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
> printk(KERN_WARNING "Warning: unable to open an initial console.\n");
>
> + sys_ioctl(0, TIOCSCTTY, 1);
> +
> (void) sys_dup(0);
> (void) sys_dup(0);
>
-
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