On Thu, Jul 9, 2009 at 12:26 PM, Anna Martynova<[email protected]> wrote:
> Hello, all.
> At the moment I am upgrading my system from busybox 1.8.2 to 1.14.2. I found
> such difference in init behavior: in old version 'sysinit' action was called
> with run() function, so other init actions (such as 'askfirst' - shells on
> virtual consoles) could be running at the same time. But in the latest
> version sysinit action is called with waitfor() function, and all other
> actions wait for it's completion.
> I found this place in source and changed 'waitfor' to 'run' to check my
> guess. But the question still exists:
> What for it has been made? For now I have no idea, from where I can call
> other start scripts, except rcS... But I need virtual consoles. :)
> Thanks in advance.
Looks like it was a bug. Sysinit action(s) should be waited for.
This is what init.c says:
/* Each type of actions can appear many times. They will be
* handled in order. RESTART is an exception, only 1st is used.
*/
/* Start these actions first and wait for completion */
#define SYSINIT 0x01
/* Start these after SYSINIT and wait for completion */
#define WAIT 0x02
/* Start these after WAIT and *dont* wait for completion */
#define ONCE 0x04
/*
* NB: while SYSINIT/WAIT/ONCE are being processed,
* SIGHUP ("reread /etc/inittab") will be ignored.
* Rationale: it would be ambiguous whether SYSINIT/WAIT/ONCE
* need to be rerun or not.
*/
/* Start these after ONCE are started, restart on exit */
#define RESPAWN 0x08
/* Like RESPAWN, but wait for <Enter> to be pressed on tty */
#define ASKFIRST 0x10
/*
* Start these on SIGINT, and wait for completion.
* Then go back to respawning RESPAWN and ASKFIRST actions.
* NB: kernel sends SIGINT to us if Ctrl-Alt-Del was pressed.
*/
#define CTRLALTDEL 0x20
/*
* Start these before killing all processes in preparation for
* running RESTART actions or doing low-level halt/reboot/poweroff
* (initiated by SIGUSR1/SIGTERM/SIGUSR2).
* Wait for completion before proceeding.
*/
#define SHUTDOWN 0x40
/*
* exec() on SIGQUIT. SHUTDOWN actions are started and waited for,
* then all processes are killed, then init exec's 1st RESTART action,
* replacing itself by it. If no RESTART action specified,
* SIGQUIT has no effect.
*/
#define RESTART 0x80
Looks like you can use "once" to achieve what you want.
--
vda
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