The init applet will restart (re-exec) itsself when it
receives a SIGHUP. However, just before it enters its
main loop, it resets SIGHUP to either re-load the inittab
(or ignore it if no inittab is used). Thus preventing
the re-exec option from being triggerable.
This patch adds a signal handler for SIGQUIT for init that
always causes init to re-exec itsself (along with killing
anything else that might be still running).
Hello, all.
Busybox init does not handle removed inittab entry correctly.
# I'm sorry about my poor english, but you can find
# what I would like to say from patch, isn't it?
even if you apply this path,
when yoy try to change a command line option in inittab,
you have to do following steps.
1. remove old line from initrd
2. send HUP signal to init
3. kill old proces which is invoked from init.
4. append new line to inittab
5. send HUP signal to init, again
patch is against current CVS + last patch witch I send it last.
"kill -HUP 1" reloads inittab, and when I append one line to inittab
and send HUP signal two times, It will starts 2 process.
patch against current CVS is attached.
Hi!
I've created a patch to busybox' build system to allow building it in
separate tree in a manner similar to kbuild from kernel version 2.6.
That is, one runs command like
'make O=/build/some/where/for/specific/target/and/options'
and everything is built in this exact directory, provided that it exists.
I understand that applyingc such invasive changes during 'release
candidates' stage of development is at best unwise. So, i'm currently
asking for comments about this patch, starting from whether such thing
is needed at all to whether it coded properly.
'make check' should work now, and one make creates Makefile in build
directory, so one can run 'make' in build directory after that.
One possible caveat is that if we build in some directory other than
source one, the source directory should be 'distclean'ed first.
egor
On Sat, Jun 19, 2004 at 10:57:37PM +0200, Bastian Blank wrote:
> The following patch changes klogd to use openlog/syslog themself
> instead of calling syslog_msg which always calls the triple
> openlog/syslog/closelog.
Updated patch: get rid of syslog_msg entirely. Request from Erik Andersen.
Bastian
It looks like latest uClibc defines ARCH_HAS_MMU, but a few busybox files
test UCLIBC_HAS_MMU, resulting in vfork() getting called instead of
fork(), etc.
Patch below. Only tested for lash.
Cheers,
-Jamie
the busybox menuconfig triggered my "inacceptable number of spelling mistakes"
upper level, so I decided to make a patch ;-)
I also improved some wording to describe some things in a better way.
Many thanks for an incredible piece of software!
Andreas Mohr, random OSS developer
>I'm sure that no user process use old root now, but when run "umount
>/old_root", it says:
> umount: /old_root: Device or resource busy
>
>I have tried to remount /proc within the new root *after* chroot, but
>get the same result.
>
>
I found the problem, I said that no user process use old root when run
my scripts, but
I'm wrong, actually there is a '3' fd open the file
"/old_root/dev/console". By adding
debug message in init/init.c, I found the problem: when init restart(in
exec_signal()),
before open the new terminal device, there is still a file opened(I
don't know which file it is), so the
terminal device(stdin) get fd '1', and the first dup(0)(stdout) return
'2', the second(stderr) return '3'.
I attach a simple patch to solve this problem.
Here's a pretty crude patch to reload /etc/inittab when init receives a
SIGHUP. The mailing list archives weren't entirely clear on whether or
not it should already happen, but didn't appear to be.
The patch:
* Adds a new function, reload_signal() which just calls
parse_inittab() and run_actions(RESPAWN)
* Before entering the while (1) loop set up SIGHUP to call
reload_signal()
* Modify new_init_action to skip the action if the same command
already exists on the same terminal
This last bit means that changing already running entries is a bit
hairy as you can end up with, for example, two shells running on the
same virtual console. However, for solely adding/removing entries this patch
seems to work quite well.
Hello all,
This patch adds more "Help" text to the config system. Almost
all applets now have a help entry. Also, I cleaned up the spacing of
the existing text so that things are consistent. This patch is against
this morning's CVS.
Thomas Cameron
CEI Systems, Inc.
I've found a problem with job control when the init process is restarted.
If the system boots for the first time, I get job control on a serial terminal -
no problems. However, when I restart init by issuing "init -q", then the shell
no longer has job control.
I traced this a problem in console_init in the file init.c. What was happening
after the restart is that the first compare
if (ioctl(0, TIOCGSERIAL, &sr) == 0) {
...
} else if (ioctl(0, VT_GETSTATE, &vt) == 0) {
...
} else {
... // assume /dev/console
}
returned error and subsequently the code assumes /dev/console as the console,
which does not support job control.
Checking the errno after the first call showed that the system was complaining
about the file descriptor. This is probably because the previous init process
had closed all its file descriptors which the new init process had inherited.
andersen@busybox.net wrote:
>Message: 4
>Modified Files:
> init.c
>Log Message:
>Remove code for unsupported kernel versions
Hmm. Current init.c have check >= 2.2.0 kernel one time too.
Ok. Last patch removed this point and move common init code to new file for
/init dir
over the years. Well I finally took the time to track this down. It turns out
that inside linux/kernel/sys.c the kernel will call
machine_halt();
do_exit(0);
when halting, or will call
machine_power_off();
do_exit(0);
during a reboot. Unlike sysv init, we call reboot from within the init
process, so if the call to machine_halt() or machine_power_off() returns, the call to do_exit(0) will cause the kernel to panic. Which is a very
bad thing to happen.
So I just added this little patch to fork and call the reboot
syscall from within the forked child process, thereby neatly
avoiding the problem.
But IMHO, both calls to do_exit(0) within linux/kernel/sys.c
are bugs and should be fixed.
-Erik
modified Kbuild system I put into uClibc. With this, there should be no more
need to modify Rules.mak since I've moved all the interesting options into the
config system. I think I've got everything updated, but you never know, I may
have made some mistakes, so watch closely.
-Erik
best way to go. Sysvinit does not provide a controlling tty since it doesn't
even try to open ttys for apps. We do. So we should _try_ to provide a
controlling tty if possible, but we needn't freak out if it doesn't work. This
way we won't need to use openvt or similar, we'll just have init do the Right
Thing(tm).
New complex patch for decrease size devel version. Requires previous patch.
Also removed small problems from dutmp and tar applets.
Also includes vodz' last_patch61_2:
Last patch correcting comment for #endif and more integrated
with libbb (very reduce size if used "cat" applet also).
Requires last_patch61 for modutils/config.in.
control turned off" bug, console_setup() was called with a closed file
descriptor, setsid() inconsistancy, and silly string handling bugs. I have
modified his patch to allow the askfirst init actions to have a controlling
terminal.
the busybox development tree. This eliminates the use of recursive make, and
once again allows us to run 'make' in a subdirectory with the expected result.
And things are now much faster too. Greatly improved IMHO...
-Erik
start-stop-daemon man page:
-b|--background
Typically used with programs that don't detach on their own.
This option will force start-stop-daemon to fork before starting
the process, and force it into the background. WARNING:
start-stop-daemon cannot check the exit status if the process
fails to execute for any reason. This is a last resort, and is
only meant for programs that either make no sense forking on
their own, or where it's not feasible to add the code for it to
do this itself.
This is usefull for applets like watchdog
Very minimal last corrections:
1) busybox.c: fix warining
2) docs/: add applets for list from pwd_grp
3) usage.h: add -n option for route
4) run_parts.c: many todo fix for busybox style
5) addgroup.c: add #ifdef CONFIG_FEATURE_SHADOWPASSWDS, reduce one
perror_msg
6) adduser.c: fix bug "variable i not initialize" and
add #ifdef CONFIG_FEATURE_SHADOWPASSWDS
that into a pid_t, which is unsigned on a number archs. Furthermore,
find_pid_by_name() would _never_ return an error if the intended proces
was "init", but instead would return 1, meaning we would fail to work
on 2.4.x kernels running an initrd...
-Erik
Kimdon <dwhedon@gordian.com> on october 7th -- the day I was fired from
Lineo. So it seems I totally forgot about this patch until now.
Sorry about that David!
1st makes init smaller, and fixes a bug with AskFirst. Reading from
/dev/null gives EOF.
2nd makes init run the command's in the order of inittab, as in
FIFO instead of LIFO.
This way, we can new get rid of all that tedious #define rubbish we used to
need to enable specific messages. This way is enormously simpler, and as a
bonus also ends up saving us 96 bytes.
-Erik
environment variables set from the kernel command line to be inherited
bu application programs. Slightly changed to special case handling of
TERM, so that it has sane defaults when on a serial console.
-Erik
to multibuild.pl. I did a little formatting adjustments to make it
_very_ obvious when things stop working. I also removed the USE_PROCFS
config option -- just do the right thing when USE_DEVPS_PATCH is enabled.
-Erik
busybox.h which slowed compiles. I left only what was needed and then fixed up
all the apps to include their own header files. I also fixed naming for pwd.h
and grp.h functions. Tested to compile and run with libc5, glibc, and uClibc.
-Erik
rather then busylooping trying to kill the first one until it dies.
Should be more efficient now, and will only send one signal to each
specified process.
-Erik
the same functionality). /proc takes up 90k of kernel space, so it is
nice to avoid using it at all costs. The only places where it is depended
on is for cetain optional mount/umount features, and for ps and lsmod.
-Erik
options, logger is better behaved and has a "-t" option now. init now supports
the kernel chroot patch, so you can chroot to a new device and umount the old
root.
-Erik
