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SubjectRe: SAK killing daemons
> I noticed that when I press SAK on virtual console #1
> on my Linux box, some daemons die horribly (SIGKILLed)
> and some are unaffected. This does not happen on other consoles.
>
> I suppose dying daemons did not detach fully from controlling tty. And
> since they were launched from virtual console #1 upon system startup,
> SAK killed them.
>
> Daemons dying upon SAK: syslogd mysqld top* logger*
> Daemons surviving SAK: klogd gpm dhcpcd inetd automount
>
> * these are not daemons, but I intend them to run continuously.
> logger directs mysqld output to syslog, and I keep top on console #10:
> su user0 -c "top s </dev/tty10 >/dev/tty10 &"
>
> Also I see '?' in TTY column in 'ps -AH e' output for all these
> daemons (both dying and surviving), so ps does not provide any hint...
>
> Does anybody knows a way to write a helper script to detach
> misbehaving daemons (or any normal process like top) from tty on startup?
> BTW, do syslogd needs fixing to be immune to SAK like klogd?
>
> Please CC me. I'm not on the list.

Try running the dying daemons by setsid utility (man 1 setsid, man 2 setsid),
it can help maybe. And try to modify that su -c command to:

su user0 -c "top s" </dev/tty/10 >/dev/tty10 2>/dev/tty10 &

that could help also.

--

Petr "Pasky" Baudis
. .
#define BITCOUNT(x) (((BX_(x)+(BX_(x)>>4)) & 0x0F0F0F0F) % 255)
#define BX_(x) ((x) - (((x)>>1)&0x77777777) \
- (((x)>>2)&0x33333333) \
- (((x)>>3)&0x11111111))
-- really weird C code to count the number of bits in a word
. .
My public PGP key is on: http://pasky.ji.cz/~pasky/pubkey.txt
-----BEGIN GEEK CODE BLOCK-----
Version: 3.12
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