tracing Sys V semaphores
2007-12-25 2:12:00
add more is to reboot...
ipcs -a -s doesn't report much useful information when the semaphores
are owned by root -- are there any alternatives? Is there a place
that tracks (or can I turn on tracking) to see which process created them?
For example, yesterday I got:
:1 mleisner at santa 09:34:43; ipcs -s -a
IPC status from <running system> as of Thu Oct 16 09:38:52 EDT 2003
T ID KEY MODE OWNER GROUP CREATOR CGROUP NSEMS OTIME CTIME
Semaphores:
s 0 0xf9017601 --ra-r--r-- root root root root 1 9:38:45 8:00:58
s 1 0xf9017602 --ra-r--r-- root root root root 1 9:38:44 8:00:58
s 2 0xf9017606 --ra-r--r-- root root root root 1 9:38:48 8:00:58
s 3 0xf9017607 --ra-r--r-- root root root root 1 no-entry 8:00:58
s 4 0xf9017608 --ra-r--r-- root root root root 1 8:00:59 8:00:58
s 5 0xf9017609 --ra-r--r-- root root root root 1 no-entry 8:00:59
s 6 0xf901760a --ra-r--r-- root root root root 1 no-entry 8:00:59
s 2949127 0x39084380 --ra-ra-r-- lla thvsw lla thvsw 3 15:12:13 15:11:45
s 1638408 0x3908ad60 --ra-ra-r-- swarne01 thvsw swarne01 thvsw 3 9:24:43 10:32:30
s 4259849 0x31083170 --ra-ra-r-- dhinz esmd dhinz esmd 3 16:44:56 16:41:19
Just now I got:
:1 mleisner at santa 10:01:14; ipcs -s -a
IPC status from <running system> as of Fri Oct 17 10:01:16 EDT 2003
T ID KEY MODE OWNER GROUP CREATOR CGROUP NSEMS OTIME CTIME
Semaphores:
s 0 0xf9017601 --ra-r--r-- root root root root 1 10:01:01 8:00:58
s 1 0xf9017602 --ra-r--r-- root root root root 1 10:01:00 8:00:58
s 2 0xf9017606 --ra-r--r-- root root root root 1 10:01:07 8:00:58
s 3 0xf9017607 --ra-r--r-- root root root root 1 no-entry 8:00:58
s 4 0xf9017608 --ra-r--r-- root root root root 1 8:00:59 8:00:58
s 5 0xf9017609 --ra-r--r-- root root root root 1 no-entry 8:00:59
s 6 0xf901760a --ra-r--r-- root root root root 1 no-entry 8:00:59
s 2949127 0x39084380 --ra-ra-r-- lla thvsw lla thvsw 3 15:12:13 15:11:45
s 1638408 0x3908ad60 --ra-ra-r-- swarne01 thvsw swarne01 thvsw 3 9:24:43 10:32:30
s 4259849 0x31083170 --ra-ra-r-- dhinz esmd dhinz esmd 3 16:44:56 16:41:19
Unfortunately, they don't give a clue to the date -- is there any way to find this out?
Semaphore IDs 3, 5 and 6 appear to have never been used -- can I ipcrm them as root?
I suppose if someone ever wants to use them, it will fail...
OTIME and CTIME
If I get any advice, I'll summarize to the list...
marty mleisner at eng.mc.xerox.com
Don't confuse education with schooling.
Milton Friedman to Yogi Berra
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