topic Re: how to get current process in hpux11 dlkm in Operating System - HP-UX

how to get current process in hpux11 dlkm

kaijile — Tue, 07 Jul 2009 07:20:02 GMT

I'm developing dlkm now on HP-UX 11.11i
in my kernel module i want to get the current process ,such as linux's macro "current"
how to get current process in hpux11 dlkm?

Re: how to get current process in hpux11 dlkm

Dennis Handly — Tue, 07 Jul 2009 07:52:38 GMT

What would be the current process if you have a N way machine? The one that is doing the I/O?

You want to supply more info on what you are trying to do.

Re: how to get current process in hpux11 dlkm

Laurent Menase — Tue, 07 Jul 2009 10:30:32 GMT

on 11.23:
thread id:
kt_tid(u.u_kthreadp);

process id
p_pid(u.uprocp);

don't forget to include sys/user.h

Re: how to get current process in hpux11 dlkm

kaijile — Tue, 07 Jul 2009 13:44:38 GMT

I want to get the current process's struct proc and struct kthread descriptor,how to get their pointer?

how to traversing all struct proc and struct kthread descriptors in kernel ?

kt_tid is ok ,but when i used p_pid(u.uprocp);
have compile error :
cc: "test.c", line 187: error 1588: "uprocp" undefined

where is the variabe u defined?

bash-4.0# uname -a
HP-UX rp5470 B.11.11 U 9000/800 142444635 unlimited-user license

Re: how to get current process in hpux11 dlkm

Laurent Menase — Tue, 07 Jul 2009 13:50:35 GMT

u.u_procp
sorry for the typo

Re: how to get current process in hpux11 dlkm

Laurent Menase — Tue, 07 Jul 2009 13:51:59 GMT

it is in
/usr/include/machine/sys/user.h I believe.
it is a struct user defined in
/usr/include/sys/user.h

Re: how to get current process in hpux11 dlkm

kaijile — Wed, 08 Jul 2009 01:05:47 GMT

kt_tid(u.u_kthreadp);

p_pid(u.uprocp);

I can't find these two functions in the
HP-UX 11i v1 Driver Development Guide and
HP-UX 11i v1 Driver Development Reference Guide

which Documentation has mentioned p_pid() and
kt_tid() function?

Re: how to get current process in hpux11 dlkm

Laurent Menase — Wed, 08 Jul 2009 05:39:42 GMT

they are defined in kthread_iface.h and proc_iface.h
Else I don't know. may be in 11i v2 dd ref guide

Re: how to get current process in hpux11 dlkm

Laurent Menase — Wed, 08 Jul 2009 08:03:22 GMT

but what are you trying to make exactly?

a kill calls logger?

Re: how to get current process in hpux11 dlkm

kaijile — Thu, 09 Jul 2009 01:02:05 GMT

i want to traversing all struct proc and struct kthread descriptors in kernel,
but i can not find suitable kernel API function to do it.
in HP-UX 11i v1 Driver Development Guide and
HP-UX 11i v1 Driver Development Reference Guide
i can not find related information

Re: how to get current process in hpux11 dlkm

Laurent Menase — Thu, 09 Jul 2009 05:24:04 GMT

from user level you have pstat_getproc funcs
else in the kernel:
proc_pstat_idx_lookup_hold
proc_pstat_lookup_next_hold

- don(t forget to call proc_release()

Re: how to get current process in hpux11 dlkm

Laurent Menase — Thu, 09 Jul 2009 05:27:24 GMT

then once you have the proc you can look at its threads with
kt=p_firstthreadp(p)
then you can use kt_nextp(kt)

Then release the hold.

Re: how to get current process in hpux11 dlkm

Laurent Menase — Thu, 09 Jul 2009 05:29:03 GMT

be carefull that walking all procs and threads can take time. So be carefull to schedyield()
2 process walk.

Re: how to get current process in hpux11 dlkm

kaijile — Tue, 14 Jul 2009 02:04:54 GMT

Is proc_list have lock?
what's the name of proc_list's lock?
how to use proc_list's lock ?

Re: how to get current process in hpux11 dlkm

Laurent Menase — Tue, 14 Jul 2009 19:15:46 GMT

proc_pstat_idx_lookup_hold
proc_pstat_lookup_next_hold

- don(t forget to call proc_release()

the hold and release is for that

Re: how to get current process in hpux11 dlkm

kaijile — Wed, 15 Jul 2009 07:02:42 GMT

In kernel, i have the pid of the process,
how to get absolute path name of the executable file?

Re: how to get current process in hpux11 dlkm

Laurent Menase — Wed, 15 Jul 2009 10:29:26 GMT

In fact I don't see any easy way

Re: how to get current process in hpux11 dlkm

Dennis Handly — Wed, 15 Jul 2009 10:51:49 GMT

>how to get absolute path name of the executable file?

Here is how to use pstat(2) calls to get it outside the kernel, not sure if that helps:
http://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=1350198

Re: how to get current process in hpux11 dlkm

Laurent Menase — Wed, 15 Jul 2009 11:44:18 GMT

in kernel no public API permit to find it.

Re: how to get current process in hpux11 dlkm

kaijile — Wed, 15 Jul 2009 12:46:48 GMT

what are the functions pstat_stub32() and pstat() return value?

q4> disassemble pstat_stub32
Dump of assembler code for function pstat_stub32:
0x8b5678 : ldw 4(%r26),%ret0
0x8b567c : extrw,s %ret0,0,1,%ret0
0x8b5680 : stw %ret0,0(%r26)
0x8b5684 : stw %r0,8(%r26)
0x8b5688 : stw %r0,0x10(%r26)
0x8b568c : stw %r0,0x18(%r26)
0x8b5690 : ldw 0x24(%r26),%ret0
0x8b5694 : extrw,s %ret0,0,1,%ret0
0x8b5698 : ldil L'0x9a000,%r31
0x8b569c : be 0x358(%sr4,%r31)
0x8b56a0 : stw %ret0,0x20(%r26)
End of assembler dump.
q4> disassemble pstat|more
Dump of assembler code for function pstat:
0x9a358 : std %rp,-0x10(%sp)
0x9a35c : ldo 0x80(%sp),%sp
0x9a360 : mfia %r26
0x9a364 : addil L'-0x800,%r26,%r1
0x9a368 : ldo 0x7f8(%r1),%r26
0x9a36c : addil L'-0x10e000,%dp,%r1
0x9a370 : ldd 0x10(%r1),%r25
0x9a374 : ldd 0x440(%r25),%r24