topic Re: dlkm compiled error in Operating System - HP-UX

dlkm compiled error

kaijile — Mon, 29 Jun 2009 07:14:47 GMT

I wrote a code on hpux11.11
and compiled the dlkm error

extern struct sysent sysent[];

int my_kill(pid_t pid, int sig)
{
printf( "pid is %d\n", pid );

return kill( pid, sig );
}

int my_load()
{
sysent[SYS_kill].sy_call = &(my_kill);//line 278
return 0;
}

cc: "my_mod.c", line 278: error 1720: Subscript expression must combine object pointer and integer.
cc: "my_mod.c", line 278: error 1529: Cannot select field of non-structure.

why have these errors?

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

Re: dlkm compiled error

Laurent Menase — Mon, 29 Jun 2009 07:36:04 GMT

where did you get struct sysent definition?
what is your struct sysent definition?
What is you SYS_kill definition?

Usually they are private and not available.

Re: dlkm compiled error

Laurent Menase — Mon, 29 Jun 2009 08:27:20 GMT

basically your sysent structure doesn't look to be defined.

Re: dlkm compiled error

Laurent Menase — Mon, 29 Jun 2009 08:50:16 GMT

external api exist using
sysent_delete()
sysent_assign_function()
sysent_define_arg()

Re: dlkm compiled error

kaijile — Mon, 29 Jun 2009 16:15:06 GMT

indirect kill system call on HP-UX 11.11i

http://unix.derkeiler.com/Newsgroups/comp.sys.hp.hpux/2003-09/0224.html

bash-4.0# nm /stand/vmunix |grep sysent
[8356] | 9565376| 8|OBJT |LOCAL|0| .rodata|S$414$sysent_link_function
[38471] | 11852496| 8|OBJT |GLOB |0| .data|kload_sysent
[20530] | 12472824| 4|OBJT |GLOB |0| .sdata|nsysent
[35194] | 4311816| 328|FUNC |GLOB |0| .text|patch_sysent_stub
[20577] | 11733352| 4|OBJT |GLOB |0| .data|sysent
[24412] | 4312712| 784|FUNC |GLOB |0| .text|sysent_assign_function
[22214] | 4313960| 452|FUNC |GLOB |0| .text|sysent_complain
[28378] | 4312144| 564|FUNC |GLOB |0| .text|sysent_define_arg
[39319] | 4310184| 472|FUNC |GLOB |0| .text|sysent_delete
[27159] | 4310656| 492|FUNC |GLOB |0| .text|sysent_enable
[38654] | 4310112| 36|FUNC |GLOB |0| .text|sysent_get_function
[26765] | 4310040| 36|FUNC |GLOB |0| .text|sysent_get_name
[26665] | 4310080| 32|FUNC |GLOB |0| .text|sysent_get_narg
[38537] | 4311152| 660|FUNC |GLOB |0| .text|sysent_link_function
[25129] | 4310168| 8|FUNC |GLOB |0| .text|sysent_returns_long
[22001] | 4310152| 8|FUNC |GLOB |0| .text|sysent_returns_pointer
[39362] | 4310176| 8|FUNC |GLOB |0| .text|sysent_returns_range
[27135] | 4310160| 8|FUNC |GLOB |0| .text|sysent_returns_ulong

Re: dlkm compiled error

Dennis Handly — Mon, 29 Jun 2009 18:41:25 GMT

>indirect kill system call on 11.11

You can't write C code unless you have a header that defines your variables, types (struct sysent), enums and defines.

Re: dlkm compiled error

Laurent Menase — Tue, 30 Jun 2009 12:26:57 GMT

If your purpose is only to get kill printouts there are other solutions.
An HP internal support instrumentation called timer9 exist which traces kill calls.
but it is statically linked.

you can also use ktracer

ktracer -a kill
ktracer -B

ktracedump -D will tell you all kill called on the system.

Also there is an other problem
a syscall have only 1 parameter which is a pointer to the uarea.

Re: dlkm compiled error

kaijile — Tue, 30 Jun 2009 16:39:50 GMT

thanks Laurent Menase & Dennis Handly