System call number

System call number

[Josef E. Galea]

Hi,

Can anyone tell me the system call number for the function 
write_swap_page() (in kernel/power/pmdisk.c) as I can't find it in unistd.h.

Thanks
Josef E. Galea
josefeg@euroweb.net.mt 

Re: System call number

[Randy.Dunlap]

Josef E. Galea wrote:

> Hi,

> Can anyone tell me the system call number for the function 
> write_swap_page() (in kernel/power/pmdisk.c) as I can't find it in 
> unistd.h.

What kernel version?  I don't see what source file in
2.6.10-rc1-bk23.

There are lots of kernel functions that don't have syscall numbers.
E.g, write_page() in kernel/power/swsusp.c.

-- 
~Randy

Re: System call number

[Jan Engelhardt]

>> Hi,
>
>> Can anyone tell me the system call number for the function
>> write_swap_page() (in kernel/power/pmdisk.c) as I can't find it in
>> unistd.h.

For all others, see linux/arch/<YOURARCH>/kernel/entry.S

>What kernel version?  I don't see what source file in
>2.6.10-rc1-bk23.
>
>There are lots of kernel functions that don't have syscall numbers.
>E.g, write_page() in kernel/power/swsusp.c.



Jan Engelhardt
-- 
Gesellschaft für Wissenschaftliche Datenverarbeitung
Am Fassberg, 37077 Göttingen, www.gwdg.de

Re: System call number

[Måns Rullgård]

"Josef E. Galea" <josefeg@euroweb.net.mt> writes:

> Hi,
>
> Can anyone tell me the system call number for the function
> write_swap_page() (in kernel/power/pmdisk.c) as I can't find it in
> unistd.h.

What makes you believe that function is a system call in the first
place?  It doesn't look like one to me.  Hint: system calls have names
prefixed with sys_ (are there any exceptions?).

-- 
Måns Rullgård
mru@inprovide.com

Re: System call number

[Randy.Dunlap]

Måns Rullgård wrote:
> "Josef E. Galea" <josefeg@euroweb.net.mt> writes:
> 
> 
>>Hi,
>>
>>Can anyone tell me the system call number for the function
>>write_swap_page() (in kernel/power/pmdisk.c) as I can't find it in
>>unistd.h.
> 
> 
> What makes you believe that function is a system call in the first
> place?  It doesn't look like one to me.  Hint: system calls have names
> prefixed with sys_ (are there any exceptions?).

Not that I know of.  I changed a few syscall names roughly 1 year
ago so that they begin with sys_xyz (and some that began with
sys_xyz that were not syscalls, I changed those also. :)


-- 
~Randy

Re: System call number

[Josef E. Galea]

Randy.Dunlap wrote:

> Josef E. Galea wrote:
>
>> Hi,
>
>
>> Can anyone tell me the system call number for the function 
>> write_swap_page() (in kernel/power/pmdisk.c) as I can't find it in 
>> unistd.h.
>
>
> What kernel version?  I don't see what source file in
> 2.6.10-rc1-bk23.
>
> There are lots of kernel functions that don't have syscall numbers.
> E.g, write_page() in kernel/power/swsusp.c.
>
Version 2.6.8.1. The mention file can be found at 
http://lxr.linux.no/source/kernel/power/pmdisk.c?v=2.6.8.1#L191

Thanks
Josef

system call number

[mohit verma]

hi all,
suppose a process has invoked some system call and cpu runs the system call
.how can i find out the system call number (invoked) related to that process
in kenrel space?

thanks in advance.
........................
*MOHIT VERMA*
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system call number

[mohit verma]

hi all,
suppose a process has invoked some system call and cpu runs the system call
.how can i find out the system call number (invoked) related to that process
in kenrel space?

thanks in advance.
........................
*MOHIT VERMA*
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system call number

[Mulyadi Santosa]

Hi..

On Sun, Feb 27, 2011 at 20:41, mohit verma <mohit89mlnc@gmail.com> wrote:
> hi all,
> suppose a process has invoked some system call and cpu runs the system call
> .how can i find out the system call number (invoked) related to that process
> in kenrel space?

Untested idea:

check the related process' kernel stack....specificly the first stack
frame. Then cross check it with information from
http://lxr.linux.no/linux+v2.6.37.2/arch/x86/kernel/entry_32.S or your
related arch.

the upper most comment written there will show the meaning of each
values saved in that stack frame. Then what you need to do is just
locate where EAX is...

I think that's one of the ways....probably there are more....


-- 
regards,

Mulyadi Santosa
Freelance Linux trainer and consultant

blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com