adding a new system call

**glugT** · May 11th, 2012

hi,

I am trying to add a new custom system call to my kernel.
kernel version 3.4.0.
can anyone give a detailed step by step instruction on how to do it.

**lisati** · May 11th, 2012

Not exactly a task for an absolute beginner?

Thread moved to Programming Talk.

**codemaniac** · May 11th, 2012

You can find the below links useful , however it assumes you are familiar with bulding kernel .
http://www.cs.brynmawr.edu/cs355/how...ystemcall.html
http://tldp.org/HOWTO/html_single/Im...inux-2.6-i386/

**glugT** · May 11th, 2012

hi,
sorry for posting it in the absolute beginner.I am not a beginner.And i got how to do it.thanks

**lisati** · May 11th, 2012

Originally Posted by glugT

hi,
sorry for posting it in the absolute beginner.I am not a beginner.And i got how to do it.thanks

Were the links provided by codemaniac any help?

**PeterP24** · May 12th, 2012

sorry for stepping by - You do realise that this thread will step over in searches for "how to add a new custom system call to Linux kernel"?

So if you found an immediate and nice solution: it is too much to ask you to share it with us?

Thanks!

**glugT** · May 14th, 2012

hi,

I would love to share it.

let the place where you downloaded the kernel be called linux-3.4

First add the system call code to linux-3.4/fs/open.c

and then add your system call number and name in the file syscall_32.tbl which will be in linux-3.4/arch/x86/syscalls/syscall_32.tbl

then build your kernel and boot into it.

**glugT** · May 14th, 2012

Originally Posted by lisati

Were the links provided by codemaniac any help?

I guess they were for older kernels.I had tried them before.I may have made errors too but they did not seem to work for me.

**codemaniac** · May 14th, 2012

Originally Posted by glugT

I guess they were for older kernels.I had tried them before.I may have made errors too but they did not seem to work for me.

It was there just to get you started with the basics .
Can you share the errors you are getting while you compile ?

**glugT** · May 15th, 2012

Originally Posted by codemaniac

It was there just to get you started with the basics .
Can you share the errors you are getting while you compile ?

The directories and files mentioned were not present in my kernel.the paths were different and in some files were not present.

So the method i had mentioned worked.To add systems call in older kernels like 2.6 leads to many make errors.gcc 4.6 compilers are not compatible with older kernels