Re: How arguments are stored on pages linux_bprm (Kernel 2.4)

["s prashant" <sprashant16@xxxxxxxxx>]

The arguments are copied onto the bprm.pages using the copy_strings api.
bprm.p = PAGE_SIZE*MAX_ARG_PAGES-sizeof (void*) indicates the total
bytes that the pages can accomadate. The arrangement of the arguments onto
the pages is as shown in the figure.

		                                    pages 
			-------------------------    ---
			|	sizeof (void*)	|     ^	
			|-----------------------|     |
			|	argv[0]		|     |
			|-----------------------|    31
			|	argv[1]		|     |
			|-----------------------|     |
			|	argv[2]		|     |
			|=======================|    ---
			|	argv[3]		|     ^	
			|-----------------------|     |
			|	argv[4]		|     |
			|-----------------------|    30
			|	  |		|     |
			|-----------------------|     |
			|	  |		|     |
			|=======================|    ---
			|	  |		|
			|	  |		|
			|	  |		|
			|	  |		|
			|	  |		|
			|	  |		|
			|=======================|    ---
			|			|     ^
			|			|     |
			|			|     |
			|			|     0
			|			|     |
			|			|     |
			------------------------     ---

      
The above info is w.r.t 2.4.21 kernel.
Anybody please correct me if i am wrong.

regards
prashant.

On 6/5/06, Dang <linuxdang@xxxxxxxxx> wrote:

Hi,

    I have a requirement of reading command line arguments passed while invoking a binary, inside load_elf_binary(). I tried to read kernel 2.4 code but i am confused how data is stored inside the pages (linux_bprm)

Can anybody point to some document / tutorial or if possible brief me about how it is done?

 

Regards,

Dang

-- 
S Prashant
email:- prashant@xxxxxxxxxxxxx
SolidCore Techsoft Systems India(Pvt)Ltd
A-16, Mohan Co-operative Industrial Estate,
Mathura Road,
New Delhi, 11 00 44
Phone:91 11 51678443