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Process related question

Posted on 2004-08-25
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Last Modified: 2010-04-21
Hi all,

Consider the foll. piece of code:

char *p = (1MB) of storage

main()
{

  *p = 200;
  printf(" val = %d", *p)
}

Lets say I get a file a.out which needs to be run.

Please help me understand certain things:
1) how this file would be laid out in memory.
2) Since this would be a file, what filesystem
   related activities would be done (inode ?)
3) Stack allocation and virtual addr. space (conceptual).

In essence I would like to understand the various OS
related actions with reference to a simple program like the above sttored on disk.

Regards,
ASM
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Question by:arut
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8 Comments
 
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sunnycoder earned 500 total points
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by:gheist
gheist earned 500 total points
ID: 11894670
1) any assumptions about memory layout other than using pointers to access various allocations are at least non-portable, just as you cannot assume that all small allocations are one page in size etc.
2) most systems use rtld (runtime loader, in linux - ld.so) which mmap() s files and libraries into memory, but it does not
3) read (1), stack layout depends on processor
0
 

Author Comment

by:arut
ID: 11899623
Hi All,

I am not making any assumptions, but rather want to understand the concepts. I have a a.out and run it.

What are the actions that the kernel would take?

Regards,
Arut
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LVL 45

Expert Comment

by:sunnycoder
ID: 11900078
Hi Arut,

The link I posted gives all those details. pls check the link
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by:gheist
ID: 11903144
Any actions that execve() system call does.... (man execve to find out more), described in (2) and not in the checkable link
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Expert Comment

by:sunnycoder
ID: 11911015
ghiest
execve(2) hardly gives any information about memory layout and internals of memory management.

The link does talk about loading code into memory, different segments and paging
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