addresses

[Bill Cunningham]

Are there any functions in c like memcpy perhaps that can return the
memory address from the address bus for an array of say char name[5] ? This
would be 40 bits somewhere. Where in memory?

Bill

[Ian Collins]

Bill Cunningham wrote:

Are there any functions in c like memcpy perhaps that can return the
memory address from the address bus for an array of say char name[5] ? This
would be 40 bits somewhere. Where in memory?

C has no such concept. The best you can do is take the address of a
variable and use that address within the context of the application.
That address may or may not map directly to a physical address.

One any virtual memory operating system, obtaining a physical address
from a virtual address is beyond the scope of standard C.

--
Ian Collins.

[Morris Dovey]

Bill Cunningham wrote:

>
Are there any functions in c like memcpy perhaps that can return the
memory address from the address bus for an array of say char name[5] ? This
would be 40 bits somewhere. Where in memory?

A pointer is as close as you'll get. For machines with a linear
address space, the pointer will probably be the memory address -
but for other architectures (and perhaps some virtual machines)
the pointer may very not be a unique address.

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto

[Kaz Kylheku]

On Feb 8, 7:37*pm, "Bill Cunningham" <[e-mail]:

* * Are there any functions in c like memcpy perhaps that can return the
memory address from the address bus for *an array of say char name[5] ? This
would be 40 bits somewhere. Where in memory?

When you become qualified to work with this type of information, you
will distinguish yourself by knowing where to begin looking for it.

[Bill Cunningham]

C has no such concept. The best you can do is take the address of a

variable and use that address within the context of the application.
That address may or may not map directly to a physical address.

One any virtual memory operating system, obtaining a physical address
from a virtual address is beyond the scope of standard C.

Perhaps what I'm thinking of is a kernel function and the kernel mapping
virtual addresses to physical.
What I'm looking for is probably a probably a return of a virtual
address in hex.

Bill

[Bill Cunningham]

A pointer is as close as you'll get. For machines with a linear

address space, the pointer will probably be the memory address -
but for other architectures (and perhaps some virtual machines)
the pointer may very not be a unique address.

How would you use a pointer?

Bill

[Ian Collins]

Bill Cunningham wrote:

>C has no such concept. The best you can do is take the address of a
variable and use that address within the context of the application.
That address may or may not map directly to a physical address.

One any virtual memory operating system, obtaining a physical address
from a virtual address is beyond the scope of standard C.

Perhaps what I'm thinking of is a kernel function and the kernel mapping
virtual addresses to physical.

That would be very platform specific.

What I'm looking for is probably a probably a return of a virtual
address in hex.

I'm not sure you are sure what you are looking for! Why do you want to
know a physical address? Only a device driver would care. If you want
to print something in hex, use the printf %x specifier.

--
Ian Collins.

[santosh]

Bill Cunningham wrote:

>A pointer is as close as you'll get. For machines with a linear
address space, the pointer will probably be the memory address -
but for other architectures (and perhaps some virtual machines)
the pointer may very not be a unique address.

How would you use a pointer?

int i, *p = &i;
*p = 5;

Why don't you go through a tutorial?

[Bill Cunningham]

"santosh" <sa*********@gmail.comwrote in message
news:fo**********@registered.motzarella.org...

Bill Cunningham wrote:

>>A pointer is as close as you'll get. For machines with a linear
address space, the pointer will probably be the memory address -
but for other architectures (and perhaps some virtual machines)
the pointer may very not be a unique address.

How would you use a pointer?

int i, *p = &i;
*p = 5;

Why don't you go through a tutorial?

I see what you're doing here. But I don't think it's what I'm looking
for.

[Bill Cunningham]

"Ian Collins" <ia******@hotmail.comwrote in message
news:61**************@mid.individual.net...

Bill Cunningham wrote:

> Are there any functions in c like memcpy perhaps that can return the
memory address from the address bus for an array of say char name[5] ?
This
would be 40 bits somewhere. Where in memory?

C has no such concept. The best you can do is take the address of a
variable and use that address within the context of the application.
That address may or may not map directly to a physical address.

One any virtual memory operating system, obtaining a physical address
from a virtual address is beyond the scope of standard C.

It looks that way.

[Bill Cunningham]

One any virtual memory operating system, obtaining a physical address
from a virtual address is beyond the scope of standard C.

Ok all I need to know.

Bill

[Bart]

On Feb 9, 5:24*pm, "Bill Cunningham" <[e-mail]:

One any virtual memory operating system, obtaining a physical address
from a virtual address is beyond the scope of standard C.

* * Ok all I need to know.

I doubt the physical address would be very useful to you. For one
thing, the physical memory of your task may not be contiguous. And I
think it's likely to keep changing anyway.
--
Bart

[Mark McIntyre]

Randy Howard wrote:

On Sat, 9 Feb 2008 10:58:58 -0600, Joe Wright wrote
(in article <bP******************************@comcast.com>):

>I am convinced that Bill is not a troll and is using C and Usenet as
part of his therapy.

It could also be that he has discovered that relying on political
correctness to override common sense is a proven tactic.

Possibly. But the nature of his questions and answers doesn't seem to be
trollish to me. He rarely challenges accepted beliefs for the sake of
it, and generally stays in the debate.

--
Mark McIntyre

CLC FAQ <http://c-faq.com/>
CLC readme: <http://www.ungerhu.com/jxh/clc.welcome.txt>

[Kaz Kylheku]

On Feb 9, 1:24*pm, "Serve Laurijssen" <[e-mail]:

Yeah Billy is cool :))
A big smile comes on my face when I see a thread made by Bill. Thanks! <3

Billy ``back issues'' are funny. Just don't get sucked in, that's all.

Check out message ID <q0*****************@fe06.lga>

http://groups.google.ca/group/alt.re...d380212a7dd21b