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Full Discussion: O argv, argv, wherefore art thou argv?
Top Forums UNIX for Advanced & Expert Users O argv, argv, wherefore art thou argv? Post 302804445 by alister on Wednesday 8th of May 2013 03:17:37 PM
Old 05-08-2013
O argv, argv, wherefore art thou argv?
All of my machines (various open source derivatives on x86 and amd64) store argv above the stack (at a higher memory address). I am curious to learn if any systems store argv below the stack (at a lower memory address).

I am particularly interested in proprietary Unices, such as Solaris, HP-UX, AIX, etc, although any reports are welcome. Please don't neglect to mention your operating system and cpu architecture in your post.

If you are inclined to help, please compile and execute the following small program:
Code:
#include <stdio.h>
#include <unistd.h>

int
main(int argc, char **argv)
{
    int x;

    printf("heap: %p\n", sbrk(0));
    printf("stack: %p\n", (void *) &x);
    printf("argv: %p\n", (void *) &argv);
    return 0;
}

The "stack: " line is just an approximation to the top of the stack, but it's good enough for my purposes.

A typical result from a 32-bit x86 Linux system:
Code:
heap: 0x804a000
stack: 0xbf9023ac
argv: 0xbf9023d4

Thank you in advance,
Alister
Last edited by alister; 05-08-2013 at 04:24 PM..
 

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LEARN ABOUT OPENSOLARIS

_stack_grow

_stack_grow(3C) 					   Standard C Library Functions 					   _stack_grow(3C)

NAME

       _stack_grow - express an intention to extend the stack

SYNOPSIS

       #include <ucontext.h>

       void *_stack_grow(void *addr);

DESCRIPTION

       The  _stack_grow()  function indicates to the system that the stack is  about to be extended to the address specified by addr. If extending
       the stack to this address would violate the stack boundaries as retreived by stack_getbounds(3C), a SIGSEGV is raised.

       If the disposition of SIGSEGV is SIG_DFL, the process is terminated and a core dump is generated.  If the application has installed its own
       SIGSEGV handler to run on the alternate signal stack, the signal information passed to the handler will be such that a call to stack_viola-
       tion(3C) with these parameters returns 1.

       The addr argument is a biased stack pointer value. See the Solaris 64-bit Developer's Guide.

       This function has no effect if the specified address, addr, is within the bounds of the current stack.

RETURN VALUES

       If the _stack_grow() function  succeeds and does not detect a stack violation, it returns addr.

ERRORS

       No errors are defined.

USAGE

       The _stack_grow() function does not actually adjust the stack pointer register. The  caller  is	responsible  for  manipulating	the  stack
       pointer register once _stack_grow() returns.

       The  _stack_grow()  function  is typically invoked by code created by the compilation environment prior to executing code that modifies the
       stack pointer. It can also be used by hand-written assembly routines to allocate stack-based storage safely.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Async-Signal-Safe 	   |
       +-----------------------------+-----------------------------+

SEE ALSO

       stack_getbounds(3C), stack_inbounds(3C), stack_violation(3C), attributes(5)

       Solaris 64-bit Developer's Guide

SunOS 5.11							    18 Jul 2002 						   _stack_grow(3C)
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