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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 CENTOS

avahi-dnsconfd.action

avahi-dnsconfd.action(8)				      System Manager's Manual					  avahi-dnsconfd.action(8)

NAME

       avahi-dnsconfd.action - avahi-dnsconfd action script

SYNOPSIS

       /home/lennart/tmp/avahi/etc/avahi/avahi-dnsconfd.action

DESCRIPTION

       avahi-dnsconfd.action  is  the  action  script  that is called whenever a new unicast DNS server is found or removed by avahi-dnsconfd. The
       default script as shipped with avahi patches /etc/resolv.conf to reflect the changed unicast DNS server configuration.

PARAMETERS

       argv[1] Contains the character "+" if the DNS server is new, "-" when it shall be removed from the DNS server list.

       argv[2] The IP address of the DNS server.

       argv[3] Numerical network interface number this DNS server was found on.

       argv[4] Numerical protocol number this DNS server was found on. (usually 2 for IPv4 and 10 for IPv6)

ENVIRONMENT

       AVAHI_INTERFACE Contains the textual interface name the corresponds with argv[3]. (e.g. "eth0")

       AVAHI_INTERFACE_DNS_SERVERS Contains a list of all DNS servers that avahi-dnsconfd found on the interface  $AVAHI_INTERFACE,  separated	by
       spaces.

       AVAHI_DNS_SERVERS Contains a list of all DNS server that avahi-dnsconfd found on all interfaces, separated by spaces.

AUTHORS

       The Avahi Developers <avahi (at) lists (dot) freedesktop (dot) org>; Avahi is available from http://avahi.org/

SEE ALSO

       avahi-dnsconfd(8), avahi-daemon(8)

COMMENTS

       This man page was written using xml2man(1) by Oliver Kurth.

Manuals 							       User						  avahi-dnsconfd.action(8)
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