Debian Bug report logs - #58322
can't "p environ"

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Message #5 received at [email protected] (full text, mbox, reply):

From: shaslam <[email protected]>

To: Debian Bug Tracking System <[email protected]>

Subject: can't "p environ"

Date: Thu, 17 Feb 2000 17:20:31 +0000

Package: gdb
Version: 4.18.19990928-1
Severity: normal

I wrote envstuff.c:

#include <stdlib.h>
#include <stdio.h>

extern char **environ;

int main(int argc, char **argv, char **env)
{
  printf("argc=%d argv=%p env=%p environ=%p\n", argc, argv, env, environ);
  exit(0);
}

and compiled it (gcc -ggdb envstuff.c -o envstuff)

It produces this output:

bash$ ./envstuff 
argc=1 argv=0xbffff8d4 env=0xbffff8dc environ=0xbffff8dc

but when in gdb, I get:

(gdb) b main
Breakpoint 1 at 0x8048486: file envstuff.c, line 8.
(gdb) r
Starting program: /usr/home/shaslam/perltest/envstuff 

Breakpoint 1, main (argc=1, argv=0xbffff8c4, env=0xbffff8cc) at envstuff.c:8
8	  printf("argc=%d argv=%p env=%p environ=%p\n", argc, argv, env,
environ);
(gdb) p env
$1 = (char **) 0xbffff8cc
(gdb) p environ
$2 = (char **) 0x0

?

bash$ gcc -v
Reading specs from /usr/lib/gcc-lib/i386-linux/2.95.2/specs
gcc version 2.95.2 20000116 (Debian GNU/Linux)

SRH
-- System Information
Debian Release: 2.2
Architecture: i386
Kernel: Linux hell 2.2.14 #1-DellLatCPi Thu Jan 6 20:47:36 GMT 2000 i686

Versions of packages gdb depends on:
ii  libc6                         2.1.3-2    GNU C Library: Shared libraries an
ii  libncurses4                   4.2-8      Shared libraries for terminal hand

Message #10 received at [email protected] (full text, mbox, reply):

From: Matthew Wilcox <[email protected]>

To: [email protected]

Subject: Confirmed

Date: Sun, 11 Jul 2004 15:18:43 +0100

This bug still occurs with gdb 6.1-3.

-- 
"Next the statesmen will invent cheap lies, putting the blame upon 
the nation that is attacked, and every man will be glad of those
conscience-soothing falsities, and will diligently study them, and refuse
to examine any refutations of them; and thus he will by and by convince 
himself that the war is just, and will thank God for the better sleep 
he enjoys after this process of grotesque self-deception." -- Mark Twain

Message #15 received at [email protected] (full text, mbox, reply):

From: Daniel Jacobowitz <[email protected]>

To: [email protected]

Subject: Cause of environ error

Date: Sat, 29 Sep 2007 17:51:12 -0400

(gdb) info var environ

Non-debugging symbols:
0x00000000006009a8  __environ@@GLIBC_2.2.5
0x00000000006009a8  environ@@GLIBC_2.2.5
0x00002aaaab01ca08  __environ
0x00002aaaab01ca08  _environ

GDB does not realize that the symbol in the application's dynbss
section is supposed to be the same as the symbol in the shared
libc.so.6.  There's a copy in the executable because of the R_386_COPY
relocation, necessary to ensure all shared libraries use the same copy.

-- 
Daniel Jacobowitz
CodeSourcery

Message #24 received at [email protected] (full text, mbox, reply):

From: Samuel Bronson <[email protected]>

To: [email protected]

Subject: Re: Bug#536024: gdb gets wrong address for glibc optind variable

Date: Tue, 29 Jan 2013 20:28:24 -0500

Package: gdb
Version: 7.4.1-1

This bug seems to have vanished at some point; I tried the testcase
provided at <http://sourceware.org/bugzilla/show_bug.cgi?id=8588> and
got the correct result.

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