[Bug 1032740] Re: libc6 isn't returning a valid user in char *getlogin()

[bcrowell]

---- rintintin ~ $ lsb_release -a
LSB Version:	core-2.0-amd64:core-2.0-noarch:core-3.0-amd64:core-3.0-noarch:core-3.1-amd64:core-3.1-noarch:core-3.2-amd64:core-3.2-noarch:core-4.0-amd64:core-4.0-noarch
Distributor ID:	Ubuntu
Description:	Ubuntu 12.04.1 LTS
Release:	12.04
Codename:	precise
---- rintintin ~ $ cat >gl.c
#include <unistd.h>
#include <stdio.h>

int main(void) {
   puts(getlogin());
   return 0;
}
---- rintintin ~ $ gcc gl.c && ulimit -c unlimited && ./a.out
Segmentation fault (core dumped)

I'll attach the core dump.

** Attachment added: "core dump"
   https://bugs.launchpad.net/ubuntu/+source/eglibc/+bug/1032740/+attachment/3475864/+files/core

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https://bugs.launchpad.net/bugs/1032740

Title:
  libc6 isn't returning a valid user in char *getlogin()

Status in “eglibc” package in Ubuntu:
  Confirmed

Bug description:
  A simple c program in my machine demonstrate what is happening.

  #include <unistd.h>
  #include <stdio.h>

  int main( int argc, char *argv[] ) {
      char *name;
      name = getlogin();
      if (name != NULL)
          printf("%s\n", name);
      else
          printf("name is null\n");
      return 0;
  }

  I'm just compiling and running it and name aways come as NULL;
  Note that i'm not a C developer, i got this when my python tests broke with os.getlogin.

  Thank you

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: libc6 2.15-0ubuntu10
  ProcVersionSignature: Ubuntu 3.2.0-27.43-generic-pae 3.2.21
  Uname: Linux 3.2.0-27-generic-pae i686
  ApportVersion: 2.0.1-0ubuntu11
  Architecture: i386
  Date: Fri Aug  3 14:16:20 2012
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: eglibc
  UpgradeStatus: Upgraded to precise on 2012-07-02 (32 days ago)

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