GNU bug report logs - #35553
getlogin and getlogin_r fail with error ENXIO

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#35553: closed (getlogin and getlogin_r fail with error ENXIO)
Date: Thu, 09 May 2019 10:15:03 +0000

[Message part 1 (text/plain, inline)]

Your message dated Thu, 09 May 2019 12:13:54 +0200
with message-id <87pnosexzx.fsf <at> gnu.org>
and subject line Re: bug#35553: getlogin and getlogin_r fail with error ENXIO
has caused the debbugs.gnu.org bug report #35553,
regarding getlogin and getlogin_r fail with error ENXIO
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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35553: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=35553
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From: Bruno Haible <bruno <at> clisp.org>
To: bug-guix <at> gnu.org
Subject: getlogin and getlogin_r fail with error ENXIO
Date: Sat, 04 May 2019 01:03:37 +0200

Hi,

Running the guix-1.0 installation image
(guix-system-vm-image-1.0.0.x86_64-linux) in qemu, I find that the
glibc functions getlogin() and getlogin_r() fail with error ENXIO.

Using the gnulib programs test-getlogin and test-getlogin_r I can see
that the program is reading the contents of the file /proc/self/loginuid
and its contents is "4294967295". Indeed, the file
glibc/sysdeps/unix/sysv/linux/getlogin_r.c contains this code:

  /* If there is no login uid, linux sets /proc/self/loginid to the sentinel
     value of, (uid_t) -1, so check if that value is set and return early to
     avoid making unneeded nss lookups. */
  if (uid == (uid_t) -1)
    {
      __set_errno (ENXIO);
      return ENXIO;
    }

Is it the xfce4 desktop which is not setting a loginuid? Or is it the lack
of a login screen?

It's the first Linux distro I've seen where getlogin() and getlogin_r()
fail when the user is running a normal desktop environment.

Bruno

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From: Ludovic Courtès <ludo <at> gnu.org>
To: Danny Milosavljevic <dannym <at> scratchpost.org>
Cc: Bruno Haible <bruno <at> clisp.org>, 35553-done <at> debbugs.gnu.org
Subject: Re: bug#35553: getlogin and getlogin_r fail with error ENXIO
Date: Thu, 09 May 2019 12:13:54 +0200

Hello,

Danny Milosavljevic <dannym <at> scratchpost.org> scribes:

> We don't refer to pam_loginuid.so anywhere, so it's understandable that
> /proc/self/loginuid is not set either.

I proceeded as discussed:

  https://git.savannah.gnu.org/cgit/guix.git/commit/?id=e6b1a2248ff164e14d1b2f495224faf8a8326142
  https://git.savannah.gnu.org/cgit/guix.git/commit/?id=af55ca481d9e6c1d1e06632f96d550b42f33210f

Thanks,
Ludo’.

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