[debbugs-tracker] bug#35553: closed (getlogin and getlogin_r fail with error ENXIO)

[GNU bug Tracking System]

Your message dated Thu, 09 May 2019 12:13:54 +0200
with message-id <address@hidden>
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.

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-- 
35553: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=35553
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> --- Begin Message ---
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>
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> Subject: 
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> getlogin and getlogin_r fail with error ENXIO
>
>
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> Date: 
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> Sat, 04 May 2019 01:03:37 +0200
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>
> User-agent: 
>
> KMail/5.1.3 (Linux/4.4.0-145-generic; KDE/5.18.0; x86_64; ; )
>
>
>
>
> 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
>
>
>
>
> --- End Message ---
> --- Begin Message ---
>
>
>
> Subject: 
>
> Re: bug#35553: getlogin and getlogin_r fail with error ENXIO
>
>
>
>
> Date: 
>
> Thu, 09 May 2019 12:13:54 +0200
>
>
>
>
> User-agent: 
>
> Gnus/5.13 (Gnus v5.13) Emacs/26.2 (gnu/linux)
>
>
>
>
> Hello,
>
> Danny Milosavljevic <address@hidden> 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’.
>
>
> --- End Message ---