From: Bruno Haible <bruno@clisp.org>
To: 35553@debbugs.gnu.org
Subject: bug#35553: getlogin and getlogin_r fail with error ENXIO
Date: Sat, 04 May 2019 01:03:37 +0200 [thread overview]
Message-ID: <5210151.GY8qDU4yXC@omega> (raw)
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
next reply other threads:[~2019-05-03 23:04 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-03 23:03 Bruno Haible [this message]
2019-05-04 13:13 ` bug#35553: getlogin and getlogin_r fail with error ENXIO Danny Milosavljevic
2019-05-04 13:26 ` Bruno Haible
2019-05-07 10:18 ` Ludovic Courtès
2019-05-09 10:13 ` Ludovic Courtès
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