XFCE, Xorg 1.17.1 and Fatal server error: xf86OpenConsole: Cannot open /dev/tty0 (No such file or directory)

[Jamenson Ferreira Espindula de Almeida Melo]

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Jaboatão dos Guararapes, Pernambuco, Brazil, 19 june 2015.

Subject: XFCE, Xorg 1.17.1 and Fatal server error: xf86OpenConsole:
Cannot open /dev/tty0 (No such file or directory)


Hi, everybody.

I just instaled XFCE according to instructions in a Linux From Scrach
(LFS) box.  I run "startxfce4" script, as a normal user, and I got this
error:

Fatal server error: xf86OpenConsole: Cannot open /dev/tty0 (No such file
or directory)



Searching the Internet, I found a thread explaining some of interest:


- ---------- start of text citation ----------

When attempting to open the console device during initialization, X
first tries to open /dev/tty0 in write-only mode, and if that fails it
attempts to open /dev/vc/0. If both attempts fail, the error message
below is logged. The message is incorrect because the errno is that
resulting from the failure to open /dev/vc/0.

    xf86OpenConsole: Cannot open /dev/tty0 ({strerror(errno)})

On a machine in which /dev/tty0 does exist but /dev/vc/0 does not, such
as my machine, the log misleadingly says:

    Fatal server error: [ 3167.976] xf86OpenConsole: Cannot open
    /dev/tty0 (No such file or directory)

This patch fixes the log to report the correct errno for each device.
The result is this log snippet:

    [ 3755.177] (WW) xf86OpenConsole: Failed to open /dev/tty0 for
    writing (Permission denied)

    [ 3755.177] (WW) xf86OpenConsole: Failed
    to open /dev/vc/0 for writing (No such file or directory)

    [ 3755.177] Fatal server error: [ 3755.177] xf86OpenConsole: Failed to
    open console device

Signed-off-by: Chad Versace <chad.versace at linux.intel.com>
 ---
 hw/xfree86/os-support/linux/lnx_init.c | 6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/hw/xfree86/os-support/linux/lnx_init.c \
b/hw/xfree86/os-support/linux/lnx_init.c
index 2176985..b1ad1a8 100644
- --- a/hw/xfree86/os-support/linux/lnx_init.c
+++ b/hw/xfree86/os-support/linux/lnx_init.c
@@ -96,13 +96,13 @@ \
xf86OpenConsole(void)
         while (tty0[i] != NULL) {
         if ((fd = open(tty0[i],O_WRONLY,0)) >= 0)
           break;
+           xf86Msg(X_WARNING, "xf86OpenConsole: Failed \
to open %s for"
+          "writing (%s)\n", tty0[i], strerror(errno));
           i++;
         }

         if (fd < 0)
- -        FatalError(
- -        "xf86OpenConsole: Cannot open /dev/tty0 (%s)\n",
- -        strerror(errno));
+        FatalError("xf86OpenConsole: Failed to open \
console device\n");

             if (xf86Info.ShareVTs)
             {
- --
1.7.7.4


- ---------- end of text citation ----------


In fact, when Xorg 1.17.1 is run as "root" user, the "xf86OpenConsole:
Cannot open /dev/tty0 (No such file or directory)" error message no
longer appears, sugesting some permission problem.

Detail: script "startx" of Xorg 1.17.1 is OK.  The Window Manager "twm"
is executed OK.  Aparently XFCE Desktop Manager is the problem.

Question: What is the problem? How can I solve it?


XFCE Core packages compiled and installed (according to
http://www.linuxfromscratch.org/blfs/view/systemd/xfce/xfce-core.html):


    libxfce4util-4.10.1
    Xfconf-4.10.0
    libxfce4ui-4.10.0
    Exo-0.10.2
    Garcon-0.3.0
    gtk-xfce-engine-3.0.1
    libwnck-2.30.7
    libxfcegui4-4.10.0
    xfce4-panel-4.10.1
    xfce4-xkb-plugin-0.5.6
    Thunar-1.6.4
    thunar-volman-0.8.0
    Tumbler-0.1.30
    xfce4-appfinder-4.10.1
    xfce4-power-manager-1.4.2
    xfce4-settings-4.10.1
    Xfdesktop-4.10.3
    Xfwm4-4.10.1
    xfce4-session-4.10.1


Thank you.



Jamenson Ferreira Espindula de Almeida Melo
GNU/Linux user # 166197
https://linuxcounter.net/cert/166197.png

Key fingerprint: 234D 1914 4224 7C53 BD13 6855 2AE0 25C0 08A8 6180


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