dpy = XOpenDisplay (NULL) meeting exception

Bug #234886 reported by apex
Affects Status Importance Assigned to Milestone
Moblin UI Framework
Fix Released

Bug Description

I want to use X11 API to get some display information.
in the entry funtion, I call XOpenDisplay() to get a display structure, the API meeting the segment fault exception.

Revision history for this message
apex (feng-f-li) wrote :

OS: using image-create to build a one, FULL Stack + Development tools
hardware: Intel SDP for Menlow

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Loïc Minier (lool) wrote :

Could you please attach a sample program reproducing the error?

Loïc Minier (lool)
Changed in moblin-ui-framework:
status: New → Incomplete
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apex (feng-f-li) wrote :

the sample code,
./DisplayTest main entry

// rebuild steps
make clean

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apex (feng-f-li) wrote :

Error Information:

ume@ume:~/TestSuites/Display$ ./DisplayTest
testing sample is running
X connection to localhost:10.0 broken (explicit kill or server shutdown).

Revision history for this message
Loïc Minier (lool) wrote :

The sample doesn't build for me:
g++ -g -Wall -fPIC -DPIC -fpermissive -Dlinux -D__int32=int -D__int64="long long" -c x11_util.cpp -o x11_util.o
In file included from x11_util.cpp:53:
/usr/include/X11/extensions/randrproto.h:379: error: expected unqualified-id before ‘delete’
x11_util.cpp: In function ‘int X11GetScreenSizeCount(unsigned int)’:
x11_util.cpp:106: warning: comparison between signed and unsigned integer expressions
x11_util.cpp:112: warning: invalid conversion from ‘unsigned int*’ to ‘int*’

Does your code work under regular Ubuntu (not UME)?

Revision history for this message
apex (feng-f-li) wrote :

please change the "delete" to "deleteAA",
delete is c++ keyword, so we need change it to anyother words. ( I don't know how to let g++ compiler to omit this keyword)

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Loïc Minier (lool) wrote :

It doesn't crash here, neither on my desktop nor on my Q1 running UME.

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apex (feng-f-li) wrote :

your Q1 is Sumsung Q1 Ultra?,

I have a Sugsung Q1 ultra device, it installed the Macslin image and my sample code is run OK.
but now, I need to test my sample code on menlow platform.
my image is create by Image-creator tool ,
I select menlow-lpia, there are some other choice like ((menlow-lpia-hardy? ), I don't know what is the difference, and did not find any document to explain it. if you know , please tell me .
then i select the full-stack-with-properity + development tools
at last, create a install image to my USB disk and use the USB disk on SDP.
my hardware is Intel SDP for menlow platform.

so any mistakes in my process ?

Revision history for this message
apex (feng-f-li) wrote :

test my code on menlow-lpia-hardy-ppa , it can run sucessfully , my fail target is menlow-lpia.
menlow -lpia is ubuntu7.10 , while menlow-lpia-hardy-ppa is ubuntu8.04, mighbe it is the reason.

compare with normal ubuntu, my code
dpy = XOpenDisplay (NULL) can not work when use ssh terminal
it should change to dpy = XOpenDisplay("localhost:0.0")

thanks all. ( Loïc Minier,wang,<email address hidden>, tang, <email address hidden> )

the bug can be closed,

Revision history for this message
yanglei (lei-a-yang) wrote :

Moblin QA team close the bug according apex's latest comments.
If anyone found the same issue, please help to reopen the bug.

Changed in moblin-ui-framework:
status: Incomplete → Fix Released
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