[Rd] (PR#10379) Re: x11(....) kills R without DISPLAY

[p.dalgaard at biostat.ku.dk]

Hin-Tak Leung wrote:
> Peter Dalgaard wrote:
> <snipped>
>> You need x11() with a valid display to trigger the bug:
>>
>> [pd at titmouse2 BUILD]$ ssh -Y 192.168.1.10
>> pd at 192.168.1.10's password:
>> Last login: Sat Oct 27 02:40:16 2007 from 192.168.1.11
>> [pd at janus ~]$ echo $DISPLAY
>> localhost:10.0
>> [pd at janus ~]$ DISPLAY=3D R -q
>>  > x11("localhost:10.0")
>> Error: Couldn't find per display information
>> [pd at janus ~]$ uname -a
>> Linux janus 2.6.22.9-91.fc7 #1 SMP Thu Sep 27 20:47:39 EDT 2007=20
>> x86_64 x86_64 x86_64 GNU/Linux
>> [pd at janus ~]$ cat /etc/issue
>> Fedora release 7 (Moonshine)
>> Kernel \r on an \m
>
> Agh, sorry. Yes, x11() (with or without $DISPLAY set) doesn't
> die catatrophically, x11("validinfo") does.
>
> HTL
The culprit would seem to be this bit of devX11.c

1302                    xtdpy =3D XtOpenDisplay(app_con, NULL, "r_x11",=20
"R_x11",
1303                                          NULL, 0, &zero, NULL);
1304                    toplevel =3D XtAppCreateShell(NULL, "R_x11",

The 2nd arg to XtOpenDisplay is listed as display_string, so passing a=20
NULL here seems like trouble when the default ways of finding the=20
display do not work.

Looks like a fix is to insert p instead of NULL. (Tested rudimentarily.)



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