In src/exec/dpexec/dxmain.c (line 1283) it is doing
gethostname(_dxd_exHostName, MAXHOSTNAMELEN);
if ( ExHostToFQDN(_dxd_exHostName, _dxd_exHostName ) == ERROR )
the ExHostToFQDN does a 'gethostbyname' which fails.
Seems the gethostname does not return a valid hostname (which has been
set by sethostname). I don't think it uses the 'HOSTNAME' environment
variable at all.
Could it be that Apache is passing on a stripped 'environment'?
Can you explicitly provide a host on the command line when you invoke Dx?
Mattijs
Matthias Kraatz wrote:
Hello everyone,
I would like to provide a service to the collegues in my workgroup where
there can upload a datafile and get a graphics image in return (since -
unlike me - not everybody is thrilled by the hassle of working dx,
though appriciating dx's superior graphics qualities).
Easy I thought, I just have to make a system call from a cgi-script like
"dx -script somescriptfile"
after appropriately modefying somescriptfile so it contains the correct
name of the uploaded file.
But doing so I get this odd error message from dx:
<quote>
Starting DX executive
Open Visualization Data Explorer
More Info at www.research.ibm.com/dx
and www.opendx.org
Version - 4.3.0
Memory cache will use 256 MB (16 for small items, 240 for large)
0: ERROR: gethostbyname returned error
0: ERROR: Unexpected error: gethostbyname error--is it possible this
machine doesn't have a DNS/host entry?
Error during Initialization
gethostbyname error--is it possible this machine doesn't have a DNS/host
entry?
ExHostToFQDN failed
</quote>
This does not happen when I invoke the script manually from the shell.
Maybe the root cause is not dx but the underlying system.
I am using apache 1.3, cygwin 1.5, win2k pro as dev-environment. I have
not checked if the same error occurs under solaris2.9.
I am aware that the apache daemon receives only a limited environment
variable set, but I have passed a whole lot I considered to be important
like HOSTNAME, OSTYPE, the DX variables. Are the any other pertinent
variables that I forgot?
It would be interesting to know if anyone else has tried something
similar like webinterfacing the script facility of dx or if anyone has
the slightest idea where the error quoted above comes from.
Thanks and best regards,
Matthias Kraatz
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