Here's a patch to 3/2/01 CVS which beefs up Distributed DX a bit.
These were made to get our IBM SP nodes crunching DX from our SGIs using
Execution Groups.

By default, DX makes these assumptions for Execution Groups:

     - rsh is used for passwordless remote login (/usr/bin/rsh)
     - the machines are in the same domain (or gethostname() returns
       a full path -- not common)
     - the username on the remote system is the same as on the local system
     - the directory structure (DXROOT, macros, MDF files, etc.) installed
       locally are all installed and installed in the same location on the
       other end

With the patch, the default behavior is the same, but can be modified as
follows:

     - The default command "rsh" has been left in place, but
       a user-specified remote shell command can be specified via the
       $DX_RSH environment variable, 

     - FQDNs (full host paths) are used under the hood when avaialble when
       creating the remote "invoke dxexec" script and connecting back to
       the master exec, 
       
     - Users can now enter host names of the form "[EMAIL PROTECTED]" in the
       Execute Group Assignment... dialog, and

     - setting $DX_RSH_NOENV in the local environment prevents the remote
       "invoke dxexec" script from being written with a full carbon copy of
       the local environment (only $DISPLAY is set)

Under the hood, I dumped pcreateve on SGI in favor of vfork/fork and exec
for kicking off rsh.  pcreateve is just too picky about compilation options
and environment, but vfork/exec seems to work well with everything I've
tried.

Also, I noticed that the platform-specific boiler-plate RSH macro code is
in DXChild.C and conn.c -- I copied it into remote.c.  We may want to make
a general header for it or generalize this into the configure script
someday.

Randy

-- 
Randall Hopper (mailto:[EMAIL PROTECTED])
Lockheed Martin Operation Support
EPA Scientific Visualization Center
US EPA MD/24 ERC-1A; RTP, NC 27711
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