[GRASS-dev] Re: [GRASS GIS] #843: v.digit broken on new WinGrass release

[GRASS GIS]

#843: v.digit broken on new WinGrass release
---------------------------+------------------------------------------------
  Reporter:  cnielsen      |       Owner:  grass-dev at lists.osgeo.org
      Type:  defect        |      Status:  new                      
  Priority:  critical      |   Milestone:  6.4.0                    
 Component:  Vector        |     Version:  unspecified              
Resolution:                |    Keywords:  wingrass,v.digit         
  Platform:  MSWindows XP  |         Cpu:  x86-64                   
---------------------------+------------------------------------------------
Comment (by glynn):

 Replying to [comment:9 marisn]:

 > > Huh? That matches the error message, but v.digit shouldn't be using
 lib/form. It has its '''own embedded copy''' of the form library.

 > "Own embedded copy" is a good reason for trouble. Before r38954 form lib
 was out of sync. If lib/form was broken before r38954 then something else
 was broken too (nviz? d.what?).

 By "embedded", I mean "in-process". The form library in lib/form consists
 of a custom "wish" which has a command for executing SQL, and a library
 which spawns this as a slave process. The version in v.digit doesn't use a
 separate child process; the form code has been merged into the main
 v.digit program (which is also a custom wish).

 The separate form library is still used by nviz and d.what.vect.

 > Unfortunately I have no idea about sockets/pipes on windows. According
 to lib/form history, Glynn should have an idea how sockets/pipes/etc.
 works on Windows.

 I don't have much of an idea either. I do know that Windows doesn't
 understand Unix-domain sockets (so no socketpair()). It does have a
 _pipe() function which is roughly equivalent to the Unix version, but the
 lack of fork() means that creating a slave process is nothing like on
 Unix.

-- 
Ticket URL: <https://trac.osgeo.org/grass/ticket/843#comment:10>
GRASS GIS <http://grass.osgeo.org>