[PostGIS] #5841: Pg18 changes pqsignal() return

[PostGIS]

#5841: Pg18 changes pqsignal() return
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  Reporter:  pramsey  |      Owner:  pramsey
      Type:  defect   |     Status:  new
  Priority:  medium   |  Milestone:  PostGIS 3.6.0
 Component:  postgis  |    Version:  master
Resolution:           |   Keywords:
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Comment (by pramsey):

 The correct answer is to not try to catch signals at all, leave that to
 PostgreSQL. Instead, just look at the current value of `QueryCancelPending
 || ProcDiePending` from `miscadmin.h` to find out what the interrupt state
 is. This turns out to be not hard to do with the existing callback
 facilities in geos and liblwgeom.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5841#comment:1>
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