Message with empty string ( I/O error during "open O_CREAT" operation for file 
"" ) when engine can't save data for GTT due to invalid value of FIREBIRD_TMP 
or when it points to inaccessible directory
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

                 Key: CORE-5052
                 URL: http://tracker.firebirdsql.org/browse/CORE-5052
             Project: Firebird Core
          Issue Type: Bug
          Components: Engine
    Affects Versions: 2.5.5
            Reporter: Pavel Zotov
            Priority: Trivial


Name of directory which should store data of GTT is not shown when FIREBIRD_TMP 
variable is undefined or points to invalid/inaccessible folder. 
Instead of this something quite useless issues:

/opt/fb25sc/bin/isql /3255:/var/db/fb25/empty.fdb

recreate global temporary table gtt(x int);  --this passed OK
insert into gtt values(1); -- this FAILS
Statement failed, SQLSTATE = 08001
I/O error during "open O_CREAT" operation for file ""
-Error while trying to create file
-No such file or directory

After this one need to open script that launched FB ( /etc/init.d/... ) and 
ensure that variable FIREBIRD_TMP:
1) is defined
2) points to valid directory which does exist and is avail for FB
3) is exported to daemon process.

But starting script can become suddenly  "obsolete" when FB 2.5.x is 
reassembled and begin to work in another arch (e.g. Classic instead of old SC; 
thus script that should be checked is /etc/xinetd rather than /etc/fb25sc).

So, it would be nice to fix this inconvenice.

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