dbm(3x) discrepancy on Sun386i / Sun-3
Gerhard Fleischanderl
vexpert!gfl at relay.eu.net
Tue Oct 17 05:43:28 AEST 1989
When I tried to use a dbm database from Sun386i and Sun-3 (both running
SunOS 4.0.1), I encountered a strange effect. If the dbm file is created
on a Sun386i, I cannot read it from the Sun-3 (and vice versa) !
The dbm(3x) routines firstkey() and fetch() both report "bad block" and
dump core, when they access a dbm file created on the other architecture.
The respective ".pag" files, which are created by identical instructions,
differ in their 10 leading bytes obeying to the following pattern:
Byte | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
---------|-----|-----|-----|-----|-----|-----|-----|-----|-----|------|
Sun386i | A | B | C | D | E | F | G | H | I | J |
Sun-3 | B | A | D | C | F | E | H | G | J | I |
Maybe the difference in byte ordering on 68020 and 80386, resp., is the
reason for this incompatibility. An interesting aspect is that dbm files
created on a MicroVax (Ultrix 3.0) are identical to those from a Sun386i.
My priority question is: How can I access a dbm file, which has been
created on a Sun386i (== MicroVax), on a Sun-3? (I need this to run the
news software in a heterogeneous network.)
Any help will be appreciated. If I will receive anything interesting, I
will summarize to the list.
Gerhard Fleischanderl
Institut fuer Angewandte Informatik, Technical University Vienna
Paniglgasse 16, A-1040 Vienna, Austria
e-mail: gfl at vexpert.uucp
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