[Xapian-tickets] [Xapian] #651: Protect writable fds by setting filepos very high

[Xapian]

#651: Protect writable fds by setting filepos very high
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 Reporter:  Olly Betts     |             Owner:  Olly Betts
     Type:  enhancement    |            Status:  assigned
 Priority:  normal         |         Milestone:  2.0.0
Component:  Backend-Glass  |           Version:
 Severity:  normal         |        Resolution:
 Keywords:                 |        Blocked By:
 Blocking:                 |  Operating System:  All
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Comment (by Olly Betts):

 I wondered about mingw.  There's no pread/pwrite there it seems, but we
 can `lseek` to the max off_t value and then `write()` fails with `EINVAL`
 (tested with `_FILE_OFFSET_BITS` set to 64 which gives 64-bit `off_t`).

 We could probably use `ReadFile()` and `WriteFile()` instead of
 pread/pwrite.
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Ticket URL: <https://trac.xapian.org/ticket/651#comment:20>
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