[Xapian-tickets] [Xapian] #651: Avoid low fds

[Xapian]

#651: Avoid low fds
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 Reporter:  olly           |             Owner:  olly
     Type:  enhancement    |            Status:  new
 Priority:  normal         |         Milestone:  1.3.3
Component:  Backend-Glass  |           Version:
 Severity:  normal         |        Resolution:
 Keywords:                 |        Blocked By:
 Blocking:                 |  Operating System:  All
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Comment (by olly):

 It occurs to me that a simple general measure to make database tables much
 safer from writes to their fd (e.g. by user code or another library that
 previously had that fd open) would be to {{{lseek()}}} to way beyond the
 end of the file right after opening it for writing.  Doing so is
 documented to not change the file size (unless data is actually written),
 and calls to {{{pread()}}} and {{{pwrite()}}} are documented to not change
 the file offset.

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Ticket URL: <http://trac.xapian.org/ticket/651#comment:2>
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