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db/hash.c: Do not return an error when opening a missing database with O_CREAT
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Authored by bnovkov on Jul 24 2025, 3:52 PM.
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Details

Summary

dbm_open currently returns an error when opening a missing database
with O_CREAT but creates the request database file. This is caused
by a buggy check in __hash_open which attempts to detect a new
(or empty) database file, but fails to take the O_CREAT flag into
account.

Fix this by expanding the check to include O_CREAT.

Fixes: edcdc752ecdd
Sponsored by: Klara, Inc.

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rG FreeBSD src repository
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Buildable 65655
Build 62538: arc lint + arc unit