Berkeley DB Reference Guide:
Programmer Notes

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Run-time configuration

There are a few interfaces that support run-time configuration of Berkeley DB. First is a group of interfaces that allow applications to intercept Berkeley DB requests for underlying library or system call functionality:

db_env_set_func_close
db_env_set_func_dirfree
db_env_set_func_dirlist
db_env_set_func_exists
db_env_set_func_free
db_env_set_func_fsync
db_env_set_func_ioinfo
db_env_set_func_malloc
db_env_set_func_map
db_env_set_func_open
db_env_set_func_read
db_env_set_func_realloc
db_env_set_func_seek
db_env_set_func_sleep
db_env_set_func_unlink
db_env_set_func_unmap
db_env_set_func_write
db_env_set_func_yield

These interfaces are only available from the Berkeley DB C language API.

In addition, there are a few interfaces that allow applications to re-configure, on an application-wide basis, Berkeley DB behaviors.

db_env_set_mutexlocks
db_env_set_pageyield
db_env_set_panicstate
db_env_set_region_init
db_env_set_tas_spins

These interfaces are available from all of the Berkeley DB programmatic APIs.

A not-uncommon problem for applications is the new API in Solaris 2.6 for manipulating large files. As this API was not part of Solaris 2.5, it is difficult to create a single binary that takes advantage of the large file functionality in Solaris 2.6 but which still runs on Solaris 2.5. Example code that supports this is included.

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