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13<b>db_env_set_func_pread</b>
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21<b><pre>
22#include &lt;db.h&gt;
23<p>
24int
25db_env_set_func_pread(ssize_t (*func_pread)(int fd, void *buf, size_t nbytes, off_t offset));
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28<b>Description: db_env_set_func_pread</b>
29<p>Replace Berkeley DB calls to the IEEE/ANSI Std 1003.1 (POSIX) <b>pread</b> function with
30<b>func_pread</b>, which must conform to the standard interface
31specification.</p>
32<p>The db_env_set_func_pread method configures all operations performed by a process and
33all of its threads of control, not operations confined to a single
34database environment.</p>
35<p>Although the db_env_set_func_pread method may be called at any time during the life of
36the application, it should normally be called before making calls to the
37<a href="/api_c/env_class.html">db_env_create</a> or <a href="/api_c/db_class.html">db_create</a> methods.</p>
38<p>The db_env_set_func_pread method
39returns a non-zero error value on failure
40and 0 on success.
41</p>
42<b>Parameters</b> <br>
43 <b>func_pread</b><ul compact><li>The <b>func_pread</b> parameter is the replacement function.  It must conform
44to the standard interface specification.</ul>
45<br>
46<br><b>See Also</b>
47<a href="/ref/program/runtime.html">Run-time configuration</a>
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