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<b>db_env_set_func_ioinfo</b>
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<b><pre>
#include <db.h>
<p>
int
db_env_set_func_ioinfo(int (*func_ioinfo)(const char *path,
int fd, u_int32_t *mbytesp, u_int32_t *bytesp, u_int32_t *iosizep));
</pre></b>
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<b>Description: db_env_set_func_ioinfo</b>
<p>The Berkeley DB library requires the ability to determine the size and I/O
characteristics of a file.</p>
<p>The db_env_set_func_ioinfo method configures all operations performed by a process and
all of its threads of control, not operations confined to a single
database environment.</p>
<p>Although the db_env_set_func_ioinfo method may be called at any time during the life of
the application, it should normally be called before making calls to the
<a href="../../db4-devel-4.7.25/api_c/env_class.html">db_env_create</a> or <a href="../../db4-devel-4.7.25/api_c/db_class.html">db_create</a> methods.</p>
<p>The db_env_set_func_ioinfo method
returns a non-zero error value on failure
and 0 on success.
</p>
<b>Parameters</b> <br>
<b>func_ioinfo</b><ul compact><li>The <b>func_ioinfo</b> parameter is the function which returns the size
and I/O characteristics of a file.
<p>The <b>path</b> parameter is the pathname of the file to be checked, and the
<b>fd</b> parameter is an open file descriptor on the file.</p>
<p>If the <b>mbytesp</b> and <b>bytesp</b> parameters are non-NULL, the
<b>ioinfo</b> function must return in them the size of the file: the
number of megabytes in the file into the memory location to which the
<b>mbytesp</b> parameter refers, and the number of bytes over and above
that number of megabytes into the memory location to which the
<b>bytesp</b> parameter refers.</p>
<p>In addition, if the <b>iosizep</b> parameter is non-NULL, the <b>ioinfo</b>
function must return the optimum granularity for I/O operations to the file
into the memory location to which it refers.</p>
<p>The <b>func_ioinfo</b> function must return the value of <b>errno</b> on
failure and 0 on success.</p></ul>
<br>
<br><b>See Also</b>
<a href="../../db4-devel-4.7.25/ref/program/runtime.html">Run-time configuration</a>
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