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db_env_set_func_ioinfo
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#include &lt;db.h&gt;

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));
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Description: db_env_set_func_ioinfo
The Berkeley DB library requires the ability to determine the size and I/O
characteristics of a file.
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.
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.
The db_env_set_func_ioinfo method
returns a non-zero error value on failure
and 0 on success.

Parameters 
 func_ioinfo<ul compact><li>The func_ioinfo parameter is the function which returns the size
and I/O characteristics of a file.
The path parameter is the pathname of the file to be checked, and the
fd parameter is an open file descriptor on the file.
If the mbytesp and bytesp parameters are non-NULL, the
ioinfo function must return in them the size of the file: the
number of megabytes in the file into the memory location to which the
mbytesp parameter refers, and the number of bytes over and above
that number of megabytes into the memory location to which the
bytesp parameter refers.
In addition, if the iosizep parameter is non-NULL, the ioinfo
function must return the optimum granularity for I/O operations to the file
into the memory location to which it refers.
The func_ioinfo function must return the value of errno on
failure and 0 on success.</ul>
 
 See Also
<a href="../../db4-devel-4.7.25/ref/program/runtime.html">Run-time configuration</a>
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