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<h2 class="title" style="clear: both"><a id="envcreate"></a>db_env_create</h2>
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<pre class="programlisting">#include <db.h>
int
db_env_create(DB_ENV **dbenvp, u_int32_t flags); </pre>
<p>
The <code class="function">db_env_create()</code> function creates a <code class="classname">DB_ENV</code>
structure that is the handle for a Berkeley DB environment. This function allocates memory for the structure,
returning a pointer to the structure in the memory to which
<span class="bold"><strong>dbenvp</strong></span> refers. To release the allocated memory and discard the
handle, call the
<a class="xref" href="envclose.html" title="DB_ENV->close()">DB_ENV->close()</a> or
<a class="xref" href="envremove.html" title="DB_ENV->remove()">DB_ENV->remove()</a> methods.
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<p>
<code class="classname">DB_ENV</code> handles are free-threaded if the
<a class="link" href="envopen.html#envopen_DB_THREAD">DB_THREAD</a> flag is specified to the
<a class="xref" href="envopen.html" title="DB_ENV->open()">DB_ENV->open()</a> method when the environment is opened.
The <code class="classname">DB_ENV</code> handle should not be closed while any other handle
remains open that is using it as a reference (for example,
<a class="link" href="db.html" title="Chapter 2. The DB Handle">DB</a> or <a class="link" href="txn.html" title="Chapter 12. The DB_TXN Handle">DB_TXN</a>).
Once either the
<a class="xref" href="envclose.html" title="DB_ENV->close()">DB_ENV->close()</a> or
<a class="xref" href="envremove.html" title="DB_ENV->remove()">DB_ENV->remove()</a>
methods are called, the handle may not be accessed again, regardless of the method's return.
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<p>
Before the handle may be used, you must open it using the
<a class="xref" href="envopen.html" title="DB_ENV->open()">DB_ENV->open()</a>
method.
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<p>
The DB_ENV handle contains a special field, <code class="literal">app_private</code>, which is declared as type
<code class="literal">void *</code>. This field is
provided for the use of the application program. It is initialized to NULL and is not further used by
Berkeley DB in any way.
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<p>
The <code class="function">db_env_create()</code> method returns a non-zero error value on failure and 0 on success.
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The <span class="bold"><strong>flags</strong></span> parameter must be set to 0.
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<p>
<a class="link" href="env.html" title="Chapter 5. The DB_ENV Handle">DB_ENV</a>
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<h3 class="title"><a id="id1660937"></a>See Also</h3>
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<a class="xref" href="env.html#envlist" title="Database Environments and Related Methods">Database Environments and Related Methods</a>
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