134 lines
4.7 KiB
HTML
134 lines
4.7 KiB
HTML
<!DOCTYPE html>
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<html><head>
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<link href="../sqlite.css" rel="stylesheet">
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<title>Virtual File System Objects</title>
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</head>
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<body>
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Small. Fast. Reliable.<br>Choose any three.
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<!-- keywords: sqlite3_vfs_find sqlite3_vfs_register sqlite3_vfs_unregister -->
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<div class=nosearch>
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<a href="intro.html"><h2>SQLite C Interface</h2></a>
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<h2>Virtual File System Objects</h2>
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</div>
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<blockquote><pre>
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sqlite3_vfs *sqlite3_vfs_find(const char *zVfsName);
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int sqlite3_vfs_register(sqlite3_vfs*, int makeDflt);
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int sqlite3_vfs_unregister(sqlite3_vfs*);
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</pre></blockquote>
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<p>
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A virtual filesystem (VFS) is an <a href="../c3ref/vfs.html">sqlite3_vfs</a> object
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that SQLite uses to interact
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with the underlying operating system. Most SQLite builds come with a
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single default VFS that is appropriate for the host computer.
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New VFSes can be registered and existing VFSes can be unregistered.
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The following interfaces are provided.</p>
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<p>The sqlite3_vfs_find() interface returns a pointer to a VFS given its name.
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Names are case sensitive.
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Names are zero-terminated UTF-8 strings.
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If there is no match, a NULL pointer is returned.
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If zVfsName is NULL then the default VFS is returned.</p>
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<p>New VFSes are registered with sqlite3_vfs_register().
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Each new VFS becomes the default VFS if the makeDflt flag is set.
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The same VFS can be registered multiple times without injury.
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To make an existing VFS into the default VFS, register it again
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with the makeDflt flag set. If two different VFSes with the
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same name are registered, the behavior is undefined. If a
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VFS is registered with a name that is NULL or an empty string,
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then the behavior is undefined.</p>
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<p>Unregister a VFS with the sqlite3_vfs_unregister() interface.
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If the default VFS is unregistered, another VFS is chosen as
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the default. The choice for the new VFS is arbitrary.
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</p><p>See also lists of
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<a href="objlist.html">Objects</a>,
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<a href="constlist.html">Constants</a>, and
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<a href="funclist.html">Functions</a>.</p>
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