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+<!-- keywords: SQLITE_IOCAP_ATOMIC SQLITE_IOCAP_ATOMIC16K SQLITE_IOCAP_ATOMIC1K SQLITE_IOCAP_ATOMIC2K SQLITE_IOCAP_ATOMIC32K SQLITE_IOCAP_ATOMIC4K SQLITE_IOCAP_ATOMIC512 SQLITE_IOCAP_ATOMIC64K SQLITE_IOCAP_ATOMIC8K SQLITE_IOCAP_BATCH_ATOMIC SQLITE_IOCAP_IMMUTABLE SQLITE_IOCAP_POWERSAFE_OVERWRITE SQLITE_IOCAP_SAFE_APPEND SQLITE_IOCAP_SEQUENTIAL SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN -->
+<div class=nosearch>
+<a href="intro.html"><h2>SQLite C Interface</h2></a>
+<h2>Device Characteristics</h2>
+</div>
+<blockquote><pre>
+#define SQLITE_IOCAP_ATOMIC                 0x00000001
+#define SQLITE_IOCAP_ATOMIC512              0x00000002
+#define SQLITE_IOCAP_ATOMIC1K               0x00000004
+#define SQLITE_IOCAP_ATOMIC2K               0x00000008
+#define SQLITE_IOCAP_ATOMIC4K               0x00000010
+#define SQLITE_IOCAP_ATOMIC8K               0x00000020
+#define SQLITE_IOCAP_ATOMIC16K              0x00000040
+#define SQLITE_IOCAP_ATOMIC32K              0x00000080
+#define SQLITE_IOCAP_ATOMIC64K              0x00000100
+#define SQLITE_IOCAP_SAFE_APPEND            0x00000200
+#define SQLITE_IOCAP_SEQUENTIAL             0x00000400
+#define SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN  0x00000800
+#define SQLITE_IOCAP_POWERSAFE_OVERWRITE    0x00001000
+#define SQLITE_IOCAP_IMMUTABLE              0x00002000
+#define SQLITE_IOCAP_BATCH_ATOMIC           0x00004000
+</pre></blockquote>
+<p>
+The xDeviceCharacteristics method of the <a href="../c3ref/io_methods.html">sqlite3_io_methods</a>
+object returns an integer which is a vector of these
+bit values expressing I/O characteristics of the mass storage
+device that holds the file that the <a href="../c3ref/io_methods.html">sqlite3_io_methods</a>
+refers to.</p>
+
+<p>The SQLITE_IOCAP_ATOMIC property means that all writes of
+any size are atomic.  The SQLITE_IOCAP_ATOMICnnn values
+mean that writes of blocks that are nnn bytes in size and
+are aligned to an address which is an integer multiple of
+nnn are atomic.  The SQLITE_IOCAP_SAFE_APPEND value means
+that when data is appended to a file, the data is appended
+first then the size of the file is extended, never the other
+way around.  The SQLITE_IOCAP_SEQUENTIAL property means that
+information is written to disk in the same order as calls
+to xWrite().  The SQLITE_IOCAP_POWERSAFE_OVERWRITE property means that
+after reboot following a crash or power loss, the only bytes in a
+file that were written at the application level might have changed
+and that adjacent bytes, even bytes within the same sector are
+guaranteed to be unchanged.  The SQLITE_IOCAP_UNDELETABLE_WHEN_OPEN
+flag indicates that a file cannot be deleted when open.  The
+SQLITE_IOCAP_IMMUTABLE flag indicates that the file is on
+read-only media and cannot be changed even by processes with
+elevated privileges.</p>
+
+<p>The SQLITE_IOCAP_BATCH_ATOMIC property means that the underlying
+filesystem supports doing multiple write operations atomically when those
+write operations are bracketed by <a href="../c3ref/c_fcntl_begin_atomic_write.html#sqlitefcntlbeginatomicwrite">SQLITE_FCNTL_BEGIN_ATOMIC_WRITE</a> and
+<a href="../c3ref/c_fcntl_begin_atomic_write.html#sqlitefcntlcommitatomicwrite">SQLITE_FCNTL_COMMIT_ATOMIC_WRITE</a>.
+</p><p>See also lists of
+  <a href="objlist.html">Objects</a>,
+  <a href="constlist.html">Constants</a>, and
+  <a href="funclist.html">Functions</a>.</p>
+