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-<h2>device_write</h2>
-<hr>
-<p>
-<strong>Function</strong> - Write a sequence of bytes to a specific device.
-<h3>SYNOPSIS</h3>
-<pre>
-<strong>#include<device/device.h></strong>
-
-<strong>kern_return_t device_write</strong>
- <strong>(device_t</strong> <var>device</var>,
- <strong>mach_port_t</strong> <var>reply_port</var>,
- <strong>dev_mode_t</strong> <var>mode</var>,
- <strong>recnum_t</strong> <var>recnum</var>,
- <strong>io_buf_ptr_t</strong> <var>data</var>,
- <strong>mach_msg_type_number_t</strong> <var>data_count</var>,
- <strong>io_buf_len_t</strong> <var>io_buf_len_t</var><strong>);</strong>
-
-
-<strong>#include<device/device_request.h></strong>
-
-<strong>kern_return_t device_write_request</strong>
- <strong>(mach_port_t</strong> <var>device</var>,
- <strong>mach_port_t</strong> <var>reply_port</var>,
- <strong>dev_mode_t</strong> <var>mode</var>,
- <strong>recnum_t</strong> <var>recnum</var>,
- <strong>io_buf_ptr_t</strong> <var>data</var>,
- <strong>mach_msg_type_number_t</strong> <var>data_count</var><strong>);</strong>
-
-
-<strong>kern_return_t ds_device_write_reply</strong>
- <strong>(mach_port_t</strong> <var>reply_port</var>,
- <strong>kern_return_t</strong> <var>return_code</var>,
- <strong>io_buf_len_t</strong> <var>bytes_written</var><strong>);</strong>
-</pre>
-<h3>PARAMETERS</h3>
-<dl>
-<p>
-<dt> <var>device</var>
-<dd>
-[in device send right]
-A device port to the device to be written.
-<p>
-<dt> <var>reply_port</var>
-<dd>
-[in reply receive (to be converted to send-once) right]
-The port to
-which the reply message is to be sent.
-<p>
-<dt> <var>mode</var>
-<dd>
-[in scalar]
-I/O mode value. Meaningful options are:
-<dl>
-<p>
-<dt> <strong>D_NOWAIT</strong>
-<dd>
-Do not wait for I/O completion.
-</dl>
-<p>
-<dt> <var>recnum</var>
-<dd>
-[in scalar]
-Record number to be written.
-<p>
-<dt> <var>data</var>
-<dd>
-[pointer to in array of bytes]
-Data bytes to be written.
-<p>
-<dt> <var>data_count</var>
-<dd>
-[in scalar]
-Number of data bytes to be written.
-<p>
-<dt> <var>return_code</var>
-<dd>
-[in scalar]
-The return status code from the write.
-<p>
-<dt> <var>bytes_written</var>
-<dd>
-[out scalar, in for asynchronous form]
-Size of data transfer.
-</dl>
-<h3>DESCRIPTION</h3>
-<p>
-The <strong>device_write</strong> function writes a sequence of bytes
-to a device object. The
-meaning of <var>recnum</var> as well as the specific operation performed is device
-dependent.
-<h3>RETURN VALUES</h3>
-<p>
-Only generic errors apply.
-<h3>RELATED INFORMATION</h3>
-<p>
-Functions:
-<a href="device_write_inband.html"><strong>device_write_inband</strong></a>,
-<a href="device_reply_server.html"><strong>device_reply_server</strong></a>.