<h2>device_write_async_inband</h2>

<strong>System Trap</strong> - Write a sequence of bytes "inband" to a device object.

<h3>SYNOPSIS</h3>

<strong>kern_return_t device_write_async_inband</strong>

<strong>(mach_port_t</strong> <var>device</var>,

<strong>mach_port_t</strong> <var>queue</var>,

<strong>mach_port_t</strong> <var>request_id</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>io_buf_len_t</strong> <var>bytes_wanted</var><strong>);</strong>

<h3>PARAMETERS</h3>

<dt> <var>device</var>

[in device send right] A device port to the device to be read.

<dt> <var>queue</var>

[in io_done queue send right] The port returned from

io_done_queue_create.

<dt> <var>request_id</var>

[in send right] An unique request identifier that will be passed back as

part of the io_done_result structure.

<dt> <var>mode</var>

[in scalar] I/O mode value. Meaningful options are:

<dl>

<dt> <strong>D_NOWAIT</strong>

Do not wait if data is unavailable.

</dl>

<dt> <var>recnum</var>

[in scalar] Record number to be read.

<dt> <var>data</var>

[pointer to in array of bytes] Data bytes to be written.

<dt> <var>bytes_wanted</var>

[in scalar] Size of data transfer.

<h3>DESCRIPTION</h3>

The <strong>device_write_async_inband</strong> function enqueues a write operation for

a sequence of bytes to a device object. The meaning of recnum as

well as the specific operation performed is device dependent. This

call differs from <strong>device_write_async</strong> in that the bytes to be written

are sent "inband" in the request IPC message.

<h3>RETURN VALUES</h3>

<strong>device_write_async_inband</strong> returns only invalid parameter errors.

<h3>RELATED INFORMATION</h3>

Functions:

<a href="device_read_async_inband.html"><strong>device_read_async_inband</strong></a>,

<a href="DR_overwrite_async.html"><strong>device_read_overwrite_async</strong></a>,

<a href="device_write_async.html"><strong>device_write_async</strong></a>,

<a href="io_done_queue_create.html"><strong>io_done_queue_create</strong></a>.