1*5e3eaea3SApple OSS Distributions<h2>device_write_async</h2> 2*5e3eaea3SApple OSS Distributions<hr> 3*5e3eaea3SApple OSS Distributions<p> 4*5e3eaea3SApple OSS Distributions<strong>System Trap</strong> - Write a sequence of bytes to a device object. 5*5e3eaea3SApple OSS Distributions<h3>SYNOPSIS</h3> 6*5e3eaea3SApple OSS Distributions<pre> 7*5e3eaea3SApple OSS Distributions<strong>kern_return_t device_write_async</strong> 8*5e3eaea3SApple OSS Distributions <strong>(mach_port_t</strong> <var>device</var>, 9*5e3eaea3SApple OSS Distributions <strong>mach_port_t</strong> <var>queue</var>, 10*5e3eaea3SApple OSS Distributions <strong>mach_port_t</strong> <var>request_id</var>, 11*5e3eaea3SApple OSS Distributions <strong>dev_mode_t</strong> <var>mode</var>, 12*5e3eaea3SApple OSS Distributions <strong>recnum_t</strong> <var>recnum</var>, 13*5e3eaea3SApple OSS Distributions <strong>io_buf_ptr_t</strong> <var>data</var>, 14*5e3eaea3SApple OSS Distributions <strong>io_buf_len_t</strong> <var>bytes_wanted</var><strong>);</strong> 15*5e3eaea3SApple OSS Distributions</pre> 16*5e3eaea3SApple OSS Distributions<h3>PARAMETERS</h3> 17*5e3eaea3SApple OSS Distributions<dl> 18*5e3eaea3SApple OSS Distributions<p> 19*5e3eaea3SApple OSS Distributions<dt> <var>device</var> 20*5e3eaea3SApple OSS Distributions<dd> 21*5e3eaea3SApple OSS Distributions[in device send right] A device port to the device to be read. 22*5e3eaea3SApple OSS Distributions<p> 23*5e3eaea3SApple OSS Distributions<dt> <var>queue</var> 24*5e3eaea3SApple OSS Distributions<dd> 25*5e3eaea3SApple OSS Distributions[in io_done queue send right] The port returned from 26*5e3eaea3SApple OSS Distributionsio_done_queue_create. 27*5e3eaea3SApple OSS Distributions<p> 28*5e3eaea3SApple OSS Distributions<dt> <var>request_id</var> 29*5e3eaea3SApple OSS Distributions<dd> 30*5e3eaea3SApple OSS Distributions[in send right] An unique request identifier that will be passed back as 31*5e3eaea3SApple OSS Distributionspart of the io_done_result structure. 32*5e3eaea3SApple OSS Distributions<p> 33*5e3eaea3SApple OSS Distributions<dt> <var>mode</var> 34*5e3eaea3SApple OSS Distributions<dd> 35*5e3eaea3SApple OSS Distributions[in scalar] I/O mode value. Meaningful options are: 36*5e3eaea3SApple OSS Distributions<p> 37*5e3eaea3SApple OSS Distributions <dl> 38*5e3eaea3SApple OSS Distributions<dt> <strong>D_NOWAIT</strong> 39*5e3eaea3SApple OSS Distributions<dd> 40*5e3eaea3SApple OSS DistributionsDo not wait if data is unavailable. 41*5e3eaea3SApple OSS Distributions </dl> 42*5e3eaea3SApple OSS Distributions<p> 43*5e3eaea3SApple OSS Distributions<dt> <var>recnum</var> 44*5e3eaea3SApple OSS Distributions<dd> 45*5e3eaea3SApple OSS Distributions[in scalar] Record number to be read. 46*5e3eaea3SApple OSS Distributions<p> 47*5e3eaea3SApple OSS Distributions<dt> <var>data</var> 48*5e3eaea3SApple OSS Distributions<dd> 49*5e3eaea3SApple OSS Distributions[pointer to in array of bytes] Data bytes to be written. 50*5e3eaea3SApple OSS Distributions<p> 51*5e3eaea3SApple OSS Distributions<dt> <var>bytes_wanted</var> 52*5e3eaea3SApple OSS Distributions<dd> 53*5e3eaea3SApple OSS Distributions[in scalar] Size of data transfer. 54*5e3eaea3SApple OSS Distributions</dl> 55*5e3eaea3SApple OSS Distributions<h3>DESCRIPTION</h3> 56*5e3eaea3SApple OSS Distributions<p> 57*5e3eaea3SApple OSS DistributionsThe <strong>device_write_async</strong> function enqueues a write operation for a 58*5e3eaea3SApple OSS Distributionssequence of bytes to a device object. The meaning of recnum as well as 59*5e3eaea3SApple OSS Distributionsthe specific operation performed is device dependent. 60*5e3eaea3SApple OSS Distributions<h3>RETURN VALUES</h3> 61*5e3eaea3SApple OSS Distributions<p> 62*5e3eaea3SApple OSS Distributions<strong>device_write_async</strong> returns only invalid parameter errors. 63*5e3eaea3SApple OSS Distributions<h3>RELATED INFORMATION</h3> 64*5e3eaea3SApple OSS Distributions<p> 65*5e3eaea3SApple OSS DistributionsFunctions: 66*5e3eaea3SApple OSS Distributions<a href="device_read_async_inband.html"><strong>device_read_async_inband</strong></a>, 67*5e3eaea3SApple OSS Distributions<a href="DR_overwrite_async.html"><strong>device_read_overwrite_async</strong></a>, 68*5e3eaea3SApple OSS Distributions<a href="device_write_async_inband.html"><strong>device_write_async_inband</strong></a>, 69*5e3eaea3SApple OSS Distributions<a href="io_done_queue_create.html"><strong>io_done_queue_create</strong></a>. 70