1<h2>device_write</h2> 2<hr> 3<p> 4<strong>Function</strong> - Write a sequence of bytes to a specific device. 5<h3>SYNOPSIS</h3> 6<pre> 7<strong>#include<device/device.h></strong> 8 9<strong>kern_return_t device_write</strong> 10 <strong>(device_t</strong> <var>device</var>, 11 <strong>mach_port_t</strong> <var>reply_port</var>, 12 <strong>dev_mode_t</strong> <var>mode</var>, 13 <strong>recnum_t</strong> <var>recnum</var>, 14 <strong>io_buf_ptr_t</strong> <var>data</var>, 15 <strong>mach_msg_type_number_t</strong> <var>data_count</var>, 16 <strong>io_buf_len_t</strong> <var>io_buf_len_t</var><strong>);</strong> 17 18 19<strong>#include<device/device_request.h></strong> 20 21<strong>kern_return_t device_write_request</strong> 22 <strong>(mach_port_t</strong> <var>device</var>, 23 <strong>mach_port_t</strong> <var>reply_port</var>, 24 <strong>dev_mode_t</strong> <var>mode</var>, 25 <strong>recnum_t</strong> <var>recnum</var>, 26 <strong>io_buf_ptr_t</strong> <var>data</var>, 27 <strong>mach_msg_type_number_t</strong> <var>data_count</var><strong>);</strong> 28 29 30<strong>kern_return_t ds_device_write_reply</strong> 31 <strong>(mach_port_t</strong> <var>reply_port</var>, 32 <strong>kern_return_t</strong> <var>return_code</var>, 33 <strong>io_buf_len_t</strong> <var>bytes_written</var><strong>);</strong> 34</pre> 35<h3>PARAMETERS</h3> 36<dl> 37<p> 38<dt> <var>device</var> 39<dd> 40[in device send right] 41A device port to the device to be written. 42<p> 43<dt> <var>reply_port</var> 44<dd> 45[in reply receive (to be converted to send-once) right] 46The port to 47which the reply message is to be sent. 48<p> 49<dt> <var>mode</var> 50<dd> 51[in scalar] 52I/O mode value. Meaningful options are: 53<dl> 54<p> 55<dt> <strong>D_NOWAIT</strong> 56<dd> 57Do not wait for I/O completion. 58</dl> 59<p> 60<dt> <var>recnum</var> 61<dd> 62[in scalar] 63Record number to be written. 64<p> 65<dt> <var>data</var> 66<dd> 67[pointer to in array of bytes] 68Data bytes to be written. 69<p> 70<dt> <var>data_count</var> 71<dd> 72[in scalar] 73Number of data bytes to be written. 74<p> 75<dt> <var>return_code</var> 76<dd> 77[in scalar] 78The return status code from the write. 79<p> 80<dt> <var>bytes_written</var> 81<dd> 82[out scalar, in for asynchronous form] 83Size of data transfer. 84</dl> 85<h3>DESCRIPTION</h3> 86<p> 87The <strong>device_write</strong> function writes a sequence of bytes 88to a device object. The 89meaning of <var>recnum</var> as well as the specific operation performed is device 90dependent. 91<h3>RETURN VALUES</h3> 92<p> 93Only generic errors apply. 94<h3>RELATED INFORMATION</h3> 95<p> 96Functions: 97<a href="device_write_inband.html"><strong>device_write_inband</strong></a>, 98<a href="device_reply_server.html"><strong>device_reply_server</strong></a>. 99