1<h2>i386_set_ldt</h2> 2<hr> 3<p> 4<strong>Function</strong> - Set per-thread segment descriptors. 5<h3>SYNOPSIS</h3> 6<pre> 7<strong>kern_return_t i386_set_ldt</strong> 8 <strong>(thread_act_t</strong> <var>target_act</var>, 9 <strong>int</strong> <var>first_selector</var>, 10 <strong>descriptor_list_t</strong> <var>desc_list</var><strong>);</strong> 11</pre> 12<h3>PARAMETERS</h3> 13<dl> 14<p> 15<dt> <var>target_act</var> 16<dd> 17[in thread send right] 18Thread whose segment descriptors are to be set. 19<p> 20<dt> <var>first_selector</var> 21<dd> 22[in scalar] 23Selector value (segment register value) corresponding to the 24first segment whose descriptor is to be set. 25<p> 26<dt> <var>desc_list</var> 27<dd> 28[pointer to in array of <strong>descriptor_t</strong>] 29Array of segment descriptors. The 30following forms are permitted: 31<ul> 32<p> 33<li> 34Empty descriptor. The <strong>ACC_P</strong> flag (segment present) may or may 35not be set. 36<p> 37<li> 38<strong>ACC_CALL_GATE</strong>--Converted into a system call gate. The 39<strong>ACC_P</strong> flag must be set. 40</ul> 41<p> 42All other descriptors must have both the <strong>ACC_P</strong> flag set and specify 43user mode access (<strong>ACC_PL_U</strong>). 44<ul> 45<p> 46<li> 47<strong>ACC_DATA</strong>. 48<p> 49<li> 50<strong>ACC_DATA_W</strong>. 51<p> 52<li> 53<strong>ACC_DATA_E</strong>. 54<p> 55<li> 56<strong>ACC_DATA_EW</strong>. 57<p> 58<li> 59<strong>ACC_CODE</strong>. 60<p> 61<li> 62<strong>ACC_CODE_R</strong>. 63<p> 64<li> 65<strong>ACC_CODE_C</strong>. 66<p> 67<li> 68<strong>ACC_CODE_CR</strong>. 69<p> 70<li> 71<strong>ACC_CALL_GATE_16</strong>. 72<p> 73<li> 74<strong>ACC_CALL_GATE</strong>. 75</ul> 76</dl> 77<h3>DESCRIPTION</h3> 78<p> 79The <strong>i386_set_ldt</strong> function allows a thread to have a 80private local descriptor 81table (LDT) which allows its local segments to map various ranges 82of its address 83space. 84<h3>RETURN VALUES</h3> 85<p> 86Only generic errors apply. 87<h3>RELATED INFORMATION</h3> 88<p> 89Functions: 90<a href="i386_get_ldt.html"><strong>i386_get_ldt<strong></a>. 91