1<h2>exc_server</h2> 2<hr> 3<p> 4<strong>Function</strong> - Handle kernel-reported thread exception. 5<h3>SYNOPSIS</h3> 6<pre> 7<strong>boolean_t exc_server</strong> 8 <strong>(mach_msg_header_t</strong> <var>request_msg</var>, 9 <strong>mach_msg_header_t</strong> <var>reply_ms</var><strong>);</strong> 10</pre> 11<h3>PARAMETERS</h3> 12<dl> 13<p> 14<dt> <var>in_msg</var> 15<dd> 16[pointer to in structure] 17The exception message received from the 18kernel. 19<p> 20<dt> <var>out_msg</var> 21<dd> 22[out structure] 23A reply message. 24</dl> 25<h3>DESCRIPTION</h3> 26<p> 27The <strong>exc_server</strong> function is the MIG generated server 28handling function to 29handle messages from the kernel relating to the occurrence of 30an exception in a 31thread. Such messages are delivered to the exception port set via 32<strong>thread_set_exception_ports</strong> or <strong>task_set_exception_ports</strong>. 33When an exception occurs in a 34thread, the thread sends an exception message to its exception port, blocking in 35the kernel waiting for the receipt of a reply. The <strong>exc_server</strong> 36function performs 37all necessary argument handling for this kernel message and calls 38<strong>catch_exception_raise</strong>, <strong>catch_exception_raise_state</strong> or 39<strong>catch_exception_raise_state_identity</strong>, which should handle the 40exception. If the called routine 41returns <strong>KERN_SUCCESS</strong>, a reply message will be sent, allowing 42the thread to 43continue from the point of the exception; otherwise, no reply message is sent 44and the called routine must have dealt with the exception thread directly. 45<h3>RETURN VALUES</h3> 46<dl> 47<p> 48<dt> <strong>TRUE</strong> 49<dd> 50The message was handled and the appropriate function was called. 51<p> 52<dt> <strong>FALSE</strong> 53<dd> 54The message did not apply to the exception mechanism and no other 55action was taken. 56</dl> 57<h3>RELATED INFORMATION</h3> 58<p> 59Functions: 60<a href="catch_exception_raise.html"><strong>catch_exception_raise<strong></a>. 61