xref: /xnu-8019.80.24/osfmk/man/task_get_special_port.html (revision a325d9c4a84054e40bbe985afedcb50ab80993ea)

<h2>task_get_special_port</h2>
<hr>
<p>
<strong>Function</strong> - Return a send write to the indicated special port.
<h3>SYNOPSIS</h3>
<pre>
<strong>kern_return_t   task_get_special_port</strong>
                <strong>(task_t</strong>                                    <var>task</var>,
                 <strong>int</strong>                                 <var>which_port</var>,
                 <strong>task</strong>                              <var>special_port</var><strong>);</strong>


<strong>Macro Forms:</strong>


<strong>kern_return_t   task_get_bootstrap_port</strong>
                <strong>(task_t</strong>                                    <var>task</var>,
                 <strong>task</strong>                              <var>special_port</var><strong>);</strong>


<strong>kern_return_t   task_get_kernel_port</strong>
                <strong>(task_t</strong>                                    <var>task</var>,
                 <strong>task</strong>                              <var>special_port</var><strong>);</strong>


<strong>kern_return_t   task_get_host_name_port</strong>
                <strong>(task_t</strong>                                    <var>task</var>,
                 <strong>task</strong>                              <var>special_port</var><strong>);</strong>
</pre>
<h3>PARAMETERS</h3>
<dl>
<p>
<dt> <var>task</var>
<dd>
[in task send right]
The port for the task for which to return the port's
send right.
<p>
<dt> <var>which_port</var>
<dd>
[in scalar]
The special port for which the send right is requested.  Valid
values are:
<dl>
<p>
<dt> <strong>TASK_KERNEL_PORT</strong>
<dd>
[task-self send right] The port used to control this task.  Used
to send messages that affect the task.  This is the movable task port and
different from the one returned by <strong>mach_task_self</strong> (immovable).
<p>
<dt> <strong>TASK_BOOTSTRAP_PORT</strong>
<dd>
[bootstrap send right] The task's bootstrap port.  Used to send
messages requesting return of other system service ports.
<p>
<dt> <strong>TASK_HOST_NAME_PORT</strong>
<dd>
[host-self send right] The port used to request information of
the containing host.  This is the port returned by
<strong>mach_host_self</strong>.
<p>
<dt> <strong>TASK_WIRED_LEDGER_PORT</strong>
<dd>
[ledger send right] The port naming the source from which
this task draws its wired kernel memory.
<p>
<dt> <strong>TASK_PAGED_LEDGER_PORT</strong>
<dd>
[ledger send right] The port naming the source from which
this task draws its default memory managed memory.
</dl>
<p>
<dt> <var>special_port</var>
<dd>
[out task-special send right]
The returned value for the port.
</dl>
<h3>DESCRIPTION</h3>
<p>
The <strong>task_get_special_port</strong> function returns a send right
for a special port belonging to <var>task</var>.
<p>
If one task has a send right for the kernel port of another task, it can use
the port to perform kernel operations for the other task.  Send rights for a
kernel port normally are held only by the task to which the port belongs,
or by the task's parent task.  Using the <strong>mach_msg</strong> function, however,
any task can pass a send right for its kernel port to another task.
<h3>NOTES</h3>
<p>
The current implementation does not support the <strong>TASK_HOST_NAME_PORT</strong>
features associated with this interface.
<h3>RETURN VALUES</h3>
<p>
Only generic errors apply.
<h3>RELATED INFORMATION</h3>
<p>
Functions:
<a href="mach_task_self.html"><strong>mach_task_self</strong></a>,
<a href="task_create.html"><strong>task_create</strong></a>,
<a href="task_set_special_port.html"><strong>task_set_special_port</strong></a>,
<a href="thread_get_special_port.html"><strong>thread_get_special_port</strong></a>,
<a href="thread_set_special_port.html"><strong>thread_set_special_port</strong></a>,
<a href="mach_host_self.html"><strong>mach_host_self</strong></a>.