osfmk/man/mach_port_allocate.html

   1 <h2>mach_port_allocate</h2>
   2 <hr>
   3 <p>
   4 <strong>Function</strong> - Create caller-specified type of port right.
   5 <h3>SYNOPSIS</h3>
   6 <pre>
   7 <strong>kern_return_t   mach_port_allocate</strong>
   8                 <strong>(ipc_space_t</strong>                               <var>task</var>,
   9                  <strong>mach_port_right_t</strong>                        <var>right</var>,
  10                  <strong>mach_port_name_t</strong>                         <var>*name</var><strong>);</strong>
  11 </pre>
  12 <h3>PARAMETERS</h3>
  13 <dl>
  14 <p>
  15 <dt> <var>task</var>
  16 <dd>
  17 [in task send right]
  18 The task acquiring the port right.
  19 <p>
  20 <dt> <var>right</var>
  21 <dd>
  22 [in scalar]
  23 The kind of entity to be created.  This is one of the following:
  24 <dl>
  25 <p>
  26 <dt> <strong>MACH_PORT_RIGHT_RECEIVE</strong>
  27 <dd>
  28 <strong>mach_port_allocate</strong> creates a port.  The new port is not a
  29 member of any port set.  It doesn't have any extant send or
  30 send-once rights.  Its make-send count is zero, its sequence
  31 number is zero, its queue limit is <strong>MACH_PORT_QLIMIT_DEFAULT</strong>, and
  32 it has no queued messages.  <var>name</var> denotes the
  33 receive right for the new port.
  34 <var>task</var> does not hold send rights for the new port, only the
  35 receive right.  <strong>mach_port_insert_right</strong> and
  36 <strong>mach_port_extract_right</strong> can be used to convert the receive right into a
  37 combined send/receive right.
  38 <p>
  39 <dt> <strong>MACH_PORT_RIGHT_PORT_SET</strong>
  40 <dd>
  41 <strong>mach_port_allocate</strong> creates a port set.  The new port set has
  42 no members.
  43 <p>
  44 <dt> <strong>MACH_PORT_RIGHT_DEAD_NAME</strong>
  45 <dd>
  46 <strong>mach_port_allocate</strong> creates a dead name.  The new dead
  47 name has one user reference.
  48 </dl>
  49 <p>
  50 <dt> <var>name</var>
  51 <dd>
  52 [out scalar]
  53 The task's name for the port right.  This can be any name
  54 that wasn't in use.
  55 </dl>
  56 <h3>DESCRIPTION</h3>
  57 <p>
  58 The <strong>mach_port_allocate</strong> function creates a new right
  59 in the specified task.  The new right's name is returned in name.
  60 <p>
  61 Ports that are allocated via this call do not support the full set of
  62 Mach port semantics; in particular, the kernel will not provide no-more-senders
  63 notification service requests on such ports.  Any attempt to request  no-more-senders
  64 notification service
  65 will generate an error.  Use the <strong>mach_port_allocate_full</strong>
  66 interface to allocate ports that support the full set of Mach port semantics.
  67 <h3>NOTES</h3>
  68 <p>
  69 This interface is machine word length specific because of the port name
  70 parameter.
  71 <h3>RETURN VALUES</h3>
  72 <dl>
  73 <p>
  74 <dt> <strong>KERN_NO_SPACE</strong>
  75 <dd>
  76 There was no room in task's IPC name space for another right.
  77 </dl>
  78 <h3>RELATED INFORMATION</h3>
  79 <p>
  80 Functions:
  81 <a href="mach_port_allocate_name.html"><strong>mach_port_allocate_name</strong></a>,
  82 <a href="mach_port_deallocate.html"><strong>mach_port_deallocate</strong></a>,
  83 <a href="mach_port_insert_right.html"><strong>mach_port_insert_right</strong></a>,
  84 <a href="mach_port_extract_right.html"><strong>mach_port_extract_right</strong></a>.