osfmk/man/task_set_emulation_vector.html

   1 <h2>task_set_emulation_vector</h2>
   2 <hr>
   3 <p>
   4 <strong>Function</strong> - Establish the target task's user-level system call handlers.
   5 <h3>SYNOPSIS</h3>
   6 <pre>
   7 <strong>kern_return_t   task_set_emulation_vector</strong>
   8                 <strong>(task_t</strong>                                    <var>task</var>,
   9                  <strong>int</strong>                               <var>vector_start</var>,
  10                  <strong>emulation_vector_t</strong>            <var>emulation_vector</var>,
  11                  <strong>mach_msg_type_number_t</strong>  <var>emulation_vector_count</var><strong>);</strong>
  12 </pre>
  13 <h3>PARAMETERS</h3>
  14 <dl>
  15 <p>
  16 <dt> <var>task</var>
  17 <dd>
  18 [in task send right]
  19 The port for the task for which to establish the
  20 system call handler.
  21 <p>
  22 <dt> <var>vector_start</var>
  23 <dd>
  24 [in scalar]
  25 The syscall number corresponding to the first element of
  26 <var>emulation_vector</var>.
  27 <p>
  28 <dt> <var>emulation_vector</var>
  29 <dd>
  30 [pointer to in array of <strong>vm_address_t</strong>]
  31 An array of routine entrypoints
  32 for the system calls starting with syscall number <var>vector_start</var>.
  33 <p>
  34 <dt> <var>emulation_vector_count</var>
  35 <dd>
  36 [in scalar]
  37 The number of elements in <var>emulation_vector</var>.
  38 </dl>
  39 <h3>DESCRIPTION</h3>
  40 <p>
  41 The <strong>task_set_emulation_vector</strong> function establishes
  42 a handler within the task
  43 for a set of system calls.  When a thread executes a system call
  44 with one of these
  45 numbers, the system call will be redirected to the corresponding
  46 routine within
  47 the task's address space.
  48 <p>
  49 These emulation handler addresses are inherited by child processes.
  50 <h3>NOTES</h3>
  51 <p>
  52 This interface is machine word length specific because of the
  53 virtual addresses
  54 in the <var>emulation_vector</var> parameter.
  55 <h3>RETURN VALUES</h3>
  56 <p>
  57 Only generic errors apply.
  58 <h3>RELATED INFORMATION</h3>
  59 <p>
  60 Functions:
  61 <a href="task_get_emulation_vector.html"><strong>task_get_emulation_vector</strong></a>.