task_get_special_port

Function - Return a send write to the indicated special port.

SYNOPSIS

kern_return_t   task_get_special_port
                (task_t                                    task,
                 int                                 which_port,
                 task                              special_port);


Macro Forms:


kern_return_t   task_get_bootstrap_port
                (task_t                                    task,
                 task                              special_port);


kern_return_t   task_get_kernel_port
                (task_t                                    task,
                 task                              special_port);


kern_return_t   task_get_host_name_port
                (task_t                                    task,
                 task                              special_port);

PARAMETERS

task

[in task send right] The port for the task for which to return the port's send right.

which_port

[in scalar] The special port for which the send right is requested. Valid values are:

TASK_KERNEL_PORT

[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 mach_task_self (immovable).

TASK_BOOTSTRAP_PORT

[bootstrap send right] The task's bootstrap port. Used to send messages requesting return of other system service ports.

TASK_HOST_NAME_PORT

[host-self send right] The port used to request information of the containing host. This is the port returned by mach_host_self.

TASK_WIRED_LEDGER_PORT

[ledger send right] The port naming the source from which this task draws its wired kernel memory.

TASK_PAGED_LEDGER_PORT

[ledger send right] The port naming the source from which this task draws its default memory managed memory.

special_port

[out task-special send right] The returned value for the port.

DESCRIPTION

The task_get_special_port function returns a send right for a special port belonging to task.

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 mach_msg function, however, any task can pass a send right for its kernel port to another task.

NOTES

The current implementation does not support the TASK_HOST_NAME_PORT features associated with this interface.

RETURN VALUES

Only generic errors apply.

RELATED INFORMATION

Functions: mach_task_self, task_create, task_set_special_port, thread_get_special_port, thread_set_special_port, mach_host_self.