DOOR_INFO(3C) Standard C Library Functions DOOR_INFO(3C)

NAME

door_info - return information associated with a door descriptor

SYNOPSIS

cc -mt [ flag... ] file... [ library... ]
#include <door.h>

int door_info(int d, struct door_info *info);

DESCRIPTION

The door_info() function returns information associated with a door
descriptor. It obtains information about the door descriptor d and places
the information that is relevant to the door in the structure pointed to
by the info argument.


The door_info structure pointed to by the info argument contains the
following members:

pid_t di_target; /* door server pid */
door_ptr_t di_proc; /* server function */
door_ptr_t di_data; /* data cookie for invocation */
door_attr_t di_attributes; /* door attributes */
door_id_t di_uniquifier; /* unique id among all doors */


The di_target member is the process ID of the door server, or -1 if the
door server process has exited.


The values for di_attributes may be composed of the following:

DOOR_LOCAL
The door descriptor refers to a service procedure in
this process.


DOOR_UNREF
The door has requested notification when all but the
last reference has gone away.


DOOR_UNREF_MULTI
Similar to DOOR_UNREF, except multiple unreferenced
notifications may be delivered for this door.


DOOR_IS_UNREF
There is currently only one descriptor referring to
the door.


DOOR_REFUSE_DESC
The door refuses any attempt to door_call(3C) it with
argument descriptors.


DOOR_NO_CANCEL
Clients who abort a door_call(3C) call on this door
will not cause the cancellation(7) of the server
thread handling the request.


DOOR_REVOKED
The door descriptor refers to a door that has been
revoked.


DOOR_PRIVATE
The door has a separate pool of server threads
associated with it.


The di_proc and di_data members are returned as door_ptr_t objects rather
than void * pointers to allow clients and servers to interoperate in
environments where the pointer sizes may vary in size (for example,
32-bit clients and 64-bit servers). Each door has a system-wide unique
number associated with it that is set when the door is created by
door_create(). This number is returned in di_uniquifier.

RETURN VALUES

Upon successful completion, 0 is returned. Otherwise, -1 is returned and
errno is set to indicate the error.

ERRORS

The door_info() function will fail if:

EFAULT
The address of argument info is an invalid address.


EBADF
d is not a door descriptor.

ATTRIBUTES

See attributes(7) for descriptions of the following attributes:


+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Architecture | all |
+--------------------+-----------------+
|Interface Stability | Stable |
+--------------------+-----------------+
|MT-Level | Safe |
+--------------------+-----------------+

SEE ALSO

door_bind(3C), door_call(3C), door_create(3C), door_server_create(3C),
attributes(7), cancellation(7)

March 22, 2005 DOOR_INFO(3C)