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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:
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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 */
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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:
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DOOR_LOCAL
- The door descriptor refers to a service procedure in this process.
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DOOR_UNREF
- The door has requested notification when all but the last reference has gone away.
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DOOR_UNREF_MULTI
- Similar to DOOR_UNREF, except multiple unreferenced notifications may be delivered for this door.
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DOOR_IS_UNREF
- There is currently only one descriptor referring to the door.
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DOOR_REVOKED
- The door descriptor refers to a door that has been revoked.
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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.
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