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This manual page is derived from the DAT/uDAPL 1.2 specification.
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dat_ep_disconnect - terminate a connection or a connection establishment

cc [ flag.\|.\|. ] file.\|.\|. -ldat [ library.\|.\|. ]
#include <dat/udat.h>

DAT_RETURN
 dat_ep_disconnect (
 IN DAT_EP_HANDLE ep_handle,
 IN DAT_CLOSE_FLAGS disconnect_flags
 )

ep_handle disconnect_flags

The dat_ep_disconnect() function requests a termination of a connection or connection establishment. This operation is used by the active/client or a passive/server side Consumer of the connection model.

The disconnect_flags parameter allows Consumers to specify whether they want graceful or abrupt disconnect. Upon disconnect, all outstanding and in-progress DTOs and RMR Binds must be completed.

For abrupt disconnect, all outstanding DTOs and RMR Binds are completed unsuccessfully, and in-progress DTOs and RMR Binds can be completed successfully or unsuccessfully. If an in-progress DTO is completed unsuccessfully, all follow on in-progress DTOs in the same direction also must be completed unsuccessfully. This order is presented to the Consumer through a DTO completion Event Stream of the recv_evd_handle and request_evd_handle of the Endpoint.

For graceful disconnect, all outstanding and in-progress request DTOs and RMR Binds must try to be completed successfully first, before disconnect proceeds. During that time, the local Endpoint is in a DAT_EP_DISCONNECT_PENDING state.

The Consumer can call abrupt dat_ep_disconnect() when the local Endpoint is in the DAT_EP_DISCONNECT_PENDING state. This causes the Endpoint to transition into DAT_EP_STATE_DISCONNECTED without waiting for outstanding and in-progress request DTOs and RMR Binds to successfully complete. The graceful dat_ep_disconnect() call when the local Endpoint is in the DAT_EP_DISCONNECT_PENDING state has no effect.

If the Endpoint is not in DAT_EP_STATE_CONNECTED, the semantic of the operation is the same for graceful or abrupt disconnect_flags value.

No new Send, RDMA Read, and RDMA Write DTOs, or RMR Binds can be posted to the Endpoint when the local Endpoint is in the DAT_EP_DISCONNECT_PENDING state.

The successful completion of the disconnect is reported to the Consumer through a DAT_CONNECTION_EVENT_DISCONNECTED event on connect_evd_handle of the Endpoint. The Endpoint is automatically transitioned into a DAT_EP_STATE_DISCONNECTED state upon successful asynchronous completion. If the same EVD is used for connect_evd_handle and any recv_evd_handle and request_evd_handle, all successful Completion events of in-progress DTOs precede the Disconnect Completion event.

Disconnecting an unconnected Disconnected Endpoint is no-op. Disconnecting an Endpoint in DAT_EP_STATE_UNCONNECTED, DAT_EP_STATE_RESERVED, DAT_EP_STATE_PASSIVE_CONNECTION_PENDING, and DAT_EP_STATE_TENTATIVE_CONNECTION_PENDING is disallowed.

Both abrupt and graceful disconnect of the Endpoint during connection establishment, DAT_EP_STATE_ACTIVE_CONNECTION_PENDING and DAT_EP_STATE_COMPLETION_PENDING, "aborts" the connection establishment and transitions the local Endpoint into DAT_EP_STATE_DISCONNECTED. That causes preposted Recv DTOs to be flushed to recv_evd_handle.

DAT_SUCCESS DAT_INVALID_HANDLE DAT_INSUFFICIENT_RESOURCES DAT_INVALID_PARAMETER DAT_INVALID_STATE

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPE ATTRIBUTE VALUE

Interface Stability Standard: uDAPL, 1.1, 1.2

MT-Level Unsafe

libdat(3LIB), attributes(5)