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Related Modules:
Description:
Defines the driver service.
When a driver releases services to user-level applications, the service interface must inherit this structure and implements the Dispatch function in the structure.
Since:
1.0
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struct HdfObject |
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Open )(struct HdfDeviceIoClient *client) |
Called when the driver service is enabled by a user-level application. |
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Dispatch )(struct HdfDeviceIoClient *client, int cmdId, struct HdfSBuf *data, struct HdfSBuf *reply) |
Called when the driver service is invoked by a user-level application. |
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Release )(struct HdfDeviceIoClient *client) |
Called when the driver service is released by a user-level application. |
int32_t(* IDeviceIoService::Dispatch) (struct [HdfDeviceIoClient](HdfDeviceIoClient.md) *client, int cmdId, struct [HdfSBuf](HdfSBuf.md) *data, struct [HdfSBuf](HdfSBuf.md) *reply)
Description:
Called when the driver service is invoked by a user-level application.
Parameters:
| client | Indicates the pointer to the client object of the service. |
| cmdId | Indicates the command word of the service interface. |
| data | Indicates the pointer to the data passed by the invoker. |
| reply | Indicates the pointer to the data that needs to be returned to the invoker. |
Returns:
Returns 0 if the operation is successful; returns a negative value otherwise.
struct [HdfObject](HdfObject.md) IDeviceIoService::object
Description:
Driver service object ID
int32_t(* IDeviceIoService::Open) (struct [HdfDeviceIoClient](HdfDeviceIoClient.md) *client)
Description:
Called when the driver service is enabled by a user-level application.
Parameters:
| client | Indicates the pointer to the client object of the service. |
Returns:
Returns 0 if the operation is successful; returns a negative value otherwise.
void(* IDeviceIoService::Release) (struct [HdfDeviceIoClient](HdfDeviceIoClient.md) *client)
Description:
Called when the driver service is released by a user-level application.
Parameters:
| client | Indicates the pointer to the client object of the service. |
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