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globus_gass_transfer_data

Sending and Receiving Data


typedef void(* globus_gass_transfer_bytes_callback_t) (void *arg, globus_gass_transfer_request_t request, globus_byte_t *bytes, globus_size_t length, globus_bool_t last_data)


int globus_gass_transfer_send_bytes (globus_gass_transfer_request_t request, globus_byte_t *bytes, globus_size_t send_length, globus_bool_t last_data, globus_gass_transfer_bytes_callback_t callback, void *user_arg)
int globus_gass_transfer_receive_bytes (globus_gass_transfer_request_t request, globus_byte_t *bytes, globus_size_t max_length, globus_size_t wait_for_length, globus_gass_transfer_bytes_callback_t callback, void *user_arg)

Sending and Receiving Data.

Byte send or receive callback function.

Parameters

arg The user_arg passed to the function which registered this callback. The user may use this value for any purpose.
request The request handle associated with this byte array.
bytes The byte array which was sent or received.
length The length of data which was sent or received.
last_data Boolean flag whether this is the final byte array for this request.

See also

globus_gass_transfer_send_bytes(), globus_gass_transfer_receive_bytes()

Receive a byte array associated with a request handle.

This function receives a block of data from a server or client as part of the processing for a request. Multiple data blocks may be registered with the GASS transfer library at once.

When processing a server request, this function may only be used in conjunction with 'put' or 'append' requests. The user must call globus_gass_transfer_authorize() before calling this function.

When processing a client request, this function may only be used in conjunction with 'get' requests. This function may not be called before either the callback function has been invoked, or the blocking globus_gass_tranfser_put() or globus_gass_transfer_append() function has returned.

Parameters

request The request handle with which this block of bytes is associated.
bytes A user-supplied buffer containing the data associated with the request.
max_length The length of the bytes array.
wait_for_length The minimum amount of data to wait for before invoking the callback function. A partial byte array of at least this amount will be returned in the callback, unless end-of-file is reached before this amount.
callback Function to call once the bytes array has been received.
user_arg Argument to be passed to the callback function.

Return values

GLOBUS_SUCCESS The bytes array was successfully registered with the GASS transfer library. The callback function will be invoked once it has been received.
GLOBUS_GASS_TRANSFER_ERROR_NULL_POINTER The bytes or callback parameter was NULL.
GLOBUS_GASS_TRANSFER_ERROR_INVALID_USER The request was invalid, or it is not one on which bytes can be sent.
GLOBUS_GASS_TRANSFER_ERROR_NOT_INITIALIZED The callback to a non-blocking file request has not been invoked yet, a blocking file request has not returned, or the request has not yet been authorized.
GLOBUS_GASS_TRANSFER_ERROR_REQUEST_FAILED The request has failed by either the client, server, or protocol module implementation.
GLOBUS_GASS_TRANSFER_ERROR_DONE The request has already been completed.

Send a byte array associated with a request handle.

This function sends a block of data to a server or client as part of the processing for a request. Multiple data blocks may be registered with the GASS transfer library at once.

When processing a server request, this function may only be used in conjunction with 'get' requests. The user must call globus_gass_transfer_authorize() before calling this function.

When processing a client request, this function may only be used in conjunction with 'put' or 'append' requests. This function may not be called before either the callback function has been invoked, or the blocking globus_gass_tranfser_put() or globus_gass_transfer_append() function has returned.

Parameters

request The request handle with which this block of bytes is associated.
bytes A user-supplied buffer containing the data associated with the request.
send_length The length of the bytes array.
last_data A flag to indicate whether this is the final block of data for the request. If this is true, then the callback function will be delayed until the server acknowledges that the file has been completely received.
callback Function to call once the bytes array has been sent.
user_arg Argument to be passed to the callback function.

Return values

GLOBUS_SUCCESS The bytes array was successfully registered with the GASS transfer library. The callback function will be invoked once it has been sent.
GLOBUS_GASS_TRANSFER_ERROR_NULL_POINTER The bytes or callback parameter was NULL.
GLOBUS_GASS_TRANSFER_ERROR_INVALID_USER The request was invalid, or it is not one on which bytes can be sent.
GLOBUS_GASS_TRANSFER_ERROR_NOT_INITIALIZED The callback to a non-blocking file request has not been invoked yet, a blocking file request has not returned, or the request has not yet been authorized.
GLOBUS_GASS_TRANSFER_ERROR_REQUEST_FAILED The request has failed by either the client, server, or protocol module implementation.
GLOBUS_GASS_TRANSFER_ERROR_DONE The request has already been completed.

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