AHASH_REQUEST_SET_CA(9)               Programming Interface               AHASH_REQUEST_SET_CA(9)



NAME
       ahash_request_set_callback - set asynchronous callback function

SYNOPSIS
       void ahash_request_set_callback(struct ahash_request * req, u32 flags,
                                       crypto_completion_t compl, void * data);

ARGUMENTS
       req
           request handle

       flags
           specify zero or an ORing of the flags CRYPTO_TFM_REQ_MAY_BACKLOG the request queue may
           back log and increase the wait queue beyond the initial maximum size;
           CRYPTO_TFM_REQ_MAY_SLEEP the request processing may sleep

       compl
           callback function pointer to be registered with the request handle

       data
           The data pointer refers to memory that is not used by the kernel crypto API, but
           provided to the callback function for it to use. Here, the caller can provide a
           reference to memory the callback function can operate on. As the callback function is
           invoked asynchronously to the related functionality, it may need to access data
           structures of the related functionality which can be referenced using this pointer.
           The callback function can access the memory via the “data” field in the
           crypto_async_request data structure provided to the callback function.

DESCRIPTION
       This function allows setting the callback function that is triggered once the cipher
       operation completes.

       The callback function is registered with the ahash_request handle and must comply with the
       following template

       void callback_function(struct crypto_async_request *req, int error)

AUTHORS
       Stephan Mueller <smueller AT chronox.de>
           Author.

       Marek Vasut <marek AT denx.de>
           Author.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                   AHASH_REQUEST_SET_CA(9)