'\" t
.\"     Title: skcipher_request_set_callback
.\"    Author: 
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: April 2019
.\"    Manual: Programming Interface
.\"    Source: Kernel Hackers Manual 4.9.168
.\"  Language: English
.\"
.TH "SKCIPHER_REQUEST_SET" "9" "April 2019" "Kernel Hackers Manual 4\&.9\&." "Programming Interface"
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.SH "NAME"
skcipher_request_set_callback \- set asynchronous callback function
.SH "SYNOPSIS"
.HP \w'void\ skcipher_request_set_callback('u
.BI "void skcipher_request_set_callback(struct\ skcipher_request\ *\ " "req" ", u32\ " "flags" ", crypto_completion_t\ " "compl" ", void\ *\ " "data" ");"
.SH "ARGUMENTS"
.PP
\fIreq\fR
.RS 4
request handle
.RE
.PP
\fIflags\fR
.RS 4
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
.RE
.PP
\fIcompl\fR
.RS 4
callback function pointer to be registered with the request handle
.RE
.PP
\fIdata\fR
.RS 4
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
\(lqdata\(rq
field in the crypto_async_request data structure provided to the callback function\&.
.RE
.SH "DESCRIPTION"
.PP
This function allows setting the callback function that is triggered once the cipher operation completes\&.
.PP
The callback function is registered with the skcipher_request handle and must comply with the following template
.PP
void callback_function(struct crypto_async_request *req, int error)
.SH "AUTHORS"
.PP
\fBStephan Mueller\fR <\&smueller@chronox.de\&>
.RS 4
Author.
.RE
.PP
\fBMarek Vasut\fR <\&marek@denx.de\&>
.RS 4
Author.
.RE
.SH "COPYRIGHT"
.br