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/*
*
* (C) COPYRIGHT 2017 ARM Limited. All rights reserved.
*
* This program is free software and is provided to you under the terms of the
* GNU General Public License version 2 as published by the Free Software
* Foundation, and any use by you of this program is subject to the terms
* of such GNU licence.
*
* A copy of the licence is included with the program, and can also be obtained
* from Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifndef _KERNEL_UTF_HELPERS_H_
#define _KERNEL_UTF_HELPERS_H_
/* kutf_helpers.h
* Test helper functions for the kernel UTF test infrastructure.
*
* These functions provide methods for enqueuing/dequeuing lines of text sent
* by user space. They are used to implement the transfer of "userdata" from
* user space to kernel.
*/
#include <kutf/kutf_suite.h>
/**
* kutf_helper_input_dequeue() - Dequeue a line sent by user space
* @context: KUTF context
* @str_size: Pointer to an integer to receive the size of the string
*
* If no line is available then this function will wait (interruptibly) until
* a line is available.
*
* Return: The line dequeued, ERR_PTR(-EINTR) if interrupted or NULL on end
* of data.
*/
char *kutf_helper_input_dequeue(struct kutf_context *context, size_t *str_size);
/**
* kutf_helper_input_enqueue() - Enqueue a line sent by user space
* @context: KUTF context
* @str: The user space address of the line
* @size: The length in bytes of the string
*
* This function will use copy_from_user to copy the string out of user space.
* The string need not be NULL-terminated (@size should not include the NULL
* termination).
*
* As a special case @str==NULL and @size==0 is valid to mark the end of input,
* but callers should use kutf_helper_input_enqueue_end_of_data() instead.
*
* Return: 0 on success, -EFAULT if the line cannot be copied from user space,
* -ENOMEM if out of memory.
*/
int kutf_helper_input_enqueue(struct kutf_context *context,
const char __user *str, size_t size);
/**
* kutf_helper_input_enqueue_end_of_data() - Signal no more data is to be sent
* @context: KUTF context
*
* After this function has been called, kutf_helper_input_dequeue() will always
* return NULL.
*/
void kutf_helper_input_enqueue_end_of_data(struct kutf_context *context);
#endif /* _KERNEL_UTF_HELPERS_H_ */
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