1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
|
/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2016 Jakub Klama <jceel@FreeBSD.org>.
* Copyright (c) 2018 Alexander Motin <mav@FreeBSD.org>
* Copyright (c) 2026 Hans Rosenfeld
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer
* in this position and unchanged.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/* This file is dual-licensed; see usr/src/contrib/bhyve/LICENSE */
/*
* Copyright 2025 Oxide Computer Company
*/
#ifndef _IOV_H_
#define _IOV_H_
#include <stdbool.h>
/* Number of additional iovecs required for split_iov() */
#define SPLIT_IOV_ADDL_IOV 2
struct iovec *split_iov(struct iovec *, size_t *, size_t, size_t *);
size_t count_iov(const struct iovec *, size_t);
bool check_iov_len(const struct iovec *, size_t, size_t);
ssize_t iov_to_buf(const struct iovec *, size_t, void **);
ssize_t buf_to_iov(const void *, size_t, const struct iovec *, size_t);
/*
* Helpers for performing operations on an array of iovec entries.
*/
typedef struct iov_bunch {
/*
* The current head of an array of iovec entries, which have an iov_len
* sum covering ib_remain bytes. This moves as the bunch is traversed.
*/
struct iovec *ib_iov;
/*
* Byte offset in current ib_iov entry.
*/
size_t ib_offset;
/*
* Bytes remaining in entries covered by ib_iov entries, not including
* the offset specified by ib_offset
*/
size_t ib_remain;
} iov_bunch_t;
extern size_t iov_bunch_init(iov_bunch_t *, struct iovec *, int);
extern bool iov_bunch_copy(iov_bunch_t *, void *, size_t);
extern bool iov_bunch_skip(iov_bunch_t *, size_t);
extern bool iov_bunch_next_chunk(iov_bunch_t *, caddr_t *, size_t *);
extern void iov_bunch_to_iov(iov_bunch_t *, struct iovec *, int *, uint_t);
extern ssize_t iov_bunch_to_buf(iov_bunch_t *iob, void **);
extern bool buf_to_iov_bunch(iov_bunch_t *, const void *, size_t);
#endif /* _IOV_H_ */
|