summaryrefslogtreecommitdiff
path: root/sys/compat/linux/common/linux_fcntl.h
blob: cfaa3add61deb977b990a8977f7f479e68073505 (plain)
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
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
/*	$NetBSD: linux_fcntl.h,v 1.14 2008/04/28 20:23:43 martin Exp $	*/

/*-
 * Copyright (c) 1995, 1998 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Frank van der Linden and Eric Haszlakiewicz.
 *
 * 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.
 * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

#ifndef _LINUX_FCNTL_H
#define _LINUX_FCNTL_H

/*
 * The arguments in the flock structure have a different order from the
 * BSD structure.
 */

/* read/write mode for open(2) */
#define	LINUX_O_RDONLY		0x0000
#define LINUX_O_WRONLY		0x0001
#define LINUX_O_RDWR		0x0002
#define LINUX_O_ACCMODE		0x0003

struct linux_flock {
	short       l_type;
	short       l_whence;
	linux_off_t l_start;
	linux_off_t l_len;
	linux_pid_t l_pid;
};

struct linux_flock64 {
	short       l_type;
	short       l_whence;
	off_t	    l_start;
	off_t	    l_len;
	linux_pid_t l_pid;
};

#if defined(__i386__)
#include <compat/linux/arch/i386/linux_fcntl.h>
#elif defined(__m68k__)
#include <compat/linux/arch/m68k/linux_fcntl.h>
#elif defined(__alpha__)
#include <compat/linux/arch/alpha/linux_fcntl.h>
#elif defined(__powerpc__)
#include <compat/linux/arch/powerpc/linux_fcntl.h>
#elif defined(__mips__)
#include <compat/linux/arch/mips/linux_fcntl.h>
#elif defined(__arm__)
#include <compat/linux/arch/arm/linux_fcntl.h>
#elif defined(__amd64__)
#include <compat/linux/arch/amd64/linux_fcntl.h>
#else
#error Undefined linux_fcntl.h machine type.
#endif

/*
 * We have to have 4 copies of the code that converts linux fcntl() file
 * locking to native form because there are 4 layouts for the structures.
 * To avoid replicating code, these defines are used.
 *
 * The next two functions take care of converting the flock
 * structure back and forth between Linux and NetBSD format.
 * The only difference in the structures is the order and size of
 * the fields, and the 'whence' value.
 */

#define conv_linux_flock(LINUX, FLOCK) \
static void \
bsd_to_##LINUX##_##FLOCK(struct LINUX##_##FLOCK *lfp, const struct flock *bfp) \
	copy_flock(lfp, LINUX_F, bfp, F) \
\
static void \
LINUX##_to_bsd_##FLOCK(struct flock *bfp, const struct LINUX##_##FLOCK *lfp) \
	copy_flock(bfp, F, lfp, LINUX_F)

#define copy_flock(dst, dst_f, src, src_f) { \
	dst->l_start = src->l_start; \
	dst->l_len = src->l_len; \
	dst->l_pid = src->l_pid; \
	dst->l_whence = src->l_whence; \
	switch (src->l_type) { \
	case src_f##_RDLCK: \
		dst->l_type = dst_f##_RDLCK; \
		break; \
	case src_f##_UNLCK: \
		dst->l_type = dst_f##_UNLCK; \
		break; \
	case src_f##_WRLCK: \
		dst->l_type = dst_f##_WRLCK; \
		break; \
	} \
    }

/*
 * These two defines do the work within the sys_fcntl() switch statement.
 */

#define do_linux_getlk(fd, cmd, arg, LINUX, FLOCK) do { \
	struct LINUX##_##FLOCK lfl; \
	struct flock bfl; \
	int fl_error; \
	if ((fl_error = copyin(arg, &lfl, sizeof lfl))) \
		return fl_error; \
	LINUX##_to_bsd_##FLOCK(&bfl, &lfl); \
	fl_error = do_fcntl_lock(fd, F_GETLK, &bfl); \
	if (fl_error) \
		return fl_error; \
	bsd_to_##LINUX##_##FLOCK(&lfl, &bfl); \
	return copyout(&lfl, arg, sizeof lfl); \
    } while (0)

#define do_linux_setlk(fd, cmd, arg, LINUX, FLOCK, setlk) do { \
	struct LINUX##_##FLOCK lfl; \
	struct flock bfl; \
	int fl_error; \
	if ((fl_error = copyin(arg, &lfl, sizeof lfl))) \
		return fl_error; \
	LINUX##_to_bsd_##FLOCK(&bfl, &lfl); \
	return do_fcntl_lock(fd, cmd == setlk ? F_SETLK : F_SETLKW, &bfl); \
    } while (0)


#endif /* !_LINUX_FCNTL_H */