1 /*
2 * Copyright (c) 2015 Dmitry V. Levin <ldv@altlinux.org>
3 * Copyright (c) 2015-2017 The strace developers.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include "defs.h"
30
31 #include DEF_MPERS_TYPE(struct_flock)
32 #include DEF_MPERS_TYPE(struct_flock64)
33
34 #include "flock.h"
35 typedef struct_kernel_flock struct_flock;
36 typedef struct_kernel_flock64 struct_flock64;
37
38 #include MPERS_DEFS
39
40 #define SIZEOF_MEMBER(type, member) \
41 sizeof(((type *) NULL)->member)
42
43 #define FLOCK_MEMBERS_EQ(type, member) \
44 (SIZEOF_MEMBER(struct_kernel_flock64, member) == SIZEOF_MEMBER(type, member) \
45 && offsetof(struct_kernel_flock64, member) == offsetof(type, member))
46
47 #define FLOCK_STRUCTS_EQ(type) \
48 (sizeof(struct_kernel_flock64) == sizeof(type) \
49 && FLOCK_MEMBERS_EQ(type, l_type) \
50 && FLOCK_MEMBERS_EQ(type, l_whence) \
51 && FLOCK_MEMBERS_EQ(type, l_start) \
52 && FLOCK_MEMBERS_EQ(type, l_len) \
53 && FLOCK_MEMBERS_EQ(type, l_pid))
54
MPERS_PRINTER_DECL(bool,fetch_struct_flock,struct tcb * const tcp,const kernel_ulong_t addr,void * const p)55 MPERS_PRINTER_DECL(bool, fetch_struct_flock, struct tcb *const tcp,
56 const kernel_ulong_t addr, void *const p)
57 {
58 struct_kernel_flock64 *pfl = p;
59 struct_flock mfl;
60
61 if (FLOCK_STRUCTS_EQ(struct_flock))
62 return !umove_or_printaddr(tcp, addr, pfl);
63
64 if (umove_or_printaddr(tcp, addr, &mfl))
65 return false;
66
67 pfl->l_type = mfl.l_type;
68 pfl->l_whence = mfl.l_whence;
69 pfl->l_start = mfl.l_start;
70 pfl->l_len = mfl.l_len;
71 pfl->l_pid = mfl.l_pid;
72 return true;
73 }
74
MPERS_PRINTER_DECL(bool,fetch_struct_flock64,struct tcb * const tcp,const kernel_ulong_t addr,void * const p)75 MPERS_PRINTER_DECL(bool, fetch_struct_flock64, struct tcb *const tcp,
76 const kernel_ulong_t addr, void *const p)
77 {
78 struct_kernel_flock64 *pfl = p;
79 struct_flock64 mfl;
80
81 if (FLOCK_STRUCTS_EQ(struct_flock64))
82 return !umove_or_printaddr(tcp, addr, pfl);
83
84 if (umove_or_printaddr(tcp, addr, &mfl))
85 return false;
86
87 pfl->l_type = mfl.l_type;
88 pfl->l_whence = mfl.l_whence;
89 pfl->l_start = mfl.l_start;
90 pfl->l_len = mfl.l_len;
91 pfl->l_pid = mfl.l_pid;
92 return true;
93 }
94