1 /* Convert between the kernel's `struct stat' format, and libc's.
2 Copyright (C) 1991-2021 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #include <assert.h>
20 #include <errno.h>
21 #include <sys/stat.h>
22 #include <kernel_stat.h>
23 #include <string.h>
24
25 int
__xstat_conv(int vers,struct kernel_stat * kbuf,void * ubuf)26 __xstat_conv (int vers, struct kernel_stat *kbuf, void *ubuf)
27 {
28 switch (vers)
29 {
30 case _STAT_VER_KERNEL:
31 /* Nothing to do. The struct is in the form the kernel expects.
32 We should have short-circuted before we got here, but for
33 completeness... */
34 *(struct kernel_stat *) ubuf = *kbuf;
35 break;
36
37 case _STAT_VER_LINUX:
38 {
39 struct stat *buf = ubuf;
40
41 /* Convert to current kernel version of `struct stat'. */
42 buf->st_dev = kbuf->st_dev;
43 buf->__pad1 = 0;
44 buf->st_ino = kbuf->st_ino;
45 buf->st_mode = kbuf->st_mode;
46 buf->st_nlink = kbuf->st_nlink;
47 buf->st_uid = kbuf->st_uid;
48 buf->st_gid = kbuf->st_gid;
49 buf->st_rdev = kbuf->st_rdev;
50 buf->__pad2 = 0;
51 buf->st_size = kbuf->st_size;
52 buf->st_blksize = kbuf->st_blksize;
53 buf->st_blocks = kbuf->st_blocks;
54 buf->st_atim.tv_sec = kbuf->st_atime_sec;
55 buf->st_atim.tv_nsec = 0;
56 buf->st_mtim.tv_sec = kbuf->st_mtime_sec;
57 buf->st_mtim.tv_nsec = 0;
58 buf->st_ctim.tv_sec = kbuf->st_ctime_sec;
59 buf->st_ctim.tv_nsec = 0;
60 buf->__glibc_reserved4 = 0;
61 buf->__glibc_reserved5 = 0;
62 }
63 break;
64
65 default:
66 __set_errno (EINVAL);
67 return -1;
68 }
69
70 return 0;
71 }
72
73 int
__xstat32_conv(int vers,struct stat64 * sbuf,struct stat * buf)74 __xstat32_conv (int vers, struct stat64 *sbuf, struct stat *buf)
75 {
76 struct kernel_stat64 *kbuf;
77
78 /* *stat64 syscalls on sparc64 really fill in struct kernel_stat64,
79 rather than struct stat64. But it is the same size as
80 struct kernel_stat64, so use this hack so that we can reuse
81 i386 {,f,l}xstat{,at}.c routines. */
82 __asm ("" : "=r" (kbuf) : "0" (sbuf));
83 assert (sizeof (struct stat) == sizeof (struct stat64));
84 assert (sizeof (struct stat64) >= sizeof (struct kernel_stat64));
85
86 switch (vers)
87 {
88 case _STAT_VER_LINUX:
89 {
90 /* Convert current kernel version of `struct stat64' to
91 `struct stat'. */
92 buf->st_dev = kbuf->st_dev;
93 buf->__pad1 = 0;
94 buf->st_ino = kbuf->st_ino;
95 buf->st_mode = kbuf->st_mode;
96 buf->st_nlink = kbuf->st_nlink;
97 buf->st_uid = kbuf->st_uid;
98 buf->st_gid = kbuf->st_gid;
99 buf->st_rdev = kbuf->st_rdev;
100 buf->__pad2 = 0;
101 buf->st_size = kbuf->st_size;
102 buf->st_blksize = kbuf->st_blksize;
103 buf->st_blocks = kbuf->st_blocks;
104 buf->st_atim.tv_sec = kbuf->st_atime_sec;
105 buf->st_atim.tv_nsec = kbuf->st_atime_nsec;
106 buf->st_mtim.tv_sec = kbuf->st_mtime_sec;
107 buf->st_mtim.tv_nsec = kbuf->st_mtime_nsec;
108 buf->st_ctim.tv_sec = kbuf->st_ctime_sec;
109 buf->st_ctim.tv_nsec = kbuf->st_ctime_nsec;
110 buf->__glibc_reserved4 = 0;
111 buf->__glibc_reserved5 = 0;
112 }
113 break;
114
115 /* If struct stat64 is different from struct stat then
116 _STAT_VER_KERNEL does not make sense. */
117 case _STAT_VER_KERNEL:
118 default:
119 __set_errno (EINVAL);
120 return -1;
121 }
122
123 return 0;
124 }
125