1 /* Get file status. Linux version.
2 Copyright (C) 2020-2021 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 #define __fstatat __redirect___fstatat
20 #define fstatat __redirect_fstatat
21 #include <sys/stat.h>
22 #include <fcntl.h>
23 #include <string.h>
24 #include <kernel_stat.h>
25 #include <sysdep.h>
26 #include <time.h>
27 #include <kstat_cp.h>
28 #include <stat_t64_cp.h>
29 #include <sys/sysmacros.h>
30
31 #if __TIMESIZE == 64 \
32 && (__WORDSIZE == 32 \
33 && (!defined __SYSCALL_WORDSIZE || __SYSCALL_WORDSIZE == 32))
34 /* Sanity check to avoid newer 32-bit ABI to support non-LFS calls. */
35 _Static_assert (sizeof (__off_t) == sizeof (__off64_t),
36 "__blkcnt_t and __blkcnt64_t must match");
37 _Static_assert (sizeof (__ino_t) == sizeof (__ino64_t),
38 "__blkcnt_t and __blkcnt64_t must match");
39 _Static_assert (sizeof (__blkcnt_t) == sizeof (__blkcnt64_t),
40 "__blkcnt_t and __blkcnt64_t must match");
41 #endif
42
43 static inline int
fstatat64_time64_statx(int fd,const char * file,struct __stat64_t64 * buf,int flag)44 fstatat64_time64_statx (int fd, const char *file, struct __stat64_t64 *buf,
45 int flag)
46 {
47 /* 32-bit kABI with default 64-bit time_t, e.g. arc, riscv32. Also
48 64-bit time_t support is done through statx syscall. */
49 struct statx tmp;
50 int r = INTERNAL_SYSCALL_CALL (statx, fd, file, AT_NO_AUTOMOUNT | flag,
51 STATX_BASIC_STATS, &tmp);
52 if (r != 0)
53 return r;
54
55 *buf = (struct __stat64_t64) {
56 .st_dev = __gnu_dev_makedev (tmp.stx_dev_major, tmp.stx_dev_minor),
57 .st_rdev = __gnu_dev_makedev (tmp.stx_rdev_major, tmp.stx_rdev_minor),
58 .st_ino = tmp.stx_ino,
59 .st_mode = tmp.stx_mode,
60 .st_nlink = tmp.stx_nlink,
61 .st_uid = tmp.stx_uid,
62 .st_gid = tmp.stx_gid,
63 .st_atime = tmp.stx_atime.tv_sec,
64 .st_atim.tv_nsec = tmp.stx_atime.tv_nsec,
65 .st_mtime = tmp.stx_mtime.tv_sec,
66 .st_mtim.tv_nsec = tmp.stx_mtime.tv_nsec,
67 .st_ctime = tmp.stx_ctime.tv_sec,
68 .st_ctim.tv_nsec = tmp.stx_ctime.tv_nsec,
69 .st_size = tmp.stx_size,
70 .st_blocks = tmp.stx_blocks,
71 .st_blksize = tmp.stx_blksize,
72 };
73
74 return r;
75 }
76
77 #if (__WORDSIZE == 32 \
78 && (!defined __SYSCALL_WORDSIZE || __SYSCALL_WORDSIZE == 32)) \
79 || defined STAT_HAS_TIME32
80 # define FSTATAT_USE_STATX 1
81 #else
82 # define FSTATAT_USE_STATX 0
83 #endif
84
85 /* Only statx supports 64-bit timestamps for 32-bit architectures with
86 __ASSUME_STATX, so there is no point in building the fallback. */
87 #if !FSTATAT_USE_STATX || (FSTATAT_USE_STATX && !defined __ASSUME_STATX)
88 static inline int
fstatat64_time64_stat(int fd,const char * file,struct __stat64_t64 * buf,int flag)89 fstatat64_time64_stat (int fd, const char *file, struct __stat64_t64 *buf,
90 int flag)
91 {
92 int r;
93
94 #if XSTAT_IS_XSTAT64
95 # ifdef __NR_newfstatat
96 /* 64-bit kABI, e.g. aarch64, ia64, powerpc64*, s390x, riscv64, and
97 x86_64. */
98 r = INTERNAL_SYSCALL_CALL (newfstatat, fd, file, buf, flag);
99 # elif defined __NR_fstatat64
100 # if STAT64_IS_KERNEL_STAT64
101 /* 64-bit kABI outlier, e.g. alpha */
102 r = INTERNAL_SYSCALL_CALL (fstatat64, fd, file, buf, flag);
103 # else
104 /* 64-bit kABI outlier, e.g. sparc64. */
105 struct kernel_stat64 kst64;
106 r = INTERNAL_SYSCALL_CALL (fstatat64, fd, file, &kst64, flag);
107 if (r == 0)
108 __cp_stat64_kstat64 (buf, &kst64);
109 # endif
110 # endif
111 #else
112 # ifdef __NR_fstatat64
113 /* All kABIs with non-LFS support and with old 32-bit time_t support
114 e.g. arm, csky, i386, hppa, m68k, microblaze, nios2, sh, powerpc32,
115 and sparc32. */
116 struct stat64 st64;
117 r = INTERNAL_SYSCALL_CALL (fstatat64, fd, file, &st64, flag);
118 if (r == 0)
119 {
120 /* Clear both pad and reserved fields. */
121 memset (buf, 0, sizeof (*buf));
122
123 buf->st_dev = st64.st_dev,
124 buf->st_ino = st64.st_ino;
125 buf->st_mode = st64.st_mode;
126 buf->st_nlink = st64.st_nlink;
127 buf->st_uid = st64.st_uid;
128 buf->st_gid = st64.st_gid;
129 buf->st_rdev = st64.st_rdev;
130 buf->st_size = st64.st_size;
131 buf->st_blksize = st64.st_blksize;
132 buf->st_blocks = st64.st_blocks;
133 buf->st_atim = valid_timespec_to_timespec64 (st64.st_atim);
134 buf->st_mtim = valid_timespec_to_timespec64 (st64.st_mtim);
135 buf->st_ctim = valid_timespec_to_timespec64 (st64.st_ctim);
136 }
137 # else
138 /* 64-bit kabi outlier, e.g. mips64 and mips64-n32. */
139 struct kernel_stat kst;
140 r = INTERNAL_SYSCALL_CALL (newfstatat, fd, file, &kst, flag);
141 if (r == 0)
142 __cp_kstat_stat64_t64 (&kst, buf);
143 # endif
144 #endif
145
146 return r;
147 }
148 #endif
149
150 int
__fstatat64_time64(int fd,const char * file,struct __stat64_t64 * buf,int flag)151 __fstatat64_time64 (int fd, const char *file, struct __stat64_t64 *buf,
152 int flag)
153 {
154 int r;
155
156 #if FSTATAT_USE_STATX
157 r = fstatat64_time64_statx (fd, file, buf, flag);
158 # ifndef __ASSUME_STATX
159 if (r == -ENOSYS)
160 r = fstatat64_time64_stat (fd, file, buf, flag);
161 # endif
162 #else
163 r = fstatat64_time64_stat (fd, file, buf, flag);
164 #endif
165
166 return INTERNAL_SYSCALL_ERROR_P (r)
167 ? INLINE_SYSCALL_ERROR_RETURN_VALUE (-r)
168 : 0;
169 }
170 #if __TIMESIZE != 64
hidden_def(__fstatat64_time64)171 hidden_def (__fstatat64_time64)
172
173 int
174 __fstatat64 (int fd, const char *file, struct stat64 *buf, int flags)
175 {
176 struct __stat64_t64 st_t64;
177 return __fstatat64_time64 (fd, file, &st_t64, flags)
178 ?: __cp_stat64_t64_stat64 (&st_t64, buf);
179 }
180 #endif
181
182 #undef __fstatat
183 #undef fstatat
184
185 hidden_def (__fstatat64)
186 weak_alias (__fstatat64, fstatat64)
187
188 #if XSTAT_IS_XSTAT64
189 strong_alias (__fstatat64, __fstatat)
190 weak_alias (__fstatat64, fstatat)
191 strong_alias (__fstatat64, __GI___fstatat);
192 #endif
193