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
43static inline int
44fstatat64_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
77static inline int
78fstatat64_time64_stat (int fd, const char *file, struct __stat64_t64 *buf,
79 int flag)
80{
81 int r;
82
83#if XSTAT_IS_XSTAT64
84# ifdef __NR_newfstatat
85 /* 64-bit kABI, e.g. aarch64, ia64, powerpc64*, s390x, riscv64, and
86 x86_64. */
87 r = INTERNAL_SYSCALL_CALL (newfstatat, fd, file, buf, flag);
88# elif defined __NR_fstatat64
89# if STAT64_IS_KERNEL_STAT64
90 /* 64-bit kABI outlier, e.g. alpha */
91 r = INTERNAL_SYSCALL_CALL (fstatat64, fd, file, buf, flag);
92# else
93 /* 64-bit kABI outlier, e.g. sparc64. */
94 struct kernel_stat64 kst64;
95 r = INTERNAL_SYSCALL_CALL (fstatat64, fd, file, &kst64, flag);
96 if (r == 0)
97 __cp_stat64_kstat64 (buf, &kst64);
98# endif
99# endif
100#else
101# ifdef __NR_fstatat64
102 /* All kABIs with non-LFS support and with old 32-bit time_t support
103 e.g. arm, csky, i386, hppa, m68k, microblaze, nios2, sh, powerpc32,
104 and sparc32. */
105 struct stat64 st64;
106 r = INTERNAL_SYSCALL_CALL (fstatat64, fd, file, &st64, flag);
107 if (r == 0)
108 {
109 /* Clear both pad and reserved fields. */
110 memset (buf, 0, sizeof (*buf));
111
112 buf->st_dev = st64.st_dev,
113 buf->st_ino = st64.st_ino;
114 buf->st_mode = st64.st_mode;
115 buf->st_nlink = st64.st_nlink;
116 buf->st_uid = st64.st_uid;
117 buf->st_gid = st64.st_gid;
118 buf->st_rdev = st64.st_rdev;
119 buf->st_size = st64.st_size;
120 buf->st_blksize = st64.st_blksize;
121 buf->st_blocks = st64.st_blocks;
122 buf->st_atim = valid_timespec_to_timespec64 (st64.st_atim);
123 buf->st_mtim = valid_timespec_to_timespec64 (st64.st_mtim);
124 buf->st_ctim = valid_timespec_to_timespec64 (st64.st_ctim);
125 }
126# else
127 /* 64-bit kabi outlier, e.g. mips64 and mips64-n32. */
128 struct kernel_stat kst;
129 r = INTERNAL_SYSCALL_CALL (newfstatat, fd, file, &kst, flag);
130 if (r == 0)
131 __cp_kstat_stat64_t64 (&kst, buf);
132# endif
133#endif
134
135 return r;
136}
137
138#if (__WORDSIZE == 32 \
139 && (!defined __SYSCALL_WORDSIZE || __SYSCALL_WORDSIZE == 32)) \
140 || defined STAT_HAS_TIME32
141# define FSTATAT_USE_STATX 1
142#else
143# define FSTATAT_USE_STATX 0
144#endif
145
146int
147__fstatat64_time64 (int fd, const char *file, struct __stat64_t64 *buf,
148 int flag)
149{
150 int r;
151
152#if FSTATAT_USE_STATX
153 r = fstatat64_time64_statx (fd, file, buf, flag);
154# ifndef __ASSUME_STATX
155 if (r == -ENOSYS)
156 r = fstatat64_time64_stat (fd, file, buf, flag);
157# endif
158#else
159 r = fstatat64_time64_stat (fd, file, buf, flag);
160#endif
161
162 return INTERNAL_SYSCALL_ERROR_P (r)
163 ? INLINE_SYSCALL_ERROR_RETURN_VALUE (-r)
164 : 0;
165}
166#if __TIMESIZE != 64
167hidden_def (__fstatat64_time64)
168
169int
170__fstatat64 (int fd, const char *file, struct stat64 *buf, int flags)
171{
172 struct __stat64_t64 st_t64;
173 return __fstatat64_time64 (fd, file, &st_t64, flags)
174 ?: __cp_stat64_t64_stat64 (&st_t64, buf);
175}
176#endif
177
178#undef __fstatat
179#undef fstatat
180
181hidden_def (__fstatat64)
182weak_alias (__fstatat64, fstatat64)
183
184#if XSTAT_IS_XSTAT64
185strong_alias (__fstatat64, __fstatat)
186weak_alias (__fstatat64, fstatat)
187strong_alias (__fstatat64, __GI___fstatat);
188#endif
189