sysdeps/unix/sysv/linux/fstatat64.c

   1 /* Get file status.  Linux version.
   2    Copyright (C) 2020-2023 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 #if (__WORDSIZE == 32 \
  44      && (!defined __SYSCALL_WORDSIZE || __SYSCALL_WORDSIZE == 32)) \
  45      || defined STAT_HAS_TIME32 \
  46      || (!defined __NR_newfstatat && !defined __NR_fstatat64)
  47 # define FSTATAT_USE_STATX 1
  48
  49 static inline int
  50 fstatat64_time64_statx (int fd, const char *file, struct __stat64_t64 *buf,
  51                         int flag)
  52 {
  53   /* 32-bit kABI with default 64-bit time_t, e.g. arc, riscv32.   Also
  54      64-bit time_t support is done through statx syscall.  */
  55   struct statx tmp;
  56   int r = INTERNAL_SYSCALL_CALL (statx, fd, file, AT_NO_AUTOMOUNT | flag,
  57                                  STATX_BASIC_STATS, &tmp);
  58   if (r != 0)
  59     return r;
  60
  61   *buf = (struct __stat64_t64) {
  62     .st_dev = __gnu_dev_makedev (tmp.stx_dev_major, tmp.stx_dev_minor),
  63     .st_rdev = __gnu_dev_makedev (tmp.stx_rdev_major, tmp.stx_rdev_minor),
  64     .st_ino = tmp.stx_ino,
  65     .st_mode = tmp.stx_mode,
  66     .st_nlink = tmp.stx_nlink,
  67     .st_uid = tmp.stx_uid,
  68     .st_gid = tmp.stx_gid,
  69     .st_atime = tmp.stx_atime.tv_sec,
  70     .st_atim.tv_nsec = tmp.stx_atime.tv_nsec,
  71     .st_mtime = tmp.stx_mtime.tv_sec,
  72     .st_mtim.tv_nsec = tmp.stx_mtime.tv_nsec,
  73     .st_ctime = tmp.stx_ctime.tv_sec,
  74     .st_ctim.tv_nsec = tmp.stx_ctime.tv_nsec,
  75     .st_size = tmp.stx_size,
  76     .st_blocks = tmp.stx_blocks,
  77     .st_blksize = tmp.stx_blksize,
  78   };
  79
  80   return r;
  81 }
  82 #else
  83 # define FSTATAT_USE_STATX 0
  84 #endif
  85
  86 /* Only statx supports 64-bit timestamps for 32-bit architectures with
  87    __ASSUME_STATX, so there is no point in building the fallback.  */
  88 #if !FSTATAT_USE_STATX || (FSTATAT_USE_STATX && !defined __ASSUME_STATX)
  89 static inline int
  90 fstatat64_time64_stat (int fd, const char *file, struct __stat64_t64 *buf,
  91                        int flag)
  92 {
  93   int r;
  94
  95 #if XSTAT_IS_XSTAT64
  96 # ifdef __NR_newfstatat
  97   /* 64-bit kABI, e.g. aarch64, ia64, powerpc64*, s390x, riscv64, and
  98      x86_64.  */
  99   r = INTERNAL_SYSCALL_CALL (newfstatat, fd, file, buf, flag);
 100 # elif defined __NR_fstatat64
 101 #  if STAT64_IS_KERNEL_STAT64
 102   /* 64-bit kABI outlier, e.g. alpha  */
 103   r = INTERNAL_SYSCALL_CALL (fstatat64, fd, file, buf, flag);
 104 #  else
 105   /* 64-bit kABI outlier, e.g. sparc64.  */
 106   struct kernel_stat64 kst64;
 107   r = INTERNAL_SYSCALL_CALL (fstatat64, fd, file, &kst64, flag);
 108   if (r == 0)
 109     __cp_stat64_kstat64 (buf, &kst64);
 110 #  endif
 111 # endif
 112 #else
 113 # ifdef __NR_fstatat64
 114   /* All kABIs with non-LFS support and with old 32-bit time_t support
 115      e.g. arm, csky, i386, hppa, m68k, microblaze, nios2, sh, powerpc32,
 116      and sparc32.  */
 117   struct stat64 st64;
 118   r = INTERNAL_SYSCALL_CALL (fstatat64, fd, file, &st64, flag);
 119   if (r == 0)
 120     {
 121       /* Clear both pad and reserved fields.  */
 122       memset (buf, 0, sizeof (*buf));
 123
 124       buf->st_dev = st64.st_dev,
 125       buf->st_ino = st64.st_ino;
 126       buf->st_mode = st64.st_mode;
 127       buf->st_nlink = st64.st_nlink;
 128       buf->st_uid = st64.st_uid;
 129       buf->st_gid = st64.st_gid;
 130       buf->st_rdev = st64.st_rdev;
 131       buf->st_size = st64.st_size;
 132       buf->st_blksize = st64.st_blksize;
 133       buf->st_blocks  = st64.st_blocks;
 134       buf->st_atim = valid_timespec_to_timespec64 (st64.st_atim);
 135       buf->st_mtim = valid_timespec_to_timespec64 (st64.st_mtim);
 136       buf->st_ctim = valid_timespec_to_timespec64 (st64.st_ctim);
 137     }
 138 # else
 139   /* 64-bit kabi outlier, e.g. mips64 and mips64-n32.  */
 140   struct kernel_stat kst;
 141   r = INTERNAL_SYSCALL_CALL (newfstatat, fd, file, &kst, flag);
 142   if (r == 0)
 143     __cp_kstat_stat64_t64 (&kst, buf);
 144 # endif
 145 #endif
 146
 147   return r;
 148 }
 149 #endif
 150
 151 int
 152 __fstatat64_time64 (int fd, const char *file, struct __stat64_t64 *buf,
 153                     int flag)
 154 {
 155   int r;
 156
 157 #if FSTATAT_USE_STATX
 158   r = fstatat64_time64_statx (fd, file, buf, flag);
 159 # ifndef __ASSUME_STATX
 160   if (r == -ENOSYS)
 161     r = fstatat64_time64_stat (fd, file, buf, flag);
 162 # endif
 163 #else
 164   r = fstatat64_time64_stat (fd, file, buf, flag);
 165 #endif
 166
 167   return INTERNAL_SYSCALL_ERROR_P (r)
 168          ? INLINE_SYSCALL_ERROR_RETURN_VALUE (-r)
 169          : 0;
 170 }
 171 #if __TIMESIZE != 64
 172 hidden_def (__fstatat64_time64)
 173
 174 int
 175 __fstatat64 (int fd, const char *file, struct stat64 *buf, int flags)
 176 {
 177   struct __stat64_t64 st_t64;
 178   return __fstatat64_time64 (fd, file, &st_t64, flags)
 179          ?: __cp_stat64_t64_stat64 (&st_t64, buf);
 180 }
 181 #endif
 182
 183 #undef __fstatat
 184 #undef fstatat
 185
 186 hidden_def (__fstatat64)
 187 weak_alias (__fstatat64, fstatat64)
 188
 189 #if XSTAT_IS_XSTAT64
 190 strong_alias (__fstatat64, __fstatat)
 191 weak_alias (__fstatat64, fstatat)
 192 strong_alias (__fstatat64, __GI___fstatat);
 193 #endif