sysdeps/unix/sysv/linux/fstatat.c

   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 #include <sys/stat.h>
  20 #include <kernel_stat.h>
  21 #include <sysdep.h>
  22
  23 #if !XSTAT_IS_XSTAT64
  24 # include <kstat_cp.h>
  25
  26 int
  27 __fstatat (int fd, const char *file, struct stat *buf, int flag)
  28 {
  29   int r;
  30
  31 # if STAT_IS_KERNEL_STAT
  32   /* New kABIs which uses generic pre 64-bit time Linux ABI, e.g.
  33      csky, nios2  */
  34   r = INTERNAL_SYSCALL_CALL (fstatat64, fd, file, buf, flag);
  35   if (r == 0 && (buf->__st_ino_pad != 0
  36                  || buf->__st_size_pad != 0
  37                  || buf->__st_blocks_pad != 0))
  38     return INLINE_SYSCALL_ERROR_RETURN_VALUE (EOVERFLOW);
  39 # else
  40 #  ifdef __NR_fstatat64
  41   /* Old KABIs with old non-LFS support, e.g. arm, i386, hppa, m68k, mips32,
  42      microblaze, s390, sh, powerpc, and sparc.  */
  43   struct stat64 st64;
  44   r = INTERNAL_SYSCALL_CALL (fstatat64, fd, file, &st64, flag);
  45   if (r == 0)
  46     {
  47       if (! in_ino_t_range (st64.st_ino)
  48           || ! in_off_t_range (st64.st_size)
  49           || ! in_blkcnt_t_range (st64.st_blocks))
  50         return INLINE_SYSCALL_ERROR_RETURN_VALUE (EOVERFLOW);
  51
  52       /* Clear internal pad and reserved fields.  */
  53       memset (buf, 0, sizeof (*buf));
  54
  55       buf->st_dev = st64.st_dev,
  56       buf->st_ino = st64.st_ino;
  57       buf->st_mode = st64.st_mode;
  58       buf->st_nlink = st64.st_nlink;
  59       buf->st_uid = st64.st_uid;
  60       buf->st_gid = st64.st_gid;
  61       buf->st_rdev = st64.st_rdev;
  62       buf->st_size = st64.st_size;
  63       buf->st_blksize = st64.st_blksize;
  64       buf->st_blocks  = st64.st_blocks;
  65       buf->st_atim.tv_sec = st64.st_atim.tv_sec;
  66       buf->st_atim.tv_nsec = st64.st_atim.tv_nsec;
  67       buf->st_mtim.tv_sec = st64.st_mtim.tv_sec;
  68       buf->st_mtim.tv_nsec = st64.st_mtim.tv_nsec;
  69       buf->st_ctim.tv_sec = st64.st_ctim.tv_sec;
  70       buf->st_ctim.tv_nsec = st64.st_ctim.tv_nsec;
  71
  72       return 0;
  73     }
  74 #  else
  75   /* 64-bit kabi outlier, e.g. mips64 and mips64-n32.  */
  76   struct kernel_stat kst;
  77   r = INTERNAL_SYSCALL_CALL (newfstatat, fd, file, &kst, flag);
  78   if (r == 0)
  79     r = __cp_kstat_stat (&kst, buf);
  80 #  endif /* __nr_fstatat64  */
  81 # endif /* STAT_IS_KERNEL_STAT  */
  82
  83   return INTERNAL_SYSCALL_ERROR_P (r)
  84          ? INLINE_SYSCALL_ERROR_RETURN_VALUE (-r)
  85          : 0;
  86 }
  87
  88 weak_alias (__fstatat, fstatat)
  89 #endif