sysdeps/unix/sysv/linux/fstat64.c

   1 /* Get file status.  Linux version.
   2    Copyright (C) 2020-2024 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 __fstat __redirect___fstat
  20 #define fstat   __redirect_fstat
  21 #include <sys/stat.h>
  22 #undef __fstat
  23 #undef fstat
  24 #include <fcntl.h>
  25 #include <internal-stat.h>
  26 #include <errno.h>
  27
  28 int
  29 __fstat64_time64 (int fd, struct __stat64_t64 *buf)
  30 {
  31 #if !FSTATAT_USE_STATX
  32 # if XSTAT_IS_XSTAT64
  33   /* The __NR_stat macro is defined for all ABIs that also define
  34      XSTAT_IS_STAT64, so to correctly identify alpha and sparc check
  35      __NR_newfstatat (similar to what fstatat64 does).  */
  36 #  ifdef __NR_newfstatat
  37   /* 64-bit kABI, e.g. aarch64, ia64, powerpc64*, s390x, riscv64, and
  38      x86_64.  */
  39   return INLINE_SYSCALL_CALL (fstat, fd, buf);
  40 #  elif defined __NR_fstat64
  41 #   if STAT64_IS_KERNEL_STAT64
  42   /* 64-bit kABI outlier, e.g. alpha  */
  43   return INLINE_SYSCALL_CALL (fstat64, fd, buf);
  44 #   else
  45   /* 64-bit kABI outlier, e.g. sparc64.  */
  46   struct kernel_stat64 kst64;
  47   int r = INLINE_SYSCALL_CALL (fstat64, fd, &kst64);
  48   if (r == 0)
  49     __cp_stat64_kstat64 (buf, &kst64);
  50   return r;
  51 #   endif /* STAT64_IS_KERNEL_STAT64 */
  52 #  endif
  53 # else /* XSTAT_IS_XSTAT64 */
  54   /* 64-bit kabi outlier, e.g. mips64 and mips64-n32.  */
  55   struct kernel_stat kst;
  56   int r = INLINE_SYSCALL_CALL (fstat, fd, &kst);
  57   if (r == 0)
  58     __cp_kstat_stat64_t64 (&kst, buf);
  59   return r;
  60 # endif
  61 #else /* !FSTATAT_USE_STATX  */
  62   /* All kABIs with non-LFS support and with old 32-bit time_t support
  63      e.g. arm, csky, i386, hppa, m68k, microblaze, nios2, sh, powerpc32,
  64      and sparc32.  */
  65   if (fd < 0)
  66     {
  67       __set_errno (EBADF);
  68       return -1;
  69     }
  70   return __fstatat64_time64 (fd, "", buf, AT_EMPTY_PATH);
  71 #endif
  72 }
  73 #if __TIMESIZE != 64
  74 hidden_def (__fstat64_time64)
  75
  76 int
  77 __fstat64 (int fd, struct stat64 *buf)
  78 {
  79   if (fd < 0)
  80     {
  81       __set_errno (EBADF);
  82       return -1;
  83     }
  84
  85   struct __stat64_t64 st_t64;
  86   return __fstat64_time64 (fd, &st_t64)
  87          ?: __cp_stat64_t64_stat64 (&st_t64, buf);
  88 }
  89 #endif
  90
  91 #undef __fstat
  92 #undef fstat
  93
  94 hidden_def (__fstat64)
  95 weak_alias (__fstat64, fstat64)
  96
  97 #if XSTAT_IS_XSTAT64
  98 strong_alias (__fstat64, __fstat)
  99 weak_alias (__fstat64, fstat)
 100 #endif