sysdeps/unix/sysv/linux/fstatat64.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 #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 <statx_cp.h>
  28 #include <kstat_cp.h>
  29 #include <stat_t64_cp.h>
  30
  31 int
  32 __fstatat64_time64 (int fd, const char *file, struct __stat64_t64 *buf,
  33                     int flag)
  34 {
  35   int r;
  36
  37 #if (__WORDSIZE == 32 \
  38      && (!defined __SYSCALL_WORDSIZE || __SYSCALL_WORDSIZE == 32))
  39   /* 32-bit kABI with default 64-bit time_t, e.g. arc, riscv32.   Also
  40      64-bit time_t support is done through statx syscall.  */
  41   struct statx tmp;
  42   r = INTERNAL_SYSCALL_CALL (statx, fd, file, AT_NO_AUTOMOUNT | flag,
  43                              STATX_BASIC_STATS, &tmp);
  44   if (r == 0)
  45     {
  46       __cp_stat64_t64_statx (buf, &tmp);
  47       return 0;
  48     }
  49   if (-r != ENOSYS)
  50     return INLINE_SYSCALL_ERROR_RETURN_VALUE (-r);
  51 #endif
  52
  53 #if XSTAT_IS_XSTAT64
  54 # ifdef __NR_newfstatat
  55   /* 64-bit kABI, e.g. aarch64, ia64, powerpc64*, s390x, riscv64, and
  56      x86_64.  */
  57   r = INTERNAL_SYSCALL_CALL (newfstatat, fd, file, buf, flag);
  58 # elif defined __NR_fstatat64
  59 #  if STAT64_IS_KERNEL_STAT64
  60   /* 64-bit kABI outlier, e.g. alpha  */
  61   r = INTERNAL_SYSCALL_CALL (fstatat64, fd, file, buf, flag);
  62 #  else
  63   /* 64-bit kABI outlier, e.g. sparc64.  */
  64   struct kernel_stat64 kst64;
  65   r = INTERNAL_SYSCALL_CALL (fstatat64, fd, file, &kst64, flag);
  66   if (r == 0)
  67     __cp_stat64_kstat64 (buf, &kst64);
  68 #  endif
  69 # endif
  70 #else
  71 # ifdef __NR_fstatat64
  72   /* All kABIs with non-LFS support and with old 32-bit time_t support
  73      e.g. arm, csky, i386, hppa, m68k, microblaze, nios2, sh, powerpc32,
  74      and sparc32.  */
  75   struct stat64 st64;
  76   r = INTERNAL_SYSCALL_CALL (fstatat64, fd, file, &st64, flag);
  77   if (r == 0)
  78     {
  79       /* Clear both pad and reserved fields.  */
  80       memset (buf, 0, sizeof (*buf));
  81
  82       buf->st_dev = st64.st_dev,
  83       buf->st_ino = st64.st_ino;
  84       buf->st_mode = st64.st_mode;
  85       buf->st_nlink = st64.st_nlink;
  86       buf->st_uid = st64.st_uid;
  87       buf->st_gid = st64.st_gid;
  88       buf->st_rdev = st64.st_rdev;
  89       buf->st_size = st64.st_size;
  90       buf->st_blksize = st64.st_blksize;
  91       buf->st_blocks  = st64.st_blocks;
  92       buf->st_atim = valid_timespec_to_timespec64 (st64.st_atim);
  93       buf->st_mtim = valid_timespec_to_timespec64 (st64.st_mtim);
  94       buf->st_ctim = valid_timespec_to_timespec64 (st64.st_ctim);
  95     }
  96 # else
  97   /* 64-bit kabi outlier, e.g. mips64 and mips64-n32.  */
  98   struct kernel_stat kst;
  99   r = INTERNAL_SYSCALL_CALL (newfstatat, fd, file, &kst, flag);
 100   if (r == 0)
 101     __cp_kstat_stat64_t64 (&kst, buf);
 102 # endif
 103 #endif
 104
 105   return INTERNAL_SYSCALL_ERROR_P (r)
 106          ? INLINE_SYSCALL_ERROR_RETURN_VALUE (-r)
 107          : 0;
 108 }
 109 #if __TIMESIZE != 64
 110 hidden_def (__fstatat64_time64)
 111
 112 int
 113 __fstatat64 (int fd, const char *file, struct stat64 *buf, int flags)
 114 {
 115   struct __stat64_t64 st_t64;
 116   return __fstatat64_time64 (fd, file, &st_t64, flags)
 117          ?: __cp_stat64_t64_stat64 (&st_t64, buf);
 118 }
 119 #endif
 120
 121 #undef __fstatat
 122 #undef fstatat
 123
 124 hidden_def (__fstatat64)
 125 weak_alias (__fstatat64, fstatat64)
 126
 127 #if XSTAT_IS_XSTAT64
 128 strong_alias (__fstatat64, __fstatat)
 129 weak_alias (__fstatat64, fstatat)
 130 strong_alias (__fstatat64, __GI___fstatat);
 131 #endif