sysdeps/unix/sysv/linux/fxstatat.c

   1 /* Copyright (C) 2005-2017 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 /* Ho hum, if fxstatat == fxstatat64 we must get rid of the prototype or gcc
  19    will complain since they don't strictly match.  */
  20 #define __fxstatat64 __fxstatat64_disable
  21
  22 #include <errno.h>
  23 #include <fcntl.h>
  24 #include <stddef.h>
  25 #include <stdio.h>
  26 #include <string.h>
  27 #include <sys/stat.h>
  28 #include <kernel_stat.h>
  29
  30 #include <sysdep.h>
  31 #include <sys/syscall.h>
  32
  33 #include <xstatconv.h>
  34
  35 /* Get information about the file NAME in BUF.  */
  36 int
  37 __fxstatat (int vers, int fd, const char *file, struct stat *st, int flag)
  38 {
  39   int result;
  40   INTERNAL_SYSCALL_DECL (err);
  41 #ifdef STAT_IS_KERNEL_STAT
  42 # define kst (*st)
  43 #else
  44   struct kernel_stat kst;
  45 #endif
  46
  47   result = INTERNAL_SYSCALL (newfstatat, err, 4, fd, file, &kst, flag);
  48   if (!__builtin_expect (INTERNAL_SYSCALL_ERROR_P (result, err), 1))
  49     {
  50 #ifdef STAT_IS_KERNEL_STAT
  51       return 0;
  52 #else
  53       return __xstat_conv (vers, &kst, st);
  54 #endif
  55     }
  56   else
  57     return INLINE_SYSCALL_ERROR_RETURN_VALUE (INTERNAL_SYSCALL_ERRNO (result,
  58                                                                       err));
  59 }
  60 libc_hidden_def (__fxstatat)
  61 #if XSTAT_IS_XSTAT64
  62 # undef __fxstatat64
  63 strong_alias (__fxstatat, __fxstatat64);
  64 libc_hidden_def (__fxstatat64)
  65 #endif