sysdeps/unix/sysv/linux/i386/fxstat.c

   1 /* fxstat using old-style Unix fstat system call.
   2    Copyright (C) 1991,1995-1998,2000,2002,2003 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 /* Ho hum, if xstat == xstat64 we must get rid of the prototype or gcc
  21    will complain since they don't strictly match.  */
  22 #define __fxstat64 __fxstat64_disable
  23
  24 #include <errno.h>
  25 #include <stddef.h>
  26 #include <sys/stat.h>
  27 #include <kernel_stat.h>
  28
  29 #include <sysdep.h>
  30 #include <sys/syscall.h>
  31 #include <bp-checks.h>
  32
  33 #include "kernel-features.h"
  34
  35 #include <xstatconv.h>
  36
  37 #ifdef __NR_stat64
  38 # if  __ASSUME_STAT64_SYSCALL == 0
  39 /* The variable is shared between all wrappers around *stat64 calls.  */
  40 extern int __have_no_stat64;
  41 # endif
  42 #endif
  43
  44 /* Get information about the file FD in BUF.  */
  45 int
  46 __fxstat (int vers, int fd, struct stat *buf)
  47 {
  48 #if __ASSUME_STAT64_SYSCALL == 0
  49   struct kernel_stat kbuf;
  50 #endif
  51   int result;
  52
  53   if (vers == _STAT_VER_KERNEL)
  54     return INLINE_SYSCALL (fstat, 2, fd, CHECK_1 ((struct kernel_stat *) buf));
  55
  56 #if __ASSUME_STAT64_SYSCALL > 0
  57   {
  58     struct stat64 buf64;
  59
  60     result = INLINE_SYSCALL (fstat64, 2, fd, __ptrvalue (&buf64));
  61     if (result == 0)
  62       result = __xstat32_conv (vers, &buf64, buf);
  63     return result;
  64   }
  65 #else
  66
  67 # if defined __NR_stat64
  68   /* To support 32 bit UIDs, we have to use stat64.  The normal stat call only returns
  69      16 bit UIDs.  */
  70   if (! __have_no_stat64)
  71     {
  72       struct stat64 buf64;
  73
  74       result = INLINE_SYSCALL (fstat64, 2, fd, __ptrvalue (&buf64));
  75
  76       if (result == 0)
  77         result = __xstat32_conv (vers, &buf64, buf);
  78
  79       if (result != -1 || errno != ENOSYS)
  80         return result;
  81
  82       __have_no_stat64 = 1;
  83     }
  84 # endif
  85
  86   result = INLINE_SYSCALL (fstat, 2, fd, __ptrvalue (&kbuf));
  87   if (result == 0)
  88     result = __xstat_conv (vers, &kbuf, buf);
  89
  90   return result;
  91 #endif  /* __ASSUME_STAT64_SYSCALL  */
  92 }
  93
  94 hidden_def (__fxstat)
  95 weak_alias (__fxstat, _fxstat);
  96 #ifdef XSTAT_IS_XSTAT64
  97 #undef __fxstat64
  98 strong_alias (__fxstat, __fxstat64);
  99 hidden_ver (__fxstat, __fxstat64)
 100 #endif