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glibc  2.9
fxstat64.c
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00001 /* fxstat64 using old-style Unix fstat system call.
00002    Copyright (C) 1997-2002, 2003, 2006 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <errno.h>
00021 #include <stddef.h>
00022 #include <sys/stat.h>
00023 #include <kernel_stat.h>
00024 
00025 #include <sysdep.h>
00026 #include <sys/syscall.h>
00027 #include <bp-checks.h>
00028 
00029 #include <kernel-features.h>
00030 
00031 #if __ASSUME_STAT64_SYSCALL == 0
00032 # include <xstatconv.h>
00033 #endif
00034 
00035 #ifdef __NR_fstat64
00036 # if  __ASSUME_STAT64_SYSCALL == 0
00037 /* The variable is shared between all wrappers around *stat64 calls.  */
00038 extern int __have_no_stat64;
00039 # endif
00040 #endif
00041 
00042 /* Get information about the file FD in BUF.  */
00043 
00044 int
00045 ___fxstat64 (int vers, int fd, struct stat64 *buf)
00046 {
00047   int result;
00048 #if __ASSUME_STAT64_SYSCALL > 0
00049   result = INLINE_SYSCALL (fstat64, 2, fd, CHECK_1 (buf));
00050 # if defined _HAVE_STAT64___ST_INO && __ASSUME_ST_INO_64_BIT == 0
00051   if (__builtin_expect (!result, 1) && buf->__st_ino != (__ino_t) buf->st_ino)
00052     buf->st_ino = buf->__st_ino;
00053 # endif
00054   return result;
00055 #else
00056   struct kernel_stat kbuf;
00057 # if defined __NR_fstat64
00058   if (! __have_no_stat64)
00059     {
00060       int saved_errno = errno;
00061       result = INLINE_SYSCALL (fstat64, 2, fd, CHECK_1 (buf));
00062 
00063       if (result != -1 || errno != ENOSYS)
00064        {
00065 #  if defined _HAVE_STAT64___ST_INO && __ASSUME_ST_INO_64_BIT == 0
00066          if (!result && buf->__st_ino != (__ino_t)buf->st_ino)
00067            buf->st_ino = buf->__st_ino;
00068 #  endif
00069          return result;
00070        }
00071 
00072       __set_errno (saved_errno);
00073       __have_no_stat64 = 1;
00074     }
00075 # endif
00076   result = INLINE_SYSCALL (fstat, 2, fd, __ptrvalue (&kbuf));
00077   if (result == 0)
00078     result = __xstat64_conv (vers, &kbuf, buf);
00079 
00080   return result;
00081 #endif
00082 }
00083 
00084 #include <shlib-compat.h>
00085 
00086 #if SHLIB_COMPAT(libc, GLIBC_2_1, GLIBC_2_2)
00087 versioned_symbol (libc, ___fxstat64, __fxstat64, GLIBC_2_2);
00088 strong_alias (___fxstat64, __old__fxstat64)
00089 compat_symbol (libc, __old__fxstat64, __fxstat64, GLIBC_2_1);
00090 hidden_ver (___fxstat64, __fxstat64)
00091 #else
00092 strong_alias (___fxstat64, __fxstat64)
00093 hidden_def (__fxstat64)
00094 #endif