sysdeps/unix/sysv/linux/fstatvfs64.c

   1 /* Return information about the filesystem on which FD resides.
   2    Copyright (C) 1996-2015 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <string.h>
  21 #include <sys/stat.h>
  22 #include <sys/statfs.h>
  23 #include <sys/statvfs.h>
  24 #include <kernel-features.h>
  25
  26
  27 extern void __internal_statvfs64 (const char *name, struct statvfs64 *buf,
  28                                   struct statfs64 *fsbuf, int fd);
  29
  30
  31 /* Return information about the filesystem on which FD resides.  */
  32 int
  33 __fstatvfs64 (int fd, struct statvfs64 *buf)
  34 {
  35   struct statfs64 fsbuf;
  36   int res = __fstatfs64 (fd, &fsbuf);
  37
  38 #ifndef __ASSUME_STATFS64
  39   if (res < 0 && errno == ENOSYS)
  40     {
  41       struct statvfs buf32;
  42
  43       res = fstatvfs (fd, &buf32);
  44       if (res == 0)
  45         {
  46           buf->f_bsize = buf32.f_bsize;
  47           buf->f_frsize = buf32.f_frsize;
  48           buf->f_blocks = buf32.f_blocks;
  49           buf->f_bfree = buf32.f_bfree;
  50           buf->f_bavail = buf32.f_bavail;
  51           buf->f_files = buf32.f_files;
  52           buf->f_ffree = buf32.f_ffree;
  53           buf->f_favail = buf32.f_favail;
  54           buf->f_fsid = buf32.f_fsid;
  55           buf->f_flag = buf32.f_flag;
  56           buf->f_namemax = buf32.f_namemax;
  57           memcpy (buf->__f_spare, buf32.__f_spare, sizeof (buf32.__f_spare));
  58         }
  59     }
  60 #endif
  61
  62   if (res == 0)
  63     /* Convert the result.  */
  64     __internal_statvfs64 (NULL, buf, &fsbuf, fd);
  65
  66   return res;
  67 }
  68 weak_alias (__fstatvfs64, fstatvfs64)