sysdeps/unix/sysv/linux/fstatvfs64.c

   1 /* Return information about the filesystem on which FD resides.
   2    Copyright (C) 1996-2021 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 #include <errno.h>
  20 #include <string.h>
  21 #include <sys/stat.h>
  22 #include <sys/statfs.h>
  23 #include "internal_statvfs.h"
  24 #include <kernel-features.h>
  25
  26 /* Return information about the filesystem on which FD resides.  */
  27 int
  28 __fstatvfs64 (int fd, struct statvfs64 *buf)
  29 {
  30   struct statfs64 fsbuf;
  31   int res = __fstatfs64 (fd, &fsbuf);
  32
  33 #ifndef __ASSUME_STATFS64
  34   if (res < 0 && errno == ENOSYS)
  35     {
  36       struct statvfs buf32;
  37
  38       res = fstatvfs (fd, &buf32);
  39       if (res == 0)
  40         {
  41           buf->f_bsize = buf32.f_bsize;
  42           buf->f_frsize = buf32.f_frsize;
  43           buf->f_blocks = buf32.f_blocks;
  44           buf->f_bfree = buf32.f_bfree;
  45           buf->f_bavail = buf32.f_bavail;
  46           buf->f_files = buf32.f_files;
  47           buf->f_ffree = buf32.f_ffree;
  48           buf->f_favail = buf32.f_favail;
  49           buf->f_fsid = buf32.f_fsid;
  50           buf->f_flag = buf32.f_flag;
  51           buf->f_namemax = buf32.f_namemax;
  52           memcpy (buf->__f_spare, buf32.__f_spare, sizeof (buf32.__f_spare));
  53         }
  54     }
  55 #endif
  56
  57   if (res == 0)
  58     /* Convert the result.  */
  59     __internal_statvfs64 (NULL, buf, &fsbuf, fd);
  60
  61   return res;
  62 }
  63 weak_alias (__fstatvfs64, fstatvfs64)