sysdeps/unix/sysv/linux/fstatfs64.c

   1 /* Return information about the filesystem on which FD resides.
   2    Copyright (C) 1996-2017 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 <stddef.h>
  22 #include <sysdep.h>
  23 #include <kernel_stat.h>
  24
  25 /* Hide the prototypes for __fstatfs and fstatfs so that GCC will not
  26    complain about the different function signatures if they are aliased
  27    to  __fstat64.  If STATFS_IS_STATFS64 is not zero then the statfs and
  28    statfs64 structures have an identical layout but different type names.  */
  29
  30 #if STATFS_IS_STATFS64
  31 # define __fstatfs __fstatfs_disable
  32 # define fstatfs fstatfs_disable
  33 #endif
  34 #include <sys/statfs.h>
  35
  36 #include <kernel-features.h>
  37
  38 /* Defined in statfs64.c.  */
  39 extern int __no_statfs64 attribute_hidden;
  40
  41 /* Return information about the filesystem on which FD resides.  */
  42 int
  43 __fstatfs64 (int fd, struct statfs64 *buf)
  44 {
  45 #ifdef __NR_fstatfs64
  46 # if __ASSUME_STATFS64 == 0
  47   if (! __no_statfs64)
  48 # endif
  49     {
  50       int result = INLINE_SYSCALL (fstatfs64, 3, fd, sizeof (*buf), buf);
  51
  52 # if __ASSUME_STATFS64 == 0
  53       if (result == 0 || errno != ENOSYS)
  54 # endif
  55         return result;
  56
  57 # if __ASSUME_STATFS64 == 0
  58       __no_statfs64 = 1;
  59 # endif
  60     }
  61 #endif
  62
  63 #if __ASSUME_STATFS64 == 0
  64   struct statfs buf32;
  65
  66   if (__fstatfs (fd, &buf32) < 0)
  67     return -1;
  68
  69   buf->f_type = buf32.f_type;
  70   buf->f_bsize = buf32.f_bsize;
  71   buf->f_blocks = buf32.f_blocks;
  72   buf->f_bfree = buf32.f_bfree;
  73   buf->f_bavail = buf32.f_bavail;
  74   buf->f_files = buf32.f_files;
  75   buf->f_ffree = buf32.f_ffree;
  76   buf->f_fsid = buf32.f_fsid;
  77   buf->f_namelen = buf32.f_namelen;
  78   buf->f_frsize = buf32.f_frsize;
  79   memcpy (buf->f_spare, buf32.f_spare, sizeof (buf32.f_spare));
  80
  81   return 0;
  82 #endif
  83 }
  84 weak_alias (__fstatfs64, fstatfs64)
  85
  86 #undef __fstatfs
  87 #undef fstatfs
  88
  89 #if STATFS_IS_STATFS64
  90 weak_alias (__fstatfs64, __fstatfs)
  91 weak_alias (__fstatfs64, fstatfs)
  92 #endif