sysdeps/unix/sysv/linux/statfs64.c

   1 /* Return information about the filesystem on which FILE 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 __statfs and statfs so that GCC will not
  26    complain about the different function signatures if they are aliased
  27    to  __stat64.  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 __statfs __statfs_disable
  32 # define statfs statfs_disable
  33 #endif
  34 #include <sys/statfs.h>
  35
  36 #include <kernel-features.h>
  37
  38
  39 # if __ASSUME_STATFS64 == 0
  40 int __no_statfs64 attribute_hidden;
  41 #endif
  42
  43 /* Return information about the filesystem on which FILE resides.  */
  44 int
  45 __statfs64 (const char *file, struct statfs64 *buf)
  46 {
  47 #ifdef __NR_statfs64
  48 # if __ASSUME_STATFS64 == 0
  49   if (! __no_statfs64)
  50 # endif
  51     {
  52       int result = INLINE_SYSCALL (statfs64, 3, file, sizeof (*buf), buf);
  53
  54 # if __ASSUME_STATFS64 == 0
  55       if (result == 0 || errno != ENOSYS)
  56 # endif
  57         return result;
  58
  59 # if __ASSUME_STATFS64 == 0
  60       __no_statfs64 = 1;
  61 # endif
  62     }
  63 #endif
  64
  65 #if __ASSUME_STATFS64 == 0
  66   struct statfs buf32;
  67
  68   if (__statfs (file, &buf32) < 0)
  69     return -1;
  70
  71   buf->f_type = buf32.f_type;
  72   buf->f_bsize = buf32.f_bsize;
  73   buf->f_blocks = buf32.f_blocks;
  74   buf->f_bfree = buf32.f_bfree;
  75   buf->f_bavail = buf32.f_bavail;
  76   buf->f_files = buf32.f_files;
  77   buf->f_ffree = buf32.f_ffree;
  78   buf->f_fsid = buf32.f_fsid;
  79   buf->f_namelen = buf32.f_namelen;
  80   buf->f_frsize = buf32.f_frsize;
  81   memcpy (buf->f_spare, buf32.f_spare, sizeof (buf32.f_spare));
  82
  83   return 0;
  84 #endif
  85 }
  86 weak_alias (__statfs64, statfs64)
  87
  88 #undef __statfs
  89 #undef statfs
  90
  91 #if STATFS_IS_STATFS64
  92 weak_alias (__statfs64, __statfs)
  93 weak_alias (__statfs64, statfs)
  94 libc_hidden_ver (__statfs64, __statfs)
  95 #endif