sysdeps/unix/sysv/linux/xstatconv.c

   1 /* Convert between the kernel's `struct stat' format, and libc's.
   2    Copyright (C) 1991-2014 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 <sys/stat.h>
  21 #include <kernel_stat.h>
  22 #include <kernel-features.h>
  23
  24 #ifdef STAT_IS_KERNEL_STAT
  25
  26 /* Dummy.  */
  27 struct kernel_stat;
  28
  29 #else
  30
  31 #include <string.h>
  32
  33
  34 #ifdef XSTAT_IS_XSTAT64
  35 int
  36 __xstat_conv (int vers, struct kernel_stat *kbuf, void *ubuf)
  37 {
  38   switch (vers)
  39     {
  40     case _STAT_VER_KERNEL:
  41       /* Nothing to do.  The struct is in the form the kernel expects.
  42          We should have short-circuted before we got here, but for
  43          completeness... */
  44       *(struct kernel_stat *) ubuf = *kbuf;
  45       break;
  46
  47     case _STAT_VER_LINUX:
  48       {
  49         struct stat *buf = ubuf;
  50
  51         /* Convert to current kernel version of `struct stat'.  */
  52         buf->st_dev = kbuf->st_dev;
  53 #ifdef _HAVE_STAT___PAD1
  54         buf->__pad1 = 0;
  55 #endif
  56         buf->st_ino = kbuf->st_ino;
  57         buf->st_mode = kbuf->st_mode;
  58         buf->st_nlink = kbuf->st_nlink;
  59         buf->st_uid = kbuf->st_uid;
  60         buf->st_gid = kbuf->st_gid;
  61         buf->st_rdev = kbuf->st_rdev;
  62 #ifdef _HAVE_STAT___PAD2
  63         buf->__pad2 = 0;
  64 #endif
  65         buf->st_size = kbuf->st_size;
  66         buf->st_blksize = kbuf->st_blksize;
  67         buf->st_blocks = kbuf->st_blocks;
  68 #ifdef _HAVE_STAT_NSEC
  69         buf->st_atim.tv_sec = kbuf->st_atim.tv_sec;
  70         buf->st_atim.tv_nsec = kbuf->st_atim.tv_nsec;
  71         buf->st_mtim.tv_sec = kbuf->st_mtim.tv_sec;
  72         buf->st_mtim.tv_nsec = kbuf->st_mtim.tv_nsec;
  73         buf->st_ctim.tv_sec = kbuf->st_ctim.tv_sec;
  74         buf->st_ctim.tv_nsec = kbuf->st_ctim.tv_nsec;
  75 #else
  76         buf->st_atime = kbuf->st_atime;
  77         buf->st_mtime = kbuf->st_mtime;
  78         buf->st_ctime = kbuf->st_ctime;
  79 #endif
  80 #ifdef _HAVE_STAT___UNUSED1
  81         buf->__glibc_reserved1 = 0;
  82 #endif
  83 #ifdef _HAVE_STAT___UNUSED2
  84         buf->__glibc_reserved2 = 0;
  85 #endif
  86 #ifdef _HAVE_STAT___UNUSED3
  87         buf->__glibc_reserved3 = 0;
  88 #endif
  89 #ifdef _HAVE_STAT___UNUSED4
  90         buf->__glibc_reserved4 = 0;
  91 #endif
  92 #ifdef _HAVE_STAT___UNUSED5
  93         buf->__glibc_reserved5 = 0;
  94 #endif
  95       }
  96       break;
  97
  98     default:
  99       __set_errno (EINVAL);
 100       return -1;
 101     }
 102
 103   return 0;
 104 }
 105 #endif
 106
 107 int
 108 __xstat64_conv (int vers, struct kernel_stat *kbuf, void *ubuf)
 109 {
 110 #ifdef XSTAT_IS_XSTAT64
 111   return __xstat_conv (vers, kbuf, ubuf);
 112 #else
 113   switch (vers)
 114     {
 115     case _STAT_VER_LINUX:
 116       {
 117         struct stat64 *buf = ubuf;
 118
 119         /* Convert to current kernel version of `struct stat64'.  */
 120         buf->st_dev = kbuf->st_dev;
 121 #ifdef _HAVE_STAT64___PAD1
 122         buf->__pad1 = 0;
 123 #endif
 124         buf->st_ino = kbuf->st_ino;
 125 #ifdef _HAVE_STAT64___ST_INO
 126         buf->__st_ino = kbuf->st_ino;
 127 #endif
 128         buf->st_mode = kbuf->st_mode;
 129         buf->st_nlink = kbuf->st_nlink;
 130         buf->st_uid = kbuf->st_uid;
 131         buf->st_gid = kbuf->st_gid;
 132         buf->st_rdev = kbuf->st_rdev;
 133 #ifdef _HAVE_STAT64___PAD2
 134         buf->__pad2 = 0;
 135 #endif
 136         buf->st_size = kbuf->st_size;
 137         buf->st_blksize = kbuf->st_blksize;
 138         buf->st_blocks = kbuf->st_blocks;
 139 #ifdef _HAVE_STAT64_NSEC
 140         buf->st_atim.tv_sec = kbuf->st_atim.tv_sec;
 141         buf->st_atim.tv_nsec = kbuf->st_atim.tv_nsec;
 142         buf->st_mtim.tv_sec = kbuf->st_mtim.tv_sec;
 143         buf->st_mtim.tv_nsec = kbuf->st_mtim.tv_nsec;
 144         buf->st_ctim.tv_sec = kbuf->st_ctim.tv_sec;
 145         buf->st_ctim.tv_nsec = kbuf->st_ctim.tv_nsec;
 146 #else
 147         buf->st_atime = kbuf->st_atime;
 148         buf->st_mtime = kbuf->st_mtime;
 149         buf->st_ctime = kbuf->st_ctime;
 150 #endif
 151 #ifdef _HAVE_STAT64___UNUSED1
 152         buf->__glibc_reserved1 = 0;
 153 #endif
 154 #ifdef _HAVE_STAT64___UNUSED2
 155         buf->__glibc_reserved2 = 0;
 156 #endif
 157 #ifdef _HAVE_STAT64___UNUSED3
 158         buf->__glibc_reserved3 = 0;
 159 #endif
 160 #ifdef _HAVE_STAT64___UNUSED4
 161         buf->__glibc_reserved4 = 0;
 162 #endif
 163 #ifdef _HAVE_STAT64___UNUSED5
 164         buf->__glibc_reserved5 = 0;
 165 #endif
 166       }
 167       break;
 168
 169       /* If struct stat64 is different from struct stat then
 170          _STAT_VER_KERNEL does not make sense.  */
 171     case _STAT_VER_KERNEL:
 172     default:
 173       __set_errno (EINVAL);
 174       return -1;
 175     }
 176
 177   return 0;
 178 #endif
 179 }
 180
 181 int
 182 __xstat32_conv (int vers, struct stat64 *kbuf, struct stat *buf)
 183 {
 184   switch (vers)
 185     {
 186     case _STAT_VER_LINUX:
 187       {
 188         /* Convert current kernel version of `struct stat64' to
 189            `struct stat'.  */
 190         buf->st_dev = kbuf->st_dev;
 191 #ifdef _HAVE_STAT___PAD1
 192         buf->__pad1 = 0;
 193 #endif
 194 #ifdef _HAVE_STAT64___ST_INO
 195 # if __ASSUME_ST_INO_64_BIT == 0
 196         if (kbuf->st_ino == 0)
 197           buf->st_ino = kbuf->__st_ino;
 198         else
 199 # endif
 200           {
 201             buf->st_ino = kbuf->st_ino;
 202             if (sizeof (buf->st_ino) != sizeof (kbuf->st_ino)
 203                 && buf->st_ino != kbuf->st_ino)
 204               {
 205                 __set_errno (EOVERFLOW);
 206                 return -1;
 207               }
 208           }
 209 #else
 210         buf->st_ino = kbuf->st_ino;
 211         if (sizeof (buf->st_ino) != sizeof (kbuf->st_ino)
 212             && buf->st_ino != kbuf->st_ino)
 213           {
 214             __set_errno (EOVERFLOW);
 215             return -1;
 216           }
 217 #endif
 218         buf->st_mode = kbuf->st_mode;
 219         buf->st_nlink = kbuf->st_nlink;
 220         buf->st_uid = kbuf->st_uid;
 221         buf->st_gid = kbuf->st_gid;
 222         buf->st_rdev = kbuf->st_rdev;
 223 #ifdef _HAVE_STAT___PAD2
 224         buf->__pad2 = 0;
 225 #endif
 226         buf->st_size = kbuf->st_size;
 227         /* Check for overflow.  */
 228         if (sizeof (buf->st_size) != sizeof (kbuf->st_size)
 229             && buf->st_size != kbuf->st_size)
 230           {
 231             __set_errno (EOVERFLOW);
 232             return -1;
 233           }
 234         buf->st_blksize = kbuf->st_blksize;
 235         buf->st_blocks = kbuf->st_blocks;
 236         /* Check for overflow.  */
 237         if (sizeof (buf->st_blocks) != sizeof (kbuf->st_blocks)
 238             && buf->st_blocks != kbuf->st_blocks)
 239           {
 240             __set_errno (EOVERFLOW);
 241             return -1;
 242           }
 243 #ifdef _HAVE_STAT_NSEC
 244         buf->st_atim.tv_sec = kbuf->st_atim.tv_sec;
 245         buf->st_atim.tv_nsec = kbuf->st_atim.tv_nsec;
 246         buf->st_mtim.tv_sec = kbuf->st_mtim.tv_sec;
 247         buf->st_mtim.tv_nsec = kbuf->st_mtim.tv_nsec;
 248         buf->st_ctim.tv_sec = kbuf->st_ctim.tv_sec;
 249         buf->st_ctim.tv_nsec = kbuf->st_ctim.tv_nsec;
 250 #else
 251         buf->st_atime = kbuf->st_atime;
 252         buf->st_mtime = kbuf->st_mtime;
 253         buf->st_ctime = kbuf->st_ctime;
 254 #endif
 255
 256 #ifdef _HAVE_STAT___UNUSED1
 257         buf->__glibc_reserved1 = 0;
 258 #endif
 259 #ifdef _HAVE_STAT___UNUSED2
 260         buf->__glibc_reserved2 = 0;
 261 #endif
 262 #ifdef _HAVE_STAT___UNUSED3
 263         buf->__glibc_reserved3 = 0;
 264 #endif
 265 #ifdef _HAVE_STAT___UNUSED4
 266         buf->__glibc_reserved4 = 0;
 267 #endif
 268 #ifdef _HAVE_STAT___UNUSED5
 269         buf->__glibc_reserved5 = 0;
 270 #endif
 271       }
 272       break;
 273
 274       /* If struct stat64 is different from struct stat then
 275          _STAT_VER_KERNEL does not make sense.  */
 276     case _STAT_VER_KERNEL:
 277     default:
 278       __set_errno (EINVAL);
 279       return -1;
 280     }
 281
 282   return 0;
 283 }
 284
 285 #endif