sysdeps/unix/sysv/linux/xstatconv.c

   1 /* Convert between the kernel's `struct stat' format, and libc's.
   2    Copyright (C) 1991-2018 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 #if 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       return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
 100     }
 101
 102   return 0;
 103 }
 104 #endif
 105
 106 int
 107 __xstat64_conv (int vers, struct kernel_stat *kbuf, void *ubuf)
 108 {
 109 #if XSTAT_IS_XSTAT64
 110   return __xstat_conv (vers, kbuf, ubuf);
 111 #else
 112   switch (vers)
 113     {
 114     case _STAT_VER_LINUX:
 115       {
 116         struct stat64 *buf = ubuf;
 117
 118         /* Convert to current kernel version of `struct stat64'.  */
 119         buf->st_dev = kbuf->st_dev;
 120 #ifdef _HAVE_STAT64___PAD1
 121         buf->__pad1 = 0;
 122 #endif
 123         buf->st_ino = kbuf->st_ino;
 124 #ifdef _HAVE_STAT64___ST_INO
 125         buf->__st_ino = kbuf->st_ino;
 126 #endif
 127         buf->st_mode = kbuf->st_mode;
 128         buf->st_nlink = kbuf->st_nlink;
 129         buf->st_uid = kbuf->st_uid;
 130         buf->st_gid = kbuf->st_gid;
 131         buf->st_rdev = kbuf->st_rdev;
 132 #ifdef _HAVE_STAT64___PAD2
 133         buf->__pad2 = 0;
 134 #endif
 135         buf->st_size = kbuf->st_size;
 136         buf->st_blksize = kbuf->st_blksize;
 137         buf->st_blocks = kbuf->st_blocks;
 138 #ifdef _HAVE_STAT64_NSEC
 139         buf->st_atim.tv_sec = kbuf->st_atim.tv_sec;
 140         buf->st_atim.tv_nsec = kbuf->st_atim.tv_nsec;
 141         buf->st_mtim.tv_sec = kbuf->st_mtim.tv_sec;
 142         buf->st_mtim.tv_nsec = kbuf->st_mtim.tv_nsec;
 143         buf->st_ctim.tv_sec = kbuf->st_ctim.tv_sec;
 144         buf->st_ctim.tv_nsec = kbuf->st_ctim.tv_nsec;
 145 #else
 146         buf->st_atime = kbuf->st_atime;
 147         buf->st_mtime = kbuf->st_mtime;
 148         buf->st_ctime = kbuf->st_ctime;
 149 #endif
 150 #ifdef _HAVE_STAT64___UNUSED1
 151         buf->__glibc_reserved1 = 0;
 152 #endif
 153 #ifdef _HAVE_STAT64___UNUSED2
 154         buf->__glibc_reserved2 = 0;
 155 #endif
 156 #ifdef _HAVE_STAT64___UNUSED3
 157         buf->__glibc_reserved3 = 0;
 158 #endif
 159 #ifdef _HAVE_STAT64___UNUSED4
 160         buf->__glibc_reserved4 = 0;
 161 #endif
 162 #ifdef _HAVE_STAT64___UNUSED5
 163         buf->__glibc_reserved5 = 0;
 164 #endif
 165       }
 166       break;
 167
 168       /* If struct stat64 is different from struct stat then
 169          _STAT_VER_KERNEL does not make sense.  */
 170     case _STAT_VER_KERNEL:
 171     default:
 172       return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
 173     }
 174
 175   return 0;
 176 #endif
 177 }
 178
 179 int
 180 __xstat32_conv (int vers, struct stat64 *kbuf, struct stat *buf)
 181 {
 182   switch (vers)
 183     {
 184     case _STAT_VER_LINUX:
 185       {
 186         /* Convert current kernel version of `struct stat64' to
 187            `struct stat'.  */
 188         buf->st_dev = kbuf->st_dev;
 189 #ifdef _HAVE_STAT___PAD1
 190         buf->__pad1 = 0;
 191 #endif
 192 #ifdef _HAVE_STAT64___ST_INO
 193 # if !__ASSUME_ST_INO_64_BIT
 194         if (kbuf->st_ino == 0)
 195           buf->st_ino = kbuf->__st_ino;
 196         else
 197 # endif
 198           {
 199             buf->st_ino = kbuf->st_ino;
 200             if (sizeof (buf->st_ino) != sizeof (kbuf->st_ino)
 201                 && buf->st_ino != kbuf->st_ino)
 202               return INLINE_SYSCALL_ERROR_RETURN_VALUE (EOVERFLOW);
 203           }
 204 #else
 205         buf->st_ino = kbuf->st_ino;
 206         if (sizeof (buf->st_ino) != sizeof (kbuf->st_ino)
 207             && buf->st_ino != kbuf->st_ino)
 208           return INLINE_SYSCALL_ERROR_RETURN_VALUE (EOVERFLOW);
 209 #endif
 210         buf->st_mode = kbuf->st_mode;
 211         buf->st_nlink = kbuf->st_nlink;
 212         buf->st_uid = kbuf->st_uid;
 213         buf->st_gid = kbuf->st_gid;
 214         buf->st_rdev = kbuf->st_rdev;
 215 #ifdef _HAVE_STAT___PAD2
 216         buf->__pad2 = 0;
 217 #endif
 218         buf->st_size = kbuf->st_size;
 219         /* Check for overflow.  */
 220         if (sizeof (buf->st_size) != sizeof (kbuf->st_size)
 221             && buf->st_size != kbuf->st_size)
 222           return INLINE_SYSCALL_ERROR_RETURN_VALUE (EOVERFLOW);
 223         buf->st_blksize = kbuf->st_blksize;
 224         buf->st_blocks = kbuf->st_blocks;
 225         /* Check for overflow.  */
 226         if (sizeof (buf->st_blocks) != sizeof (kbuf->st_blocks)
 227             && buf->st_blocks != kbuf->st_blocks)
 228           return INLINE_SYSCALL_ERROR_RETURN_VALUE (EOVERFLOW);
 229 #ifdef _HAVE_STAT_NSEC
 230         buf->st_atim.tv_sec = kbuf->st_atim.tv_sec;
 231         buf->st_atim.tv_nsec = kbuf->st_atim.tv_nsec;
 232         buf->st_mtim.tv_sec = kbuf->st_mtim.tv_sec;
 233         buf->st_mtim.tv_nsec = kbuf->st_mtim.tv_nsec;
 234         buf->st_ctim.tv_sec = kbuf->st_ctim.tv_sec;
 235         buf->st_ctim.tv_nsec = kbuf->st_ctim.tv_nsec;
 236 #else
 237         buf->st_atime = kbuf->st_atime;
 238         buf->st_mtime = kbuf->st_mtime;
 239         buf->st_ctime = kbuf->st_ctime;
 240 #endif
 241
 242 #ifdef _HAVE_STAT___UNUSED1
 243         buf->__glibc_reserved1 = 0;
 244 #endif
 245 #ifdef _HAVE_STAT___UNUSED2
 246         buf->__glibc_reserved2 = 0;
 247 #endif
 248 #ifdef _HAVE_STAT___UNUSED3
 249         buf->__glibc_reserved3 = 0;
 250 #endif
 251 #ifdef _HAVE_STAT___UNUSED4
 252         buf->__glibc_reserved4 = 0;
 253 #endif
 254 #ifdef _HAVE_STAT___UNUSED5
 255         buf->__glibc_reserved5 = 0;
 256 #endif
 257       }
 258       break;
 259
 260       /* If struct stat64 is different from struct stat then
 261          _STAT_VER_KERNEL does not make sense.  */
 262     case _STAT_VER_KERNEL:
 263     default:
 264       return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
 265     }
 266
 267   return 0;
 268 }
 269
 270 #endif