sysdeps/unix/sysv/linux/xstatconv.c

   1 /* Convert between the kernel's `struct stat' format, and libc's.
   2    Copyright (C) 1991-2024 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 <sys/stat.h>
  21 #include <kernel_stat.h>
  22 #include <sysdep.h>
  23
  24 #if !STAT_IS_KERNEL_STAT
  25
  26 #include <string.h>
  27
  28
  29 #if XSTAT_IS_XSTAT64
  30 int
  31 __xstat_conv (int vers, struct kernel_stat *kbuf, void *ubuf)
  32 {
  33   switch (vers)
  34     {
  35     case _STAT_VER_KERNEL:
  36       /* Nothing to do.  The struct is in the form the kernel expects.
  37          We should have short-circuted before we got here, but for
  38          completeness... */
  39       *(struct kernel_stat *) ubuf = *kbuf;
  40       break;
  41
  42     case _STAT_VER_LINUX:
  43       {
  44         struct stat *buf = ubuf;
  45
  46         /* Convert to current kernel version of `struct stat'.  */
  47         buf->st_dev = kbuf->st_dev;
  48 #ifdef _HAVE_STAT___PAD1
  49         buf->__pad1 = 0;
  50 #endif
  51         buf->st_ino = kbuf->st_ino;
  52         buf->st_mode = kbuf->st_mode;
  53         buf->st_nlink = kbuf->st_nlink;
  54         buf->st_uid = kbuf->st_uid;
  55         buf->st_gid = kbuf->st_gid;
  56         buf->st_rdev = kbuf->st_rdev;
  57 #ifdef _HAVE_STAT___PAD2
  58         buf->__pad2 = 0;
  59 #endif
  60         buf->st_size = kbuf->st_size;
  61         buf->st_blksize = kbuf->st_blksize;
  62         buf->st_blocks = kbuf->st_blocks;
  63 #ifdef _HAVE_STAT_NSEC
  64         buf->st_atim.tv_sec = kbuf->st_atim.tv_sec;
  65         buf->st_atim.tv_nsec = kbuf->st_atim.tv_nsec;
  66         buf->st_mtim.tv_sec = kbuf->st_mtim.tv_sec;
  67         buf->st_mtim.tv_nsec = kbuf->st_mtim.tv_nsec;
  68         buf->st_ctim.tv_sec = kbuf->st_ctim.tv_sec;
  69         buf->st_ctim.tv_nsec = kbuf->st_ctim.tv_nsec;
  70 #else
  71         buf->st_atime = kbuf->st_atime;
  72         buf->st_mtime = kbuf->st_mtime;
  73         buf->st_ctime = kbuf->st_ctime;
  74 #endif
  75 #ifdef _HAVE_STAT___UNUSED1
  76         buf->__glibc_reserved1 = 0;
  77 #endif
  78 #ifdef _HAVE_STAT___UNUSED2
  79         buf->__glibc_reserved2 = 0;
  80 #endif
  81 #ifdef _HAVE_STAT___UNUSED3
  82         buf->__glibc_reserved3 = 0;
  83 #endif
  84 #ifdef _HAVE_STAT___UNUSED4
  85         buf->__glibc_reserved4 = 0;
  86 #endif
  87 #ifdef _HAVE_STAT___UNUSED5
  88         buf->__glibc_reserved5 = 0;
  89 #endif
  90       }
  91       break;
  92
  93     default:
  94       return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
  95     }
  96
  97   return 0;
  98 }
  99 #endif
 100
 101 int
 102 __xstat64_conv (int vers, struct kernel_stat *kbuf, void *ubuf)
 103 {
 104 #if XSTAT_IS_XSTAT64
 105   return __xstat_conv (vers, kbuf, ubuf);
 106 #else
 107   switch (vers)
 108     {
 109     case _STAT_VER_LINUX:
 110       {
 111         struct stat64 *buf = ubuf;
 112
 113         /* Convert to current kernel version of `struct stat64'.  */
 114         buf->st_dev = kbuf->st_dev;
 115 #ifdef _HAVE_STAT64___PAD1
 116         buf->__pad1 = 0;
 117 #endif
 118         buf->st_ino = kbuf->st_ino;
 119 #ifdef _HAVE_STAT64___ST_INO
 120         buf->__st_ino = kbuf->st_ino;
 121 #endif
 122         buf->st_mode = kbuf->st_mode;
 123         buf->st_nlink = kbuf->st_nlink;
 124         buf->st_uid = kbuf->st_uid;
 125         buf->st_gid = kbuf->st_gid;
 126         buf->st_rdev = kbuf->st_rdev;
 127 #ifdef _HAVE_STAT64___PAD2
 128         buf->__pad2 = 0;
 129 #endif
 130         buf->st_size = kbuf->st_size;
 131         buf->st_blksize = kbuf->st_blksize;
 132         buf->st_blocks = kbuf->st_blocks;
 133 #ifdef _HAVE_STAT64_NSEC
 134         buf->st_atim.tv_sec = kbuf->st_atim.tv_sec;
 135         buf->st_atim.tv_nsec = kbuf->st_atim.tv_nsec;
 136         buf->st_mtim.tv_sec = kbuf->st_mtim.tv_sec;
 137         buf->st_mtim.tv_nsec = kbuf->st_mtim.tv_nsec;
 138         buf->st_ctim.tv_sec = kbuf->st_ctim.tv_sec;
 139         buf->st_ctim.tv_nsec = kbuf->st_ctim.tv_nsec;
 140 #else
 141         buf->st_atime = kbuf->st_atime;
 142         buf->st_mtime = kbuf->st_mtime;
 143         buf->st_ctime = kbuf->st_ctime;
 144 #endif
 145 #ifdef _HAVE_STAT64___UNUSED1
 146         buf->__glibc_reserved1 = 0;
 147 #endif
 148 #ifdef _HAVE_STAT64___UNUSED2
 149         buf->__glibc_reserved2 = 0;
 150 #endif
 151 #ifdef _HAVE_STAT64___UNUSED3
 152         buf->__glibc_reserved3 = 0;
 153 #endif
 154 #ifdef _HAVE_STAT64___UNUSED4
 155         buf->__glibc_reserved4 = 0;
 156 #endif
 157 #ifdef _HAVE_STAT64___UNUSED5
 158         buf->__glibc_reserved5 = 0;
 159 #endif
 160       }
 161       break;
 162
 163       /* If struct stat64 is different from struct stat then
 164          _STAT_VER_KERNEL does not make sense.  */
 165     case _STAT_VER_KERNEL:
 166     default:
 167       return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
 168     }
 169
 170   return 0;
 171 #endif
 172 }
 173
 174 int
 175 __xstat32_conv (int vers, struct stat64 *kbuf, struct stat *buf)
 176 {
 177   switch (vers)
 178     {
 179     case _STAT_VER_LINUX:
 180       {
 181         /* Convert current kernel version of `struct stat64' to
 182            `struct stat'.  */
 183         buf->st_dev = kbuf->st_dev;
 184 #ifdef _HAVE_STAT___PAD1
 185         buf->__pad1 = 0;
 186 #endif
 187         buf->st_ino = kbuf->st_ino;
 188         if (sizeof (buf->st_ino) != sizeof (kbuf->st_ino)
 189             && buf->st_ino != kbuf->st_ino)
 190           return INLINE_SYSCALL_ERROR_RETURN_VALUE (EOVERFLOW);
 191         buf->st_mode = kbuf->st_mode;
 192         buf->st_nlink = kbuf->st_nlink;
 193         buf->st_uid = kbuf->st_uid;
 194         buf->st_gid = kbuf->st_gid;
 195         buf->st_rdev = kbuf->st_rdev;
 196 #ifdef _HAVE_STAT___PAD2
 197         buf->__pad2 = 0;
 198 #endif
 199         buf->st_size = kbuf->st_size;
 200         /* Check for overflow.  */
 201         if (sizeof (buf->st_size) != sizeof (kbuf->st_size)
 202             && buf->st_size != kbuf->st_size)
 203           return INLINE_SYSCALL_ERROR_RETURN_VALUE (EOVERFLOW);
 204         buf->st_blksize = kbuf->st_blksize;
 205         buf->st_blocks = kbuf->st_blocks;
 206         /* Check for overflow.  */
 207         if (sizeof (buf->st_blocks) != sizeof (kbuf->st_blocks)
 208             && buf->st_blocks != kbuf->st_blocks)
 209           return INLINE_SYSCALL_ERROR_RETURN_VALUE (EOVERFLOW);
 210 #ifdef _HAVE_STAT_NSEC
 211         buf->st_atim.tv_sec = kbuf->st_atim.tv_sec;
 212         buf->st_atim.tv_nsec = kbuf->st_atim.tv_nsec;
 213         buf->st_mtim.tv_sec = kbuf->st_mtim.tv_sec;
 214         buf->st_mtim.tv_nsec = kbuf->st_mtim.tv_nsec;
 215         buf->st_ctim.tv_sec = kbuf->st_ctim.tv_sec;
 216         buf->st_ctim.tv_nsec = kbuf->st_ctim.tv_nsec;
 217 #else
 218         buf->st_atime = kbuf->st_atime;
 219         buf->st_mtime = kbuf->st_mtime;
 220         buf->st_ctime = kbuf->st_ctime;
 221 #endif
 222
 223 #ifdef _HAVE_STAT___UNUSED1
 224         buf->__glibc_reserved1 = 0;
 225 #endif
 226 #ifdef _HAVE_STAT___UNUSED2
 227         buf->__glibc_reserved2 = 0;
 228 #endif
 229 #ifdef _HAVE_STAT___UNUSED3
 230         buf->__glibc_reserved3 = 0;
 231 #endif
 232 #ifdef _HAVE_STAT___UNUSED4
 233         buf->__glibc_reserved4 = 0;
 234 #endif
 235 #ifdef _HAVE_STAT___UNUSED5
 236         buf->__glibc_reserved5 = 0;
 237 #endif
 238       }
 239       break;
 240
 241       /* If struct stat64 is different from struct stat then
 242          _STAT_VER_KERNEL does not make sense.  */
 243     case _STAT_VER_KERNEL:
 244     default:
 245       return INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
 246     }
 247
 248   return 0;
 249 }
 250
 251 #endif