sysdeps/nacl/xstatconv.c

   1 /* Convert between the NaCl ABI's `struct stat' format, and libc's.
   2    Copyright (C) 2015 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 <string.h>
  20 #include <sys/stat.h>
  21 #include <xstatconv.h>
  22
  23 internal_function
  24 int
  25 __xstat_conv (int vers, const struct nacl_abi_stat *kbuf, void *ubuf)
  26 {
  27   /* It's kosher enough just to crash here, but there are some
  28      existing NaCl tests that like to see EFAULT, and that's what
  29      making the IRT call with NULL would give.  */
  30   if (__glibc_unlikely (ubuf == NULL))
  31     {
  32       __set_errno (EFAULT);
  33       return -1;
  34     }
  35
  36   switch (vers)
  37     {
  38     case _STAT_VER_NACL:
  39       /* Nothing to do.  The struct is in the form the NaCl ABI expects.  */
  40       *(struct nacl_abi_stat *) ubuf = *kbuf;
  41       break;
  42
  43     case _STAT_VER_LINUX:
  44       {
  45         struct stat *buf = ubuf;
  46
  47         /* Zero-fill the pad/unused fields.  */
  48         memset (buf, 0, sizeof *buf);
  49
  50         /* Convert from NaCl IRT ABI `struct stat'.  */
  51         buf->st_dev = kbuf->nacl_abi_st_dev;
  52         buf->st_ino = kbuf->nacl_abi_st_ino;
  53         buf->st_mode = kbuf->nacl_abi_st_mode;
  54         buf->st_nlink = kbuf->nacl_abi_st_nlink;
  55         buf->st_uid = kbuf->nacl_abi_st_uid;
  56         buf->st_gid = kbuf->nacl_abi_st_gid;
  57         buf->st_rdev = kbuf->nacl_abi_st_rdev;
  58         buf->st_size = kbuf->nacl_abi_st_size;
  59         buf->st_blksize = kbuf->nacl_abi_st_blksize;
  60         buf->st_blocks = kbuf->nacl_abi_st_blocks;
  61         buf->st_atim.tv_sec = kbuf->nacl_abi_st_atime;
  62         buf->st_atim.tv_nsec = kbuf->nacl_abi_st_atimensec;
  63         buf->st_mtim.tv_sec = kbuf->nacl_abi_st_mtime;
  64         buf->st_mtim.tv_nsec = kbuf->nacl_abi_st_mtimensec;
  65         buf->st_ctim.tv_sec = kbuf->nacl_abi_st_ctime;
  66         buf->st_ctim.tv_nsec = kbuf->nacl_abi_st_ctimensec;
  67       }
  68       break;
  69
  70     default:
  71       __set_errno (EINVAL);
  72       return -1;
  73     }
  74
  75   return 0;
  76 }