Function copy_reg

src/copy.c:728–1150

   to give it slightly more up-to-date contents.  */

static bool
copy_reg (char const *src_name, char const *dst_name,
          int dst_dirfd, char const *dst_relname,
          const struct cp_options *x,
          mode_t dst_mode, mode_t omitted_permissions, bool *new_dst,
          struct stat *src_sb)
{
  int dest_desc;
  int dest_errno;
  int source_desc;
  mode_t extra_permissions;
  struct stat sb;
  struct stat src_open_sb;
  bool return_val = true;
  bool data_copy_required = x->data_copy_required;
  bool preserve_xattr = USE_XATTR & x->preserve_xattr;

  copy_debug.offload = COPY_DEBUG_UNKNOWN;
  copy_debug.reflink = x->reflink_mode ? COPY_DEBUG_UNKNOWN : COPY_DEBUG_NO;
  copy_debug.sparse_detection = COPY_DEBUG_UNKNOWN;

  source_desc = open (src_name,
                      (O_RDONLY | O_BINARY
                       | (x->dereference == DEREF_NEVER ? O_NOFOLLOW : 0)));
  if (source_desc < 0)
    {
      error (0, errno, _("cannot open %s for reading"), quoteaf (src_name));
      return false;
    }

  if (fstat (source_desc, &src_open_sb) != 0)
    {
      error (0, errno, _("cannot fstat %s"), quoteaf (src_name));
      return_val = false;
      goto close_src_desc;
    }

  /* Compare the source dev/ino from the open file to the incoming,
     saved ones obtained via a previous call to stat.  */
  if (! psame_inode (src_sb, &src_open_sb))
    {
      error (0, 0,
             _("skipping file %s, as it was replaced while being copied"),
             quoteaf (src_name));
      return_val = false;
      goto close_src_desc;
    }

  /* Might as well tell the caller about the latest version of the
     source file status, since we have it already.  */
  *src_sb = src_open_sb;
  mode_t src_mode = src_sb->st_mode;

  /* The semantics of the following open calls are mandated
     by the specs for both cp and mv.  */
  if (! *new_dst)
    {
      int open_flags =