Re: [PATCH] libstdc++-v3: check for openat

[Alexandre Oliva <oliva@adacore.com>]

On Jun 27, 2022, Alexandre Oliva <oliva@adacore.com> wrote:

> It looks like the atp.pathname is missing the nonexistent_path
> assigned to variable dir in test_pr99290, so we attempt to open
> subdirs thereof as if with openat.

This appears to be caused by the early return in fs::_Dir's ctor:

  _Dir(const fs::path& p, bool skip_permission_denied, bool nofollow,
       [[maybe_unused]] bool filename_only, error_code& ec)
  : _Dir_base(p.c_str(), skip_permission_denied, nofollow, ec)
  {
#if _GLIBCXX_HAVE_DIRFD // && 0
    if (filename_only)
      return; // Do not store path p when we aren't going to use it.
#endif

    if (!ec)
      path = p;
  }

but somehow disabling the early return to force the saving of path
appears to break copy(): copy.cc's test01() succeeded without the '&& 0'
that I've commented-out above, but started failing to create 'to' in the
copy at line copy.cc:54 when I put it in to prevent the early return.

Does that make any sense to you?

-- 
Alexandre Oliva, happy hacker                https://FSFLA.org/blogs/lxo/
   Free Software Activist                       GNU Toolchain Engineer
Disinformation flourishes because many people care deeply about injustice
but very few check the facts.  Ask me about <https://stallmansupport.org>