New module 'unlinkat', split off from module 'openat'. * m4/unlinkat.m4: New file, extracted from m4/openat.m4. * m4/openat.m4 (gl_FUNC_OPENAT): Don't set GNULIB_UNLINKAT, REPLACE_UNLINKAT, HAVE_UNLINKAT. Don't test for unlinkat. * modules/unlinkat: New file, extracted from modules/openat. Correct the dependency conditions. * modules/openat (Files): Remove lib/unlinkat.c. (Depends-on): Remove rmdir, unlink. (configure.ac): Remove AC_LIBOBJ of unlinkat. * modules/unlinkat-tests: New file, extracted from modules/openat-tests. * modules/openat-tests (Files): Remove tests/test-unlinkat.c, tests/test-rmdir.h, tests/test-unlink.h. (Depends-on): Remove unlinkdir. (Makefile.am): Remove rules for test-unlinkat. * doc/posix-functions/unlinkat.texi: Mention module 'unlinkat' instead of module 'openat'. * NEWS: Mention the change. * modules/linkat-tests (Depends-on): Add unlinkat. * modules/mkfifoat-tests (Depends-on): Likewise. * modules/readlinkat-tests (Depends-on): Likewise.

# unlinkat.m4 serial 1
dnl Copyright (C) 2004-2011 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.

# Written by Jim Meyering.

AC_DEFUN([gl_FUNC_UNLINKAT],
[
  AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
  AC_CHECK_FUNCS_ONCE([unlinkat])
  AC_REQUIRE([gl_FUNC_UNLINK])
  AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
  if test $ac_cv_func_unlinkat = no; then
    HAVE_UNLINKAT=0
  else
    if test $gl_cv_func_lstat_dereferences_slashed_symlink != yes; then
      # Solaris 9 has *at functions, but uniformly mishandles trailing
      # slash in all of them.
      REPLACE_UNLINKAT=1
    else
      # GNU/Hurd has unlinkat, but it has the same bug as unlink.
      if test $REPLACE_UNLINK = 1; then
        REPLACE_UNLINKAT=1
      fi
    fi
  fi
])