1  #!/usr/bin/python3
       2  # Test that glibc's sys/mman.h constants match the kernel's.
       3  # Copyright (C) 2018-2023 Free Software Foundation, Inc.
       4  # This file is part of the GNU C Library.
       5  #
       6  # The GNU C Library is free software; you can redistribute it and/or
       7  # modify it under the terms of the GNU Lesser General Public
       8  # License as published by the Free Software Foundation; either
       9  # version 2.1 of the License, or (at your option) any later version.
      10  #
      11  # The GNU C Library is distributed in the hope that it will be useful,
      12  # but WITHOUT ANY WARRANTY; without even the implied warranty of
      13  # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14  # Lesser General Public License for more details.
      15  #
      16  # You should have received a copy of the GNU Lesser General Public
      17  # License along with the GNU C Library; if not, see
      18  # <https://www.gnu.org/licenses/>.
      19  
      20  import argparse
      21  import sys
      22  
      23  import glibcextract
      24  import glibcsyscalls
      25  
      26  
      27  def main():
      28      """The main entry point."""
      29      parser = argparse.ArgumentParser(
      30          description="Test that glibc's sys/mman.h constants "
      31          "match the kernel's.")
      32      parser.add_argument('--cc', metavar='CC',
      33                          help='C compiler (including options) to use')
      34      args = parser.parse_args()
      35      linux_version_headers = glibcsyscalls.linux_kernel_version(args.cc)
      36      linux_version_glibc = (6, 3)
      37      sys.exit(glibcextract.compare_macro_consts(
      38          '#define _GNU_SOURCE 1\n'
      39          '#include <sys/mman.h>\n',
      40          '#define _GNU_SOURCE 1\n'
      41          '#include <linux/mman.h>\n',
      42          args.cc,
      43          'MAP_.*',
      44          # A series of MAP_HUGE_<size> macros are defined by the kernel
      45          # but not by glibc.  MAP_UNINITIALIZED is kernel-only.
      46          # MAP_FAILED is not a MAP_* flag and is glibc-only, as is the
      47          # MAP_ANON alias for MAP_ANONYMOUS.  MAP_RENAME, MAP_AUTOGROW,
      48          # MAP_LOCAL and MAP_AUTORSRV are in the kernel header for
      49          # MIPS, marked as "not used by linux"; SPARC has MAP_INHERIT
      50          # in the kernel header, but does not use it.  The kernel
      51          # header for HPPA removed a define of MAP_VARIABLE to 0 in
      52          # Linux 6.2.
      53          'MAP_HUGE_[0-9].*|MAP_UNINITIALIZED|MAP_FAILED|MAP_ANON'
      54          '|MAP_RENAME|MAP_AUTOGROW|MAP_LOCAL|MAP_AUTORSRV|MAP_INHERIT'
      55          '|MAP_VARIABLE',
      56          linux_version_glibc > linux_version_headers,
      57          linux_version_headers > linux_version_glibc))
      58  
      59  if __name__ == '__main__':
      60      main()