elf/dl-unmap-segments.h

   1 /* Unmap a shared object's segments.  Generic version.
   2    Copyright (C) 2014-2021 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    <https://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _DL_UNMAP_SEGMENTS_H
  20 #define _DL_UNMAP_SEGMENTS_H    1
  21
  22 #include <link.h>
  23 #include <sys/mman.h>
  24
  25 /* _dl_map_segments ensures that any whole pages in gaps between segments
  26    are filled in with PROT_NONE mappings.  So we can just unmap the whole
  27    range in one fell swoop.  */
  28
  29 static __always_inline void
  30 _dl_unmap_segments (struct link_map *l)
  31 {
  32   __munmap ((void *) l->l_map_start, l->l_map_end - l->l_map_start);
  33 }
  34
  35 #endif  /* dl-unmap-segments.h */