support/support_set_vma_name_supported.c

   1 /* Check if kernel supports set VMA range name.
   2    Copyright (C) 2023 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 #include <support/check.h>
  20 #include <support/support.h>
  21 #include <support/xunistd.h>
  22 #include <sys/mman.h>
  23 #ifdef __linux__
  24 # include <sys/prctl.h>
  25 #endif
  26
  27 bool
  28 support_set_vma_name_supported (void)
  29 {
  30 #ifdef __linux__
  31   size_t size = sysconf (_SC_PAGESIZE);
  32   if (size == -1)
  33     FAIL_EXIT1 ("sysconf (_SC_PAGESIZE): %m\n");
  34
  35   void *vma = xmmap (0,
  36                      size,
  37                      PROT_NONE,
  38                      MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE,
  39                      -1);
  40
  41   int r = prctl (PR_SET_VMA, PR_SET_VMA_ANON_NAME, vma, size, "vmaname");
  42
  43   xmunmap (vma, size);
  44
  45   return r == 0;
  46 #else
  47   return false;
  48 #endif
  49 }