gdb/unittests/scoped_mmap-selftests.c

   1 /* Self tests for scoped_mmap for GDB, the GNU debugger.
   2
   3    Copyright (C) 2018 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21
  22 #include "common/scoped_mmap.h"
  23 #include "config.h"
  24
  25 #if defined(HAVE_SYS_MMAN_H) && defined(HAVE_UNISTD_H)
  26
  27 #include "selftest.h"
  28
  29 #include <unistd.h>
  30
  31 namespace selftests {
  32 namespace scoped_mmap {
  33
  34 /* Test that the file is unmapped.  */
  35 static void
  36 test_destroy ()
  37 {
  38   void *mem;
  39
  40   errno = 0;
  41   {
  42     ::scoped_mmap smmap (nullptr, sysconf (_SC_PAGESIZE), PROT_WRITE,
  43                          MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
  44
  45     mem = smmap.get ();
  46     SELF_CHECK (mem != nullptr);
  47   }
  48
  49   SELF_CHECK (msync (mem, sysconf (_SC_PAGESIZE), 0) == -1 && errno == ENOMEM);
  50 }
  51
  52 /* Test that the memory can be released.  */
  53 static void
  54 test_release ()
  55 {
  56   void *mem;
  57
  58   errno = 0;
  59   {
  60     ::scoped_mmap smmap (nullptr, sysconf (_SC_PAGESIZE), PROT_WRITE,
  61                          MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
  62
  63     mem = smmap.release ();
  64     SELF_CHECK (mem != nullptr);
  65   }
  66
  67   SELF_CHECK (msync (mem, sysconf (_SC_PAGESIZE), 0) == 0 || errno != ENOMEM);
  68
  69   munmap (mem, sysconf (_SC_PAGESIZE));
  70 }
  71
  72 /* Run selftests.  */
  73 static void
  74 run_tests ()
  75 {
  76   test_destroy ();
  77   test_release ();
  78 }
  79
  80 } /* namespace scoped_mmap */
  81 } /* namespace selftests */
  82
  83 #endif /* !defined(HAVE_SYS_MMAN_H) || !defined(HAVE_UNISTD_H) */
  84
  85 void
  86 _initialize_scoped_mmap_selftests ()
  87 {
  88 #if defined(HAVE_SYS_MMAN_H) && defined(HAVE_UNISTD_H)
  89   selftests::register_test ("scoped_mmap",
  90                             selftests::scoped_mmap::run_tests);
  91 #endif
  92 }