elf/tst-dlmopen-twice.c

   1 /* Initialization of libc after dlmopen/dlclose/dlmopen (bug 29528).  Main.
   2    Copyright (C) 2022-2024 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 <stdio.h>
  20 #include <support/check.h>
  21 #include <support/xdlfcn.h>
  22
  23 /* Run the test multiple times, to check finding a new namespace while
  24    another namespace is already in use.  This used to trigger bug 29600.  */
  25 static void
  26 recurse (int depth)
  27 {
  28   if (depth == 0)
  29     return;
  30
  31   printf ("info: running at depth %d\n", depth);
  32   void *handle = xdlmopen (LM_ID_NEWLM, "tst-dlmopen-twice-mod1.so",
  33                            RTLD_NOW);
  34   xdlclose (handle);
  35   handle = xdlmopen (LM_ID_NEWLM, "tst-dlmopen-twice-mod2.so", RTLD_NOW);
  36   int (*run_check) (void) = xdlsym (handle, "run_check");
  37   TEST_COMPARE (run_check (), 0);
  38   recurse (depth - 1);
  39   xdlclose (handle);
  40 }
  41
  42 static int
  43 do_test (void)
  44 {
  45   /* First run the test without nesting.  */
  46   recurse (1);
  47
  48   /* Then with nesting.  The constant needs to be less than the
  49      glibc.rtld.nns tunable (which is 4 by default).  */
  50   recurse (3);
  51   return 0;
  52 }
  53
  54 #include <support/test-driver.c>