gdb/testsuite/gdb.base/solib-vanish-main.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2017-2022 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program 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
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #include <dlfcn.h>
  19 #include <errno.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23
  24 int
  25 main ()
  26 {
  27   void *handle;
  28   int (*foo) (int);
  29   char *error;
  30   char *dest = VANISH_LIB ".renamed";
  31
  32   /* Open library.  */
  33   handle = dlopen (VANISH_LIB, RTLD_NOW);
  34   if (!handle)
  35     {
  36       fprintf (stderr, "%s\n", dlerror ());
  37       exit (EXIT_FAILURE);
  38     }
  39
  40   /* Clear any existing error */
  41   dlerror ();
  42
  43   /* Simulate deleting file by renaming it.  */
  44   if (rename (VANISH_LIB, dest) == -1)
  45     {
  46       error = strerror (errno);
  47       fprintf (stderr, "rename %s -> %s: %s\n", VANISH_LIB, dest, error);
  48       exit (EXIT_FAILURE);
  49     }
  50
  51   /* Get function pointer.  */
  52   foo = dlsym (handle, "foo");
  53   error = dlerror ();
  54   if (error != NULL)
  55     {
  56       fprintf (stderr, "%s\n", error);
  57       exit (EXIT_FAILURE);
  58     }
  59
  60   /* Call function.  */
  61   (*foo) (1);
  62
  63   /* Close and exit.  */
  64   dlclose (handle);
  65
  66   /* Put VANISH_LIB back where we found it.  */
  67   if (rename (dest, VANISH_LIB) == -1)
  68     {
  69       error = strerror (errno);
  70       fprintf (stderr, "rename %s -> %s: %s\n", dest, VANISH_LIB, error);
  71       exit (EXIT_FAILURE);
  72     }
  73
  74   exit (EXIT_SUCCESS);
  75 }