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      1 /* Copyright 2023-2024 Free Software Foundation, Inc.
      2 
      3    This program is free software; you can redistribute it and/or modify
      4    it under the terms of the GNU General Public License as published by
      5    the Free Software Foundation; either version 3 of the License, or
      6    (at your option) any later version.
      7 
      8    This program is distributed in the hope that it will be useful,
      9    but WITHOUT ANY WARRANTY; without even the implied warranty of
     10    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     11    GNU General Public License for more details.
     12 
     13    You should have received a copy of the GNU General Public License
     14    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
     15 
     16 #include <dlfcn.h>
     17 #include <stdlib.h>
     18 
     19 void
     20 breakpt (void)
     21 {
     22   /* Nothing.  */
     23 }
     24 
     25 volatile int global_counter = 0;
     26 
     27 volatile int call_count = 1;
     28 
     29 int
     30 main (void)
     31 {
     32   void *handle;
     33   void (*func)(int);
     34 
     35   /* Some filler work so that we don't initially stop on the breakpt call
     36      below.  */
     37   ++global_counter;
     38 
     39   breakpt ();	/* Break before open.  */
     40 
     41   /* Now load the shared library.  */
     42   handle = dlopen (SHLIB_NAME, RTLD_LAZY);
     43   if (handle == NULL)
     44     abort ();
     45 
     46   breakpt ();	/* Break after open.  */
     47 
     48   /* Find the function symbol.  */
     49   func = (void (*)(int)) dlsym (handle, "foo");
     50 
     51   for (; call_count > 0; --call_count)
     52     {
     53       /* Call the library function.  */
     54       func (1);
     55     }
     56 
     57   breakpt ();	/* Break before close.  */
     58 
     59   /* Unload the shared library.  */
     60   if (dlclose (handle) != 0)
     61     abort ();
     62 
     63   breakpt ();	/* Break after close.  */
     64 
     65   return 0;
     66 }
     67