glibc/dlfcn/errmsg1.c

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/* Copyright (C) 2000-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <dlfcn.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int
main (void)
{
void *h;
const char *s;
/* Test that dlerror works initially. */
s = dlerror ();
printf ("dlerror() without prior dl*() call returned: %s\n", s);
if (s != NULL)
return 1;
h = dlopen ("errmsg1mod.so", RTLD_NOW);
if (h != NULL)
{
dlclose (h);
puts ("errmsg1mod.so could be loaded !?");
exit (1);
}
s = dlerror ();
puts (s);
return strstr (s, "errmsg1mod.so") == NULL;
}