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/* Test error reporting for dlsym, dlvsym failures.
Copyright (C) 2016-2023 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
<https://www.gnu.org/licenses/>. */
#include <dlfcn.h>
#include <gnu/lib-names.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* Used to disambiguate symbol names. */
static int counter;
static void
test_one (void *handle, const char *name, void *(func) (void *, const char *),
const char *suffix)
{
++counter;
char symbol[32];
snprintf (symbol, sizeof (symbol), "no_such_symbol_%d", counter);
char *expected_message;
if (asprintf (&expected_message, ": undefined symbol: %s%s",
symbol, suffix) < 0)
{
printf ("error: asprintf: %m\n");
abort ();
}
void *addr = func (handle, symbol);
if (addr != NULL)
{
printf ("error: %s: found symbol \"no_such_symbol\"\n", name);
abort ();
}
const char *message = dlerror ();
if (message == NULL)
{
printf ("error: %s: missing error message\n", name);
abort ();
}
const char *message_without_path = strchrnul (message, ':');
if (strcmp (message_without_path, expected_message) != 0)
{
printf ("error: %s: unexpected error message: %s\n", name, message);
abort ();
}
free (expected_message);
message = dlerror ();
if (message != NULL)
{
printf ("error: %s: unexpected error message: %s\n", name, message);
abort ();
}
}
static void
test_handles (const char *name, void *(func) (void *, const char *),
const char *suffix)
{
test_one (RTLD_DEFAULT, name, func, suffix);
test_one (RTLD_NEXT, name, func, suffix);
void *handle = dlopen (LIBC_SO, RTLD_LAZY);
if (handle == NULL)
{
printf ("error: cannot dlopen %s: %s\n", LIBC_SO, dlerror ());
abort ();
}
test_one (handle, name, func, suffix);
dlclose (handle);
}
static void *
dlvsym_no_such_version (void *handle, const char *name)
{
return dlvsym (handle, name, "NO_SUCH_VERSION");
}
static void *
dlvsym_glibc_private (void *handle, const char *name)
{
return dlvsym (handle, name, "GLIBC_PRIVATE");
}
static int
do_test (void)
{
test_handles ("dlsym", dlsym, "");
test_handles ("dlvsym", dlvsym_no_such_version,
", version NO_SUCH_VERSION");
test_handles ("dlvsym", dlvsym_glibc_private,
", version GLIBC_PRIVATE");
return 0;
}
#include <support/test-driver.c>
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