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114 lines
3.1 KiB
C
114 lines
3.1 KiB
C
/* Test error reporting for dlsym, dlvsym failures.
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Copyright (C) 2016-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <dlfcn.h>
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#include <gnu/lib-names.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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/* Used to disambiguate symbol names. */
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static int counter;
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static void
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test_one (void *handle, const char *name, void *(func) (void *, const char *),
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const char *suffix)
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{
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++counter;
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char symbol[32];
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snprintf (symbol, sizeof (symbol), "no_such_symbol_%d", counter);
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char *expected_message;
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if (asprintf (&expected_message, ": undefined symbol: %s%s",
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symbol, suffix) < 0)
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{
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printf ("error: asprintf: %m\n");
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abort ();
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}
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void *addr = func (handle, symbol);
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if (addr != NULL)
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{
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printf ("error: %s: found symbol \"no_such_symbol\"\n", name);
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abort ();
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}
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const char *message = dlerror ();
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if (message == NULL)
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{
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printf ("error: %s: missing error message\n", name);
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abort ();
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}
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const char *message_without_path = strchrnul (message, ':');
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if (strcmp (message_without_path, expected_message) != 0)
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{
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printf ("error: %s: unexpected error message: %s\n", name, message);
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abort ();
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}
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free (expected_message);
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message = dlerror ();
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if (message != NULL)
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{
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printf ("error: %s: unexpected error message: %s\n", name, message);
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abort ();
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}
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}
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static void
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test_handles (const char *name, void *(func) (void *, const char *),
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const char *suffix)
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{
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test_one (RTLD_DEFAULT, name, func, suffix);
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test_one (RTLD_NEXT, name, func, suffix);
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void *handle = dlopen (LIBC_SO, RTLD_LAZY);
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if (handle == NULL)
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{
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printf ("error: cannot dlopen %s: %s\n", LIBC_SO, dlerror ());
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abort ();
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}
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test_one (handle, name, func, suffix);
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dlclose (handle);
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}
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static void *
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dlvsym_no_such_version (void *handle, const char *name)
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{
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return dlvsym (handle, name, "NO_SUCH_VERSION");
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}
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static void *
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dlvsym_glibc_private (void *handle, const char *name)
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{
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return dlvsym (handle, name, "GLIBC_PRIVATE");
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}
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static int
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do_test (void)
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{
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test_handles ("dlsym", dlsym, "");
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test_handles ("dlvsym", dlvsym_no_such_version,
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", version NO_SUCH_VERSION");
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test_handles ("dlvsym", dlvsym_glibc_private,
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", version GLIBC_PRIVATE");
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return 0;
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}
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#include <support/test-driver.c>
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