blob: 4afd81b1f4430d837e1d07d4e4461da090beb279 [file] [log] [blame]
/* Make sure dlopen/dlclose are not marked as leaf functions.
Copyright (C) 2013-2014 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Mike Frysinger <>
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
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
<>. */
/* The bug-dl-leaf.c file will call our lib_main directly. We do this to
keep things simple -- no need to use --export-dynamic with the linker
or build the main ELF as a PIE.
The lib_main func will modify some of its state while dlopening and
dlclosing the library. The constructors and
destructors in that library will call back into this library to also
muck with state (the check_val_xxx funcs).
If dlclose/dlopen are marked as "leaf" functions, then with newer
versions of gcc, the state modification won't work correctly. */
#include <assert.h>
#include <dlfcn.h>
static int val = 1;
static int called = 0;
void check_val_init (void)
called = 1;
assert (val == 2);
void check_val_fini (void)
called = 2;
assert (val == 4);
int lib_main (void)
int ret;
void *hdl;
/* Make sure the constructor sees the updated val. */
val = 2;
hdl = dlopen ("", RTLD_GLOBAL | RTLD_LAZY);
val = 3;
assert (hdl);
assert (called == 1);
/* Make sure the destructor sees the updated val. */
val = 4;
ret = dlclose (hdl);
val = 5;
assert (ret == 0);
assert (called == 2);
return !val;