From 82eef55f8fad3e00c53050de5d6ebea08df488b3 Mon Sep 17 00:00:00 2001 From: Florian Weimer Date: Thu, 4 Jan 2018 18:46:17 +0100 Subject: elf: Support dlvsym within libc.so This commit adds a new _dl_open_hook entry for dlvsym and implements the function using the existing dl_lookup_symbol_x function supplied by the dynamic loader. A new hook variable, _dl_open_hook2, is introduced, which should make this change suitable for backporting: For old statically linked binaries, __libc_dlvsym will always return NULL. --- elf/tst-libc_dlvsym-static.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 elf/tst-libc_dlvsym-static.c (limited to 'elf/tst-libc_dlvsym-static.c') diff --git a/elf/tst-libc_dlvsym-static.c b/elf/tst-libc_dlvsym-static.c new file mode 100644 index 0000000000..955f28d754 --- /dev/null +++ b/elf/tst-libc_dlvsym-static.c @@ -0,0 +1,32 @@ +/* Compare dlvsym and __libc_dlvsym results. Static version. + Copyright (C) 2017 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 + . */ + +#include + +static int +do_test (void) +{ + void *handle = xdlopen ("tst-libc_dlvsym-dso.so", RTLD_LAZY); + void (*compare) (void) = xdlsym (handle, "compare_vsyms_global"); + compare (); + xdlclose (handle); + + return 0; +} + +#include -- cgit v1.2.3