1/* ABI compatibility for 'system' symbol in libpthread ABI.
2 Copyright (C) 2002-2020 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <https://www.gnu.org/licenses/>. */
19
20#include <stdlib.h>
21#include <shlib-compat.h>
22
23/* libpthread once had its own 'system', though there was no apparent
24 reason for it. There is no use in having a separate symbol in
25 libpthread, but the historical ABI requires it. For static linking,
26 there is no need to provide anything here--the libc version will be
27 linked in. For shared library ABI compatibility, there must be a
28 'system' symbol in libpthread.so.
29
30 With an IFUNC resolver, it would be possible to avoid the indirection,
31 but the IFUNC resolver might run before the __libc_system symbol has
32 been relocated, in which case the IFUNC resolver would not be able to
33 provide the correct address. */
34
35#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_22)
36
37static int __attribute__ ((used))
38system_compat (const char *line)
39{
40 return __libc_system (line);
41}
42strong_alias (system_compat, system_alias)
43compat_symbol (libpthread, system_alias, system, GLIBC_2_0);
44
45#endif
46