1/* ABI compatibility for 'fork' 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 <unistd.h>
21#include <shlib-compat.h>
22
23/* libpthread once had its own fork, though there was no apparent reason
24 for it. There is no use in having a separate symbol in libpthread, but
25 the historical ABI requires it. For static linking, there is no need to
26 provide anything here--the libc version will be linked in. For shared
27 library ABI compatibility, there must be __fork and fork symbols in
28 libpthread.so.
29
30 With an IFUNC resolver, it would be possible to avoid the
31 indirection, but the IFUNC resolver might run before the
32 __libc_fork symbol has been relocated, in which case the IFUNC
33 resolver would not be able to provide the correct address. */
34
35#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_22)
36
37static pid_t __attribute__ ((used))
38fork_compat (void)
39{
40 return __libc_fork ();
41}
42
43strong_alias (fork_compat, fork_alias)
44compat_symbol (libpthread, fork_alias, fork, GLIBC_2_0);
45
46strong_alias (fork_compat, __fork_alias)
47compat_symbol (libpthread, __fork_alias, __fork, GLIBC_2_0);
48
49#endif
50