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1/* vfork ABI-compatibility entry points for libpthread.
2 Copyright (C) 2014-2019 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <shlib-compat.h>
20
21/* libpthread used to have its own vfork implementation that differed
22 from libc's only in having a pointless micro-optimization. There
23 is no longer any use to having a separate copy in libpthread, but
24 the historical ABI requires it. For static linking, there is no
25 need to provide anything here--the libc version will be linked in.
26 For shared library ABI compatibility, there must be __vfork and
27 vfork symbols in libpthread.so. */
28
29#if HAVE_IFUNC
30# include <nptl/pt-vfork.c>
31#elif (SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20) \
32 || SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20))
33
34/* Thankfully, on AArch64 we can rely on the compiler generating
35 a tail call here. */
36
37extern void __libc_vfork (void);
38
39void
40vfork_compat (void)
41{
42 __libc_vfork ();
43}
44
45# if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20)
46compat_symbol (libpthread, vfork_compat, vfork, GLIBC_2_0);
47# endif
48
49# if SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20)
50strong_alias (vfork_compat, vfork_compat2)
51compat_symbol (libpthread, vfork_compat2, __vfork, GLIBC_2_1_2);
52# endif
53
54#endif
55

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