/* vfork ABI-compatibility entry points for libpthread.

   Copyright (C) 2014-2018 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

   <http://www.gnu.org/licenses/>.  */

#include <unistd.h>

#include <shlib-compat.h>

/* libpthread used to have its own vfork implementation that differed

   from libc's only in having a pointless micro-optimization.  There

   is no longer any use to having a separate copy in libpthread, but

   the historical ABI requires it.  For static linking, there is no

   need to provide anything here--the libc version will be linked in.

   For shared library ABI compatibility, there must be __vfork and

   vfork symbols in libpthread.so; so we define them using IFUNC to

   redirect to the libc function.  */

/* Note! If the architecture doesn't support IFUNC, then we need an

   alternate target-specific mechanism to implement this.  So we just

   assume IFUNC here and require that the target override this file

   if necessary.

   If the architecture can assume all supported versions of gcc will

   produce a tail-call to __libc_vfork, consider including the version

   in sysdeps/unix/sysv/linux/aarch64/pt-vfork.c.  */

#if !HAVE_IFUNC

# error "must write pt-vfork for this machine or get IFUNC support"

#endif

#if (SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20) \

     || SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20))

extern __typeof (vfork) __libc_vfork;   /* Defined in libc.  */

# undef INIT_ARCH

# define INIT_ARCH()

# define DEFINE_VFORK(name) libc_ifunc (name, &__libc_vfork)

#endif

#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20)

extern __typeof(vfork) vfork_ifunc;

DEFINE_VFORK (vfork_ifunc)

compat_symbol (libpthread, vfork_ifunc, vfork, GLIBC_2_0);

#endif

#if SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20)

extern __typeof(vfork) __vfork_ifunc;

DEFINE_VFORK (__vfork_ifunc)

compat_symbol (libpthread, __vfork_ifunc, __vfork, GLIBC_2_1_2);

#endif