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[thirdparty/glibc.git] / sysdeps / unix / sysv / linux / aarch64 / pt-vfork.c

/* 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 <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.  */

#if HAVE_IFUNC
# include <nptl/pt-vfork.c>
#elif (SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20) \
       || SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20))

/* Thankfully, on AArch64 we can rely on the compiler generating
   a tail call here.  */

extern void __libc_vfork (void);

void
vfork_compat (void)
{
  __libc_vfork ();
}

# if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20)
compat_symbol (libpthread, vfork_compat, vfork, GLIBC_2_0);
# endif

# if SHLIB_COMPAT (libpthread, GLIBC_2_1_2, GLIBC_2_20)
strong_alias (vfork_compat, vfork_compat2)
compat_symbol (libpthread, vfork_compat2, __vfork, GLIBC_2_1_2);
# endif

#endif