[Feature][ZXW-33]merge ZXW 0428 version
Change-Id: I11f167edfea428d9fab198ff00ff1364932d1b0b
diff --git a/ap/libc/glibc/glibc-2.23/nptl/pt-vfork.c b/ap/libc/glibc/glibc-2.23/nptl/pt-vfork.c
new file mode 100644
index 0000000..8f4be0c
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/nptl/pt-vfork.c
@@ -0,0 +1,77 @@
+/* vfork ABI-compatibility entry points for libpthread.
+ Copyright (C) 2014-2016 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. */
+
+static __typeof (vfork) *
+__attribute__ ((used))
+vfork_resolve (void)
+{
+ return &__libc_vfork;
+}
+
+# ifdef HAVE_ASM_SET_DIRECTIVE
+# define DEFINE_VFORK(name) \
+ asm (".set " #name ", vfork_resolve\n" \
+ ".globl " #name "\n" \
+ ".type " #name ", %gnu_indirect_function");
+# else
+# define DEFINE_VFORK(name) \
+ asm (#name " = vfork_resolve\n" \
+ ".globl " #name "\n" \
+ ".type " #name ", %gnu_indirect_function");
+# endif
+#endif
+
+#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_20)
+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)
+DEFINE_VFORK (__vfork_ifunc)
+compat_symbol (libpthread, __vfork_ifunc, __vfork, GLIBC_2_1_2);
+#endif