[Feature][ZXW-33]merge ZXW 0428 version
Change-Id: I11f167edfea428d9fab198ff00ff1364932d1b0b
diff --git a/ap/libc/glibc/glibc-2.23/sysdeps/nacl/dl-writev.h b/ap/libc/glibc/glibc-2.23/sysdeps/nacl/dl-writev.h
new file mode 100644
index 0000000..bd50865
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/sysdeps/nacl/dl-writev.h
@@ -0,0 +1,45 @@
+/* Message-writing for the dynamic linker. NaCl version.
+ Copyright (C) 2015-2016 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 <sys/uio.h>
+#include <nacl-interfaces.h>
+
+/* This is used from only one place: dl-misc.c:_dl_debug_vdprintf.
+ Hence it's in a header with the expectation it will be inlined.
+
+ This is writev, but with a constraint added and others loosened:
+
+ 1. Under RTLD_PRIVATE_ERRNO, it must not clobber the private errno
+ when another thread holds the dl_load_lock.
+ 2. It is not obliged to detect and report errors at all.
+ 3. It's not really obliged to deliver a single atomic write
+ (though it may be preferable). */
+
+static inline void
+_dl_writev (int fd, const struct iovec *iov, size_t niov)
+{
+ for (size_t i = 0; i < niov; ++i)
+ {
+ size_t wrote;
+ if (__nacl_irt_fdio.write (fd, iov[i].iov_base, iov[i].iov_len,
+ &wrote) != 0
+ || wrote != iov[i].iov_len)
+ /* The write failed, so don't bother trying any more. */
+ break;
+ }
+}