[Feature][ZXW-33]merge ZXW 0428 version
Change-Id: I11f167edfea428d9fab198ff00ff1364932d1b0b
diff --git a/ap/libc/glibc/glibc-2.23/sysdeps/posix/pwritev.c b/ap/libc/glibc/glibc-2.23/sysdeps/posix/pwritev.c
new file mode 100644
index 0000000..8c483f1
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/sysdeps/posix/pwritev.c
@@ -0,0 +1,95 @@
+/* Copyright (C) 2009-2016 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 <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <limits.h>
+#include <stdbool.h>
+#include <sys/param.h>
+#if __WORDSIZE == 64 && !defined PWRITEV
+/* Hide the pwritev64 declaration. */
+# define pwritev64 __redirect_pwritev64
+#endif
+#include <sys/uio.h>
+#include <bits/wordsize.h>
+
+#ifndef PWRITEV
+# define PWRITEV pwritev
+# define PWRITE __pwrite
+# define OFF_T off_t
+#endif
+
+
+static void
+ifree (char **ptrp)
+{
+ free (*ptrp);
+}
+
+
+/* Write data pointed by the buffers described by IOVEC, which is a
+ vector of COUNT 'struct iovec's, to file descriptor FD at the given
+ position OFFSET without change the file pointer. The data is
+ written in the order specified. Operates just like 'write' (see
+ <unistd.h>) except that the data are taken from IOVEC instead of a
+ contiguous buffer. */
+ssize_t
+PWRITEV (int fd, const struct iovec *vector, int count, OFF_T offset)
+{
+ /* Find the total number of bytes to be read. */
+ size_t bytes = 0;
+ for (int i = 0; i < count; ++i)
+ {
+ /* Check for ssize_t overflow. */
+ if (SSIZE_MAX - bytes < vector[i].iov_len)
+ {
+ __set_errno (EINVAL);
+ return -1;
+ }
+ bytes += vector[i].iov_len;
+ }
+
+ /* Allocate a temporary buffer to hold the data. We should normally
+ use alloca since it's faster and does not require synchronization
+ with other threads. But we cannot if the amount of memory
+ required is too large. */
+ char *buffer;
+ char *malloced_buffer __attribute__ ((__cleanup__ (ifree))) = NULL;
+ if (__libc_use_alloca (bytes))
+ buffer = (char *) __alloca (bytes);
+ else
+ {
+ malloced_buffer = buffer = (char *) malloc (bytes);
+ if (buffer == NULL)
+ return -1;
+ }
+
+ /* Copy the data from BUFFER into the memory specified by VECTOR. */
+ char *ptr = buffer;
+ for (int i = 0; i < count; ++i)
+ ptr = __mempcpy ((void *) ptr, (void *) vector[i].iov_base,
+ vector[i].iov_len);
+
+ /* Write the data. */
+ return PWRITE (fd, buffer, bytes, offset);
+}
+#if __WORDSIZE == 64 && defined pwritev64
+# undef pwritev64
+strong_alias (pwritev, pwritev64)
+#endif