Consolidate Linux write syscall

This patch consolidates the write Linux syscall implementation on
sysdeps/unix/sysv/linux/write.c.

Checked on i686-linux-gnu, x86_64-linux-gnu, x86_64-linux-gnux32,
arch64-linux-gnu, arm-linux-gnueabihf, and powerpc64le-linux-gnu.

	* include/unistd.h (write): Add hidden proto.
	* io/Makefile (CFLAGS-write.c): New rule.
	* nptl/Makefile (CFLAGS-write.c): Likewise.
	* sysdeps/unix/sysv/linux/write.c: New file.

5 files changed, 41 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 1101834e04..19193464bd 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
 2016-05-10  Adhemerval Zanella  <adhemerval.zanella@linaro.org>
 
+	* include/unistd.h (write): Add hidden proto.
+	* io/Makefile (CFLAGS-write.c): New define.
+	* nptl/Makefile (CFLAGS-write.c): Likewise.
+	* sysdeps/unix/sysv/linux/write.c: New file.
+
 	[BZ #21428]
 	* include/unistd.h (read): Add hidden proto.
 	* io/Makefile (CFLAGS-read.c): New define.
diff --git a/include/unistd.h b/include/unistd.h
index 01556d3c7b..0cdf06e513 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -56,6 +56,7 @@ libc_hidden_proto (__libc_read)
 libc_hidden_proto (read)
 extern ssize_t __libc_write (int __fd, const void *__buf, size_t __n);
 libc_hidden_proto (__libc_write)
+libc_hidden_proto (write)
 extern int __pipe (int __pipedes[2]);
 libc_hidden_proto (__pipe)
 extern int __pipe2 (int __pipedes[2], int __flags);
diff --git a/io/Makefile b/io/Makefile
index db14c0dd82..16365e581a 100644
--- a/io/Makefile
+++ b/io/Makefile
@@ -101,6 +101,7 @@ CFLAGS-fallocate.c = -fexceptions
 CFLAGS-fallocate64.c = -fexceptions
 CFLAGS-sync_file_range.c = -fexceptions
 CFLAGS-read.c = -fexceptions
+CFLAGS-write.c = -fexceptions
 
 CFLAGS-test-stat.c = -D_FILE_OFFSET_BITS=64 -D_LARGEFILE64_SOURCE
 CFLAGS-test-lfs.c = -D_LARGEFILE64_SOURCE
diff --git a/nptl/Makefile b/nptl/Makefile
index faabd45fdb..5b34b5c225 100644
--- a/nptl/Makefile
+++ b/nptl/Makefile
@@ -215,6 +215,7 @@ CFLAGS-recvmsg.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-sendmsg.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-close.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-read.c = -fexceptions -fasynchronous-unwind-tables
+CFLAGS-write.c = -fexceptions -fasynchronous-unwind-tables
 
 CFLAGS-pt-system.c = -fexceptions
 
diff --git a/sysdeps/unix/sysv/linux/write.c b/sysdeps/unix/sysv/linux/write.c
new file mode 100644
index 0000000000..d49514502e
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/write.c
@@ -0,0 +1,33 @@
+/* Linux write syscall implementation.
+   Copyright (C) 2017 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 <sysdep-cancel.h>
+
+/* Write NBYTES of BUF to FD.  Return the number written, or -1.  */
+ssize_t
+__libc_write (int fd, const void *buf, size_t nbytes)
+{
+  return SYSCALL_CANCEL (write, fd, buf, nbytes);
+}
+libc_hidden_def (__libc_write)
+
+weak_alias (__libc_write, __write)
+libc_hidden_weak (__write)
+weak_alias (__libc_write, write)
+libc_hidden_weak (write)