Consolidate pwritev/pwritev64 implementations

This patch consolidates all the pwritev{64} implementation for Linux
in only one (sysdeps/unix/sysv/linux/pwritev{64}.c).  It also removes the
syscall from the auto-generation using assembly macros.

It was based on previous pwrite/pwrite64 consolidation patch.  The new macro
SYSCALL_LL{64} is used to handle the offset argument and alias is created
for __ASSUME_OFF_DIFF_OFF64 in case of pread64.

Checked on x86_64, i386, aarch64, and powerpc64le.

	* misc/Makefile (CFLAGS-pwritev.c): New variable: add cancellation
	required flags.
	(CFLAGS-pwritev64.c): Likewise.
	* sysdeps/unix/sysv/linux/generic/wordsize-32/pwritev.c: Remove file.
	* sysdeps/unix/sysv/linux/generic/wordsize-32/pwritev64.c: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/n64/pwritev64.c: Likewise.
	* sysdeps/unix/sysv/linux/wordsize-64/pwritev.c: Likewise.
	* sysdeps/unix/sysv/linux/wordsize-64/pwritev64.: Likwise.
	* sysdeps/unix/sysv/linux/x86_64/x32/syscalls.list (pwritev): Remove
	syscall from auto-generation.
	* sysdeps/unix/sysv/linux/pwritev.c: Rewrite implementation.
	[WORDSIZE == 64] (pwritev64): Remove macro.
	[!PWRITEV] (PWRITEV): Likewise.
	[!PWRITEV] (PWRITEV_REPLACEMENT): Likewise.
	[!PWRITEV] (PWRITE): Likewise.
	[!PWRITEV] (OFF_T): Likewise.
	[!__ASSUME_PWRITEV] (PWRITEV_REPLACEMENT): Likewise.
	(LO_HI_LONG): Remove macro.
	[__WORDSIZE != 64 || __ASSUME_OFF_DIFF_OFF64] (pwritev): Add function.
	* sysdeps/unix/sysv/linux/pwritev64.c: Rewrite implementation.
	(PWRITEV): Remove macro.
	(PWRITEV_REPLACEMENTE): Likewise.
	(PWRITE): Likewise.
	(OFF_T): Likewise.
	(pwritev64): New function.
	* nptl/tst-cancel4.c (tf_writev): Add test.

1 files changed, 54 insertions, 5 deletions

diff --git a/sysdeps/unix/sysv/linux/pwritev64.c b/sysdeps/unix/sysv/linux/pwritev64.c
index 1e8168f..bed79b7 100644
--- a/sysdeps/unix/sysv/linux/pwritev64.c
+++ b/sysdeps/unix/sysv/linux/pwritev64.c
@@ -1,6 +1,55 @@
-#define PWRITEV pwritev64
-#define PWRITEV_REPLACEMENT __atomic_pwritev64_replacement
-#define PWRITE __pwrite64
-#define OFF_T off64_t
+/* Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
 
-#include "pwritev.c"
+   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 <sysdep-cancel.h>
+
+#ifdef __ASSUME_PWRITEV
+
+# ifndef __NR_pwritev64
+#  define __NR_pwritev64 __NR_pwritev
+# endif
+
+ssize_t
+pwritev64 (int fd, const struct iovec *vector, int count, off64_t offset)
+{
+  return SYSCALL_CANCEL (pwritev64, fd, vector, count,
+			 __ALIGNMENT_ARG SYSCALL_LL64 (offset));
+}
+#else
+static ssize_t __atomic_pwritev64_replacement (int, const struct iovec *,
+					       int, off64_t) internal_function;
+ssize_t
+pwritev64 (int fd, const struct iovec *vector, int count, off64_t offset)
+{
+#ifdef __NR_pwrite64v
+  ssize_t result = SYSCALL_CANCEL (pwritev64, fd, vector, count,
+				   __ALIGNMENT_ARG SYSCALL_LL64 (offset));
+  if (result >= 0 || errno != ENOSYS)
+    return result;
+#endif
+  return __atomic_pwritev64_replacement (fd, vector, count, offset);
+}
+# define PWRITEV static internal_function __atomic_pwritev64_replacement
+# define PWRITE __pwrite64
+# define OFF_T off64_t
+# include <sysdeps/posix/pwritev.c>
+#endif
+
+#if __WORDSIZE == 64 && !defined (__ASSUME_OFF_DIFF_OFF64)
+strong_alias (pwritev64, pwritev)
+#endif