Consolidate Linux open implementation

This patch consolidates the open Linux syscall implementation on
sysdeps/unix/sysv/linux/open{64}.c.  The changes are:

  1. Remove open{64} from auto-generation syscalls.list.
  2. Add a new open{64}.c implementation.  For architectures that
     define __OFF_T_MATCHES_OFF64_T the default open64 will create
     alias to required open symbols.
  3. Use __NR_openat as default syscall for open{64}.

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

	* sysdeps/unix/sysv/linux/generic/open.c: Remove file.
	* sysdeps/unix/sysv/linux/generic/open64.c: Likewise.
	* sysdeps/unix/sysv/linux/wordsize-64/open64.c: Likewise.
	* sysdeps/unix/sysv/linux/open.c: New file.
	* sysdeps/unix/sysv/linux/open64.c (__libc_open64): Use O_LARGEFILE
	only for __OFF_T_MATCHES_OFF64_T and add alias to open if the case.
	* sysdeps/unix/sysv/linux/wordsize-64/syscalls.list: Remove open
	from auto-generated list.

1 files changed, 51 insertions, 0 deletions

diff --git a/sysdeps/unix/sysv/linux/open.c b/sysdeps/unix/sysv/linux/open.c
new file mode 100644
index 0000000000..b3912d5554
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/open.c
@@ -0,0 +1,51 @@
+/* Copyright (C) 2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
+
+   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/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdarg.h>
+
+#include <sysdep-cancel.h>
+
+#ifndef __OFF_T_MATCHES_OFF64_T
+
+/* Open FILE with access OFLAG.  If O_CREAT or O_TMPFILE is in OFLAG,
+   a third argument is the file protection.  */
+int
+__libc_open (const char *file, int oflag, ...)
+{
+  int mode = 0;
+
+  if (__OPEN_NEEDS_MODE (oflag))
+    {
+      va_list arg;
+      va_start (arg, oflag);
+      mode = va_arg (arg, int);
+      va_end (arg);
+    }
+
+  return SYSCALL_CANCEL (openat, AT_FDCWD, file, oflag, mode);
+}
+libc_hidden_def (__libc_open)
+
+weak_alias (__libc_open, __open)
+libc_hidden_weak (__open)
+weak_alias (__libc_open, open)
+
+#endif