Consolidate Linux creat implementation

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

  1. Remove creat{64} from auto-generation syscalls.list.
  2. Add a new creat{64}.c implementation.  For architectures that
     define __OFF_T_MATCHES_OFF64_T the default creat64 will create
     alias to required creat symbols.
  3. Use __NR_creat where possible, otherwise use internal open{64}
     call with expected flags.

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

	* io/Makefile (CFLAGS-creat.c): New rule.
	(CFLAGS-creat64.c): Likewise.
	* sysdeps/unix/sysv/linux/alpha/creat.c: Remove file.
	* sysdeps/unix/sysv/linux/generic/creat.c: Likewise.
	* sysdeps/unix/sysv/linux/wordsize-64/creat64.c: Likewise.
	* sysdeps/unix/sysv/linux/creat.c: New file.
	* sysdeps/unix/sysv/linux/creat64.c: Likewise.
	* sysdeps/unix/sysv/linux/syscalls.list: Remove create from
	auto-generated list.
	* sysdeps/unix/sysv/linux/wordsize-64/syscalls.list: Likewise.

ChangeLog

@@ -1,5 +1,16 @@
 2016-05-10  Adhemerval Zanella  <adhemerval.zanella@linaro.org>
 
+	* io/Makefile (CFLAGS-creat.c): New rule.
+	(CFLAGS-creat64.c): Likewise.
+	* sysdeps/unix/sysv/linux/alpha/creat.c: Remove file.
+	* sysdeps/unix/sysv/linux/generic/creat.c: Likewise.
+	* sysdeps/unix/sysv/linux/wordsize-64/creat64.c: Likewise.
+	* sysdeps/unix/sysv/linux/creat.c: New file.
+	* sysdeps/unix/sysv/linux/creat64.c: Likewise.
+	* sysdeps/unix/sysv/linux/syscalls.list: Remove create from
+	auto-generated list.
+	* sysdeps/unix/sysv/linux/wordsize-64/syscalls.list: Likewise.
+
 	* 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.

io/Makefile

@@ -80,6 +80,8 @@ include ../Rules
 
 CFLAGS-open.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-open64.c = -fexceptions -fasynchronous-unwind-tables
+CFLAGS-creat.c = -fexceptions -fasynchronous-unwind-tables
+CFLAGS-creat64.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-fcntl.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-poll.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-ppoll.c = -fexceptions -fasynchronous-unwind-tables

sysdeps/unix/sysv/linux/alpha/creat.c

@@ -1,8 +0,0 @@
-/* sysdeps/unix/sysv/linux/wordsize-64/syscalls.list defines creat and
-   creat64 for most linux targets, but on alpha creat is not a syscall.
-   If we do nothing, we'll wind up with creat64 being undefined, because
-   the syscalls.list assumes the creat->creat64 alias was created.  We
-   could have overridden that with a create64.c, but we might as well do
-   the right thing and set up creat64 as an alias.  */
-#include <io/creat.c>
-weak_alias(creat, creat64)

sysdeps/unix/sysv/linux/creat.c

@@ -1,6 +1,6 @@
-/* Copyright (C) 2011-2017 Free Software Foundation, Inc.
+/* Linux default implementation for creat.
+   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
@@ -18,20 +18,23 @@
 
 #include <fcntl.h>
 #include <sys/types.h>
+
 #include <sysdep-cancel.h>
 
-#undef	creat
+#ifndef __OFF_T_MATCHES_OFF64_T
 
 /* Create FILE with protections MODE.  */
 int
-creat (const char *file, mode_t mode)
+__creat (const char *file, mode_t mode)
 {
+# ifdef __NR_creat
+  return SYSCALL_CANCEL (creat, file, mode);
+# else
   return __open (file, O_WRONLY | O_CREAT | O_TRUNC, mode);
+# endif
 }
+weak_alias (__creat, creat)
 
-/* __open handles cancellation.  */
 LIBC_CANCEL_HANDLED ();
 
-#if __WORDSIZE == 64
-weak_alias (creat, creat64)
 #endif

sysdeps/unix/sysv/linux/creat64.c

@@ -0,0 +1,41 @@
+/* Linux default implementation for LFS creat.
+   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 <fcntl.h>
+#include <sys/types.h>
+#include <sysdep-cancel.h>
+
+/* Create FILE with protections MODE.  */
+int
+__creat64 (const char *file, mode_t mode)
+{
+#if defined __OFF_T_MATCHES_OFF64_T && defined __NR_creat
+  return SYSCALL_CANCEL (creat, file, mode);
+#else
+  /* We need to pass O_LARGEFILE.  */
+  return __open64 (file, O_WRONLY | O_CREAT | O_TRUNC, mode);
+#endif
+}
+weak_alias (__creat64, creat64)
+
+#ifdef __OFF_T_MATCHES_OFF64_T
+strong_alias (__creat64, __creat)
+weak_alias (__creat64, creat)
+#endif
+
+LIBC_CANCEL_HANDLED ();

sysdeps/unix/sysv/linux/syscalls.list

@@ -6,7 +6,6 @@ bdflush		EXTRA	bdflush		i:ii	__compat_bdflush	bdflush@GLIBC_2.0:GLIBC_2.23
 capget		EXTRA	capget		i:pp	capget
 capset		EXTRA	capset		i:pp	capset
 clock_adjtime	EXTRA	clock_adjtime	i:ip	clock_adjtime
-creat		-	creat		Ci:si	creat
 create_module	EXTRA	create_module	3	__compat_create_module	create_module@GLIBC_2.0:GLIBC_2.23
 delete_module	EXTRA	delete_module	3	delete_module
 epoll_create	EXTRA	epoll_create	i:i	epoll_create

sysdeps/unix/sysv/linux/wordsize-64/creat64.c

@@ -1 +0,0 @@
-/* Defined as alias for the syscall.  */

sysdeps/unix/sysv/linux/wordsize-64/syscalls.list

@@ -5,7 +5,6 @@ statfs		-	statfs		i:sp	__statfs	statfs statfs64
 readahead	-	readahead	i:iii	__readahead	readahead
 sendfile	-	sendfile	i:iipi	sendfile	sendfile64
 sync_file_range	-	sync_file_range	Ci:iiii	sync_file_range
-creat		-	creat		Ci:si	creat		creat64
 prlimit		EXTRA	prlimit64	i:iipp	prlimit		prlimit64
 
 fanotify_mark	EXTRA	fanotify_mark	i:iiiis	fanotify_mark