hurd: Add renameat2 support for RENAME_NOREPLACE

* include/stdio.h (__renameat2): New hidden prototype.
	* stdio-common/renameat2.c (__renameat2): Add hidden definition.
	* sysdeps/mach/hurd/renameat.c (__renameat): Move implementation to...
	* sysdeps/mach/hurd/renameat2.c (__renameat2): ... new function, and
	add support for RENAME_NOREPLACE.
	* sysdeps/unix/sysv/linux/renameat2.c (__renameat2): Add hidden definition.

ChangeLog

@@ -1,3 +1,11 @@
+2019-02-27  Samuel Thibault  <samuel.thibault@ens-lyon.org>
+
+	* include/stdio.h (__renameat2): New hidden prototype.
+	* stdio-common/renameat2.c (__renameat2): Add hidden definition.
+	* sysdeps/mach/hurd/renameat.c (__renameat): Move implementation to...
+	* sysdeps/mach/hurd/renameat2.c (__renameat2): ... new function.
+	* sysdeps/unix/sysv/linux/renameat2.c (__renameat2): Add hidden definition.
+
 2019-02-27  Joseph Myers  <joseph@codesourcery.com>
 
 	* hurd/hurdinit.c (_hurd_init): Use braces around empty body of an

include/stdio.h

@@ -261,6 +261,8 @@ __putc_unlocked (int __c, FILE *__stream)
 
 extern __typeof (renameat) __renameat;
 libc_hidden_proto (__renameat)
+extern __typeof (renameat2) __renameat2;
+libc_hidden_proto (__renameat2)
 
 # endif /* not _ISOMAC */
 #endif /* stdio.h */

stdio-common/renameat2.c

@@ -20,7 +20,7 @@
 #include <stdio.h>
 
 int
-renameat2 (int oldfd, const char *old, int newfd, const char *new,
+__renameat2 (int oldfd, const char *old, int newfd, const char *new,
            unsigned int flags)
 {
   if (flags == 0)
@@ -28,3 +28,5 @@ renameat2 (int oldfd, const char *old, int newfd, const char *new,
   __set_errno (EINVAL);
   return -1;
 }
+libc_hidden_def (__renameat2)
+weak_alias (__renameat2, renameat2)

sysdeps/mach/hurd/renameat.c

@@ -24,26 +24,7 @@
 int
 __renameat (int oldfd, const char *old, int newfd, const char *new)
 {
-  error_t err;
+  return __renameat2 (oldfd, old, newfd, new, 0);
-  file_t olddir, newdir;
-  const char *oldname, *newname;
-
-  olddir = __directory_name_split_at (oldfd, old, (char **) &oldname);
-  if (olddir == MACH_PORT_NULL)
-    return -1;
-  newdir = __directory_name_split_at (newfd, new, (char **) &newname);
-  if (newdir == MACH_PORT_NULL)
-    {
-       __mach_port_deallocate (__mach_task_self (), olddir);
-      return -1;
-    }
-
-  err = __dir_rename (olddir, oldname, newdir, newname, 0);
-  __mach_port_deallocate (__mach_task_self (), olddir);
-  __mach_port_deallocate (__mach_task_self (), newdir);
-  if (err)
-    return __hurd_fail (err);
-  return 0;
 }
 libc_hidden_def (__renameat)
 weak_alias (__renameat, renameat)

sysdeps/mach/hurd/renameat2.c

@@ -0,0 +1,56 @@
+/* Rename a file using relative source and destination names.  Hurd version.
+   Copyright (C) 1991-2019 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 <stdio.h>
+#include <hurd.h>
+#include <hurd/fd.h>
+
+/* Rename the file OLD relative to OLDFD to NEW relative to NEWFD.  */
+int
+__renameat2 (int oldfd, const char *old, int newfd, const char *new,
+             unsigned int flags)
+{
+  error_t err;
+  file_t olddir, newdir;
+  const char *oldname, *newname;
+  int excl = 0;
+
+  if (flags & (RENAME_EXCHANGE | RENAME_WHITEOUT))
+    return __hurd_fail (ENOSYS);
+  if (flags & RENAME_NOREPLACE)
+    excl = 1;
+
+  olddir = __directory_name_split_at (oldfd, old, (char **) &oldname);
+  if (olddir == MACH_PORT_NULL)
+    return -1;
+  newdir = __directory_name_split_at (newfd, new, (char **) &newname);
+  if (newdir == MACH_PORT_NULL)
+    {
+       __mach_port_deallocate (__mach_task_self (), olddir);
+      return -1;
+    }
+
+  err = __dir_rename (olddir, oldname, newdir, newname, excl);
+  __mach_port_deallocate (__mach_task_self (), olddir);
+  __mach_port_deallocate (__mach_task_self (), newdir);
+  if (err)
+    return __hurd_fail (err);
+  return 0;
+}
+libc_hidden_def (__renameat2)
+weak_alias (__renameat2, renameat2)

sysdeps/unix/sysv/linux/renameat2.c

@@ -21,7 +21,7 @@
 #include <sysdep.h>
 
 int
-renameat2 (int oldfd, const char *old, int newfd, const char *new,
+__renameat2 (int oldfd, const char *old, int newfd, const char *new,
            unsigned int flags)
 {
 #if !defined (__NR_renameat) || defined (__ASSUME_RENAMEAT2)
@@ -42,3 +42,5 @@ renameat2 (int oldfd, const char *old, int newfd, const char *new,
   return -1;
 #endif
 }
+libc_hidden_def (__renameat2)
+weak_alias (__renameat2, renameat2)