linux: Add generic ioctl implementation

The powerpc is refactor to use the default implementation.

sysdeps/unix/sysv/linux/powerpc/internal-ioctl.h

@@ -0,0 +1,48 @@
+/* Linux internal definitions for ioctl.
+   Copyright (C) 2021 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
+   <https://www.gnu.org/licenses/>.  */
+
+#include <termios.h>
+
+/* The user-visible size of struct termios has changed.  Catch ioctl calls
+   using the new-style struct termios, and translate them to old-style.  */
+static inline bool
+__ioctl_arch (int *r, int fd, unsigned long request, void *arg)
+{
+  switch (request)
+    {
+    case TCGETS:
+      *r = __tcgetattr (fd, (struct termios *) arg);
+      break;
+
+    case TCSETS:
+      *r = __tcsetattr (fd, TCSANOW, (struct termios *) arg);
+      break;
+
+    case TCSETSW:
+      *r = __tcsetattr (fd, TCSADRAIN, (struct termios *) arg);
+      break;
+
+    case TCSETSF:
+      *r = __tcsetattr (fd, TCSAFLUSH, (struct termios *) arg);
+      break;
+
+    default:
+      return false;
+    }
+  return true;
+}