hurd: Add system-specific sysmacros.h

* sysdeps/mach/hurd/bits/sysmacros.h: New file.

ChangeLog

@@ -1,3 +1,7 @@
+2017-08-27  Samuel Thibault  <samuel.thibault@ens-lyon.org>
+
+	* sysdeps/mach/hurd/bits/sysmacros.h: New file.
+
 2017-08-25  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* sysdeps/x86/cpu-features.h [__ASSEMBLER__]

sysdeps/mach/hurd/bits/sysmacros.h

@@ -0,0 +1,60 @@
+/* Definitions of macros to access `dev_t' values.  Hurd version.
+   Copyright (C) 1996-2017 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/>.  */
+
+#ifndef _BITS_SYSMACROS_H
+#define _BITS_SYSMACROS_H 1
+
+#ifndef _SYS_SYSMACROS_H
+# error "Never include <bits/sysmacros.h> directly; use <sys/sysmacros.h> instead."
+#endif
+
+/* The Hurd version of dev_t in glibc is a 32-bit quantity, with 8-bit
+   major and 24-bit minor numbers.  The encoding is mmmmMMmm, where M is a
+   hex digit of the major number and m is a hex digit of the minor number.  */
+
+#define __SYSMACROS_DECLARE_MAJOR(DECL_TEMPL)                   \
+  DECL_TEMPL(unsigned int, major, (__dev_t __dev))
+
+#define __SYSMACROS_DEFINE_MAJOR(DECL_TEMPL)                    \
+  __SYSMACROS_DECLARE_MAJOR (DECL_TEMPL)                        \
+  {                                                             \
+    return ((__dev & (__dev_t) 0x0000ff00u) >> 8);              \
+  }
+
+#define __SYSMACROS_DECLARE_MINOR(DECL_TEMPL)                   \
+  DECL_TEMPL(unsigned int, minor, (__dev_t __dev))
+
+#define __SYSMACROS_DEFINE_MINOR(DECL_TEMPL)                    \
+  __SYSMACROS_DECLARE_MINOR (DECL_TEMPL)                        \
+  {                                                             \
+    return (__dev & (__dev_t) 0xffff00ff);                      \
+  }
+
+#define __SYSMACROS_DECLARE_MAKEDEV(DECL_TEMPL)                 \
+  DECL_TEMPL(__dev_t, makedev, (unsigned int __major, unsigned int __minor))
+
+#define __SYSMACROS_DEFINE_MAKEDEV(DECL_TEMPL)                  \
+  __SYSMACROS_DECLARE_MAKEDEV (DECL_TEMPL)                      \
+  {                                                             \
+    __dev_t __dev;                                              \
+    __dev  = (((__dev_t) (__major & 0x000000ffu)) << 8);        \
+    __dev |= (((__dev_t) (__minor & 0xffff00ffu)) << 0);        \
+    return __dev;                                               \
+  }
+
+#endif /* bits/sysmacros.h */