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authorEric Andersen <andersen@codepoet.org>2004-07-26 12:36:24 +0000
committerEric Andersen <andersen@codepoet.org>2004-07-26 12:36:24 +0000
commitbbc38aa49830c9377e5087a2294c9378448d5ca5 (patch)
treed9edb4624034f6fb098242b85ead2d26f5e29349 /include/sys/sysmacros.h
parent44b24a7a32372081048cb1d5a86f9b7c3ce59a43 (diff)
Support linux 2.6.x wide device major/minor numbers
Diffstat (limited to 'include/sys/sysmacros.h')
-rw-r--r--include/sys/sysmacros.h68
1 files changed, 44 insertions, 24 deletions
diff --git a/include/sys/sysmacros.h b/include/sys/sysmacros.h
index e482aab17..a9bfa78d3 100644
--- a/include/sys/sysmacros.h
+++ b/include/sys/sysmacros.h
@@ -1,5 +1,5 @@
/* Definitions of macros to access `dev_t' values.
- Copyright (C) 1996, 1997, 1999 Free Software Foundation, Inc.
+ Copyright (C) 1996, 1997, 1999, 2003 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
@@ -20,30 +20,50 @@
#ifndef _SYS_SYSMACROS_H
#define _SYS_SYSMACROS_H 1
-/* For compatibility we provide alternative names.
-
- The problem here is that compilers other than GCC probably don't
- have the `long long' type and so `dev_t' is actually an array. */
-#if defined __GNUC__ && __GNUC__ >= 2
-# define major(dev) ((int)(((dev) >> 8) & 0xff))
-# define minor(dev) ((int)((dev) & 0xff))
-# define makedev(major, minor) ((((unsigned int) (major)) << 8) \
- | ((unsigned int) (minor)))
-#else
-/* We need to know the word order here. This assumes that the word order
- is consistent with the byte order. */
-# include <endian.h>
-# if __BYTE_ORDER == __BIG_ENDIAN
-# define major(dev) (((dev).__val[1] >> 8) & 0xff)
-# define minor(dev) ((dev).__val[1] & 0xff)
-# define makedev(major, minor) { 0, ((((unsigned int) (major)) << 8) \
- | ((unsigned int) (minor))) }
-# else
-# define major(dev) (((dev).__val[0] >> 8) & 0xff)
-# define minor(dev) ((dev).__val[0] & 0xff)
-# define makedev(major, minor) { ((((unsigned int) (major)) << 8) \
- | ((unsigned int) (minor))), 0 }
+#include <features.h>
+
+/* If the compiler does not know long long it is out of luck. We are
+ not going to hack weird hacks to support the dev_t representation
+ they need. */
+#ifdef __GLIBC_HAVE_LONG_LONG
+__extension__
+extern __inline unsigned int gnu_dev_major (unsigned long long int __dev)
+ __THROW;
+__extension__
+extern __inline unsigned int gnu_dev_minor (unsigned long long int __dev)
+ __THROW;
+__extension__
+extern __inline unsigned long long int gnu_dev_makedev (unsigned int __major,
+ unsigned int __minor)
+ __THROW;
+
+# if defined __GNUC__ && __GNUC__ >= 2
+__extension__ extern __inline unsigned int
+gnu_dev_major (unsigned long long int __dev) __THROW
+{
+ return ((__dev >> 8) & 0xfff) | ((unsigned int) (__dev >> 32) & ~0xfff);
+}
+
+__extension__ extern __inline unsigned int
+gnu_dev_minor (unsigned long long int __dev) __THROW
+{
+ return (__dev & 0xff) | ((unsigned int) (__dev >> 12) & ~0xff);
+}
+
+__extension__ extern __inline unsigned long long int
+gnu_dev_makedev (unsigned int __major, unsigned int __minor) __THROW
+{
+ return ((__minor & 0xff) | ((__major & 0xfff) << 8)
+ | (((unsigned long long int) (__minor & ~0xff)) << 12)
+ | (((unsigned long long int) (__major & ~0xfff)) << 32));
+}
# endif
+
+
+/* Access the functions with their traditional names. */
+# define major(dev) gnu_dev_major (dev)
+# define minor(dev) gnu_dev_minor (dev)
+# define makedev(maj, min) gnu_dev_makedev (maj, min)
#endif
#endif /* sys/sysmacros.h */