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* sysdeps/unix/sysv/linux/sys/sysmacros.h: Adjust for larger
	kernel dev_t size.
	* sysdeps/unix/sysv/linux/makedev.c: New file.
	* sysdeps/unix/sysv/linux/Dist: Add makedev.c.
	* sysdeps/unix/sysv/linux/Makefile [subdir=misc]
	(sysdep_routines): Add makedev.
	* sysdeps/unix/sysv/linux/Versions [libc] (GLIBC_2.3.3): Add
	major, minor, makedev.

2003-09-23  Ulrich Drepper  <drepper@redhat.com>
This commit is contained in:
Ulrich Drepper
2003-09-24 05:05:38 +00:00
parent 54ee14b388
commit 9a276f8e1e
6 changed files with 95 additions and 24 deletions
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61
sysdeps/unix/sysv/linux/sys/sysmacros.h
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@ -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 +20,45 @@
#ifndef _SYS_SYSMACROS_H
#define _SYS_SYSMACROS_H 1
/* For compatibility we provide alternative names.
#include <features.h>
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 }
/* 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
extern unsigned int inline major (unsigned long long int __dev) __THROW;
extern unsigned int inline minor (unsigned long long int __dev) __THROW;
extern unsigned long long int inline makedev (unsigned int __major,
unsigned int __minor) __THROW;
# if defined __GNUC__ && __GNUC__ >= 2
extern inline unsigned int
major (unsigned long long int __dev)
{
return ((__dev >> 8) & 0xfff) | ((unsigned int) (__dev >> 32) & ~0xfff);
}
extern inline unsigned int
minor (unsigned long long int __dev)
{
return (__dev & 0xff) | ((unsigned int) (__dev >> 12) & ~0xff);
}
extern inline unsigned long long int
makedev (unsigned int __major, unsigned int __minor)
{
return ((__minor & 0xff) | ((__major & 0xfff) << 8)
| (((unsigned long long int) (__minor & ~0xff)) << 12)
| (((unsigned long long int) (__major & ~0xfff)) << 32));
}
# endif
/* Historically the three symbols were macros. In case some programs
use #ifdef to check for definition provide some dummy macros. */
# define major(dev) major (dev)
# define minor(dev) minor (dev)
# define makedev(maj, min) makedev (maj, min)
#endif
#endif /* sys/sysmacros.h */