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glibc/sysdeps/unix/sysv/linux/sys/sysmacros.h
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/* Definitions of macros to access `dev_t' values. | |
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 | |
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, write to the Free | |
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
02111-1307 USA. */ | |
#ifndef _SYS_SYSMACROS_H | |
#define _SYS_SYSMACROS_H 1 | |
#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 */ |