/* Definitions of macros to access `dev_t' values. Copyright (C) 1996, 1997, 1999 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 /* 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 } # endif #endif #endif /* sys/sysmacros.h */