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Extended minor number to include bits 16-31. It was done this way rather

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than making it 16bit and extending the major to 16bit because doing that
would have caused problems with existing filesystems /dev entries. This
change should have no apparant side effects.
This change is needed for the DOS partition re-work and other things.

Submitted by:	Bruce Evans
This commit is contained in:
dg 1994-09-25 15:56:25 +00:00
parent 5a98555bdc
commit 97f509d39a
1 changed files with 7 additions and 2 deletions
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9
sys/sys/types.h
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@ -36,7 +36,7 @@
* SUCH DAMAGE.
*
* @(#)types.h 8.4 (Berkeley) 1/21/94
* $Id: types.h,v 1.2 1994/08/02 07:53:59 davidg Exp $
* $Id: types.h,v 1.3 1994/09/16 11:44:45 paul Exp $
*/
#ifndef _SYS_TYPES_H_
@ -86,8 +86,13 @@ __END_DECLS
#endif
#ifndef _POSIX_SOURCE
/*
* minor() gives a cookie instead of an index since we don't want to
* change the meanings of bits 0-15 or waste time and space shifting
* bits 16-31 for devices that don't use them.
*/
#define major(x) ((int)(((u_int)(x) >> 8)&0xff)) /* major number */
#define minor(x) ((int)((x)&0xff)) /* minor number */
#define minor(x) ((int)((x)&0xffff00ff)) /* minor number */
#define makedev(x,y) ((dev_t)(((x)<<8) | (y))) /* create dev_t */
#endif