/*
 * bauble: a tiny room-based messaging system
 *
 * mb.h: stuff of global importance to things that
 * manipulate messages
 */
#ifndef _MB_H
#define _MB_H

#include <fcntl.h>

#define MBMAGIC	(((unsigned long)('M'<<24))|\
		    ((unsigned long)'e'<<16)|\
		    ((unsigned long)'s'<<8)|\
		     (unsigned long)'g')

/*
 * superblock for a messagebase
 */
struct mbsb {
    unsigned long magic;	/* the appropriate magic number */
    char created_by[40];	/* what created this messageq */
    int  size;			/* # blocks in the messageq */
    int  catblk;		/* next block to write in */
    int  catidx;		/* next byte to write in */
    int  oldest;		/* oldest message in messageq */
    int  newest;		/* newest message in messageq */
} ;

#define	MBBLKSZ	1024		/* # bytes in each messagebase block */

extern int mbio();
extern int mbsuper();
extern int mbneed();
extern int mbopen();
extern int mbclose();

#define mbread(l,p)	mbio(read,l,p)
#define	mbwrite(l,p)	mbio(write,l,p)

#endif /*_MB_H*/