1 jelson 1.1 /*
 2             * EMLOG: the EMbedded-device LOGger
 3             *
 4             * Jeremy Elson
 5             * USC/ISI
 6             *

 7 jelson 1.2  * $Id: emlog.h,v 1.1 2000/06/06 09:11:13 jelson Exp $

 8 jelson 1.1  */
 9            
10            #define EMLOG_MAJOR_NUMBER   241
11            #define EMLOG_MAX_SIZE       128 /* max size in kilobytes of a buffer */
12            
13            
14            /************************ Private Definitions *****************************/
15            
16            struct emlog_info {
17              unsigned long i_ino;

18 jelson 1.2 
19            
20            #if defined(DECLARE_WAIT_QUEUE_HEAD)
21              wait_queue_head_t read_q;
22            #else
23              struct wait_queue *my_wait_queue;
24            #endif

25 jelson 1.1   
26              int refcount;
27              int read_point, write_point;
28              int size;
29              char *data;
30              struct emlog_info *next;
31            };
32            
33            #define EMLOG_EMPTY(einfo) (((einfo)->read_point) == ((einfo)->write_point))
34            #define EMLOG_SIZE(einfo) ( (einfo)->write_point >= (einfo)->read_point ? \
35                     (einfo)->write_point - (einfo)->read_point : \
36                     (einfo)->size - (einfo)->read_point + (einfo)->write_point)
37            			
38            #define EMLOG_REFCOUNT(einfo) ((einfo)->refcount)

39 jelson 1.2 #define EMLOG_READQ(einfo) (&((einfo)->read_q))

40 jelson 1.1