/*
 * watcher.h 
 */
#ifndef NETSNMP_WATCHER_H
#define NETSNMP_WATCHER_H

#ifdef __cplusplus
extern "C" {
#endif

/*
 * if handler flag has this bit set, the timestamp will be
 * treated as a pointer to the timestamp. If this bit is
 * not set (the default), the timestamp is a struct timeval
 * that must be compared to the agent starttime.
 */
#define NETSNMP_WATCHER_DIRECT MIB_HANDLER_CUSTOM1

#define WATCHER_FIXED_SIZE    0x01
#define WATCHER_MAX_SIZE      0x02

typedef struct netsnmp_watcher_info_s {
    void     *data;
    size_t    data_size;
    size_t    max_size;
    u_char    type;
    int       flags;
} netsnmp_watcher_info;

int netsnmp_register_watched_instance( netsnmp_handler_registration *reginfo,
                                       netsnmp_watcher_info         *winfo);
int netsnmp_register_watched_scalar(   netsnmp_handler_registration *reginfo,
                                       netsnmp_watcher_info         *winfo);
int netsnmp_register_watched_timestamp(netsnmp_handler_registration *reginfo,
                                       marker_t timestamp);
int netsnmp_watched_timestamp_register(netsnmp_mib_handler *whandler,
                                       netsnmp_handler_registration *reginfo,
                                       marker_t timestamp);
int netsnmp_register_watched_spinlock(netsnmp_handler_registration *reginfo,
                                      int *spinlock);    

/*
 * Convenience registration calls
 */

int netsnmp_register_ulong_scalar(const char *name,
                              oid * reg_oid, size_t reg_oid_len,
                              u_long * it,
                              Netsnmp_Node_Handler * subhandler);
int netsnmp_register_read_only_ulong_scalar(const char *name,
                              oid * reg_oid, size_t reg_oid_len,
                              u_long * it,
                              Netsnmp_Node_Handler * subhandler);
int netsnmp_register_long_scalar(const char *name,
                              oid * reg_oid, size_t reg_oid_len,
                              long * it,
                              Netsnmp_Node_Handler * subhandler);
int netsnmp_register_read_only_long_scalar(const char *name,
                              oid * reg_oid, size_t reg_oid_len,
                              long * it,
                              Netsnmp_Node_Handler * subhandler);
int netsnmp_register_int_scalar(const char *name,
                              oid * reg_oid, size_t reg_oid_len,
                              int * it,
                              Netsnmp_Node_Handler * subhandler);
int netsnmp_register_read_only_int_scalar(const char *name,
                              oid * reg_oid, size_t reg_oid_len,
                              int * it,
                              Netsnmp_Node_Handler * subhandler);
int netsnmp_register_read_only_counter32_scalar(const char *name,
                              oid * reg_oid, size_t reg_oid_len,
                              u_long * it,
                              Netsnmp_Node_Handler * subhandler);

#define WATCHER_HANDLER_NAME "watcher"

netsnmp_mib_handler  *netsnmp_get_watcher_handler(void);
netsnmp_watcher_info *netsnmp_create_watcher_info(void *, size_t, u_char, int);
Netsnmp_Node_Handler  netsnmp_watcher_helper_handler;

netsnmp_mib_handler  *netsnmp_get_watched_timestamp_handler(void);
Netsnmp_Node_Handler  netsnmp_watched_timestamp_handler;

netsnmp_mib_handler  *netsnmp_get_watched_spinlock_handler(void);
Netsnmp_Node_Handler  netsnmp_watched_spinlock_handler;

#ifdef __cplusplus
}
#endif

#endif /** NETSNMP_WATCHER_H */