#include <netinet/in.h>

#define MODIFICATION 1 // file written to 
#define DELETION 2 // file monitored is deleted
#define ATTRIB_CHANGE 4 // attributes of file change


struct watch {
    struct in_addr ipaddress; // remote ip
    int port; //remote port
    char *pathname; //file to be watched
};
typedef struct watch watch_t;

// file change handler will be called 
// when an event happens
// with parameters: watch details and the 
// event that occurred  on that watch
typedef void (*filechangehandler_t)(watch_t, int);

// takes a list of watches and a bitwise OR 
// of the events to watch (the events can be MODIFICATION, 
// DELETION, and/or ATTRIB_CHANGE). It also takes the callback 
// function which will be called when the watched file changes
// returns a process scoped unique id for the watch or -1 on error
// On error no watch will be started and parameter watches will point to 
// the watch that caused the error
int register_distributed_watch(watch_t** watches, int no_of_watches,
           int events_mask, filechangehandler_t filechangehandler);

// removes a distributed watch by watchid
// returns 0 if ok, -1 on error 
int distributed_unwatch(int watchid);