/*
 #########################################################
 #  monitor dir or file change.
 #  cc -o mdir -I. mdir.c
 #  Flydragon ( ipv6china at comsenz dot com )
 #########################################################
*/
#include<linux/unistd.h>
#include<linux/inotify.h>
#include<errno.h>
#ifndef __NR_inotify_init
#if defined(__i386__)
#define __NR_inotify_init      291
#define __NR_inotify_add_watch 292
#define __NR_inotify_rm_watch  293
#endif
#endif
_syscall0(int, inotify_init)
_syscall3(int, inotify_add_watch, int, fd, const char *, path, __u32, mask)
_syscall2(int, inotify_rm_watch, int, fd, __u32, mask)

#define MAX_BUF_SIZE 1024
#define EVENT_NUM 16

#define IN_ACCESS       0x00000001  /* File was accessed */
#define IN_MODIFY       0x00000002  /* File was modified */
#define IN_ATTRIB       0x00000004  /* Metadata changed */
#define IN_CLOSE_WRITE      0x00000008  /* Writtable file was closed */
#define IN_CLOSE_NOWRITE    0x00000010  /* Unwrittable file closed */
#define IN_OPEN         0x00000020  /* File was opened */
#define IN_MOVED_FROM       0x00000040  /* File was moved from X */
#define IN_MOVED_TO     0x00000080  /* File was moved to Y */
#define IN_CREATE       0x00000100  /* Subfile was created */
#define IN_DELETE       0x00000200  /* Subfile was deleted */
#define IN_DELETE_SELF      0x00000400  /* Self was deleted */
#define IN_MOVE_SELF        0x00000800  /* Self was moved */
#define IN_ISDIR            0x40000000      /* event occurred against dir */


char * event_array[] = {
        "File was accessed",
        "File was modified",
        "File attributes were changed",
        "writtable file closed",
        "Unwrittable file closed",
        "File was opened",
        "File was moved from X",
        "File was moved to Y",
        "Subfile was created",
        "Subfile was deleted",
        "Self was deleted",
        "Self was moved",
        "",
        "Backing fs was unmounted",
        "Event queued overflowed",
        "File was ignored"
};


int main(int argc,char **argv){
int fd,wd,i,len,tmp_len;
char buffer[1024],strbuf[16];
struct inotify_event * event;
char * offset = NULL;


if(argc <2){
	printf("Usage:%s /path/to/you_wang't_monitor\n",argv[0]);
	return 0;
}

//init inotify
fd = inotify_init();
if(!fd){
	printf("Fail init inotify");
}
//add watch
wd = inotify_add_watch(fd,argv[1],IN_MODIFY | IN_CREATE | IN_DELETE);
if(!wd){
	printf("Fail to add watch");
}

//progess event
while(len=read(fd,buffer,MAX_BUF_SIZE)){
	offset=buffer;
	event = (struct inotify_event *)buffer;
	if (event->mask & IN_ISDIR) {
		memcpy(strbuf, "Direcotory", 11);
	}
	else {
		memcpy(strbuf, "File", 5);
	}

	printf("Object type: %s\n",strbuf);
	printf("Object name: %s\n", argv[1]);
	printf("Event mask: %08X\n", event->mask);
	for(i=0;i<EVENT_NUM;i++){
		if (event_array[i][0] == '\0') continue;
                if (event->mask & (1<<i)) {
                	  printf("Event: %s\n\n", event_array[i]);
                }

	}	

	tmp_len = sizeof(struct inotify_event) + event->len;
        event = (struct inotify_event *)(offset + tmp_len);
        offset += tmp_len;
 }
}