/*This is the sample program to notify us for the file creation and file deletion takes place in “/tmp” directory*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <linux/inotify.h>

#define EVENT_SIZE  ( sizeof (struct inotify_event) )
#define EVENT_BUF_LEN     ( 1024 * ( EVENT_SIZE + 16 ) )

int main( )
{
    int length, i = 0;
    int fd;
    int wd;
    char buffer[EVENT_BUF_LEN];

    /*creating the INOTIFY instance*/
    fd = inotify_init();

    /*checking for error*/
    if ( fd < 0 ) {
        perror( "inotify_init" );
    }

    /*adding the “/tmp” directory into watch list. Here, the suggestion is to validate the existence of the directory before adding into monitoring list.*/
    wd = inotify_add_watch( fd, "/tmp", IN_CREATE | IN_DELETE );

    /*read to determine the event change happens on “/tmp” directory. Actually this read blocks until the change event occurs*/

    length = read( fd, buffer, EVENT_BUF_LEN );

    /*checking for error*/
    if ( length < 0 ) {
        perror( "read" );
    }

    /*actually read return the list of change events happens. Here, read the change event one by one and process it accordingly.*/
    while ( i < length ) {     struct inotify_event *event = ( struct inotify_event * ) &buffer[ i ];     if ( event->len ) {
        if ( event->mask & IN_MODIFY ) {

               printf( "New directory %s MODIFY.\n", event->name );

            else {
                printf( "N222\n", event->name );
            }
        }
        else if ( event->mask & IN_DELETE ) {
            if ( event->mask & IN_ISDIR ) {
                printf( "Directory %s deleted.\n", event->name );
            }
            else {
                printf( "File %s deleted.\n", event->name );
            }
        }
    }
        i += EVENT_SIZE + event->len;
    }
    /*removing the “/tmp” directory from the watch list.*/
    inotify_rm_watch( fd, wd );

    /*closing the INOTIFY instance*/
    close( fd );

}