#include <sys/inotify.h>
#include <stdio.h>
#include <errno.h>

/* size of the event structure, not counting name */
#define EVENT_SIZE  (sizeof (struct inotify_event))

/* reasonable guess as to size of 1024 events */
#define BUF_LEN        (1024 * (EVENT_SIZE + 16))

int fd;
int wd;
char buf[BUF_LEN];
int len, i = 0;


int main()
{

  fd = inotify_init();

  wd = inotify_add_watch(fd, "foo.txt", IN_MODIFY);

  len = read (fd, buf, BUF_LEN);

  while (i < len) {
    struct inotify_event *event;

    event = (struct inotify_event *) &buf[i];

    if (event->mask & IN_IGNORED)
      puts("IN_IGNORED");

    if (event->mask & IN_MODIFY)
      puts("IN_MODIFY");

    i += EVENT_SIZE + event->len;
  }
  return 0;
}