#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/inotify.h>
#include <limits.h>

#define log(...) fprintf(stderr, __VA_ARGS__)

static void
put(int c)
{
	putchar(c);
	fflush(stdout);
}

int
main(int argc, char *argv[])
{
	int ifd = -1;
	int wd;
	char buf[sizeof(struct inotify_event) + NAME_MAX + 1];

	if (argc != 2) {
		log("I need a file..\n");
		goto error;
	}

	ifd = inotify_init();
	if (ifd < 0) {
		if (errno == EMFILE)
			put('!');
		else
			log("Error initializing inotify: %s\n",
				strerror(errno));
		goto error;
	}

	wd = inotify_add_watch(ifd, argv[1], IN_CLOSE_WRITE | IN_DELETE);
	if (wd < 0) {
		log("Error adding watch on '%s': %s\n",
				argv[1], strerror(errno));
		goto error;
	}

	put('z');
	if (read(ifd, buf, sizeof(buf)) < 0) {
		log("Error reading inotify event: %s\n",
				strerror(errno));
		goto error;
	}

	put('x');
	if (close(ifd)) {
		log("Error closing inotify: %s\n",
				strerror(errno));
		ifd = -1;
		goto error;
	}
	put('.');
	return EXIT_SUCCESS;

error:
	if (ifd > 0)
		close(ifd);
	return EXIT_FAILURE;
}