/*
 * Copyright (c) 2007 SWSoft.  All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * Further, this software is distributed without any warranty that it is
 * free of the rightful claim of any third person regarding infringement
 * or the like.  Any license provided herein, whether implied or
 * otherwise, applies only to this software file.  Patent licenses, if
 * any, provided herein do not apply to combinations of this program with
 * other software, or any other product whatsoever.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Started by Andrew Vagin <avagin@sw.ru>
 *
 * DESCRIPTION
 *     Check that inotify work for a file
 *
 * ALGORITHM
 *     Execute sequence file's operation and check return events
 */
#include "config.h"

#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <sys/syscall.h>
#include "test.h"
#include "lapi/syscalls.h"
#include "inotify.h"

#if defined(HAVE_SYS_INOTIFY_H)
#include <sys/inotify.h>

#define EVENT_MAX 1024
/* size of the event structure, not counting name */
#define EVENT_SIZE  (sizeof (struct inotify_event))
/* reasonable guess as to size of 1024 events */
#define EVENT_BUF_LEN        (EVENT_MAX * (EVENT_SIZE + 16))

char *TCID = "inotify01";
int TST_TOTAL = 7;

static void setup(void);
static void cleanup(void);

#define BUF_SIZE 256
static char fname[BUF_SIZE];
static char buf[BUF_SIZE];
static int fd, fd_notify;
static int wd, reap_wd;

static int event_set[EVENT_MAX];

static char event_buf[EVENT_BUF_LEN];

int main(int ac, char **av)
{
	int lc;

	tst_parse_opts(ac, av, NULL, NULL);

	setup();

	for (lc = 0; TEST_LOOPING(lc); lc++) {
		tst_count = 0;

		/*
		 * generate sequence of events
		 */
		if (chmod(fname, 0755) < 0) {
			tst_brkm(TBROK | TERRNO, cleanup,
				 "chmod(%s, 0755) failed", fname);
		}
		event_set[tst_count] = IN_ATTRIB;
		tst_count++;

		if ((fd = open(fname, O_RDONLY)) == -1) {
			tst_brkm(TBROK | TERRNO, cleanup,
				 "open(%s, O_RDWR|O_CREAT,0700) failed", fname);
		}
		event_set[tst_count] = IN_OPEN;
		tst_count++;

		if (read(fd, buf, BUF_SIZE) == -1) {
			tst_brkm(TBROK | TERRNO, cleanup,
				 "read(%d, buf, %d) failed", fd, BUF_SIZE);
		}
		event_set[tst_count] = IN_ACCESS;
		tst_count++;

		if (close(fd) == -1) {
			tst_brkm(TBROK, cleanup, "close(%s) failed", fname);
		}
		event_set[tst_count] = IN_CLOSE_NOWRITE;
		tst_count++;

		if ((fd = open(fname, O_RDWR | O_CREAT, 0700)) == -1) {
			tst_brkm(TBROK, cleanup,
				 "open(%s, O_RDWR|O_CREAT,0700) failed", fname);
		}
		event_set[tst_count] = IN_OPEN;
		tst_count++;

		if (write(fd, buf, BUF_SIZE) == -1) {
			tst_brkm(TBROK, cleanup,
				 "write(%d, %s, 1) failed", fd, fname);
		}
		event_set[tst_count] = IN_MODIFY;
		tst_count++;

		if (close(fd) == -1) {
			tst_brkm(TBROK, cleanup, "close(%s) failed", fname);
		}
		event_set[tst_count] = IN_CLOSE_WRITE;
		tst_count++;

		if (TST_TOTAL != tst_count) {
			tst_brkm(TBROK, cleanup,
				 "TST_TOTAL and tst_count are not equal");
		}
		tst_count = 0;

		/*
		 * get list on events
		 */
		int len, i = 0, test_num = 0;
		if ((len = read(fd_notify, event_buf, EVENT_BUF_LEN)) < 0) {
			tst_brkm(TBROK, cleanup,
				 "read(%d, buf, %zu) failed",
				 fd_notify, EVENT_BUF_LEN);

		}

		/*
		 * check events
		 */
		while (i < len) {
			struct inotify_event *event;
			event = (struct inotify_event *)&event_buf[i];
			if (test_num >= TST_TOTAL) {
				tst_resm(TFAIL,
					 "get unnecessary event: wd=%d mask=%x "
					 "cookie=%u len=%u",
					 event->wd, event->mask,
					 event->cookie, event->len);
			} else if (event_set[test_num] == event->mask) {
				if (event->cookie != 0) {
					tst_resm(TFAIL,
						 "get event: wd=%d mask=%x "
						 "cookie=%u (expected 0) len=%u",
						 event->wd, event->mask,
						 event->cookie, event->len);
				} else {
					tst_resm(TPASS, "get event: wd=%d "
						 "mask=%x cookie=%u len=%u",
						 event->wd, event->mask,
						 event->cookie, event->len);
				}

			} else {
				tst_resm(TFAIL, "get event: wd=%d mask=%x "
					 "(expected %x) cookie=%u len=%u",
					 event->wd, event->mask,
					 event_set[test_num],
					 event->cookie, event->len);
			}
			test_num++;
			i += EVENT_SIZE + event->len;
		}
		for (; test_num < TST_TOTAL; test_num++) {
			tst_resm(TFAIL, "didn't get event: mask=%x",
				 event_set[test_num]);

		}

	}

	cleanup();
	tst_exit();
}

static void setup(void)
{

	tst_sig(NOFORK, DEF_HANDLER, cleanup);

	TEST_PAUSE;

	tst_tmpdir();

	sprintf(fname, "tfile_%d", getpid());
	if ((fd = open(fname, O_RDWR | O_CREAT, 0700)) == -1) {
		tst_brkm(TBROK | TERRNO, cleanup,
			 "open(%s, O_RDWR|O_CREAT,0700) failed", fname);
	}
	if ((write(fd, fname, 1)) == -1) {
		tst_brkm(TBROK | TERRNO, cleanup, "write(%d, %s, 1) failed",
			 fd, fname);
	}

	/* close the file we have open */
	if (close(fd) == -1) {
		tst_brkm(TBROK, cleanup, "close(%s) failed", fname);
	}
	if ((fd_notify = myinotify_init()) < 0) {
		if (errno == ENOSYS) {
			tst_brkm(TCONF, cleanup,
				 "inotify is not configured in this kernel.");
		} else {
			tst_brkm(TBROK | TERRNO, cleanup,
				 "inotify_init failed");
		}
	}

	if ((wd = myinotify_add_watch(fd_notify, fname, IN_ALL_EVENTS)) < 0) {
		tst_brkm(TBROK | TERRNO, cleanup,
			 "inotify_add_watch (%d, %s, IN_ALL_EVENTS) failed",
			 fd_notify, fname);
		reap_wd = 1;
	};

}

static void cleanup(void)
{
	if (reap_wd && myinotify_rm_watch(fd_notify, wd) < 0) {
		tst_resm(TWARN | TERRNO, "inotify_rm_watch (%d, %d) failed",
			 fd_notify, wd);

	}

	if (fd_notify > 0 && close(fd_notify))
		tst_resm(TWARN, "close(%d) failed", fd_notify);

	tst_rmdir();
}

#else

char *TCID = "inotify01";
int TST_TOTAL = 0;

int main(void)
{
	tst_brkm(TCONF, NULL, "system doesn't have required inotify support");
}

#endif
