/*      $NetBSD: t_filedesc.c,v 1.6 2017/01/13 21:30:41 christos Exp $  */

/*-
* Copyright (c) 2010 The NetBSD Foundation, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

#include <sys/cdefs.h>
__RCSID("$NetBSD: t_filedesc.c,v 1.6 2017/01/13 21:30:41 christos Exp $");

#include <sys/types.h>

#include <assert.h>
#include <atf-c.h>
#include <fcntl.h>
#include <stdlib.h>
#include <pthread.h>

#include <rump/rump.h>
#include <rump/rump_syscalls.h>

#include "h_macros.h"

ATF_TC(getfilerace);
ATF_TC_HEAD(getfilerace, tc)
{

       atf_tc_set_md_var(tc, "descr", "race between multithreaded proc. "
           "fd_getfile() and fd_close() (PR kern/43694)");
}

static int fd;
static volatile bool quit;

static void *
wrkwrk(void *arg)
{

       /* just something to cause fd_getfile() to be called */
       while (!quit)
               rump_sys_write(fd, &fd, sizeof(fd));

       return NULL;
}

/* for me, 1000 triggers extremely seldom, 10k sometimes, 100k almost always */
#define DEFAULT_ITERATIONS 10000

ATF_TC_BODY(getfilerace, tc)
{
       pthread_t pt;
       int fd_wrk;
       int i, iters;

       /*
        * Want a multiprocessor virtual kernel.  A multiprocessor host
        * probably helps too, but that's harder to do in software...
        */
       setenv("RUMP_NCPU", "2", 1);
       rump_init();

       fd = fd_wrk = rump_sys_open("/dev/null", O_RDWR, 0);
       if (fd == -1)
               atf_tc_fail_errno("cannot open /dev/null");

       if (atf_tc_has_config_var(tc, "iters"))
               iters = atoi(atf_tc_get_config_var(tc, "iters"));
       else
               iters = DEFAULT_ITERATIONS;

       pthread_create(&pt, NULL, wrkwrk, NULL);
       for (i = 0; i < iters; i++) {
               rump_sys_close(fd_wrk);
               fd_wrk = rump_sys_open("/dev/null", O_RDWR, 0);
               assert(fd == fd_wrk);
       }

       quit = true;
       pthread_join(pt, NULL);
}

ATF_TP_ADD_TCS(tp)
{
       ATF_TP_ADD_TC(tp, getfilerace);

       return atf_no_error();
}