source: rtems-libbsd/testsuite/cdev01/test_cdev.c @ 8dacfe4

/*
 * Copyright (c) 2016 embedded brains GmbH.  All rights reserved.
 *
 *  embedded brains GmbH
 *  Dornierstr. 4
 *  82178 Puchheim
 *  Germany
 *  <rtems@embedded-brains.de>
 *
 * 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 AUTHOR 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 AUTHOR 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 <machine/rtems-bsd-kernel-space.h>
#include <sys/types.h>
#include <sys/conf.h>

#include <rtems/seterr.h>

#include <assert.h>

#include "test_cdev01.h"

static  d_open_t        testopen;
static  d_close_t       testclose;
static  d_read_t        testread;
static  d_write_t       testwrite;
static  d_ioctl_t       testioctl;
static  d_poll_t        testpoll;
static  d_kqfilter_t    testkqfilter;

static struct cdevsw test_cdevsw = {
        .d_version =    D_VERSION,
        .d_flags =      0,
/* FIXME: check for  D_PSEUDO | D_NEEDMINOR | D_NEEDGIANT | D_TRACKCLOSE */
        .d_name =       "test",
        .d_open =       testopen,
        .d_close =      testclose,
        .d_read =       testread,
        .d_write =      testwrite,
        .d_ioctl =      testioctl,
        .d_poll =       testpoll,
        .d_kqfilter =   testkqfilter,
};

static  int
testopen(struct cdev *dev, int oflags, int devtype, struct thread *td)
{
        test_state *state = dev->si_drv1;

        assert(*state == TEST_NEW);
        *state = TEST_OPEN;

        return 0;
}

static  int
testclose(struct cdev *dev, int fflag, int devtype, struct thread *td)
{
        test_state *state = dev->si_drv1;

        assert(*state == TEST_KQFILTER);
        *state = TEST_CLOSED;

        return 0;
}

static  int
testread(struct cdev *dev, struct uio *uio, int ioflag)
{
        test_state *state = dev->si_drv1;

        assert(*state == TEST_OPEN || *state == TEST_IOCTL);
        if(*state == TEST_OPEN) {
                *state = TEST_READ;
        } else {
                *state = TEST_READV;
        }

        return 0;
}

static  int
testwrite(struct cdev *dev, struct uio *uio, int ioflag)
{
        test_state *state = dev->si_drv1;

        assert(*state == TEST_READ || *state == TEST_READV);
        if(*state == TEST_READ) {
                *state = TEST_WRITE;
        } else {
                *state = TEST_WRITEV;
        }

        return 0;
}

static  int
testioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
    struct thread *td)
{
        test_state *state = dev->si_drv1;

        assert(cmd == TEST_IOCTL_CMD);
        assert(*state == TEST_WRITE);
        *state = TEST_IOCTL;

        return 0;
}

static  int
testpoll(struct cdev *dev, int events, struct thread *td)
{
        test_state *state = dev->si_drv1;

        assert(*state == TEST_WRITEV);
        *state = TEST_POLL;

        return 1;
}

static  int
testkqfilter(struct cdev *dev, struct knote *kn)
{
        test_state *state = dev->si_drv1;

        assert(*state == TEST_POLL);
        *state = TEST_KQFILTER;

        return TEST_KQ_ERRNO;
}

void
test_make_dev(test_state *state, const char *name)
{
        struct cdev *dev = NULL;

        dev = make_dev(&test_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600, name);
        assert(dev != NULL);
        dev->si_drv1 = state;
}