virtchar1.c

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/*
 * Copyright (c) 2010 Vojtech Horky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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 <inttypes.h>
#include <errno.h>
#include <str_error.h>
#include <sys/types.h>
#include <async.h>
#include <device/char_dev.h>
#include <str.h>
#include <vfs/vfs.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "../../tester.h"

#define DEVICE_PATH_NORMAL "/dev/devices/\\virt\\null\\a"
#define DEVICE_PATH_CLASSES "/dev/class/virt-null\\1"
#define BUFFER_SIZE 64

static const char *test_virtchar1_internal(const char *path)
{
        TPRINTF("Opening `%s'...\n", path);
        int fd = open(path, O_RDONLY);
        if (fd < 0) {
                TPRINTF("   ...error: %s\n", str_error(fd));
                if (fd == ENOENT) {
                        TPRINTF("   (error was ENOENT: " \
                            "have you compiled test drivers?)\n");
                }
                return "Failed opening devman driver device for reading";
        }
        
        TPRINTF("   ...file handle %d\n", fd);

        TPRINTF(" Asking for phone...\n");
        int phone = fd_phone(fd);
        if (phone < 0) {
                close(fd);
                TPRINTF("   ...error: %s\n", str_error(phone));
                return "Failed to get phone to device";
        }
        TPRINTF("   ...phone is %d\n", phone);
        
        TPRINTF(" Will try to read...\n");
        size_t i;
        char buffer[BUFFER_SIZE];
        char_dev_read(phone, buffer, BUFFER_SIZE);
        TPRINTF(" ...verifying that we read zeroes only...\n");
        for (i = 0; i < BUFFER_SIZE; i++) {
                if (buffer[i] != 0) {
                        return "Not all bytes are zeroes";
                }
        }
        TPRINTF("   ...data read okay\n");
        
        /* Clean-up. */
        TPRINTF(" Closing phones and file descriptors\n");
        async_hangup(phone);
        close(fd);
        
        return NULL;
}

const char *test_virtchar1(void)
{;
        const char *res;

        res = test_virtchar1_internal(DEVICE_PATH_NORMAL);
        if (res != NULL) {
                return res;
        }

        res = test_virtchar1_internal(DEVICE_PATH_CLASSES);
        if (res != NULL) {
                return res;
        }

        return NULL;
}

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