C++ dev_open函数代码示例

void start(void)
{	
	uint16_t count;
	uint8_t index;

	buffer = (char *)mos_mem_alloc((uint16_t)BUFFER_SIZE);
	memset(buffer, 'X', BUFFER_SIZE);

	/* For safety, erase entire FLASH */
	dev_ioctl(DEV_TELOS_FLASH, TELOS_FLASH_BULK_ERASE);

	/* Turn on the FLASH */
	dev_mode(DEV_TELOS_FLASH, DEV_MODE_ON);
	
	/* Acquire lock on FLASH and preliminarly 
	 * write 64 bits of data */
	dev_open(DEV_TELOS_FLASH);
	count = dev_write(DEV_TELOS_FLASH, "abcdefgh", 8);
	printf("%d bytes of data have been written to FLASH memory\n", count);
	dev_close(DEV_TELOS_FLASH);

			/* Perform experiments over R/W pointer to FLASH */	

	/* Experiment#1 - flash is on, lock is free; aquire lock and read 
	 *                without using any SEEK function */
	dev_open(DEV_TELOS_FLASH);
	count = dev_read(DEV_TELOS_FLASH, buffer, 1);
	printf("#1 : %c has been read from FLASH memory\n", buffer[0]);	
	dev_close(DEV_TELOS_FLASH);

	/* Move pointer */
	dev_open(DEV_TELOS_FLASH);
	dev_ioctl(DEV_TELOS_FLASH, DEV_SEEK, 3);
	dev_close(DEV_TELOS_FLASH);	

	/* Experiment#2 - flash is on, lock is free; aquire lock, read single data, 
	 * write single data and read multiple data from it */
	dev_open(DEV_TELOS_FLASH);
	dev_read(DEV_TELOS_FLASH, buffer, 1);
	printf("#2 : %c has been read\n"
		   "   : FLASH memory written\n", buffer[0]);
	dev_write(DEV_TELOS_FLASH, "l", 1);	
	count =	dev_read(DEV_TELOS_FLASH, buffer, 1);
	printf("   : %d bytes have been read from FLASH memory: ", count);
	for(index = 0; index < count; index++)
	{
		printf("%c ", buffer[index]);
	}
	printf("\n");
	dev_close(DEV_TELOS_FLASH);

	/* Release lock and free resources */
	dev_close(DEV_TELOS_FLASH);
	dev_mode(DEV_TELOS_FLASH, DEV_MODE_OFF);
	mos_mem_free(buffer);

	return;
}

/** Add the interface (net device) for a vnet.
 * Sets the dev field of the vnet on success.
 * Does nothing if the vnet already has an interface.
 *
 * @param vnet vnet
 * @return 0 on success, error code otherwise
 */
int vnet_dev_add(Vnet *vnet){
    int err = 0;
    struct net_device *dev = NULL;

    if(vnet->dev) goto exit;
    vnet->header_n = ETH_HLEN + sizeof(struct iphdr) + sizeof(struct etheriphdr);
    if(etherip_in_udp){
        vnet->header_n += sizeof(struct VnetMsgHdr);
        vnet->header_n += sizeof(struct udphdr);
    }
    vnet->header_n = roundupto(vnet->header_n, 4);
    dev = alloc_netdev(0, vnet->device, vnet_dev_init);
    if(!dev){
        err = -ENOMEM;
        goto exit;
    }
    err = vnet_dev_setup(vnet, dev);
    if(err) goto exit;
    rtnl_lock();
    dev_open(dev);
    rtnl_unlock();

  exit:
    return err;
}

BOOL ota_check(void)
{
  ota_bl_info_t bl_info = {0};
  charsto_cfg_t charsto_cfg = {0};
  void  *p_dev = NULL;
  RET_CODE ret = ERR_FAILURE;

  /******char storage init******/
  ret = ATTACH_DRIVER(CHARSTO, warriors, default, default);
  MT_ASSERT(ret == SUCCESS);

  p_dev = dev_find_identifier(NULL, DEV_IDT_TYPE, SYS_DEV_TYPE_CHARSTO);
  MT_ASSERT(NULL != p_dev);

  charsto_cfg.size = CHARSTO_SIZE; //4
  charsto_cfg.spi_clk = FLASH_C_CLK_P6;
  charsto_cfg.rd_mode = SPI_FR_MODE;
  //charsto_cfg.multi_io_rd = 1;
  //charsto_cfg.multi_io_wd = 1;
  ret = dev_open(p_dev, &charsto_cfg);
  MT_ASSERT(ret == SUCCESS);

  /* open uio */
  uio_init();

  mtos_task_delay_ms(M_TASK_DELAY_TIME);

  if(mul_ota_dm_api_check_intact_picec(OTA_DM_BLOCK_PIECE_OTA_BLINFO_ID) == FALSE)
  {
      ui_ota_api_bootload_info_init();
  }

  mul_ota_dm_api_read_bootload_info(&bl_info);
  OS_PRINTF("\r\n[OTA]%s:ota_tri[%d] ",__FUNCTION__, bl_info.ota_status);



  /* flash burning is not finished, force ota*/
  if( bl_info.destroy_flag == TRUE) 
  {
      bl_info.ota_status = OTA_TRI_MODE_FORC;
      mul_ota_dm_api_save_bootload_info(&bl_info);
      return TRUE;
  }

  if(is_force_key_press())
  {
    bl_info.ota_status = OTA_TRI_MODE_AUTO;
    mul_ota_dm_api_save_bootload_info(&bl_info);
    return TRUE;
  }

  if((bl_info.ota_status == OTA_TRI_MODE_AUTO)
  ||(bl_info.ota_status == OTA_TRI_MODE_FORC))
  {
      return TRUE;
  }

  return FALSE;
}

static struct net_device *ipmr_reg_vif(void)
{
    struct net_device *dev;
    struct in_device *in_dev;

    dev = alloc_netdev(sizeof(struct net_device_stats), "pimreg",
                       reg_vif_setup);

    if (dev == NULL)
        return NULL;

    if (register_netdevice(dev)) {
        free_netdev(dev);
        return NULL;
    }
    dev->iflink = 0;

    if ((in_dev = inetdev_init(dev)) == NULL)
        goto failure;

    in_dev->cnf.rp_filter = 0;

    if (dev_open(dev))
        goto failure;

    return dev;

failure:
    unregister_netdevice(dev);
    return NULL;
}

/*****************************************************************************
 * Open the "real" network devices. Return the number of opened interfaces.
 *****************************************************************************/
int open_network_devices(int promisc)
{
	struct net_device *dev;
	struct net *net;
	int err = 0, cnt = 0;

	DEBUG(ANKH_DEBUG_INIT, "%s() \n", __func__);

	for_each_net(net) {
		for_each_netdev(net, dev)
		{
			DEBUG(ANKH_DEBUG_INIT, "opening %s\n", dev->name);

			// beam us to promiscuous mode, so that we can receive packets that
			// are not meant for the NIC's MAC address --> we need that, because
			// ORe clients have different MAC addresses
			if (promisc && netdev_set_promisc(dev) == 0)
					DEBUG(ANKH_DEBUG_INIT, "set interface to promiscuous mode.\n");

			err = dev_open(dev);
			if (err)
			{
				DEBUG(ANKH_DEBUG_INIT, "error opening %s : %d\n", dev->name, err);
				return err;
			}
			else // success
				netdev_add(dev);

		cnt++;
		//xmit_lock_add(dev->name);
		}
	}

static struct net_device *ip6mr_reg_vif(struct net *net)
{
	struct net_device *dev;

	dev = alloc_netdev(0, "pim6reg", reg_vif_setup);
	if (dev == NULL)
		return NULL;

	dev_net_set(dev, net);

	if (register_netdevice(dev)) {
		free_netdev(dev);
		return NULL;
	}
	dev->iflink = 0;

	if (dev_open(dev))
		goto failure;

	dev_hold(dev);
	return dev;

failure:
	/* allow the register to be completed before unregistering. */
	rtnl_unlock();
	rtnl_lock();

	unregister_netdevice(dev);
	return NULL;
}

/* Unused */
int label_verify(struct device *dev)
{
#pragma pack(8)
        char buf[LABEL_SIZE];
#pragma pack()
        struct labeller *l;
        //char buf[LABEL_SIZE] __attribute((aligned(8)));
        uint64_t sector;
        struct lvmcache_info *info;
        int r = 0;

        if (!dev_open(dev)) {
                if ((info = info_from_pvid(dev->pvid)))
                        lvmcache_update_vgname_and_id(info, ORPHAN, ORPHAN,
                                                      0, NULL);

                return_0;
        }

        if (!(l = _find_labeller(dev, buf, &sector, UINT64_C(0))))
                goto_out;

        r = l->ops->verify ? l->ops->verify(l, buf, sector) : 1;

      out:
        if (!dev_close(dev))
                stack;

        return r;
}

static struct net_device *ipmr_reg_vif(void)
{
	struct net_device *dev;
	struct in_device *in_dev;

	dev = alloc_netdev(sizeof(struct net_device_stats), "pimreg",
			   reg_vif_setup);

	if (dev == NULL)
		return NULL;

	if (register_netdevice(dev)) {
		free_netdev(dev);
		return NULL;
	}
	dev->iflink = 0;

	if ((in_dev = inetdev_init(dev)) == NULL)
		goto failure;

	in_dev->cnf.rp_filter = 0;

	if (dev_open(dev))
		goto failure;

	return dev;

failure:
	/* allow the register to be completed before unregistering. */
	rtnl_unlock();
	rtnl_lock();

	unregister_netdevice(dev);
	return NULL;
}

void rds(char *arg)
{
	int c;
	char *val, err[0xff];
	struct pcimaxfm_rds_set rds_set;

	while (*arg != '\0') {
		if ((c = (getsubopt(&arg, rds_params_name, &val))) == -1)
			ERROR_MSG("Invalid RDS parameter \"%s\".", val);

		if (validate_rds(c, val, sizeof(err), err)) {
			ERROR_MSG("%s", err);
		}

		dev_open();

		rds_set.param = c;
		rds_set.value = val;

		if(ioctl(fd, PCIMAXFM_RDS_SET, &rds_set) == -1) {
			ERROR_MSG("Writing RDS parameter %s = \"%s\" failed.",
					rds_params_name[rds_set.param],
					rds_set.value);
		}

		NOTICE_MSG("RDS: %-4s = \"%s\"",
				rds_params_name[rds_set.param], rds_set.value);
	}
}

void power(const char *arg)
{
	int power;

	dev_open();
	if (arg) {
		if (sscanf(arg, "%u", &power) < 1) {
			ERROR_MSG("Invalid power level. Got \"%s\", expected integer in the range of %d-%d.", arg, PCIMAXFM_POWER_MIN, PCIMAXFM_POWER_MAX);
		}

		if (power < PCIMAXFM_POWER_MIN || power > PCIMAXFM_POWER_MAX) {
			ERROR_MSG("Power level out of range. Got %d, expected %d-%d.", power, PCIMAXFM_POWER_MIN, PCIMAXFM_POWER_MAX);
		}

		if (ioctl(fd, PCIMAXFM_POWER_SET, &power) == -1) {
			ERROR_MSG("Setting power level failed.");
		}
	} else {
		if (ioctl(fd, PCIMAXFM_POWER_GET, &power) == -1) {
			ERROR_MSG("Reading power level failed.");
		}

		if (power == PCIMAXFM_POWER_NA) {
			NOTICE_MSG("Power level not set yet.");
			return;
		}
	}

	NOTICE_MSG("Power level: %d/%d", power, PCIMAXFM_POWER_MAX);
}

int main (void)
{
	unsigned int mainkey;

	char buf[128] = {0,};

	printf("Program Start...\n");
	

	dev_fd = dev_open("/dev/webconn", WEBCONN_MAJOR, 0);

	write(dev_fd, "khkrai", 128);

	read(dev_fd, &buf, 128);

	printf("\n\nbuf=%s\n", buf);

	printf("%x\n", IOCTL_WRITE);
	printf("%x\n", IOCTL_READ);
	ioctl(dev_fd, IOCTL_WRITE, 1);
	ioctl(dev_fd, IOCTL_READ, 0);


	close(dev_fd);
		return 0;
}

/* Called whenever someone tries to open our node (even for a stat).  We
   delay opening the kernel device until this point, as we can usefully
   return errors from here.  */
static error_t
check_open_hook (struct trivfs_control *trivfs_control,
		 struct iouser *user,
		 int flags)
{
  struct dev *const dev = trivfs_control->hook;
  error_t err = 0;

  if (!err && dev_is_readonly (dev) && (flags & O_WRITE))
    return EROFS;

  mutex_lock (&dev->lock);
  if (dev->store == NULL)
    {
      /* Try and open the store.  */
      err = dev_open (dev);
      if (err && (flags & (O_READ|O_WRITE)) == 0)
	/* If we're not opening for read or write, then just ignore the
	   error, as this allows stat to work correctly.  XXX  */
	err = 0;
    }
  mutex_unlock (&dev->lock);

  return err;
}

static
struct net_device *ipmr_new_tunnel(struct net *net, struct vifctl *v)
{
	struct net_device  *dev;

	dev = __dev_get_by_name(net, "tunl0");

	if (dev) {
		const struct net_device_ops *ops = dev->netdev_ops;
		int err;
		struct ifreq ifr;
		struct ip_tunnel_parm p;
		struct in_device  *in_dev;

		memset(&p, 0, sizeof(p));
		p.iph.daddr = v->vifc_rmt_addr.s_addr;
		p.iph.saddr = v->vifc_lcl_addr.s_addr;
		p.iph.version = 4;
		p.iph.ihl = 5;
		p.iph.protocol = IPPROTO_IPIP;
		sprintf(p.name, "dvmrp%d", v->vifc_vifi);
		ifr.ifr_ifru.ifru_data = (__force void __user *)&p;

		if (ops->ndo_do_ioctl) {
			mm_segment_t oldfs = get_fs();

			set_fs(KERNEL_DS);
			err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
			set_fs(oldfs);
		} else
			err = -EOPNOTSUPP;

		dev = NULL;

		if (err == 0 &&
		    (dev = __dev_get_by_name(net, p.name)) != NULL) {
			dev->flags |= IFF_MULTICAST;

			in_dev = __in_dev_get_rtnl(dev);
			if (in_dev == NULL)
				goto failure;

			ipv4_devconf_setall(in_dev);
			IPV4_DEVCONF(in_dev->cnf, RP_FILTER) = 0;

			if (dev_open(dev))
				goto failure;
			dev_hold(dev);
		}
	}
	return dev;

failure:
	/* allow the register to be completed before unregistering. */
	rtnl_unlock();
	rtnl_lock();

	unregister_netdevice(dev);
	return NULL;
}

void install_drivers() {
  dev_t console;

  // Register /proc/units
  register_proc_inode("units", units_proc, NULL);
  register_proc_inode("devices", devices_proc, NULL);
  register_proc_inode("devstat", devstat_proc, NULL);

  // Parse driver binding database
  parse_bindings();

  // Match bindings to units
  bind_units();

  // Install legacy drivers
  install_legacy_drivers();

  // Make sure we have a console device
  console = dev_open("console");
  if (console == NODEV) {
    initialize_driver(NULL, "krnl.dll!console");
  } else {
    dev_close(console);
  }
}

/* FIXME Avoid repeated re-reading if cache lock held */
int label_read(struct device *dev, struct label **result,
                uint64_t scan_sector)
{
#pragma pack(8)
        char buf[LABEL_SIZE]; //__attribute((aligned(8)));
#pragma pack()
        struct labeller *l;
        uint64_t sector;
        struct lvmcache_info *info;
        int r = 0;

        if (!dev_open(dev)) {
                stack;

                if ((info = info_from_pvid(dev->pvid)))
                        lvmcache_update_vgname_and_id(info, ORPHAN, ORPHAN,
                                                      0, NULL);

                return r;
        }

        if (!(l = _find_labeller(dev, buf, &sector, scan_sector)))
                goto_out;

        if ((r = (l->ops->read)(l, dev, buf, result)) && result && *result)
                (*result)->sector = sector;

      out:
        if (!dev_close(dev))
                stack;

        return r;
}