eMMC 分区 读写样例

//read emmc panel partions data to buf;
//write buf data to emmc partions

static int realrwdata(rwinfo *info)
{
    int device_fd = -1;
    device_fd = open(info->path, O_RDWR | O_SYNC);
    if (device_fd < 0) {
        return -1;
    }

    lseek(device_fd, info->rw_offset, SEEK_SET);

if(info->rw_type == DATA_W)
    info->data_size = write(device_fd, (char*)info->data_buf, info->rw_size);
else if(info->rw_type == DATA_R)
   info->data_size = read(device_fd, (char*)info->data_buf, info->rw_size);

    fsync(device_fd);
    close(device_fd);
    return info->data_size;
}