C++ (Cpp) VDev::read示例

示例#1

文件： vdev_posix.cpp 项目： FireRick/Firmware

ssize_t px4_read(int fd, void *buffer, size_t buflen)
{
	int ret;
	if (valid_fd(fd)) {
		VDev *dev = (VDev *)(filemap[fd]->vdev);
		PX4_DEBUG("px4_read fd = %d", fd);
		ret = dev->read(filemap[fd], (char *)buffer, buflen);
	}
	else { 
                ret = -EINVAL;
        }
	if (ret < 0) {
		px4_errno = -ret;
		ret = PX4_ERROR;
	}
	return ret;
}

示例#2

文件： vdev_posix.cpp 项目： ruslanmustafin/Firmware

	ssize_t px4_read(int fd, void *buffer, size_t buflen)
	{
		int ret;

		VDev *dev = get_vdev(fd);

		if (dev) {
			PX4_DEBUG("px4_read fd = %d", fd);
			ret = dev->read(filemap[fd], (char *)buffer, buflen);

		} else {
			ret = -EINVAL;
		}

		if (ret < 0) {
			px4_errno = -ret;
			ret = PX4_ERROR;
		}

		return ret;
	}