C++ (Cpp) _find_unused_sessionの例

コード例 #1

ファイル: mavlink_ftp.cpp プロジェクト: 0919061/PX4Firmware

/// @brief Responds to an Open command
MavlinkFTP::ErrorCode
MavlinkFTP::_workOpen(PayloadHeader* payload, int oflag)
{
	int session_index = _find_unused_session();
	if (session_index < 0) {
		warnx("FTP: Open failed - out of sessions\n");
		return kErrNoSessionsAvailable;
	}

	char *filename = _data_as_cstring(payload);

	uint32_t fileSize = 0;
	struct stat st;
	if (stat(filename, &st) != 0) {
		// fail only if requested open for read
		if (oflag & O_RDONLY)
			return kErrFailErrno;
		else
			st.st_size = 0;
	}
	fileSize = st.st_size;

	int fd = ::open(filename, oflag);
	if (fd < 0) {
		return kErrFailErrno;
	}
	_session_fds[session_index] = fd;

	payload->session = session_index;
	payload->size = sizeof(uint32_t);
	*((uint32_t*)payload->data) = fileSize;

	return kErrNone;
}

コード例 #2

ファイル: mavlink_ftp.cpp プロジェクト: dyeldandi/px4

/// @brief Responds to an Open command
MavlinkFTP::ErrorCode
MavlinkFTP::_workOpen(PayloadHeader* payload, bool create)
{
	int session_index = _find_unused_session();
	if (session_index < 0) {
		warnx("FTP: Open failed - out of sessions\n");
		return kErrNoSessionsAvailable;
	}
	
	char *filename = _data_as_cstring(payload);
	
	uint32_t fileSize = 0;
	if (!create) {
		struct stat st;
		if (stat(filename, &st) != 0) {
			return kErrFailErrno;
		}
		fileSize = st.st_size;
	}

	int oflag = create ? (O_CREAT | O_EXCL | O_APPEND) : O_RDONLY;
    
	int fd = ::open(filename, oflag);
	if (fd < 0) {
		return kErrFailErrno;
	}
	_session_fds[session_index] = fd;

	payload->session = session_index;
	if (create) {
		payload->size = 0;
	} else {
		payload->size = sizeof(uint32_t);
		*((uint32_t*)payload->data) = fileSize;
	}

	return kErrNone;
}