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LIBSERIAL_SERIALSTREAMBUF(3) - man page online | library functions

This is the streambuf subclass used by SerialStream.

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Sat Oct 24 2015
LibSerial::SerialStreamBuf(3)               libserial               LibSerial::SerialStreamBuf(3)

NAME LibSerial::SerialStreamBuf - This is the streambuf subclass used by SerialStream.
SYNOPSIS #include <SerialStreamBuf.h> Inherits streambuf. Public Types enum BaudRateEnum { BAUD_50 = SerialPort::BAUD_50, BAUD_75 = SerialPort::BAUD_75, BAUD_110 = SerialPort::BAUD_110, BAUD_134 = SerialPort::BAUD_134, BAUD_150 = SerialPort::BAUD_150, BAUD_200 = SerialPort::BAUD_200, BAUD_300 = SerialPort::BAUD_300, BAUD_600 = SerialPort::BAUD_600, BAUD_1200 = SerialPort::BAUD_1200, BAUD_1800 = SerialPort::BAUD_1800, BAUD_2400 = SerialPort::BAUD_2400, BAUD_4800 = SerialPort::BAUD_4800, BAUD_9600 = SerialPort::BAUD_9600, BAUD_19200 = SerialPort::BAUD_19200, BAUD_38400 = SerialPort::BAUD_38400, BAUD_57600 = SerialPort::BAUD_57600, BAUD_115200 = SerialPort::BAUD_115200, BAUD_230400 = SerialPort::BAUD_230400, BAUD_DEFAULT = SerialPort::BAUD_DEFAULT, BAUD_INVALID = -1 } The baud rates currently supported by the SUS-2 general terminal interface specification. enum CharSizeEnum { CHAR_SIZE_5 = SerialPort::CHAR_SIZE_5, CHAR_SIZE_6 = SerialPort::CHAR_SIZE_6, CHAR_SIZE_7 = SerialPort::CHAR_SIZE_7, CHAR_SIZE_8 = SerialPort::CHAR_SIZE_8, CHAR_SIZE_DEFAULT = SerialPort::CHAR_SIZE_DEFAULT, CHAR_SIZE_INVALID } The allowed values of character sizes that can be used during the serial communication. enum ParityEnum { PARITY_EVEN = SerialPort::PARITY_EVEN, PARITY_ODD = SerialPort::PARITY_ODD, PARITY_NONE = SerialPort::PARITY_NONE, PARITY_DEFAULT = SerialPort::PARITY_DEFAULT, PARITY_INVALID } The allowed values of the parity associated with the serial port communications. enum FlowControlEnum { FLOW_CONTROL_HARD = SerialPort::FLOW_CONTROL_HARD, FLOW_CONTROL_SOFT = SerialPort::FLOW_CONTROL_SOFT, FLOW_CONTROL_NONE = SerialPort::FLOW_CONTROL_NONE, FLOW_CONTROL_DEFAULT = SerialPort::FLOW_CONTROL_DEFAULT, FLOW_CONTROL_INVALID } The values of the flow control settings for a serial port. Public Member Functions SerialStreamBuf () The default constructor. ~SerialStreamBuf () The destructor. bool is_open () const Returns true if a previous call to open() succeeded (returned a non-null value) and there has been no intervening call to close. SerialStreamBuf * open (const std::string filename, std::ios_base::openmode mode=std::ios_base::in|std::ios_base::out) If is_open() != false, returns a null pointer. SerialStreamBuf * close () If is_open() == false, returns a null pointer. int SetParametersToDefault () Initialize the serial communication parameters to their default values. const BaudRateEnum SetBaudRate (const BaudRateEnum baudRate) If is_open() != true, return -1. const BaudRateEnum BaudRate () const Return the current baud rate of the serial port. const CharSizeEnum SetCharSize (const CharSizeEnum charSize) Set the character size to be used during serial communication. const CharSizeEnum CharSize () const Return the character size currently being used for serial communication. short SetNumOfStopBits (short numOfStopBits) Set the number of stop bits used during serial communication. short NumOfStopBits () const Get the number of stop bits being used during serial communication. const ParityEnum SetParity (const ParityEnum parityType) Set the parity for serial communication. const ParityEnum Parity () const Get the current parity setting for the serial port. const FlowControlEnum SetFlowControl (const FlowControlEnum flowControlType) Use the specified flow control. const FlowControlEnum FlowControl () const Return the current flow control setting. const short SetVMin (short vtime) Set the minimum number of characters for non-canonical reads. const short VMin () const Get the VMIN value for the device. const short SetVTime (short vtime) Set character buffer timeout in 10ths of a second. const short VTime () const Get the current timeout value for non-canonical reads in deciseconds. Static Public Attributes static const BaudRateEnum DEFAULT_BAUD The default value of the baud rate of the serial port. static const CharSizeEnum DEFAULT_CHAR_SIZE The default value of the character size used during the serial communication. static const short DEFAULT_NO_OF_STOP_BITS The default number of stop bits used. static const ParityEnum DEFAULT_PARITY The default parity setting. static const FlowControlEnum DEFAULT_FLOW_CONTROL The default flow control setting. static const short DEFAULT_VMIN The default character buffer size. static const short DEFAULT_VTIME The default character buffer timing. Protected Member Functions virtual std::streambuf * setbuf (char_type *, std::streamsize) Performs an operation that is defined separately for each class derived from streambuf. virtual std::streamsize xsgetn (char_type *s, std::streamsize n) Reads upto n characters from the serial port and returns them through the character array located at s. virtual std::streamsize showmanyc () Check, wether input is available on the port. virtual int_type underflow () Reads and returns the next character from the associated serial port if one otherwise returns traits::eof(). virtual int_type uflow () Reads and returns the next character from the associated serial port if one otherwise returns traits::eof(). virtual int_type pbackfail (int_type c=traits_type::eof()) This function is called when a putback of a character fails. virtual std::streamsize xsputn (const char_type *s, std::streamsize n) Writes upto n characters from the character sequence at s to the serial port associated with the buffer. virtual int_type overflow (int_type c) Writes the specified character to the associated serial port. Static Protected Attributes static const char CTRL_Q = 0x11 Character used to signal that I/O can start while using software flow control with the serial port. static const char CTRL_S = 0x13 Character used to signal that I/O should stop while using software flow control with the serial port. Private Member Functions SerialStreamBuf (const SerialStreamBuf &) SerialStreamBuf & operator= (const SerialStreamBuf &) Private Attributes boost::scoped_ptr< Implementation > mImpl
Detailed Description This is the streambuf subclass used by SerialStream. This subclass takes care of opening the serial port file in the required modes and providing the corresponding file descriptor to SerialStream so that various parameters associated with the serial port can be set. Several features of this streambuf class resemble those of std::filebuf, however this class it not made a subclass of filebuf because we need access to the file descriptor associated with the serial port and the standard filebuf does not provide access to it. At present, this class uses unbuffered I/O and all calls to setbuf() will be ignored. Author: Author crayzeewulf Manish P. Pagey Version: Id SerialStreamBuf.h,v 1.9 2005-10-17 00:19:12 crayzeewulf Exp Definition at line 38 of file SerialStreamBuf.h.
Member Enumeration Documentation enum LibSerial::SerialStreamBuf::BaudRateEnum The baud rates currently supported by the SUS-2 general terminal interface specification. Note that B0 is not supported because it is not really a baud rate (it causes the modem to hang up i.e. drop DTR). Use the close() method instead. Deprecated This enumeration will be removed in revision 0.7.x of libserial. It is here for backward compatibility with 0.5.x releases. Please use the corresponding enumeration from SerialPort class instead. Enumerator BAUD_50 BAUD_75 BAUD_110 BAUD_134 BAUD_150 BAUD_200 BAUD_300 BAUD_600 BAUD_1200 BAUD_1800 BAUD_2400 BAUD_4800 BAUD_9600 BAUD_19200 BAUD_38400 BAUD_57600 BAUD_115200 BAUD_230400 BAUD_DEFAULT BAUD_INVALID Definition at line 59 of file SerialStreamBuf.h. enum LibSerial::SerialStreamBuf::CharSizeEnum The allowed values of character sizes that can be used during the serial communication. Deprecated This enumeration is deprecated. It will be removed in version 0.7.0. It is here for backward compatibility with version 0.5.x. Please use SerialPort::CharacterSize instead. Enumerator CHAR_SIZE_5 CHAR_SIZE_6 CHAR_SIZE_7 CHAR_SIZE_8 CHAR_SIZE_DEFAULT CHAR_SIZE_INVALID Definition at line 106 of file SerialStreamBuf.h. enum LibSerial::SerialStreamBuf::FlowControlEnum The values of the flow control settings for a serial port. Deprecated This enumeration has been deprecated and will be removed in version 0.7.0. Please use SerialPort::FlowControl instead. Enumerator FLOW_CONTROL_HARD FLOW_CONTROL_SOFT FLOW_CONTROL_NONE FLOW_CONTROL_DEFAULT FLOW_CONTROL_INVALID Invalid flow control setting. Definition at line 141 of file SerialStreamBuf.h. enum LibSerial::SerialStreamBuf::ParityEnum The allowed values of the parity associated with the serial port communications. Deprecated This enumeration is deprecated and will be removed in version 0.7.0. Please use SerialPort::Parity instead. Enumerator PARITY_EVEN PARITY_ODD PARITY_NONE PARITY_DEFAULT PARITY_INVALID Invalid parity value. Definition at line 124 of file SerialStreamBuf.h. Constructor & Destructor Documentation LibSerial::SerialStreamBuf::SerialStreamBuf () The default constructor. LibSerial::SerialStreamBuf::~SerialStreamBuf () The destructor. LibSerial::SerialStreamBuf::SerialStreamBuf (const SerialStreamBuf &) [private]
Member Function Documentation const BaudRateEnum LibSerial::SerialStreamBuf::BaudRate () const Return the current baud rate of the serial port. If the baud rate is not set to a valid value then it returns BAUD_INVALID. const CharSizeEnum LibSerial::SerialStreamBuf::CharSize () const Return the character size currently being used for serial communication. SerialStreamBuf* LibSerial::SerialStreamBuf::close () If is_open() == false, returns a null pointer. If a put area exists, calls overflow(EOF) to flush characters. Finally it closes the file by calling std::close(mFileDescriptor) where mFileDescriptor is the value returned by the last call to open(). For the implementation of the corresponding function in class filebuf, if the last virtual member function called on *this (between underflow, overflow, seekoff, and seekpos) was overflow then it calls a_codecvt.unshift (possible several times) to determine a termination sequence, inserts those characters and calls overflow(EOF) again. However, this is not implemented here yet. Postcondition: is_open() == false Returns: this on success, a null pointer otherwise. const FlowControlEnum LibSerial::SerialStreamBuf::FlowControl () const Return the current flow control setting. bool LibSerial::SerialStreamBuf::is_open () const Returns true if a previous call to open() succeeded (returned a non-null value) and there has been no intervening call to close. short LibSerial::SerialStreamBuf::NumOfStopBits () const Get the number of stop bits being used during serial communication. Returns: The number of stop bits. SerialStreamBuf* LibSerial::SerialStreamBuf::open (const std::string filename, std::ios_base::openmode mode = std::ios_base::in|std::ios_base::out) If is_open() != false, returns a null pointer. Otherwise, initializes the streambuf as required. It then opens a file, if possible, whose name is given as the string filename using the system call std::open(filename.c_str(), flags). The value of parameter flags is obtained from the value of the parameter mode. At present, only ios_base::in, ios_base::out, and (ios_base::in|ios_base::out) make sense for a serial port and hence all other settings result in the call to fail. The value of flags is obtained as: flags = u_flags | O_NOCTTY where u_flags is obtained from the following table depending on the value of the parameter mode: in out u_flags + O_RDONLY + O_WRONLY + + O_RDWR Returns: If the open() system call succeeds the method returns this. If the call fails, then it returns a null pointer. SerialStreamBuf& LibSerial::SerialStreamBuf::operator= (const SerialStreamBuf &) [private] virtual int_type LibSerial::SerialStreamBuf::overflow (int_type c) [protected], [virtual] Writes the specified character to the associated serial port. Returns: The character c. const ParityEnum LibSerial::SerialStreamBuf::Parity () const Get the current parity setting for the serial port. Returns: The parity setting for the serial port. virtual int_type LibSerial::SerialStreamBuf::pbackfail (int_type c = traits_type::eof()) [protected], [virtual] This function is called when a putback of a character fails. This must be implemented for unbuffered I/O as all streambuf subclasses are required to provide putback of at least on character. const BaudRateEnum LibSerial::SerialStreamBuf::SetBaudRate (const BaudRateEnum baudRate) If is_open() != true, return -1. Otherwise, set the baud rate of the associated serial port. Return the baud rate on success and BAUD_INVALID on failure. virtual std::streambuf* LibSerial::SerialStreamBuf::setbuf (char_type *, std::streamsize) [protected], [virtual] Performs an operation that is defined separately for each class derived from streambuf. The default behavior is to do nothing if gptr() is non-null and gptr()!=egptr(). Also, setbuf(0, 0) usually means unbuffered I/O and setbuf(p, n) means use p[0]...p[n-1] to hold the buffered characters. In general, this method implements the subclass's notion of getting memory for the buffered characters. In the case of SerialStreamBuf, we want to keep using unbuffered I/O. Hence, using this method has no effect at present. const CharSizeEnum LibSerial::SerialStreamBuf::SetCharSize (const CharSizeEnum charSize) Set the character size to be used during serial communication. It returns the character size on success and CHAR_SIZE_INVALID on failure. const FlowControlEnum LibSerial::SerialStreamBuf::SetFlowControl (const FlowControlEnum flowControlType) Use the specified flow control. short LibSerial::SerialStreamBuf::SetNumOfStopBits (short numOfStopBits) Set the number of stop bits used during serial communication. The only valid values are 1 and 2. Parameters: stop_bits The number of stop bits. (1 or 2). Returns: The number of stop bits or -1 on failure. int LibSerial::SerialStreamBuf::SetParametersToDefault () Initialize the serial communication parameters to their default values. const ParityEnum LibSerial::SerialStreamBuf::SetParity (const ParityEnum parityType) Set the parity for serial communication. Parameters: parity The parity value. const short LibSerial::SerialStreamBuf::SetVMin (short vtime) Set the minimum number of characters for non-canonical reads. See VMIN in man termios(3). const short LibSerial::SerialStreamBuf::SetVTime (short vtime) Set character buffer timeout in 10ths of a second. This applies to non-canonical reads. virtual std::streamsize LibSerial::SerialStreamBuf::showmanyc () [protected], [virtual] Check, wether input is available on the port. If you call SerialStream::in_avail, this method will be called to check for available input. while( serial_port.rdbuf()->in_avail() > 0 ) { serial_port.get(ch); ... } virtual int_type LibSerial::SerialStreamBuf::uflow () [protected], [virtual] Reads and returns the next character from the associated serial port if one otherwise returns traits::eof(). This method is used for unbuffered I/O while underflow() is called for unbuffered I/O. Returns: The next character from the serial port. virtual int_type LibSerial::SerialStreamBuf::underflow () [protected], [virtual] Reads and returns the next character from the associated serial port if one otherwise returns traits::eof(). This method is used for buffered I/O while uflow() is called for unbuffered I/O. Returns: The next character from the serial port. const short LibSerial::SerialStreamBuf::VMin () const Get the VMIN value for the device. This represents the minimum number of characters for non-canonical reads. const short LibSerial::SerialStreamBuf::VTime () const Get the current timeout value for non-canonical reads in deciseconds. virtual std::streamsize LibSerial::SerialStreamBuf::xsgetn (char_type * s, std::streamsize n) [protected], [virtual] Reads upto n characters from the serial port and returns them through the character array located at s. Returns: The number of characters actually read from the serial port. virtual std::streamsize LibSerial::SerialStreamBuf::xsputn (const char_type * s, std::streamsize n) [protected], [virtual] Writes upto n characters from the character sequence at s to the serial port associated with the buffer. Returns: The number of characters that were successfully written to the serial port.
Member Data Documentation const char LibSerial::SerialStreamBuf::CTRL_Q = 0x11 [static], [protected] Character used to signal that I/O can start while using software flow control with the serial port. Definition at line 428 of file SerialStreamBuf.h. const char LibSerial::SerialStreamBuf::CTRL_S = 0x13 [static], [protected] Character used to signal that I/O should stop while using software flow control with the serial port. Definition at line 434 of file SerialStreamBuf.h. const BaudRateEnum LibSerial::SerialStreamBuf::DEFAULT_BAUD [static] The default value of the baud rate of the serial port. Deprecated Please use SerialPort::BAUD_DEFAULT instead. Definition at line 160 of file SerialStreamBuf.h. const CharSizeEnum LibSerial::SerialStreamBuf::DEFAULT_CHAR_SIZE [static] The default value of the character size used during the serial communication. Deprecated Please use SerialPort::CHAR_SIZE_DEFAULT instead. Definition at line 169 of file SerialStreamBuf.h. const FlowControlEnum LibSerial::SerialStreamBuf::DEFAULT_FLOW_CONTROL [static] The default flow control setting. Deprecated Please use SerialPort::FLOW_CONTROL_DEFAULT instead. Definition at line 193 of file SerialStreamBuf.h. const short LibSerial::SerialStreamBuf::DEFAULT_NO_OF_STOP_BITS [static] The default number of stop bits used. Deprecated Please use SerialPort::STOP_BITS_DEFAULT instead. Definition at line 177 of file SerialStreamBuf.h. const ParityEnum LibSerial::SerialStreamBuf::DEFAULT_PARITY [static] The default parity setting. Deprecated Please use SerialPort::PARITY_DEFAULT instead. Definition at line 185 of file SerialStreamBuf.h. const short LibSerial::SerialStreamBuf::DEFAULT_VMIN [static] The default character buffer size. Deprecated VMIN and VTIME will not be supported starting from version 0.7.0. Methods of SerialPort class provide better mechanisms for implementing read and write timeouts. Definition at line 203 of file SerialStreamBuf.h. const short LibSerial::SerialStreamBuf::DEFAULT_VTIME [static] The default character buffer timing. Deprecated VMIN and VTIME will not be supported starting from version 0.7.0. Methods of SerialPort class provide better mechanisms for implementing read and write timeouts. Definition at line 213 of file SerialStreamBuf.h. boost::scoped_ptr<Implementation> LibSerial::SerialStreamBuf::mImpl [private] Definition at line 532 of file SerialStreamBuf.h.
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Version 0.6.0rc3 Sat Oct 24 2015 LibSerial::SerialStreamBuf(3)
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LibSerial_SerialStreamBuf(3) referred by
refer to termios(3)