Python termios.VEOF屬性代碼示例

# 需要導入模塊: import termios [as 別名]
# 或者: from termios import VEOF [as 別名]
def sendeof(self):

        """This sends an EOF to the child. This sends a character which causes
        the pending parent output buffer to be sent to the waiting child
        program without waiting for end-of-line. If it is the first character
        of the line, the read() in the user program returns 0, which signifies
        end-of-file. This means to work as expected a sendeof() has to be
        called at the beginning of a line. This method does not send a newline.
        It is the responsibility of the caller to ensure the eof is sent at the
        beginning of a line. """

        ### Hmmm... how do I send an EOF?
        ###C  if ((m = write(pty, *buf, p - *buf)) < 0)
        ###C      return (errno == EWOULDBLOCK) ? n : -1;
        #fd = sys.stdin.fileno()
        #old = termios.tcgetattr(fd) # remember current state
        #attr = termios.tcgetattr(fd)
        #attr[3] = attr[3] | termios.ICANON # ICANON must be set to recognize EOF
        #try: # use try/finally to ensure state gets restored
        #    termios.tcsetattr(fd, termios.TCSADRAIN, attr)
        #    if hasattr(termios, 'CEOF'):
        #        os.write (self.child_fd, '%c' % termios.CEOF)
        #    else:
        #        # Silly platform does not define CEOF so assume CTRL-D
        #        os.write (self.child_fd, '%c' % 4)
        #finally: # restore state
        #    termios.tcsetattr(fd, termios.TCSADRAIN, old)
        if hasattr(termios, 'VEOF'):
            char = termios.tcgetattr(self.child_fd)[6][termios.VEOF]
        else:
            # platform does not define VEOF so assume CTRL-D
            char = chr(4)
        self.send(char) 

# 需要導入模塊: import termios [as 別名]
# 或者: from termios import VEOF [as 別名]
def _make_eof_intr():
    """Set constants _EOF and _INTR.

    This avoids doing potentially costly operations on module load.
    """
    global _EOF, _INTR
    if (_EOF is not None) and (_INTR is not None):
        return

    # inherit EOF and INTR definitions from controlling process.
    try:
        from termios import VEOF, VINTR
        try:
            fd = sys.__stdin__.fileno()
        except ValueError:
            # ValueError: I/O operation on closed file
            fd = sys.__stdout__.fileno()
        intr = ord(termios.tcgetattr(fd)[6][VINTR])
        eof = ord(termios.tcgetattr(fd)[6][VEOF])
    except (ImportError, OSError, IOError, ValueError, termios.error):
        # unless the controlling process is also not a terminal,
        # such as cron(1), or when stdin and stdout are both closed.
        # Fall-back to using CEOF and CINTR. There
        try:
            from termios import CEOF, CINTR
            (intr, eof) = (CINTR, CEOF)
        except ImportError:
            #                         ^C, ^D
            (intr, eof) = (3, 4)

    _INTR = _byte(intr)
    _EOF = _byte(eof) 

# 需要導入模塊: import termios [as 別名]
# 或者: from termios import VEOF [as 別名]
def _make_eof_intr():
    """Set constants _EOF and _INTR.
    
    This avoids doing potentially costly operations on module load.
    """
    global _EOF, _INTR
    if (_EOF is not None) and (_INTR is not None):
        return

    # inherit EOF and INTR definitions from controlling process.
    try:
        from termios import VEOF, VINTR
        try:
            fd = sys.__stdin__.fileno()
        except ValueError:
            # ValueError: I/O operation on closed file
            fd = sys.__stdout__.fileno()
        intr = ord(termios.tcgetattr(fd)[6][VINTR])
        eof = ord(termios.tcgetattr(fd)[6][VEOF])
    except (ImportError, OSError, IOError, ValueError, termios.error):
        # unless the controlling process is also not a terminal,
        # such as cron(1), or when stdin and stdout are both closed.
        # Fall-back to using CEOF and CINTR. There
        try:
            from termios import CEOF, CINTR
            (intr, eof) = (CINTR, CEOF)
        except ImportError:
            #                         ^C, ^D
            (intr, eof) = (3, 4)
    
    _INTR = _byte(intr)
    _EOF = _byte(eof) 

# 需要導入模塊: import termios [as 別名]
# 或者: from termios import VEOF [as 別名]
def _make_eof_intr():
    """Set constants _EOF and _INTR.
    
    This avoids doing potentially costly operations on module load.
    """
    global _EOF, _INTR
    if (_EOF is not None) and (_INTR is not None):
        return

    # inherit EOF and INTR definitions from controlling process.
    try:
        from termios import VEOF, VINTR
        fd = None
        for name in 'stdin', 'stdout':
            stream = getattr(sys, '__%s__' % name, None)
            if stream is None or not hasattr(stream, 'fileno'):
                continue
            try:
                fd = stream.fileno()
            except ValueError:
                continue
        if fd is None:
            # no fd, raise ValueError to fallback on CEOF, CINTR
            raise ValueError("No stream has a fileno")
        intr = ord(termios.tcgetattr(fd)[6][VINTR])
        eof = ord(termios.tcgetattr(fd)[6][VEOF])
    except (ImportError, OSError, IOError, ValueError, termios.error):
        # unless the controlling process is also not a terminal,
        # such as cron(1), or when stdin and stdout are both closed.
        # Fall-back to using CEOF and CINTR. There
        try:
            from termios import CEOF, CINTR
            (intr, eof) = (CINTR, CEOF)
        except ImportError:
            #                         ^C, ^D
            (intr, eof) = (3, 4)
    
    _INTR = _byte(intr)
    _EOF = _byte(eof)

# setecho and setwinsize are pulled out here because on some platforms, we need
# to do this from the child before we exec() 

# 需要導入模塊: import termios [as 別名]
# 或者: from termios import VEOF [as 別名]
def write(self):
        """ attempt to get a chunk of data to write to our child process's
        stdin, then write it.  the return value answers the questions "are we
        done writing forever?" """

        # get_chunk may sometimes return bytes, and sometimes return strings
        # because of the nature of the different types of STDIN objects we
        # support
        try:
            chunk = self.get_chunk()
            if chunk is None:
                raise DoneReadingForever

        except DoneReadingForever:
            self.log.debug("done reading")

            if self.tty_in:
                # EOF time
                try:
                    char = termios.tcgetattr(self.stream)[6][termios.VEOF]
                except:
                    char = chr(4).encode()

                # normally, one EOF should be enough to signal to an program
                # that is read()ing, to return 0 and be on your way.  however,
                # some programs are misbehaved, like python3.1 and python3.2.
                # they don't stop reading sometimes after read() returns 0.
                # this can be demonstrated with the following program:
                #
                # import sys
                # sys.stdout.write(sys.stdin.read())
                #
                # then type 'a' followed by ctrl-d 3 times.  in python
                # 2.6,2.7,3.3,3.4,3.5,3.6, it only takes 2 ctrl-d to terminate.
                # however, in python 3.1 and 3.2, it takes all 3.
                #
                # so here we send an extra EOF along, just in case.  i don't
                # believe it can hurt anything
                os.write(self.stream, char)
                os.write(self.stream, char)

            return True

        except NotYetReadyToRead:
            self.log.debug("received no data")
            return False

        # if we're not bytes, make us bytes
        if IS_PY3 and hasattr(chunk, "encode"):
            chunk = chunk.encode(self.encoding)

        for proc_chunk in self.stream_bufferer.process(chunk):
            self.log.debug("got chunk size %d: %r", len(proc_chunk),
                    proc_chunk[:30])

            self.log.debug("writing chunk to process")
            try:
                os.write(self.stream, proc_chunk)
            except OSError:
                self.log.debug("OSError writing stdin chunk")
                return True