mirror of
https://github.com/python/cpython.git
synced 2025-11-03 23:21:29 +00:00
4b3f0312c9
Merged in many typo corrections and fixes to support GNU info processing; submitted by Tamito Kajiyama.
108 lines
4.1 KiB
TeX
108 lines
4.1 KiB
TeX
\section{Built-in Module \sectcode{termios}}
|
|
\bimodindex{termios}
|
|
\indexii{Posix}{I/O control}
|
|
\indexii{tty}{I/O control}
|
|
|
|
\renewcommand{\indexsubitem}{(in module termios)}
|
|
|
|
This module provides an interface to the Posix calls for tty I/O
|
|
control. For a complete description of these calls, see the Posix or
|
|
\UNIX{} manual pages. It is only available for those \UNIX{} versions
|
|
that support Posix \code{termios} style tty I/O control (and then
|
|
only if configured at installation time).
|
|
|
|
All functions in this module take a file descriptor \var{fd} as their
|
|
first argument. This must be an integer file descriptor, such as
|
|
returned by \code{sys.stdin.fileno()}.
|
|
|
|
This module should be used in conjunction with the \code{TERMIOS}
|
|
module, which defines the relevant symbolic constants (see the next
|
|
section).
|
|
|
|
The module defines the following functions:
|
|
|
|
\begin{funcdesc}{tcgetattr}{fd}
|
|
Return a list containing the tty attributes for file descriptor
|
|
\var{fd}, as follows: \code{[\var{iflag}, \var{oflag}, \var{cflag},
|
|
\var{lflag}, \var{ispeed}, \var{ospeed}, \var{cc}]} where \var{cc} is
|
|
a list of the tty special characters (each a string of length 1,
|
|
except the items with indices \code{VMIN} and \code{VTIME}, which are
|
|
integers when these fields are defined). The interpretation of the
|
|
flags and the speeds as well as the indexing in the \var{cc} array
|
|
must be done using the symbolic constants defined in the
|
|
\code{TERMIOS} module.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{tcsetattr}{fd\, when\, attributes}
|
|
Set the tty attributes for file descriptor \var{fd} from the
|
|
\var{attributes}, which is a list like the one returned by
|
|
\code{tcgetattr()}. The \var{when} argument determines when the
|
|
attributes are changed: \code{TERMIOS.TCSANOW} to change immediately,
|
|
\code{TERMIOS.TCSADRAIN} to change after transmitting all queued
|
|
output, or \code{TERMIOS.TCSAFLUSH} to change after transmitting all
|
|
queued output and discarding all queued input.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{tcsendbreak}{fd\, duration}
|
|
Send a break on file descriptor \var{fd}. A zero \var{duration} sends
|
|
a break for 0.25--0.5 seconds; a nonzero \var{duration} has a system
|
|
dependent meaning.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{tcdrain}{fd}
|
|
Wait until all output written to file descriptor \var{fd} has been
|
|
transmitted.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{tcflush}{fd\, queue}
|
|
Discard queued data on file descriptor \var{fd}. The \var{queue}
|
|
selector specifies which queue: \code{TERMIOS.TCIFLUSH} for the input
|
|
queue, \code{TERMIOS.TCOFLUSH} for the output queue, or
|
|
\code{TERMIOS.TCIOFLUSH} for both queues.
|
|
\end{funcdesc}
|
|
|
|
\begin{funcdesc}{tcflow}{fd\, action}
|
|
Suspend or resume input or output on file descriptor \var{fd}. The
|
|
\var{action} argument can be \code{TERMIOS.TCOOFF} to suspend output,
|
|
\code{TERMIOS.TCOON} to restart output, \code{TERMIOS.TCIOFF} to
|
|
suspend input, or \code{TERMIOS.TCION} to restart input.
|
|
\end{funcdesc}
|
|
|
|
\subsection{Example}
|
|
\nodename{termios Example}
|
|
|
|
Here's a function that prompts for a password with echoing turned off.
|
|
Note the technique using a separate \code{termios.tcgetattr()} call
|
|
and a \code{try \ldots{} finally} statement to ensure that the old tty
|
|
attributes are restored exactly no matter what happens:
|
|
|
|
\begin{verbatim}
|
|
def getpass(prompt = "Password: "):
|
|
import termios, TERMIOS, sys
|
|
fd = sys.stdin.fileno()
|
|
old = termios.tcgetattr(fd)
|
|
new = termios.tcgetattr(fd)
|
|
new[3] = new[3] & ~TERMIOS.ECHO # lflags
|
|
try:
|
|
termios.tcsetattr(fd, TERMIOS.TCSADRAIN, new)
|
|
passwd = raw_input(prompt)
|
|
finally:
|
|
termios.tcsetattr(fd, TERMIOS.TCSADRAIN, old)
|
|
return passwd
|
|
\end{verbatim}
|
|
|
|
|
|
\section{Standard Module \sectcode{TERMIOS}}
|
|
\stmodindex{TERMIOS}
|
|
\indexii{Posix}{I/O control}
|
|
\indexii{tty}{I/O control}
|
|
|
|
\renewcommand{\indexsubitem}{(in module TERMIOS)}
|
|
|
|
This module defines the symbolic constants required to use the
|
|
\code{termios} module (see the previous section). See the Posix or
|
|
\UNIX{} manual pages (or the source) for a list of those constants.
|
|
|
|
Note: this module resides in a system-dependent subdirectory of the
|
|
Python library directory. You may have to generate it for your
|
|
particular system using the script \file{Tools/scripts/h2py.py}.
|