termios
— POSIX 样式 tty 控制
¶
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 termios style tty I/O control (and then only if configured at installation time).
本模块中的所有函数接受文件描述符
fd
作为其第 1 自变量。这可以是整数文件描述符，譬如返回通过
sys.stdin.fileno()
，或
文件对象
，譬如
sys.stdin
本身。
This module also defines all the constants needed to work with the functions provided here; these have the same name as their counterparts in C. Please refer to your system documentation for more information on using these terminal control interfaces.
模块定义了下列函数：
termios.
tcgetattr
(
fd
)
¶
Return a list containing the tty attributes for file descriptor
fd
, as follows:
[iflag, oflag, cflag, lflag, ispeed, ospeed, cc]
where
cc
is a list of the tty special characters (each a string of length 1, except the items with indices
VMIN
and
VTIME
, which are integers when these fields are defined). The interpretation of the flags and the speeds as well as the indexing in the
cc
array must be done using the symbolic constants defined in the
termios
模块。
termios.
tcsetattr
(
fd
,
当
,
属性
)
¶
Set the tty attributes for file descriptor
fd
从
属性
, which is a list like the one returned by
tcgetattr()
。
当
argument determines when the attributes are changed:
TCSANOW
to change immediately,
TCSADRAIN
to change after transmitting all queued output, or
TCSAFLUSH
to change after transmitting all queued output and discarding all queued input.
termios.
tcsendbreak
(
fd
,
duration
)
¶
Send a break on file descriptor fd . A zero duration sends a break for 0.25 –0.5 seconds; a nonzero duration has a system dependent meaning.
termios.
tcdrain
(
fd
)
¶
Wait until all output written to file descriptor fd has been transmitted.
termios.
tcflush
(
fd
,
queue
)
¶
Discard queued data on file descriptor
fd
。
queue
selector specifies which queue:
TCIFLUSH
for the input queue,
TCOFLUSH
for the output queue, or
TCIOFLUSH
for both queues.
termios.
tcflow
(
fd
,
action
)
¶
挂起 (或再继续) 输入/输出对于文件描述符
fd
。
action
自变量可以是
TCOOFF
以挂起输出，
TCOON
以重启输出，
TCIOFF
以挂起输入，或
TCION
以重启输入。
另请参阅
tty
Here’s a function that prompts for a password with echoing turned off. Note the technique using a separate
tcgetattr()
call and a
try
...
finally
statement to ensure that the old tty attributes are restored exactly no matter what happens:
def getpass(prompt="Password: "): import 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 = input(prompt) finally: termios.tcsetattr(fd, termios.TCSADRAIN, old) return passwd