Module « fcntl » Python 3.11.3

Fonction ioctl - module fcntl

Signature de la fonction ioctl

def ioctl(fd, request, arg=0, mutate_flag=True) 

Description

help(fcntl.ioctl)

Perform the operation `request` on file descriptor `fd`.

The values used for `request` are operating system dependent, and are available
as constants in the fcntl or termios library modules, using the same names as
used in the relevant C header files.

The argument `arg` is optional, and defaults to 0; it may be an int or a
buffer containing character data (most likely a string or an array).

If the argument is a mutable buffer (such as an array) and if the
mutate_flag argument (which is only allowed in this case) is true then the
buffer is (in effect) passed to the operating system and changes made by
the OS will be reflected in the contents of the buffer after the call has
returned.  The return value is the integer returned by the ioctl system
call.

If the argument is a mutable buffer and the mutable_flag argument is false,
the behavior is as if a string had been passed.

If the argument is an immutable buffer (most likely a string) then a copy
of the buffer is passed to the operating system and the return value is a
string of the same length containing whatever the operating system put in
the buffer.  The length of the arg buffer in this case is not allowed to
exceed 1024 bytes.

If the arg given is an integer or if none is specified, the result value is
an integer corresponding to the return value of the ioctl call in the C
code.