fcntl
UNIXfile control
UNIXIO control
This module performs file control and IO control on file descriptors.
It is an interface to the fcntl() and ioctl() routines.
File descriptors can be obtained with the fileno() method of a
file or socket object.
The module defines the following functions:
If the library modules FCNTL or IOCTL are missing, you
can find the opcodes in the C include files sys/fcntl and
sys/ioctl. You can create the modules yourself with the h2py
script, found in the Demo/scripts directory.
Examples (all on a SVR4 compliant system):
import struct, FCNTL
file = open(...)
rv = fcntl(file.fileno(), FCNTL.O_NDELAY, 1)
lockdata = struct.pack('hhllhh', FCNTL.F_WRLCK, 0, 0, 0, 0, 0)
rv = fcntl(file.fileno(), FCNTL.F_SETLKW, lockdata)
Note that in the first example the return value variable rv will
hold an integer value; in the second example it will hold a string
value.