The Python programming language offers an
os module to interact with the operating system and perform various low-level operations such as reading files, spawning new processes, file management, environment operations, etc.
Whenever a file is opened, a file descriptor is associated with that file. A file descriptor is essentially an integer value uniquely identifying an open file on a system.
A file descriptor has an
inheritable flag that indicates if any child process can inherit that file descriptor. By default, all the file descriptors are set as
On UNIX and Windows systems,
non-inheritable file descriptors are closed inside child processes except for
inheritable file descriptors.
os module has a
set_inheritable() method that we can use to set the
inheritable flag of a valid file descriptor to a Boolean value.
||Integer||It is a file descriptor associated with a valid resource.|
||Boolean||A boolean value for the
set_inheritable() method does not return anything. Instead, it sets a file descriptor’s
inheritable flag to a boolean value.
Examples Code: Set the
inheritable Flag for a File
import os path = os.getcwd() + "/file.txt" fd = os.open(path, os.O_RDWR | os.O_CREAT) print("Inheritable Flag Status:", os.get_inheritable(fd)) os.set_inheritable(fd, True) print("Inheritable Flag Status:", os.get_inheritable(fd))
Inheritable Flag Status: False Inheritable Flag Status: True
The Python code above first defines a
path to a file. It can be a file system
path to any file, but the above code considers a file
file.txt in the current working directory.
os.getcwd() method returns a string representation for the current working directory. Next, we open the file using the
Note that if the file is missing, it is created and ultimately opened in read and write mode. Currently, the file descriptor is
inheritable (refer to the first line of the output)
Lastly, we set the
inheritable flag to
True. The second line in the output depicts the same.