Python | os.fdatasync() method

OS module in Python provides functions for interacting with the operating system. OS comes under Python’s standard utility modules. This module provides a portable way of using operating system dependent functionality.

os.fdatasync() method in Python is used to force write of the file associated with the given file descriptor. Unlike os.fsync() method, it does not force update of metadata.
os.fdatasync() method is faster than os.fsync() method because it needs to force only one disk write instead of two.

Syntax: os.fdatasync(fd)

Parameter:
fd: A file descriptor for which data is to be written.

Return type: This method does not return any value.

Code: Use of os.fdatasync() method

# Python program to explain os.fdatasync() method

# importing os module
import os


# File path
path = 'file.txt'

# Open the file and get
# the file descriptor
# associated with
# using os.open() method
fd = os.open(path, os.O_RDWR)


# Write a bytestring
str = b"GeeksforGeeks"

os.write(fd, str)


# The written string is
# available in program buffer
# but it might not actually
# written to disk until
# program is closed or
# file descriptor is closed.

# sync. all internal buffers
# associated with the file descriptor
# with disk (force write of file)
# using os.fdatasync() method
os.fdatasync(fd)
print("Force write of file committed successfully")

# Close the file descriptor
os.close(fd)

# os.fdatasync() method
# does not force update of
# metadata. if you want to
# update it too, use
# os.fsync() method instead.

Output:

Force write of file committed successfully

Reference: https://docs.python.org/3/library/os.html#os.fdatasync