Python os.fdatasync() Method with example

Hello dear readers! Welcome back to another section of our tutorial on Python. In this tutorial guide, we are going to be studying about the Os fdatasync() method.

The os fdatasync() method forces write of file with filedescriptor fd to disk. It does not force update of metadata. If you want to flush your buffer then you can make use of this method.

Syntax

The following below is the syntax for Python Os fdatasync() method -

os.fdatasync( fd );

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Parameter Details

• fd - The file descriptor for which data is to be written.

Return Value

It does not return any value.

Example

The following below is a simple example -

#!/usr/bin/python

import os, sys

# Open a file
fd = os.open( "foo.txt", os.O_RDWR|os.O_CREAT )

# Write one string
os.write(fd, "This is test")

# Now you can use fdatasync() method.
# Infact here you would not be able to see its effect.
os.fdatasync(fd)

# Now read this file from the beginning.
os.lseek(fd, 0, 0)
str = os.read(fd, 100)
print "Read String is : ", str

# Close opened file
os.close( fd )

print "Closed the file successfully!!"

Output

When the above code is executed, it will produce the following result -

Read String is :  This is test
Closed the file successfully!!

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Alright guys! This is where we are rounding up for this tutorial post. In our next tutorial, we are going to be studying about the Python OS fdopen() Method.

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