Python os.fsync() 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 fsync() method.

Python os fsync() method forces write of file with file descriptor fd to disk. If you are starting with a Python file object f, you first have to do f.flush(), then followed by os.fsync(f.fileno()), to ensure that all internal buffers associated with f are written to disk.

Syntax

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

os.fsync( fd );

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Parameter Details

• fd - File descriptor for buffer sync.

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 fsync() method.
# Infact here you would not be able to see its effect.
os.fsync(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 ftruncate() Method.

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