Python method fsync() forces write of file with file descriptor fd to disk. If you're starting with a Python file object f, first do f.flush(), and then do os.fsync(f.fileno()), to ensure that all internal buffers associated with f are written to disk.
Following is the syntax for fsync() method −
fd − This is the file descriptor for buffer sync is required.
This method does not return any value.
The following example shows the usage of fsync() method.
#!/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!!"
When we run above program, it produces following result −
Read String is : This is test Closed the file successfully!!