Python Tutorial ( PDFDrive )

Parameters
• fd -- This is the original file descriptor.
Return Value
This method returns a duplicate of file descriptor.
Example
The following example shows the usage of dup() method.
#!/usr/bin/python
import os, sys
# Open a file
fd = os.open( "foo.txt", os.O_RDWR|os.O_CREAT )
# Get one duplicate file descriptor
d_fd = os.dup( fd )
# Write one string using duplicate fd
os.write(d_fd, "This is test")
# Close a single opened file
os.closerange( fd, d_fd)
print "Closed all the files successfully!!"
Let us compile and run the above program, this will produce the following result:
Closed all the files successfully!!
os.dup2(fd, fd2)
Description
The method dup2() duplicates file descriptor fd to fd2, closing the latter first if necessary.
Note: New file description would be assigned only when it is available. In the following example given below,
1000 would be assigned as a duplicate fd in case when 1000 is available.
Syntax
Following is the syntax for dup2() method:
os.dup2(fd, fd2);
Parameters
• fd -- This is File descriptor to be duplicated.
• fd2 -- This is Duplicate file descriptor.
Return Value
This method returns a duplicate of file descriptor.
TUTORIALS POINT
Simply Easy Learning