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.
A file descriptor is small integer value that corresponds to a file or other input/output resource, such as a pipe or network socket. A File descriptor is an abstract indicator of a resource and act as handle to perform various lower level I/O operations like read, write, send etc.
For Example: Standard input is usually file descriptor with value 0, standard output is usually file descriptor with value 1 and standard error is usually file descriptor with value 2.
Further files opened by the current process will get the value 3, 4, 5 an so on.
os.dup() method in Python is used to duplicate the given file descriptor. The duplicated file descriptor is non-inheritable, But on Windows platform, file descriptor associated with standard stream (standard input : 0, standard output : 1, standard error : 2) which can be inherited by child processes.
Inheritable file descriptor means if the parent process has a file descriptor 4 in use for a particular file and parent creates a child process then the child process will also have file descriptor 4 in use for that same file.
fd: A file descriptor, which is to be duplicated.
Return Type: This method returns the duplicated file descriptor, which is an integer value.
os.dup()method to duplicate a file descriptor
Original file descriptor: 3 Duplicated file descriptor: 4 total 0 lrwx------ 1 ihritik ihritik 64 Jun 14 06:45 0 -> /dev/pts/0 lrwx------ 1 ihritik ihritik 64 Jun 14 06:45 1 -> /dev/pts/0 lrwx------ 1 ihritik ihritik 64 Jun 14 06:45 2 -> /dev/pts/0 l-wx------ 1 ihritik ihritik 64 Jun 14 06:45 3 -> /home/ihritik/Desktop/file.txt l-wx------ 1 ihritik ihritik 64 Jun 14 06:45 4 -> /home/ihritik/Desktop/file.txt File descriptor duplicated successfully
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