Python | os.tcgetpgrp() method

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.

All functions in os module raise OSError in the case of invalid or inaccessible file names and paths, or other arguments that have the correct type, but are not accepted by the operating system.

In UNIX-like operating systems, a process group denotes a collection of one or more processes. It is used to control distribution of a signal that is when a signal is directed to a process group, each member of the process group receives the signal. Every process group is uniquely identified using process group id.
os.tcgetpgrp() method in Python is used to get the process group associated with the terminal given by the specified file descriptor. The specified file descriptor should be an open file descriptor as returned by os.open() method.



Note: os.tcgetpgrp() method is only available on UNIX platforms.

Syntax: os.tcgetpgrp(fd)

Parameter:
fd: A file descriptor associated with a terminal.

Return Type: This method returns an integer value which represents the process group id associated with the terminal given by the specified file descriptor.

Code: Use of os.tcgetpgrp() method

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# Python program to explain os.tcgetpgrp() method 
  
# importing os module 
import os
  
  
# Get the/dev/tty file
# and get the file descriptor
# associated with it 
# using os.open() method
  
# '/dev / tty' is a special file
# which represents the
# controlling terminal of 
# the current process
fd = os.open("/dev/tty", os.O_RDWR)
  
  
# Get the process group associated
# with the terminal given by
# the specified file descriptor
# using os.tcgetpgrp() method
pgid = os.tcgetpgrp(fd)
  
# Print the process group
# associated with the controlling
# terminal of the current process
print("Process group associated with controlling\n \
         terminal of the current process:", pgid)
  
# Close the file descriptor
os.close(fd)

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Output:

Process group associated with controlling
terminal of the current process: 19787


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