Python os.pipe() Method

Description

The method pipe() creates a pipe and return a pair of file descriptors (r, w) usable for reading and writing, respectively

Syntax

Following is the syntax for pipe() method

os.pipe()

Parameters

Return Value

This method returns a pair of file descriptors.

Example

The following example shows the usage of pipe() method.

#!/usr/bin/python

import os, sys

print "The child will write text to a pipe and "
print "the parent will read the text written by child..."

# file descriptors r, w for reading and writing
r, w = os.pipe() 

processid = os.fork()
if processid:
    # This is the parent process 
    # Closes file descriptor w
    os.close(w)
    r = os.fdopen(r)
    print "Parent reading"
    str = r.read()
    print "text =", str   
    sys.exit(0)
else:
    # This is the child process
    os.close(r)
    w = os.fdopen(w, 'w')
    print "Child writing"
    w.write("Text written by child...")
    w.close()
    print "Child closing"
    sys.exit(0)

Let us compile and run the above program, this will produce the following result:

The child will write text to a pipe and
the parent will read the text written by child...
Parent reading
Child writing
Child closing
text = Text written by child...