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Python program to communicate between parent and child process using the pipe.
Using fork is the easiest way to create child process.fork () is part of the os standard Python library.
Here, we solve this task by using of pipe(). For passing information from one process to another pipe() is used. For two way communication two pipes can be use, one for each direction because pipe() is unidirectional.
Algorithm
Step 1: file descriptors r, w for reading and writing. Step 2: Create a process using the fork. Step 3: if process id is 0 then create a child process. Step 4: else create parent process.
Example Code
import os
def parentchild(cwrites):
r, w = os.pipe()
pid = os.fork()
if pid:
os.close(w)
r = os.fdopen(r)
print ("Parent is reading")
str = r.read()
print( "Parent reads =", str)
else:
os.close(r)
w = os.fdopen (w, 'w')
print ("Child is writing")
w.write(cwrites)
print("Child writes = ",cwrites)
w.close()
# Driver code
cwrites = "Python Program"
parentchild(cwrites)
Output
Child is writing Child writes = Python Program Parent is reading Parent reads = Python Program
Updated on: 30-Jul-2019
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