Os Process Pipe

In this tutorial, you'll learn about How to Fix Inter. We cover key concepts, practical examples, and best practices.

Fix inter-process pipe errors when pipe ends not properly closed causing deadlock or hanging reads.

Quick Fix

Wrong

import os
r,w=os.pipe()
pid=os.fork()
if pid==0:
    os.close(r)
    os.write(w,b'hello')
else:
    os.close(w)
    data=os.read(r,1024)
    print(data)  # may hang!

Parent doesn't close write end. Read hangs if pipe's write end still open in parent.

Right

import os
r,w=os.pipe()
pid=os.fork()
if pid==0:
    os.close(r)
    os.write(w,b'hello')
    os.close(w)  # closes child's write end
    os._exit(0)
else:
    os.close(w)  # close parent's write end
    data=os.read(r,1024)
    os.close(r)
    print(data.decode())

'hello' printed. All unnecessary pipe ends closed. read() returns when all write ends closed.

Prevention

Close unused pipe ends in each process. Close write end in reader. Close read end in writer.

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