匿名管道

管道是一个单向通道,有点类似共享内存缓存.管道有两端,包括输入端和输出端.对于一个进程的而言,它只能看到管道一端,即要么是输入端要么是输出端.

os.pipe()返回2个文件描述符(r, w),表示可读的和可写的.示例代码如下:

复制代码 代码如下:

!/usr/bin/python

import time
import os

def child(wpipe):
print('hello from child', os.getpid())
while True:
msg = 'how are you\n'.encode()
os.write(wpipe, msg)
time.sleep(1)

def parent():
rpipe, wpipe = os.pipe()
pid = os.fork()
if pid == 0:
child(wpipe)
assert False, 'fork child process error!'
else:
os.close(wpipe)
print('hello from parent', os.getpid(), pid)
fobj = os.fdopen(rpipe, 'r')
while True:
recv = os.read(rpipe, 32)
print recv

parent()