os.pipe() 函数在 Python 中起什么作用?
pythonserver side programmingprogramming
os.pipe() 方法创建一个管道并返回一对文件描述符 (r, w)，分别用于读取和写入。
示例
import os, sys
print "子进程将向管道写入文本，"
print "父进程将读取子进程写入的文本..."
# 用于读取和写入的文件描述符 r, w
r, w = os.pipe()
processid = os.fork()
# 这是父进程
if processid:
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)
输出
您将获得输出:
Parent reading Child writing Child closing text = Text written by child...
