pipe() 方法创建一个管道,并返回一对文件描述符(r, w)可用的用于读取和写入,
语法
以下是 pipe() 方法的语法:
os.pipe()
参数
-
NA
返回值
该方法返回一对文件描述符。
示例
下面的示例显示 pipe() 方法的使用。
#!/usr/bin/python3
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)
当我们运行上面的程序,它会产生以下结果:
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...
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