What is the Python os.dup2() method? What role can os.dup2 play?

In today’s article, let’s learn about the Python os.dup2() method. In the next article, I will introduce the os.dup2() method in python. Maybe you have never seen it. I have seen or used this method. In this article, I will explain the definition of the dup2() method and dup2 usage.

Overview

The os.dup2() method is used to copy one file descriptor fd to another fd2.

Available on Unix, Windows.

Grammar

##The dup2() method syntax format is as follows:

os.dup2(fd, fd2);

Parameters

fd -- The file descriptor to be copied

fd2 -- The file descriptor to be copied

(No return value.)

Example

The following example demonstrates the use of the dup2() method:

#!/usr/bin/python
# -*- coding: UTF-8 -*-
import os, sys
# 打开文件
fd = os.open( "foo.txt", os.O_RDWR|os.O_CREAT )
# 写入字符串
os.write(fd, "This is test")
# 文件描述符为 1000
fd2 = 1000
os.dup2(fd, fd2);
# 在新的文件描述符上插入数据
os.lseek(fd2, 0, 0)
str = os.read(fd2, 100)
print "读取的字符串是 : ", str
# 关闭文件
os.close( fd )
print "关闭文件成功!!"

The output result of executing the above program is:

读取的字符串是 :  This is test
关闭文件成功!!

The above is all the content of this article . I hope that what I said and the examples given will be helpful to you in learning python.

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