Python3 os.dup2 () method
Python3 OS file / directory methods
Outline
os.dup2 () method is used to copy a file descriptor fd to another fd2.
Unix, is available on Windows.
grammar
dup2 () method syntax is as follows:
os.dup2(fd, fd2);
parameter
fd - the file descriptor to be copied
fd2 - Copy file descriptor
return value
No return value.
Examples
The following example demonstrates dup2 () method of use:
#!/usr/bin/python3
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 above program output is:
读取的字符串是 : This is test 关闭文件成功!!