Python3 os.pipe () method
Python3 OS file / directory methods
Outline
os.pipe () method is used to create a pipeline Returns a pair of file descriptors (r, w) are read and write.
grammar
pipe () method syntax is as follows:
os.pipe()
parameter
no
return value
Returns the file descriptor right.
Examples
The following example demonstrates the use of pipe () method:
#!/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...")
# 文件描述符 r, w 用于读、写
r, w = os.pipe()
processid = os.fork()
if processid:
# 父进程
# 关闭文件描述符 w
os.close(w)
r = os.fdopen(r)
print ("Parent reading")
str = r.read()
print ("text =", str)
sys.exit(0)
else:
# 子进程
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)
The above program output is:
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...