如何确定是否可以使用os.read（fd，[buffer [）进行读取而不会挂起？

Question

Before doing: os.read(fd,1024) I would like to check that there will be output rather than it hanging until output it received. Since fd is an int object, I can't do:

os.fstat(f.fileno()).st_size

If I could get the size, I could check it is not 0.

Sorry if this is really simple, I am new to python.

Answer 1

Use select.select . (In windows, you can only it with socket):

import select

...

r, _, _ = select.select([fd], [], [], 0)
if r:
    data = os.read(fd, 1024)