PermissionError：[Errno 1]写后读取时，Python中不允许进行此操作

Question

I encountered following problem while writing my program: I have binary file, via which 2 processes are communicating, one of them is my python program. I open file with os:

self.io_file = os.open(med_file, os.O_RDWR)

so I can read it binary. I read content of the file, then try to write answer into the same file (I'm at the end of file, of course). Everything's alright up until I try to read again (new question) after this write. Then following happens:

Traceback (most recent call last):
File "/home/ydenko/program.py", line 172, in read
return os.read(self.io_file, msg_size)
PermissionError: [Errno 1] Operation not permitted

I find it curious that up until I write something, everything works flawlessly. Any idea why this happens?

Answer 1

• Check if you have write permission to that directory
• Check if the system is mounted in rw mode
• Also check lsattr if somebody has set the extended attributes