CODEWITHSUNDEEP
pythonlinuxfork
timthelion
timthelion

Reputation: 2737

Using python's with with os.fork

I'm currious as to know if the behavior of with with os.fork is defined somehow in the python specification and how I should use with with os.fork.

If I do, for example:

import tempfile
import os
with tempfile.TemporaryDirectory() as dir:
  pid = os.fork()
  print(pid)
  print(dir)

Then it seems to be using the naive behavior of deleting the TemporaryDirectory twice:

> python3 foo.py
27023
/tmp/tmpg1typbde
0
/tmp/tmpg1typbde
Traceback (most recent call last):
  File "foo.py", line 6, in <module>
    print(dir)
  File "/usr/lib/python3.4/tempfile.py", line 824, in __exit__
    self.cleanup()
  File "/usr/lib/python3.4/tempfile.py", line 828, in cleanup
    _rmtree(self.name)
  File "/usr/lib/python3.4/shutil.py", line 467, in rmtree
    onerror(os.rmdir, path, sys.exc_info())
  File "/usr/lib/python3.4/shutil.py", line 465, in rmtree
    os.rmdir(path)
FileNotFoundError: [Errno 2] No such file or directory: '/tmp/tmpg1typbde'

I'm wondering:

  1. If the behavior is actually defined
  2. How best should I share a temporary directory between two processes

Upvotes: 1

Views: 373

Answers (1)

timthelion
timthelion

Reputation: 2737

Not using with, and doing this the dirty old way works.

> cat foo.py
import tempfile
import os
import shutil
temp_dir = tempfile.mkdtemp(prefix="foo")
pid = os.fork()
print(pid)
print(temp_dir)
if not pid:
  input("pid: %s\nPress enter to continue."%pid)
if pid:
  print("pid: %s\nWaiting for other pid to exit."%pid)
  os.waitpid(pid,0)
  shutil.rmtree(temp_dir)
  print("Bye")

.

> python3 foo.py
27510
/tmp/foopyvuuwjw
pid: 27510
Waiting for other pid to exit.
0
/tmp/foopyvuuwjw
pid: 0
Press enter to continue.
Bye

Upvotes: 1

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