This issue is fixed on Python 3.7+ by default
This is definatly a tricky hack: answer is to iterate through already opened file descriptors, just before using the subprocess
module.
def _hack_windows_subprocess():
"""HACK: python 2.7 file descriptors.
This magic hack fixes https://bugs.python.org/issue19575
by adding HANDLE_FLAG_INHERIT to all already opened file descriptors.
"""
# See https://github.com/secdev/scapy/issues/1136
import stat
from ctypes import windll, wintypes
from msvcrt import get_osfhandle
HANDLE_FLAG_INHERIT = 0x00000001
for fd in range(100):
try:
s = os.fstat(fd)
except:
continue
if stat.S_ISREG(s.st_mode):
handle = wintypes.HANDLE(get_osfhandle(fd))
mask = wintypes.DWORD(HANDLE_FLAG_INHERIT)
flags = wintypes.DWORD(0)
windll.kernel32.SetHandleInformation(handle, mask, flags)
Here is a sample that would crash without it:
import os, subprocess
f = open("a.txt", "w")
subprocess.Popen(["cmd"], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
f.close()
os.remove(f.name)
Traceback (most recent call last):
File "stdin", line 1, in module
WindowsError: [Error 32] Le processus ne peut pas accúder au
fichier car ce fichier est utilisú par un autre processus: 'a.txt'
Now with the fix:
import os, subprocess
f = open("a.txt", "w")
_hack_windows_subprocess()
subprocess.Popen(["cmd"], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
f.close()
os.remove(f.name)
Works.
Hope i helped
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