If possible, set FD_CLOEXEC flag on file descriptors opened using
TemporaryFile. This flag causes the fd to be closed on exec().
diff --git a/Lib/tempfile.py b/Lib/tempfile.py
index b981084..7492240 100644
--- a/Lib/tempfile.py
+++ b/Lib/tempfile.py
@@ -180,6 +180,17 @@
setattr(self, name, a)
return a
+try:
+ import fcntl as _fcntl
+ def _set_cloexec(fd, flag=_fcntl.FD_CLOEXEC):
+ flags = _fcntl.fcntl(fd, _fcntl.F_GETFD, 0)
+ if flags >= 0:
+ # flags read successfully, modify
+ flags |= flag
+ _fcntl.fcntl(fd, _fcntl.F_SETFD, flags)
+except (ImportError, AttributeError):
+ def _set_cloexec(fd):
+ pass
def TemporaryFile(mode='w+b', bufsize=-1, suffix=""):
"""Create and return a temporary file (opened read-write by default)."""
@@ -187,6 +198,7 @@
if os.name == 'posix':
# Unix -- be very careful
fd = os.open(name, os.O_RDWR|os.O_CREAT|os.O_EXCL, 0700)
+ _set_cloexec(fd)
try:
os.unlink(name)
return os.fdopen(fd, mode, bufsize)