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[3.14] gh-142302: Fix mkstemp() documentation: clarify file descriptor inheritance behavior (GH-142338) (#143486)

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gh-142302: Fix mkstemp() documentation: clarify file descriptor inheritance behavior (GH-142338)

The documentation incorrectly stated that the file descriptor is not
inherited by child processes. In reality, the close-on-exec flag (when
available) only prevents inheritance across exec() calls, not fork().
(cherry picked from commit e79c9b703117d8b0e7c4d86b704e2e7f120db883)

Co-authored-by: ADITYA RAI <adi.hack1234@gmail.com>
Co-authored-by: Victor Stinner <vstinner@python.org>
This commit is contained in:
Miss Islington (bot) 2026-01-06 18:14:12 +01:00 committed by GitHub
parent b9b2b3d86a
commit 22a99ca8e1
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2 changed files with 5 additions and 3 deletions
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3
Doc/library/os.rst
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@ -1961,7 +1961,8 @@ can be inherited by child processes. Since Python 3.4, file descriptors
created by Python are non-inheritable by default.
On UNIX, non-inheritable file descriptors are closed in child processes at the
execution of a new program, other file descriptors are inherited.
execution of a new program, other file descriptors are inherited. Note that
non-inheritable file descriptors are still *inherited* by child processes on :func:`os.fork`.
On Windows, non-inheritable handles and file descriptors are closed in child
processes, except for standard streams (file descriptors 0, 1 and 2: stdin, stdout

5
Doc/library/tempfile.rst
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@ -225,8 +225,9 @@ The module defines the following user-callable items:
properly implements the :const:`os.O_EXCL` flag for :func:`os.open`. The
file is readable and writable only by the creating user ID. If the
platform uses permission bits to indicate whether a file is executable,
the file is executable by no one. The file descriptor is not inherited
by child processes.
the file is executable by no one.
The file descriptor is :ref:`not inherited by child processes <fd_inheritance>`.
Unlike :func:`TemporaryFile`, the user of :func:`mkstemp` is responsible
for deleting the temporary file when done with it.