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GH-93312: Add os.PIDFD_NONBLOCK #93313

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Merged
merged 3 commits into from
May 31, 2022
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GH-93312: Add os.PIDFD_NONBLOCK #93313

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ddb1eb6
add PIDFD_NONBLOCK
kumaraditya303 May 28, 2022
8a74c00
📜🤖 Added by blurb_it.
blurb-it[bot] May 28, 2022
4ff2d21
fix docs
kumaraditya303 May 31, 2022
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17 changes: 13 additions & 4 deletions Doc/library/os.rst
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Expand Up @@ -3897,16 +3897,25 @@ written in Python, such as a mail server's external command delivery program.

.. function:: pidfd_open(pid, flags=0)

Return a file descriptor referring to the process *pid*. This descriptor can
be used to perform process management without races and signals. The *flags*
argument is provided for future extensions; no flag values are currently
defined.
Return a file descriptor referring to the process *pid* with *flags* set.
This descriptor can be used to perform process management without races
and signals.

See the :manpage:`pidfd_open(2)` man page for more details.

.. availability:: Linux 5.3+
.. versionadded:: 3.9

.. data:: PIDFD_NONBLOCK

This flag indicates that the file descriptor will be non-blocking.
If the process referred to by the file descriptor has not yet terminated,
then an attempt to wait on the file descriptor using :manpage:`waitid(2)`
will immediately return the error :data:`~errno.EAGAIN` rather than blocking.

.. availability:: Linux 5.10+
.. versionadded:: 3.12


.. function:: plock(op)

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7 changes: 7 additions & 0 deletions Doc/whatsnew/3.12.rst
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Expand Up @@ -90,6 +90,13 @@ New Modules
Improved Modules
================

os
--

* Add :data:`os.PIDFD_NONBLOCK` to open a file descriptor
for a process with :func:`os.pidfd_open` in non-blocking mode.
(Contributed by Kumar Aditya in :gh:`93312`.)


Optimizations
=============
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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Library/2022-05-28-08-02-55.gh-issue-93312.HY0Uzj.rst
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@@ -0,0 +1,3 @@
Add :data:`os.PIDFD_NONBLOCK` flag to open a file descriptor
for a process with :func:`os.pidfd_open` in non-blocking mode.
Patch by Kumar Aditya.
3 changes: 3 additions & 0 deletions Modules/posixmodule.c
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Expand Up @@ -15255,6 +15255,9 @@ all_ins(PyObject *m)
#ifdef P_PIDFD
if (PyModule_AddIntMacro(m, P_PIDFD)) return -1;
#endif
#ifdef PIDFD_NONBLOCK
if (PyModule_AddIntMacro(m, PIDFD_NONBLOCK)) return -1;
#endif
#endif
#ifdef WEXITED
if (PyModule_AddIntMacro(m, WEXITED)) return -1;
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