https://github.com/python/cpython/commit/a565ab0fd58bcd4bbc01084b74ef704a750... commit: a565ab0fd58bcd4bbc01084b74ef704a75084274 branch: main author: Kumar Aditya <59607654+kumaraditya303@users.noreply.github.com> committer: vstinner <vstinner@python.org> date: 2022-05-31T12:51:29+02:00 summary: GH-93312: Add os.PIDFD_NONBLOCK flag (#93313) files: A Misc/NEWS.d/next/Library/2022-05-28-08-02-55.gh-issue-93312.HY0Uzj.rst M Doc/library/os.rst M Doc/whatsnew/3.12.rst M Modules/posixmodule.c diff --git a/Doc/library/os.rst b/Doc/library/os.rst index dc0f2e4158ac0..1f434a1c5b62f 100644 --- a/Doc/library/os.rst +++ b/Doc/library/os.rst @@ -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) diff --git a/Doc/whatsnew/3.12.rst b/Doc/whatsnew/3.12.rst index 8a7309726ed2a..7c560d73a5fc6 100644 --- a/Doc/whatsnew/3.12.rst +++ b/Doc/whatsnew/3.12.rst @@ -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 ============= diff --git a/Misc/NEWS.d/next/Library/2022-05-28-08-02-55.gh-issue-93312.HY0Uzj.rst b/Misc/NEWS.d/next/Library/2022-05-28-08-02-55.gh-issue-93312.HY0Uzj.rst new file mode 100644 index 0000000000000..f11d04f63532f --- /dev/null +++ b/Misc/NEWS.d/next/Library/2022-05-28-08-02-55.gh-issue-93312.HY0Uzj.rst @@ -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. diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c index 0a72aca8d51fa..6883ad0c12ccf 100644 --- a/Modules/posixmodule.c +++ b/Modules/posixmodule.c @@ -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;