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gh-127385: Add F_DUPFD_QUERY to fcntl #127386

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4 changes: 4 additions & 0 deletions Doc/library/fcntl.rst
Original file line number Diff line number Diff line change
Expand Up @@ -79,6 +79,10 @@ descriptor.
On macOS and NetBSD, the :mod:`!fcntl` module exposes the ``F_GETNOSIGPIPE``
and ``F_SETNOSIGPIPE`` constant.

.. versionchanged:: next
On Linux >= 6.1, the :mod:`!fcntl` module exposes the ``F_DUPFD_QUERY``
to query a file descriptor pointing to the same file.

The module defines the following functions:


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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Add the ``F_DUPFD_QUERY`` constant to the :mod:`fcntl` module.
3 changes: 3 additions & 0 deletions Modules/fcntlmodule.c
Original file line number Diff line number Diff line change
Expand Up @@ -565,6 +565,9 @@ all_ins(PyObject* m)
#ifdef F_NOTIFY
if (PyModule_AddIntMacro(m, F_NOTIFY)) return -1;
#endif
#ifdef F_DUPFD_QUERY
if (PyModule_AddIntMacro(m, F_DUPFD_QUERY)) return -1;
#endif
/* Old BSD flock(). */
#ifdef F_EXLCK
if (PyModule_AddIntMacro(m, F_EXLCK)) return -1;
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