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gh-85283: Build fcntl extension with the limited C API (#116791)

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Original file line number	Diff line number	Diff line change
`@@ -1460,8 +1460,8 @@ Build Changes`
`1460`	`1460`	`* Building CPython now requires a compiler with support for the C11 atomic`
`1461`	`1461`	`library, GCC built-in atomic functions, or MSVC interlocked intrinsics.`
`1462`	`1462`
`1463`		-* The ``errno``, ``md5``, ``resource``, ``winsound``, ``_ctypes_test``,
`1464`		- ``_multiprocessing.posixshmem``, ``_scproxy``, ``_stat``,
	`1463`	+* The ``errno``, ``fcntl``, ``grp``, ``md5``, ``resource``, ``winsound``,
	`1464`	+ ``_ctypes_test``, ``_multiprocessing.posixshmem``, ``_scproxy``, ``_stat``,
`1465`	`1465`	``_testimportmultiple`` and ``_uuid`` C extensions are now built with the
`1466`	`1466`	:ref:`limited C API<limited-c-api>`.
`1467`	`1467`	(Contributed by Victor Stinner in:gh:`85283`.)

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`@@ -0,0 +1,2 @@`
	`1`	+The ``fcntl`` and ``grp`` C extensions are now built with the:ref:`limited
	`2`	+C API <limited-c-api>`. (Contributed by Victor Stinner in:gh:`85283`.)

Lines changed: 33 additions & 16 deletions

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`@@ -1,22 +1,25 @@`
`1`	`1`	`/* fcntl module */`
`2`	`2`
`3`		`-#ifndefPy_BUILD_CORE_BUILTIN`
`4`		`-# definePy_BUILD_CORE_MODULE 1`
	`3`	`+// Need limited C API version 3.13 for PyLong_AsInt()`
	`4`	`+#include"pyconfig.h"// Py_GIL_DISABLED`
	`5`	`+#ifndefPy_GIL_DISABLED`
	`6`	`+# definePy_LIMITED_API 0x030d0000`
`5`	`7`	`#endif`
`6`	`8`
`7`	`9`	`#include"Python.h"`
`8`	`10`
	`11`	`+#include<errno.h>// EINTR`
	`12`	`+#include<fcntl.h>// fcntl()`
	`13`	`+#include<string.h>// memcpy()`
	`14`	`+#include<sys/ioctl.h>// ioctl()`
`9`	`15`	`#ifdefHAVE_SYS_FILE_H`
`10`		`-#include<sys/file.h>`
	`16`	`+#include<sys/file.h>// flock()`
`11`	`17`	`#endif`
`12`	`18`	`#ifdefHAVE_LINUX_FS_H`
`13`		`-#include<linux/fs.h>`
	`19`	`+#include<linux/fs.h>`
`14`	`20`	`#endif`
`15`		`-`
`16`		`-#include<sys/ioctl.h>`
`17`		`-#include<fcntl.h>`
`18`	`21`	`#ifdefHAVE_STROPTS_H`
`19`		`-#include<stropts.h>`
	`22`	`+#include<stropts.h>// I_FLUSHBAND`
`20`	`23`	`#endif`
`21`	`24`
`22`	`25`	`/*[clinic input]`

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