Add missing posix functions for 3.13 (#12375)

stdlib/@tests/stubtest_allowlists/darwin-py313.txt

@@ -5,15 +5,7 @@ fcntl.F_OFD_SETLK
 fcntl.F_OFD_SETLKW
 fcntl.F_RDAHEAD
 fcntl.F_SETNOSIGPIPE
-os.grantpt
-os.posix_openpt
-os.ptsname
-os.unlockpt
-posix.grantpt
-posix.posix_openpt
-posix.ptsname
 posixpath.splitroot
-posix.unlockpt
 posix.waitid
 posix.waitid_result
 readline.backend

stdlib/@tests/stubtest_allowlists/linux-py313.txt

@@ -23,30 +23,22 @@ os.TFD_CLOEXEC
 os.TFD_NONBLOCK
 os.TFD_TIMER_ABSTIME
 os.TFD_TIMER_CANCEL_ON_SET
-os.grantpt
-os.posix_openpt
-os.ptsname
 os.timerfd_create
 os.timerfd_gettime
 os.timerfd_gettime_ns
 os.timerfd_settime
 os.timerfd_settime_ns
-os.unlockpt
 posix.POSIX_SPAWN_CLOSEFROM
 posix.TFD_CLOEXEC
 posix.TFD_NONBLOCK
 posix.TFD_TIMER_ABSTIME
 posix.TFD_TIMER_CANCEL_ON_SET
-posix.grantpt
-posix.posix_openpt
-posix.ptsname
 posixpath.splitroot
 posix.timerfd_create
 posix.timerfd_gettime
 posix.timerfd_gettime_ns
 posix.timerfd_settime
 posix.timerfd_settime_ns
-posix.unlockpt
 readline.backend
 stat.SF_SUPPORTED
 stat.SF_SYNTHETIC

stdlib/os/__init__.pyi

@@ -1156,3 +1156,9 @@ if sys.version_info >= (3, 12) and sys.platform == "linux":
     CLONE_VM: int
     def unshare(flags: int) -> None: ...
     def setns(fd: FileDescriptorLike, nstype: int = 0) -> None: ...
+
+if sys.version_info >= (3, 13) and sys.platform != "win32":
+    def posix_openpt(oflag: int, /) -> int: ...
+    def grantpt(fd: FileDescriptorLike, /) -> None: ...
+    def unlockpt(fd: FileDescriptorLike, /) -> None: ...
+    def ptsname(fd: FileDescriptorLike, /) -> str: ...

stdlib/posix.pyi

@@ -236,6 +236,9 @@ if sys.platform != "win32":
     if sys.version_info >= (3, 11):
         from os import login_tty as login_tty
 
+    if sys.version_info >= (3, 13):
+        from os import grantpt as grantpt, posix_openpt as posix_openpt, ptsname as ptsname, unlockpt as unlockpt
+
     if sys.platform != "linux":
         from os import chflags as chflags, lchflags as lchflags, lchmod as lchmod