[3.13] gh-154227: Fix os.posix_openpt() on OpenBSD (GH-154228) (GH-154237)

miss-islington · serhiy-storchaka · claude · web-flow · commit 3d20955a0bb2 · 2026-07-20T12:43:25.000+03:00
(cherry picked from commit d01b90c) Co-authored-by: Serhiy Storchaka <storchaka@gmail.com> Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
diff --git a/Misc/NEWS.d/next/Library/2026-07-20-14-00-00.gh-issue-154227.openpt.rst b/Misc/NEWS.d/next/Library/2026-07-20-14-00-00.gh-issue-154227.openpt.rst
@@ -0,0 +1,2 @@
+Fix :func:`os.posix_openpt` on OpenBSD, where it rejected the
+:data:`~os.O_CLOEXEC` flag.
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
@@ -8618,7 +8618,9 @@ os_posix_openpt_impl(PyObject *module, int oflag)
 {
     int fd;
 
-#if defined(O_CLOEXEC)
+    // OpenBSD posix_openpt() rejects any flag other than O_RDWR and
+    // O_NOCTTY; the fd is made non-inheritable below in any case.
+#if defined(O_CLOEXEC) && !defined(__OpenBSD__)
     oflag |= O_CLOEXEC;
 #endif
 

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	+Fix :func:`os.posix_openpt` on OpenBSD, where it rejected the
	`2`	+:data:`~os.O_CLOEXEC` flag.
Original file line number	Diff line number	Diff line change
`@@ -8618,7 +8618,9 @@ os_posix_openpt_impl(PyObject *module, int oflag)`
`8618`	`8618`	`{`
`8619`	`8619`	`int fd;`
`8620`	`8620`
`8621`		`-#if defined(O_CLOEXEC)`
	`8621`	`+ // OpenBSD posix_openpt() rejects any flag other than O_RDWR and`
	`8622`	`+ // O_NOCTTY; the fd is made non-inheritable below in any case.`
	`8623`	`+#if defined(O_CLOEXEC) && !defined(__OpenBSD__)`
`8622`	`8624`	`oflag \|= O_CLOEXEC;`
`8623`	`8625`	`#endif`
`8624`	`8626`