gh-154227: Fix os.posix_openpt() on OpenBSD (GH-154228)

serhiy-storchaka · claude · web-flow · commit d01b90cf33f8 · 2026-07-20T08:48:14.000Z
Co-Authored-By: Claude Fable 5 &lt;noreply@anthropic.com&gt;
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
@@ -9186,7 +9186,9 @@ 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
`@@ -9186,7 +9186,9 @@ os_posix_openpt_impl(PyObject *module, int oflag)`
`9186`	`9186`	`{`
`9187`	`9187`	`int fd;`
`9188`	`9188`
`9189`		`-#if defined(O_CLOEXEC)`
	`9189`	`+ // OpenBSD posix_openpt() rejects any flag other than O_RDWR and`
	`9190`	`+ // O_NOCTTY; the fd is made non-inheritable below in any case.`
	`9191`	`+#if defined(O_CLOEXEC) && !defined(__OpenBSD__)`
`9190`	`9192`	`oflag \|= O_CLOEXEC;`
`9191`	`9193`	`#endif`
`9192`	`9194`