From b1930bf75f276cd7ca08c4455298128d89adf7d1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jakub=20Kul=C3=ADk?= <Kulikjak@gmail.com>
Date: Tue, 17 Aug 2021 20:09:48 +0200
Subject: [PATCH] bpo-44935: enable posix_spawn() on Solaris (GH-27795)

Enable posix_spawn() on Solaris
---
 Lib/subprocess.py                                            | 5 +++--
 .../next/Library/2021-08-17-16-01-44.bpo-44935.roUl0G.rst    | 2 ++
 2 files changed, 5 insertions(+), 2 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Library/2021-08-17-16-01-44.bpo-44935.roUl0G.rst

diff --git a/Lib/subprocess.py b/Lib/subprocess.py
index 7a9ab5a4ed0..dd1174ee59a 100644
--- a/Lib/subprocess.py
+++ b/Lib/subprocess.py
@@ -660,8 +660,9 @@ def _use_posix_spawn():
         # os.posix_spawn() is not available
         return False
 
-    if sys.platform == 'darwin':
-        # posix_spawn() is a syscall on macOS and properly reports errors
+    if sys.platform in ('darwin', 'sunos5'):
+        # posix_spawn() is a syscall on both macOS and Solaris,
+        # and properly reports errors
         return True
 
     # Check libc name and runtime libc version
diff --git a/Misc/NEWS.d/next/Library/2021-08-17-16-01-44.bpo-44935.roUl0G.rst b/Misc/NEWS.d/next/Library/2021-08-17-16-01-44.bpo-44935.roUl0G.rst
new file mode 100644
index 00000000000..3d41c3be140
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2021-08-17-16-01-44.bpo-44935.roUl0G.rst
@@ -0,0 +1,2 @@
+:mod:`subprocess` on Solaris now also uses :func:`os.posix_spawn()` for
+better performance.