[3.15] gh-154226: Fix test_posix_pty_functions on Solaris (GH-154230) (GH-154241)

https://github.com/python/cpython/commit/b05ed78a8a97208c862b004ced8bfc824838e9d3
commit: b05ed78a8a97208c862b004ced8bfc824838e9d3
branch: 3.15
author: Miss Islington (bot) <[email protected]>
committer: serhiy-storchaka <[email protected]>
date: 2026-07-20T12:36:17+03:00
summary:

[3.15] gh-154226: Fix test_posix_pty_functions on Solaris (GH-154230) (GH-154241)

(cherry picked from commit 3d998611a48b45691894c687ac0ec52b54df52bf)

Co-authored-by: Serhiy Storchaka <[email protected]>
Co-authored-by: Claude Fable 5 <[email protected]>

files:
M Lib/test/test_os/test_os.py

diff --git a/Lib/test/test_os/test_os.py b/Lib/test/test_os/test_os.py
index 279c9ac804f6be..f2b9cf75d3bfa1 100644
--- a/Lib/test/test_os/test_os.py
+++ b/Lib/test/test_os/test_os.py
@@ -4715,6 +4715,13 @@ def test_posix_pty_functions(self):
         son_path = os.ptsname(mother_fd)
         son_fd = os.open(son_path, os.O_RDWR|os.O_NOCTTY)
         self.addCleanup(os.close, son_fd)
+        if sys.platform.startswith('sunos'):
+            # The slave is not a terminal until these STREAMS modules
+            # are pushed onto it.
+            import fcntl
+            I_PUSH = 0x5302
+            fcntl.ioctl(son_fd, I_PUSH, b'ptem\0')
+            fcntl.ioctl(son_fd, I_PUSH, b'ldterm\0')
         self.assertEqual(os.ptsname(mother_fd), os.ttyname(son_fd))
 
     @warnings_helper.ignore_fork_in_thread_deprecation_warnings()

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